Agilent HFBR-0400, HFBR-14xx and
HFBR-24xx Series Low Cost, Miniature
Fiber Optic Components with ST®,
SMA, SC and FC Ports
Data Sheet
Description
The HFBR-0400 Series of
components is designed to
provide cost effective, high
performance fiber optic
communication links for
information systems and
industrial applications with link
distances of up to 2.7
kilometers. With the HFBR-24x6,
the 125 MHz analog receiver,
data rates of up to 160
megabaud are attainable.
Transmitters and receivers are
directly compatible with popular
“industry-standard” connectors:
ST®, SMA, SC and FC. They are
completely specified with
multiple fiber sizes; including
50/125 µm, 62.5/125 µm, 100/
140 µm, and 200 µm.
The HFBR-14x4 high power
transmitter and HFBR-24x6 125
MHz receiver pair up to provide
a duplex solution optimized for
100 Base-SX. 100Base-SX is a
Fast Ethernet Standard (100
Mbps) at 850 nm on multimode
fiber.
Complete evaluation kits are
available for ST product
offerings; including transmitter,
receiver, connectored cable, and
technical literature. In addition,
ST connectored cables are
available for evaluation.
Features
•Meets IEEE 802.3 Ethernet and
802.5 Token Ring Standards
•Meets TIA/EIA-785 100Base-SX
standard
•Low Cost Transmitters and
Receivers
•Choice of ST®, SMA, SC or FC
Ports
•820 nm Wavelength Technology
•Signal Rates up to 160 MBd
•Link Distances up to 2.7 km
•Specified with 50/125 µm, 62.5/
125 µm, 100/140 µm, and 200 µm
HCS® Fiber
•Repeatable ST Connections within
0.2 dB Typical
•Unique Optical Port Design for
Efficient Coupling
•Auto-Insertable and Wave
Solderable
•No Board Mounting Hardware
Required
•Wide Operating Temperature
Range -40 °C to +85 °C
•AlGaAs Emitters 100% Burn-In
Ensures High Reliability
•Conductive Port Option
Applications
•100Base-SX Fast Ethernet on 850
nm
•Media/fiber conversion, switches,
routers, hubs and NICs on
100Base-SX
•Local Area Networks
•Computer to Peripheral Links
•Computer Monitor Links
•Digital Cross Connect Links
•Central Office Switch/PBX Links
•Video Links
•Modems and Multiplexers
•Suitable for Tempest Systems
•Industrial Control Links
ST® is a registered trademark of AT&T.
HCS® is a registered trademark of the SpecTran Corporation.
2
HFBR-0400 Series Part Number Guide
Available Options
Link Selection Guide
For additional information on specific links see the following individual link descriptions. Distances measured over temperature range from 0 to +70 °C.
HFBR-x4xxaa
1Transmitter
2Receiver
4 820 nm Transmitter and Receiver
products
0SMA, housed
1ST, housed
2FC, housed
ESC, housed
T Threaded port option
C Conductive port receiver option
M Metal port option
2TX, stadnard power
4 TX, high power
2RX, 5 MBd, TTL output
5 TX, high light output power
6 RX, 125 MHz, Analog Output
HFBR-1402 HFBR-1414 HFBR-1412TM HFBR-2412TC HFBR-2412T HFBR-2416TC
HFBR-1404 HFBR-1414M HFBR-14E4 HFBR-2416 HFBR-2422
HFBR-1412 HFBR-1414T HFBR-2402 HFBR-2416M HFBR-24E6
HFBR-1412T HFBR-1424 HFBR-2406 HFBR-2412 HFBR-2416T
Data rate (MBd) Distance (m) Transmitter Receiver Fiber Size (µm) Evaluation Kit
5 1500 HFBR-14x2 HFBR-24x2 200 HCS N/A
5 2000 HFBR-14x4 HFBR-24x2 62.5/125 HFBR-0410
20 2700 HFBR-14x4 HFBR-24x6 62.5/125 HFBR-0414
32 2200 HFBR-14x4 HFBR-24x6 62.5/125 HFBR-0414
55 1400 HFBR-14x4 HFBR-24x6 62.5/125 HFBR-0414
125 700 HFBR-14x4 HFBR-24x6 62.5/125 HFBR-0416
155 600 HFBR-14x4 HFBR-24x6 62.5/125 HFBR-0416
160 500 HFBR-14x4 HFBR-24x6 62.5/125 HFBR-0416
3
Applications Support Guide
This section gives the designer
information necessary to use the
HFBR-0400 series components
to make a functional fiber optic
transceiver.
Agilent offers a wide selection of
evaluation kits for hands-on
experience with fiber optic
products as well as a wide range
of application notes complete
with circuit diagrams and board
layouts.
Furthermore, Agilent’s
application support group is
always ready to assist with any
design consideration.
Application Literature
Title Description
HFBR-0400 Series Reliability Data Transmitter & Receiver Reliability Data
Application Bulletin 78 Low Cost Fiber Optic Links for Digital Applications up to 155 MBd
Application Note 1038 Complete Fiber Solutions for IEEE 802.3 FOIRL, 10Base-FB and 10Base-FL
Application Note 1065 Complete Solutions for IEEE 802.5J Fiberoptic Token Ring
Application Note 1073 HFBR-0219 Test Fixture for 1x9 Fiber Optic Transceivers
Application Note 1086 Optical Fiber Interconnections in Telecommunication Products
Application Note 1121 DC to 32 MBd Fiberoptic Solutions
Application Note 1122 2 to 70 MBd Fiberoptic Solutions
Application Note 1123 20 to 160 MBd Fiberoptic Solutions
Application Note 1137 Generic Printed Circuit Layout Rules
Application Note 1383 Cost Effective Fiber and Media Conversion for 100Base-SX
4
HFBR-0400 Series Evaluation Kits
HFBR-0410 ST Evaluation Kit
Contains the following:
•One HFBR-1412 transmitter
•One HFBR-2412 five
megabaud TTL receiver
•Three meters of ST
connectored 62.5/125 µm
fiber optic cable with low cost
plastic ferrules.
•Related literature
HFBR-0414 ST Evaluation Kit
Includes additional components
to interface to the transmitter
and receiver as well as the PCB
to reduce design time. Contains
the following:
•One HFBR-1414T transmitter
•One HFBR-2416T receiver
•Three meters of ST
connectored 62.5/125 µm
fiber optic cable
•Printed circuit board
•ML-4622 CP Data Quantizer
•74ACTllOOON LED Driver
•LT1016CN8 Comparator
•4.7 µH Inductor
•Related literature
HFBR-0400 SMA Evaluation Kit
Contains the following:
•One HFBR-1402 transmitter
•One HFBR-2402 five
megabaud TTL receiver
•Two meters of SMA
connectored 1000 µm plastic
optical fiber
•Related literature
HFBR-0416 Evaluation Kit
Contains the following:
•One fully assembled 1x9
transceiver board for 155
MBd evaluation including:
- HFBR-1414 transmitter
- HFBR-2416 receiver
- circuitry
•Related literature
Package and Handling Information
Package Information
All HFBR-0400 Series
transmitters and receivers are
housed in a low-cost, dual-inline
package that is made of high
strength, heat resistant,
chemically resistant, and UL
94V-O flame retardant ULTEM®
plastic (UL File #E121562). The
transmitters are easily identified
by the light grey color connector
port. The receivers are easily
identified by the dark grey color
connector port. (Black color for
conductive port). The package is
designed for auto-insertion and
wave soldering so it is ideal for
high volume production
applications.
Handling and Design Information
Each part comes with a
protective port cap or plug
covering the optics. These caps/
plugs will vary by port style.
When soldering, it is advisable
to leave the protective cap on
the unit to keep the optics clean.
Good system performance
requires clean port optics and
cable ferrules to avoid
obstructing the optical path.
Clean compressed air often is
sufficient to remove particles of
dirt; methanol on a cotton swab
also works well.
Recommended Chemicals for
Cleaning/Degreasing HFBR-0400
Products
Alcohols: methyl, isopropyl,
isobutyl.
Aliphatics: hexane, heptane,
Other: soap solution, naphtha.
Do not use partially halogenated
hydrocarbons such as 1,1.1
trichloroethane, ketones such as
MEK, acetone, chloroform, ethyl
acetate, methylene dichloride,
phenol, methylene chloride, or
N-methylpyrolldone. Also,
Agilent does not recommend the
use of cleaners that use
halogenated hydrocarbons
because of their potential
environmental harm.
Ultem® is a registered Trademark of the GE corporation.
5
Mechanical Dimensions
SMA Port
HFBR-x40x
Mechanical Dimensions
ST Port
HFBR-x41x
6.35
(0.25)
2.54
(0.10)
3.81
(0.15)
6.4
(0.25) DIA.
12.7
(0.50)
12.7
(0.50)
22.2
(0.87)
5.1
(0.20)
10.2
(0.40)
3.6
(0.14)
1.27
(0.05)
2.54
(0.10)
PINS 1,4,5,8
0.51 X 0.38
(0.020 X 0.015)
PINS 2,3,6,7
0.46
(0.018) DIA.
8
13
5
24
6
7
PIN NO. 1
INDICATOR
1/4 - 36 UNS 2A THREAD
Rx/Tx
COUNTRY OF
ORIGIN
A YYWW
HFBR-X40X
8.2
(0.32)
Rx/Tx
COUNTRY OF
ORIGIN
A YYWW
HFBR-X41X
6.35
(0.25)
12.7
(0.50)
27.2
(1.07)
5.1
(0.20)
10.2
(0.40)
3.6
(0.14)
1.27
(0.05)
2.54
(0.10)
PINS 1,4,5,8
0.51 X 0.38
(0.020 X 0.015)
PINS 2,3,6,7
0.46
(0.018) DIA.
8
13
5
24
6
7
PIN NO. 1
INDICATOR
2.54
(0.10)
3.81
(0.15)
DIA.
12.7
(0.50)
7.0
(0.28)
6
Mechanical Dimensions
Threaded ST Port
HFBR-x41xT
Mechanical Dimensions
FC Port
HFBR-x42x
5.1
(0.20)
3/8 - 32 UNEF - 2A
Rx/Tx
COUNTRY OF
ORIGIN
A YYWW
HFBR-X41XT
8.4
(0.33)
6.35
(0.25)
12.7
(0.50)
27.2
(1.07)
5.1
(0.20)
10.2
(0.40)
3.6
(0.14)
1.27
(0.05)
2.54
(0.10)
PINS 1,4,5,8
0.51 X 0.38
(0.020 X 0.015)
PINS 2,3,6,7
0.46
(0.018) DIA.
8
13
5
24
6
7
PIN NO. 1
INDICATOR
2.54
(0.10)
3.81
(0.15)
DIA.
12.7
(0.50)
7.1
(0.28)
DIA.
7.6
(0.30)
M8 x 0.75 6G
THREAD (METRIC)
Rx/Tx
COUNTRY OF
ORIGIN
A YYWW
HFBR-X42X
2.5
(0.10)
3.81
(0.15)
7.9
(0.31)
12.7
(0.50)
12.7
(0.50)
5.1
(0.20)
10.2
(0.40)
3.6
(0.14)
8
13
5
24
6
7
PIN NO. 1
INDICATOR
19.6
(0.77)
2.5
(0.10)
7
Mechanical Dimensions
SC Port
HFBR-x4Ex
28.65
(1.128)
15.95
(0.628)
10.0
(0.394)
12.7
(0.500)
Rx/Tx
COUNTRY OF
ORIGIN
A YYWW
HFBR-X4EX
12.7
(0.50)
2.54
(0.10)
3.81
(0.15)
6.35
(0.25)
5.1
(0.200)
10.38
(0.409)
3.60
(0.140)
1.27
(0.050)
2.54
(0.100)
8
Figure 1. HFBR-0400 ST Series Cross-Sectional View.
Panel Mount Hardware
Port Cap Hardware
HFBR-4402: 500 SMA Port Caps
HFBR-4120: 500 ST Port Plugs (120 psi)
HOUSING
CONNECTOR PORT
HEADER
EPOXY BACKFILL
PORT GROUNDING PATH INSERT
LED OR DETECTOR IC
LENS–SPHERE
(ON TRANSMITTERS ONLY)
LENS–WINDOW
(Each HFBR-4401 and HFBR-4411 kit consists of 100 nuts and 100 washers).
7.87
(0.310)
7.87
(0.310) DIA.
1/4 - 36 UNEF -
2B THREAD
1.65
(0.065)
TYP.
DIA.
6.61
(0.260) DIA.
HEX-NUT
WASHER
0.14
(0.005)
14.27
(0.563)
12.70
(0.50) DIA.
3/8 - 32 UNEF -
2B THREAD
1.65
(0.065)
TYP.
DIA.
10.41
(0.410)
MAX.
DIA.
HEX-NUT
WASHER
0.46
(0.018)
3/8 - 32 UNEF -
2A THREADING
0.2 IN.
WALL
WASHER
NUT
1 THREAD
AVAILABLE
DATE CODE
PART
NUMBER
Rx/Tx
COUNTRY OF
ORIGIN
A YYWW
HFBR-X40X
HFBR-4401: for SMA Ports HFBR-4411: for ST Ports
9
Options
In addition to the various port
styles available for the HFBR-
0400 series products, there are
also several extra options that
can be ordered. To order an
option, simply place the
corresponding option number at
the end of the part number. See
page 2 for available options.
Option T (Threaded Port Option)
•Allows ST style port
components to be panel
mounted.
•Compatible with all current
makes of ST® multimode
connectors
•Mechanical dimensions are
compliant with MIL-STD-
83522/13
•Maximum wall thickness
when using nuts and washers
from the HFBR-4411
hardware kit is 2.8 mm (0.11
inch)
•Available on all ST ports
Option C (Conductive Port Receiver
Option)
•Designed to withstand
electrostatic discharge (ESD)
of 25 kV to the port
•Significantly reduces effect of
electromagnetic interference
(EMI) on receiver sensitivity
•Allows designer to separate
the signal and conductive port
grounds
•Recommended for use in
noisy environments
•Available on SMA and
threaded ST port style
receivers only
Option M (Metal Port Option)
•Nickel plated aluminum
connector receptacle
•Designed to withstand
electrostatic discharge (ESD)
of 15 kV to the port
•Significantly reduces effect of
electromagnetic interference
(EMI) on receiver sensitivity
•Allows designer to separate
the signal and metal port
grounds
•Recommended for use in very
noisy environments
•Available on SMA, ST, and
threaded ST ports
10
Typical Link Data
HFBR-0400 Series
Description
The following technical data is
taken from 4 popular links using
the HFBR-0400 series: the 5
MBd link, Ethernet 20 MBd link,
Token Ring 32 MBd link, and the
corresponds to transceiver
solutions combining the HFBR-
0400 series components and
various recommended
transceiver design circuits using
off-the-shelf electrical
components. This data is meant
to be regarded as an example of
typical link performance for a
given design and does not call
out any link limitations. Please
refer to the appropriate
application note given for each
link to obtain more information.
Parameter Symbol Min. Typ. Max. Units Conditions Reference
Optical Power Budget
with 50/125 µm fiber
OPB50 4.2 9.6 dB HFBR-14x4/24x2
NA = 0.2
Note 1
Optical Power Budget
with 62.5/125 µm fiber
OPB62.5 8.0 15 dB HFBR-14x4/24x2
NA = 0.27
Note 1
Optical Power Budget
with 100/140 µm fiber
OPB100 8.0 15 dB HFBR-14x2/24x2
NA = 0.30
Note 1
Optical Power Budget
with 200 µm fiber
OPB200 12 20 dB HFBR-14x2/24x2
NA = 0.37
Note 1
Date Rate Synchronous dc 5 MBd Note 2
Asynchronous dc 2.5 MBd Note 3,
Fig 7
Propagation Delay
LOW to HIGH
tPLH 72 ns TA = +25 °C
PR = -21 dBm peak
Fiber cable length = 1 m
Figs 6, 7, 8
Propagation Delay
HIGH to LOW
tPHL 46 ns
System Pulse Width
Distortion
tPLH - tPHL 26 ns
Bit Error Rate BER 10-9 Data rate <5 Bd
PR > -24 dBm peak
Notes:
1. OPB at TA = -40 to +85 °C, VCC = 5.0 V dc, IF ON = 60 mA. PR = -24 dBm peak.
2. Synchronous data rate limit is based on these assumptions: a) 50% duty factor modulation, e.g., Manchester I or BiPhase Manchester II; b)
continuous data; c) PLL Phase Lock Loop demodulation; d) TTL threshold.
3. Asynchronous data rate limit is based on these assumptions: a) NRZ data; b) arbitrary timing-no duty factor restriction; c) TTL threshold.
5 MBd Link (HFBR-14xx/24x2)
Link Performance -40 °C to +85 °C unless otherwise specified
11
5 MBd Logic Link Design
If resistor R1 in Figure 2 is 70.4
W, a forward current IF of 48 mA
is applied to the HFBR-14x4
LED transmitter. With IF = 48
mA the HFBR-14x4/24x2 logic
link is guaranteed to work with
62.5/125 µm fiber optic cable
over the entire range of 0 to
1750 meters at a data rate of dc
to 5 MBd, with arbitrary data
format and pulse width
distortion typically less than
25%. By setting R1 = 115 W, the
transmitter can be driven with
IF = 30 mA, if it is desired to
economize on power or achieve
lower pulse distortion.
The following example will
illustrate the technique for
selecting the appropriate value
of IF and R1.
Maximum distance required =
400 meters. From Figure 3 the
drive current should be 15 mA.
From the transmitter data VF =
1.5 V (max.) at IF = 15 mA as
shown in Figure 9.
The curves in Figures 3, 4, and 5
are constructed assuming no
inline splice or any additional
system loss. Should the link
consists of any in-line splices,
these curves can still be used to
calculate link limits provided
they are shifted by the
additional system loss expressed
in dB. For example, Figure 3
indicates that with 48 mA of
transmitter drive current, a 1.75
km link distance is achievable
with 62.5/125 µm fiber which
has a maximum attenuation of 4
dB/km. With 2 dB of additional
system loss, a 1.25 km link
distance is still achievable.
Figure 2. Typical Circuit Configuration.
Ω=
−=−=
233 R
mA 15I
1.5V5VVVR
1
F
FCC1
+5 V SELECT R1 TO SET IF
R1
IF
1 KΩ
DATA IN
½ 75451
2
6
7
3
T
HFBR-14xx
TRANSMITTER
TRANSMISSION
DISTANCE =
HFBR-24x2
RECEIVER
R
TTL DATA OUT
2
6
7 & 3
RL
VCC
0.1 µF
NOTE:
IT IS ESSENTIAL THAT A BYPASS CAPACITOR (0.01 µF TO 0.1 µF
CERAMIC) BE CONNECTED FROM PIN 2 TO PIN 7 OF THE RECEIVER.
TOTAL LEAD LENGTH BETWEEN BOTH ENDS OF THE CAPACITOR
AND THE PINS SHOULD NOT EXCEED 20 MM.
12
Figure 3. HFBR-1414/HFBR-2412 Link Design
Limits with 62.5/125 µm Cable.
Figure 4. HFBR-14x2/HFBR-24x2 Link Design
Limits with 100/140 µm Cable.
Figure 5. HFBR-14x4/HFBR-24x2 Link Design
Limits with 50/125 µm Cable.
Figure 6. Propagation Delay through System
with One Meter of Cable.
Figure 7. Typical Distortion of Pseudo Random
Data at 5 Mb/s.
Figure 8. System Propagation Delay Test Circuit and Waveform Timing Definitions.
10LOG(I/Io) NORMALIZED TRANSMITTER CURREN
T
(dB)
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
I
F
TRANSMITTER FORWARD CURRENT (mA)
60
50
40
30
20
10
6
420
LINK LENGTH (km)
CABLE ATTENUATION
MAX (-40 ˚C, +85 ˚C)
MIN (-40 ˚C, +85 ˚C)
TYP (+25 ˚C)
dB/km
4
1.5
2.8
OVERDRIVE WORST CASE
-40 ˚C, +85 ˚C
UNDERDRIVE
TYPICAL +25 ˚C
UNDERDRIVE
10LOG(I/Io) NORMALIZED TRANSMITTER CURREN
T
(dB)
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
I
F
TRANSMITTER FORWARD CURRENT (mA)
60
50
40
30
20
10
6
420
LINK LENGTH (km)
CABLE ATTENUATION
MAX (-40 ˚C, +85 ˚C)
MIN (-40 ˚C, +85 ˚C)
TYP (+25 ˚C)
dB/km
5.5
1.0
3.3
OVERDRIVE
WORST CASE
-40 ˚C, +85 ˚C
UNDERDRIVE
TYPICAL +25 ˚C
UNDERDRIVE
13
0
-1
-2
-3
-4
-5
-6 0 0.4 0.8 1.2 1.6 2
10 LOG (t/to) NORMALIZED TRANSMITTER CURRENT (dB)
LINK LENGTH (km)
I
F
– TRANSMITTER FORWARD CURRENT – (mA)
60
50
40
30
20
WORST CASE
-40˚C, +85˚C
UNDERDRIVE
CABLE ATTENUATION dB/km
α MAX (-40˚C, +85˚C) 4
α MIN (-40˚C, +85˚C) 1
α TYP (-40˚C, +85˚C) 2.8
TYPICAL 26˚C
UNDERDRIVE
75
-22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12
P
R
– RECEIVER POWER – dBm
tPLH OR t PHL PROPOGATION DELAY –ns
70
65
60
55
50
45
40
35
30
25
20
t
PLH
(TYP) @ 25˚C
t
PHL
(TYP) @ 25˚C
55
-22 -21 -20 -19 -18 -17 -16 -15 -14 -13 -12
P
R
– RECEIVER POWER – dBm
t
D
– NRZ DISTORTION – ns
50
45
40
35
30
25
20
IF 10 W
PULSE
GEN
½ 75451 1N4150
10 W
+15 V
RS
2, 6, 7
RESISTOR VALUE AS NEEDED FOR
SETTING OPTICAL POWER OUTPUT
FROM RECEIVER END OF TEST CABLE
3
TRANSMITTER
PT - FROM 1-METER
TEST CABLE
INPUT (IF)
2
6
7 & 3
+VO
15 pF
RL
+5 V
560
0.1 µF
OUTPUT
TIMING
ANALYSIS
EQUIPMENT
eg. SCOPE
HFBR-2412 RECEIVER
INPUT
IF
PT
VO
50%
50%
tPHL
MAX
5 V
1.5 V
0
tPHLT
100 ns
tPHL
MIN
PULSE REPETITION
FREQ = 1 MHz
100 ns
tPHLT
tPHL
MAX
tPHL
MIN
13
Ethernet 20 MBd Link (HFBR-14x4/24x6)
(refer to Application Note 1038 for details)
Typical Link Performance
Notes:
1. Typical data at TA = +25 °C, VCC = 5.0 V dc.
2. Typical performance of circuits shown in Figure 1 and Figure 3 of AN-1038 (see applications support section).
Token Ring 32 MBd Link (HFBR-14x4/24x6)
(refer to Application Note 1065 for details)
Typical Link Performance
Notes:
1. Typical data at TA = +25 °C, VCC = 5.0 V dc.
2. Typical performance of circuits shown in Figure 1 and Figure 3 of AN-1065 (see applications support section)
Parameter Symbol Typ [1, 2] Units Conditions
Receiver Sensitivity -34.4 dBm average 20 MBd D2D2 hexadecimal data
2 km 62.5/125 µm fiber
Link Jitter 7.56
7.03
ns pk-pk
ns pk-pk
ECL Out Receiver
TTL Out Receiver
Transmitter Jitter 0.763 ns pk-pk 20 MBd D2D2 hexadecimal data
Optical Power PT-15.2 dBm average 20 MBd D2D2 hexadecimal data
Peak IF,ON = 60 mA
LED Rise Time tr1.30 ns 1 MHz square wave input
LED Fall Time tf3.08 ns
Mean Difference |tr - tf|1.77 ns
Bit Error Rate BER 10-10
Output Eye Opening 36.7 ns At AUI receiver output
Data Format 50% Duty Factor 20 MBd
Parameter Symbol Typ [1, 2] Units Conditions
Receiver Sensitivity -34.1 dBm average 32 MBd D2D2 hexadecimal data
2 km 62.5/125 µm fiber
Link Jitter 6.91
5.52
ns pk-pk
ns pk-pk
ECL Out Receiver
TTL Out Receiver
Transmitter Jitter 0.823 ns pk-pk 32 MBd D2D2 hexadecimal data
Optical Power Logic Level "0" PT ON -12.2 dBm peak Transmitter TTL in IF ON = 60 mA,
IF OFF = 1 mA
Optical Power Logic Level "1" PT OFF -82.2
LED Rise Time tr1.3 ns 1 MHz square wave input
LED Fall Time tf3.08 ns
Mean Difference |tr - tf|1.77 ns
Bit Error Rate BER 10-10
Data Format 50% Duty Factor 32 MBd
14
155 MBd Link (HFBR-14x4/24x6)
(refer to Application Bulletin 78 for details)
Typical Link Performance
Notes:
1. Typical data at TA = +25 °C, VCC = 5.0 V dc, PECL serial interface.
2. Typical OPB was determined at a probability of error (BER) of 10-9. Lower probabilities of error can be achieved with short fibers that have less
optical loss.
Parameter Symbol Min Typ [1, 2] Max Units Conditions Ref
Optical Power Budget with
50/125 µm fiber
OPB50 7.9 13.9 dB NA = 0.2 Note 2
Optical Power Budget with
62.5/125 µm fiber
OPB62 11.7 17.7 dB NA = 0.27
Optical Power Budget with
100/140 µm fiber
OPB100 11.7 17.7 dB NA = 0.30
Optical Power Budget with
200 µm HCS fiber
OPB200 16.0 22.0 dB NA = 0.35
Data Format 20% to 80% Duty
Factor
1 175 MBd
System Pulse Width Distortion |tPLH - tPHL| 1 ns PR = -7 dBm peak
1 m 62.5/125 µm fiber
Bit Error Rate BER 10-9 Data rate < 100 MBaud
PR > -31 dBm peak
Note 2
15
HFBR-14x2/14x4 Low-Cost High-
Speed Transmitters
Description
The HFBR-14xx fiber optic
transmitter contains an 820 nm
AlGaAs emitter capable of
efficiently launching optical
power into four different optical
fiber sizes: 50/125 µm, 62.5/125
µm, 100/140 µm, and 200 µm
HCS®. This allows the designer
flexibility in choosing the fiber
size. The HFBR-14xx is designed
to operate with the Agilent
HFBR-24xx fiber optic receivers.
The HFBR-14xx transmitter’s
high coupling efficiency allows
the emitter to be driven at low
current levels resulting in low
power consumption and
increased reliability of the
transmitter. The HFBR-14x4
high power transmitter is
optimized for small size fiber
and typically can launch -15.8
dBm optical power at 60 mA
into 50/125 µm fiber and -12
dBm into 62.5/125 µm fiber. The
HFBR-14x2 standard
transmitter typically can launch
-12 dBm of optical power at 60
mA into 100/140 µm fiber cable.
It is ideal for large size fiber
such as 100/140 µm. The high
launched optical power level is
useful for systems where star
couplers, taps, or inline
connectors create large fixed
losses.
Consistent coupling efficiency is
assured by the double-lens
optical system (Figure 1). Power
coupled into any of the three
fiber types varies less than 5 dB
from part to part at a given drive
current and temperature.
Consistent coupling efficiency
reduces receiver dynamic range
requirements which allows for
longer link lengths.
Housed Product
Unhoused Product
Absolute Maximum Ratings
Parameter Symbol Min Max Units Reference
Storage Temperature TS-55 +85 °C
Operating
Te m p er a t u r e
TA-40 +85 °C
Lead Soldering Cycle
Temp
Time
+260
10
°C
sec
Forward Input Current
Peak
dc
IFPK
IFdc
200
100
mA
V
Note 1
Reverse Input Voltage VBR 1.8 V
NOTES:
1. PINS 1, 4, 5 AND 8
ARE ELECTICALLY
CONNECTED.
2. PINS 2, 6 AND 7 ARE
ELECTRICALLY CONNECTED
TO THE HEADER.
ANODE
CATHODE
2, 6, 7
3
PIN
11
2
32
41
51
6
72
81
FUNCTION
NC
ANODE
CATHODE
NC
NC
ANODE
ANODE
NC
4
3
2
1
5
6
7
8
PIN 1 INDICATOR
BOTTOM VIEW
12
34
BOTTOM VIEW
PIN
1
2
3
4
FUNCTION
ANODE
CATHODE
ANODE
ANODE
16
Electrical/Optical Specifications -40 °C to +85 °C unless otherwise specified.
HFBR-14x2 Output Power Measured Out of 1 Meter of Cable
Parameter Symbol Min Typ2Max Units Conditions Reference
Forward Voltage VF1.48 1.70
1.84
2.09 V IF = 60 mA dc
IF = 100 mA dc
Figure 9
Forward Voltage Temperature Coefficient DVF/DT-0.22
-0.18
mV/°C IF = 60 mA dc
IF = 100 mA dc
Figure 9
Reverse Input Voltage VBR 1.8 3.8 V IF = 100 µA dc
Peak Emission Wavelength lP792 820 865 nm
Diode Capacitance CT55 pF V = 0, f = 1 MHz
Optical Power Temperature Coefficient DPT/DT-0.006
-0.010
dB/°C I = 60 mA dc
I = 100 mA dc
Thermal Resistance qJA 260 °C/W Notes 3, 8
14x2 Numerical Aperture NA 0.49
14x4 Numerical Aperture NA 0.31
14x2 Optical Port Diameter D 290 µm Note 4
14x4 Optical Port Diameter D 150 µm Note 4
Parameter Symbol Min Typ2Max Units Conditions Reference
50/125 µm Fiber Cable
NA = 0.2
PT50 -21.8
-22.8
-20.3
-21.9
-18.8
-16.8
-16.8
-15.8
-14.4
-13.8
dBm peak TA = +25 °C, IF = 60mA dc
TA = +25 °C, IF = 100 mA dc
Notes 5, 6, 9
62.5/125 µm Fiber Cable
NA = 0.275
PT62 -19.0
-20.0
-17.5
-19.1
-16.0
-14.0
-14.0
-13.0
-11.6
-11.0
dBm peak TA = +25 °C, IF = 60mA dc
TA = +25 °C, IF = 100 mA dc
100/140 µm Fiber Cable
NA = 0.3
PT100 -15.0
16.0
-13.5
-15.1
-12.0
-10.0
-10.0
-9.0
-7.6
-7.0
dBm peak TA = +25 °C, IF = 60mA dc
TA = +25 °C, IF = 100 mA dc
200 µm HCS Fiber Cable
NA - 0.37
PT200 -10.7
-11.7
-9.2
-10.8
-7.1
-5.2
-4.7
-3.7
-2.3
-1.7
dBm peak TA = +25 °C, IF = 60mA dc
TA = +25 °C, IF = 100 mA dc
CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to damage
from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of these
components to prevent damage and/or degradation which may be induced by ESD.
17
HFBR-14x4 Output Power Measured out of 1 Meter of Cable
HFBR-14x5 Output Power Measured out of 1 Meter of Cable
14x2/14x4 Dynamic Characteristics
Notes:
1. For IFPK > 100 mA, the time duration should not exceed 2 ns.
2. Typical data at TA = +25 °C.
3. Thermal resistance is measured with the transmitter coupled to a connector assembly and mounted on a printed circuit board.
4. D is measured at the plane of the fiber face and defines a diameter where the optical power density is within 10 dB of the maximum.
5. PT is measured with a large area detector at the end of 1 meter of mode stripped cable, with an ST® precision ceramic ferrule (MILSTD- 83522/13)
for HFBR-1412/1414, and with an SMA 905 precision ceramic ferrule for HFBR-1402/1404.
6. When changing mW to dBm, the optical power is referenced to 1 mW (1000 mW). Optical Power P (dBm) = 10 log P (mW)/1000 mW.
7. Pre-bias is recommended if signal rate >10 MBd, see recommended drive circuit in Figure 11.
8. Pins 2, 6 and 7 are welded to the anode header connection to minimize the thermal resistance from junction to ambient. To further reduce the
thermal resistance, the anode trace should be made as large as is consistent with good RF circuit design.
9. Fiber NA is measured at the end of 2 meters of mode stripped fiber, using the far-field pattern. NA is defined as the sine of the half angle, determined
at 5% of the peak intensity point. When using other manufacturer’s fiber cable, results will vary due to differing NA values and specification
methods.
Parameter Symbol Min Typ2Max Units Conditions Reference
50/125 µm Fiber Cable
NA = 0.2
PT50 -18.8
-19.8
-17.3
-18.9
-15.8
-13.8
-13.8
-12.8
-11.4
-10.8
dBm peak TA = +25 °C, IF = 60mA dc
TA = +25 °C, IF = 100 mA dc
Notes 5, 6, 9
62.5/125 µm Fiber Cable
NA = 0.275
PT62 -15.0
-16.0
-13.5
-15.1
-12.0
-10.0
-10.0
-9.0
-7.6
-7.0
dBm peak TA = +25 °C, IF = 60mA dc
TA = +25 °C, IF = 100 mA dc
100/140 µm Fiber Cable
NA = 0.3
PT100 -9.5
-10.5
-8.0
-9.6
-6.5
-4.5
-4.5
-3.5
-2.1
-1.5
dBm peak TA = +25 °C, IF = 60mA dc
TA = +25 °C, IF = 100 mA dc
200 µm HCS Fiber Cable
NA - 0.37
PT200 -5.2
-6.2
-3.7
-5.3
-3.7
-1.7
+0.8
+1.8
+3.2
+3.8
dBm peak TA = +25 °C, IF = 60mA dc
TA = +25 °C, IF = 100 mA dc
Parameter Symbol Min Typ2Max Units Conditions Reference
62.5/125 µm Fiber Cable
NA = 0.275
PT62 -11.0
-12.0
-10.0
-10.0
-8.0
-7.0
dBm peak TA = +25 °C, IF = 60mA
Parameter Symbol Min Typ2Max Units Conditions Reference
Rise Time, Fall Time
(10% to 90%)
tr, tf4.0 6.5 nsec
No pre-
bias
IF = 60 mA
Figure 12
Note 7
Rise Time, Fall Time
(10% to 90%)
tr, tf3.0 nsec IF = 10 to 100 mA Note 7,
Figure 11
Pulse Width Distortion PWD 0.5 nsec Figure 11
All HFBR-14XX LED transmitters are classified as IEC 825-1 Accessible Emission Limit (AEL) Class 1 based upon the current proposed
draft scheduled to go in to effect on January 1, 1997. AEL Class 1 LED devices are considered eye safe. Contact your Agilent sales
representative for more information.
CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to damage
from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of these
components to prevent damage and/or degradation which may be induced by ESD.
18
Recommended Drive Circuits
The circuit used to supply
current to the LED transmitter
can significantly influence the
optical switching characteristics
of the LED. The optical rise/fall
times and propagation delays
can be improved by using the
appropriate circuit techniques.
The LED drive circuit shown in
Figure 11 uses frequency
compensation to reduce the
typical rise/fall times of the LED
and a small pre-bias voltage to
minimize propagation delay
differences that cause pulse-
width distortion. The circuit will
typically produce rise/fall times
of 3 ns, and a total jitter
including pulse-width distortion
of less than 1 ns. This circuit is
recommended for applications
requiring low edge jitter or high-
speed data transmission at
signal rates of up to 155 MBd.
Component values for this
circuit can be calculated for
different LED drive currents
using the equations shown
below. For additional details
about LED drive circuits, the
reader is encouraged to read
Agilent Application Bulletin 78
and Application Note 1038.
. V)1.84( 9 Figure from obtained be can V
:100mAI for Example
)(R
ps 2000
C(pF)
)3(R R R R
1R)( R
3.97
R
2
1
R
(A) I
1.6V)V3.97(V)V(V
R
F
ON F
X1
EQ2X3X2
X1EQ2
Y
X1
ON F
FCCFCC
Y
X4
=
=
Ω
=
===
−=Ω
=
−−+−
pF 169
11.8
ps 2000
C
32.4 (10.8) 3 R R R
10.8 1 - 11.8 R
11.8
3.97
93.5
2
1
R
93.5
0.100
6.193.16
R
0.100
1.6)1.843.97(51.84)(5
R
X4X3X2
EQ2
X1
Y
Y
=
Ω
=
Ω====
Ω==
Ω=
=
Ω=
+
=
−−+−
=
19
Figure 9. Forward Voltage and Current
Characteristics.
Figure 10. Normalized Transmitter Output vs.
Forward Current.
Figure 11. Recommended Drive Circuit.
Figure 12. Test Circuit for Measuring tr, tf.
100
80
60
40
20
10
1.2 1.4 1.6 1.8 2.0 2.2
VI - FORWARD VOLTAGE - V
IF - FORWARD CURRENT - mA
+85 °C
+25 °C
-40 °C
P(IF) – P(60 mA) – RELATIVE POWER RATIO
0
2.0
0.8
0
IF – FORWARD CURRENT – mA
20 40 80
1.6
0.4
1.2
60 100
1.8
1.4
1.0
0.6
0.2
10 30 50 70 90
P(IF) – P(60 mA) – RELATIVE POWER RATIO – dB
-7.0
-5.0
-4.0
-3.0
-2.0
-1.0
0
0.8
1.0
1.4
2.0
3.0
HFBR-14x2/x4
+5 V
Ry
RX1
C
¼ 74F3037
7
85RX4
¼ 74F3037
RX3
RX2
¼
74F3037
1
23
4, 5
+4.7 µF
15
14
¼ 74F3037
16
12, 13
0.1 µF
10
11
9
HP8082A
PULSE
GENERATOR
SILICON
AVALANCHE
PHOTODIODE
50 Ω
TEST
HEAD
HIGH SPEED
OSCILLOSCOPE
50 Ω
LOAD
RESISTOR
20
HFBR-24x2 Low-Cost 5 MBd
Receiver
Description
The HFBR-24x2 fiber optic
receiver is designed to operate
with the Agilent HFBR-14xx
fiber optic transmitter and 50/
125 µm, 62.5/125 µm, 100/ 140
µm, and 200 µm HCS® fiber
optic cable. Consistent coupling
into the receiver is assured by
the lensed optical system
(Figure 1). Response does not
vary with fiber size ≤ 0.100 µm.
The HFBR-24x2 receiver
incorporates an integrated photo
IC containing a photodetector
and dc amplifier driving an
opencollector Schottky output
transistor. The HFBR-24x2 is
designed for direct interfacing to
popular logic families. The
absence of an internal pull-up
resistor allows the open-
collector output to be used with
logic families such as CMOS
requiring voltage excursions
much higher than VCC.
Both the open-collector “Data”
output Pin 6 and VCC Pin 2 are
referenced to “Com” Pin 3, 7.
The “Data” output allows busing,
strobing and wired “OR” circuit
configurations. The transmitter
is designed to operate from a
single +5 V supply. It is essential
that a bypass capacitor (0.1 mF
ceramic) be connected from Pin
2 (VCC) to Pin 3 (circuit
common) of the receiver.
Housed Product
Unhoused Product
Absolute Maximum Ratings
Parameter Symbol Min Max Units Reference
Storage Temperature TS-55 +85 °C
Operating
Te m p er a t u r e
TA-40 +85 °C
Lead Soldering Cycle
Temp
Time
+260
10
°C
sec
Note 1
Supply Voltage VCC -0.5 7.0 V
Output Current IO25 mA
Output Voltage VO-0.5 18.0 V
Output Collector
Power Dissipation
PO AV 40 mW
Fan Out (TTL) N 5 Note 2
Vcc
DATA
COMMON
PIN 1 INDICATOR
BOTTOM VIEW
2
6
7 & 3
45
6
7
8
3
2
1
PIN
11
2
32
41
51
6
72
81
FUNCTION
NC
VCC (5 V)
COMMON
NC
NC
DATA
COMMON
NC
NOTES:
1. PINS 1, 4, 5 AND 8 ARE ELECTRICALLY CONNECTED
2. PINS 3 AND 7 ARE ELECTRICALLY CONNECTED TO HEADER
12
34
BOTTOM VIEW
PIN
1
2
3
4
FUNCTION
VCC (5 V)
COMMON
DATA
COMMON
21
Electrical/Optical Characteristics -40 °C to + 85 °C unless otherwise specified
Fiber sizes with core diameter ≤ 100 µm and NA ≤ 0.35, 4.75 V ≤ VCC ≤ 5.25 V
Dynamic Characteristics
-40 °C to +85 °C unless otherwise specified; 4.75 V ≤ VCC ≤ 5.25 V; BER ≤ 10-9
Notes:
1. 2.0 mm from where leads enter case.
2. 8 mA load (5 x 1.6 mA), RL = 560 W.
3. Typical data at TA = +25 °C, VCC = 5.0 Vdc.
4. D is the effective diameter of the detector image on the plane of the fiber face. The numerical value is the product of the actual detector diameter
and the lens magnification.
5. Measured at the end of 100/140 mm fiber optic cable with large area detector.
6. Propagation delay through the system is the result of several sequentially-occurring phenomena. Consequently it is a combination of data-rate-
limiting effects and of transmission-time effects. Because of this, the data-rate limit of the system must be described in terms of time differentials
between delays imposed on falling and rising edges.
7. As the cable length is increased, the propagation delays increase at 5 ns per meter of length. Data rate, as limited by pulse width distortion, is not
affected by increasing cable length if the optical power level at the receiver is maintained.
Parameter Symbol Min Typ3Max Units Conditions Reference
High Level Output Current IOH 5 250 µA VO = 18
PR < -40 dBm
Low Level Output Voltage VOL 0.4 0.5 V IO = 8 mA
PR > -24 dBm
High Level Supply Current ICCH 3.5 6.3 mA VCC = 5.25 V
PR < -40 dBm
Low Level Supply Current ICCL 6.2 10 mA VCC = 5.25 V
PR > -24 dBm
Equivalent NA NA 0.50
Optical Port Diameter D 400 µm Note 4
Parameter Symbol Min Typ3Max Units Conditions Reference
Peak Optical Input Power Logic Level HIGH PRH -40
0.1
dBm pk
µW pk
lP = 820 nm Note 5
Peak Optical Input Power Logic Level LOW PRL -25.4
2.9
-24.0
4.0
-9.2
120
-10.0
100
dBm pk
µW pk
dBm pk
µW pk
TA = +25 °C,
IOL = 8mA
IOL = 8mA
Note 5
Propagation Delay LOW to HIGH tPLHR 65 ns TA = +25 °C,
PR = -21 dBm,
Data Rate =
5 MBd
Note 6
Propagation Delay HIGH to LOW tPHLR 49 ns
CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to damage
from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of these
components to prevent damage and/or degradation which may be induced by ESD.
22
HFBR-24x6 Low-Cost 125 MHz
Receiver
Description
The HFBR-24x6 fiber optic
receiver is designed to operate
with the Agilent HFBR-14xx
fiber optic transmitters and 50/
125 µm, 62.5/125 µm, 100/140
µm and 200 µm HCS® fiber optic
cable. Consistent coupling into
the receiver is assured by the
lensed optical system (Figure 1).
Response does not vary with
fiber size for core diameters of
100 mm or less.
The receiver output is an analog
signal which allows follow-on
circuitry to be optimized for a
variety of distance/data rate
requirements. Low-cost external
components can be used to
convert the analog output to
logic compatible signal levels for
various data formats and data
rates up to 175 MBd. This
distance/data rate trade-off
results in increased optical
power budget at lower data
rates which can be used for
additional distance or splices.
The HFBR-24x6 receiver
contains a PIN photodiode and
low noise transimpedance
preamplifier integrated circuit.
The HFBR-24x6 receives an
optical signal and converts it to
an analog voltage. The output is
a buffered emitter follower.
Because the signal amplitude
from the HFBR-24x6 receiver is
much larger than from a simple
PIN photodiode, it is less
susceptible to EMI, especially at
high signaling rates. For very
noisy environments, the
conductive or metal port option
is recommended. A receiver
dynamic range of 23 dB over
temperature is achievable
(assuming 10-9 BER).
The frequency response is
typically dc to 125 MHz.
Although the HFBR-24x6 is an
analog receiver, it is compatible
with digital systems. Please refer
to Application Bulletin 78 for
simple and inexpensive circuits
that operate at 155 MBd or
higher.
The recommended ac coupled
receiver circuit is shown in
Figure 14. It is essential that a
10 ohm resistor be connected
between pin 6 and the power
supply, and a 0.1 mF ceramic
bypass capacitor be connected
between the power supply and
ground. In addition, pin 6
should be filtered to protect the
receiver from noisy host
systems. Refer to AN 1038, 1065,
or AB 78 for details.
Housed Product
Unhoused Product
Figure 13. Simplified Schematic Diagram.
CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to damage
from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of these
components to prevent damage and/or degradation which may be induced by ESD.
Vcc
ANALOG SIGNAL
VEE
PIN 1 INDICATOR
BOTTOM VIEW
2
6
3 & 7
45
6
7
8
3
2
1
PIN
11
2
32
41
51
6
72
81
FUNCTION
NC
SIGNAL
VEE
NC
NC
VCC
VEE
NC
NOTES:
1. PINS 1, 4, 5 AND 8 ARE ISOLATED FROM THE INTERNAL
CIRCUITRY, BUT ARE ELECTRICALLY CONNECTED TO EACH
OTHER.
2. PINS 3 AND 7 ARE ELECTRICALLY CONNECTED TO HEADER
12
34
BOTTOM VIEW
PIN
1
2
3
4
FUNCTION
SIGNAL
VEE
VCC
VEE
BIAS & FILTER
CIRCUITS VCC
VOUT
VEE
6
2
3, 7
POSITIVE
SUPPLY
ANALOG
SIGNAL
NEGATIVE
SUPPLY
5.0
mA
300 pF
23
Absolute Maximum Ratings
Electrical/Optical Characteristics -40 °C to +85 °C; 4.75 V ≤ Supply Voltage ≤ 5.25 V,
RLOAD = 511 W, Fiber sizes with core diameter ≤ 100 mm, and N.A. ≤ -0.35 unless otherwise specified.
Parameter Symbol Min Max Units Reference
Storage Temperature TS-55 +85 °C
Operating
Te m p er a t u r e
TA-40 +85 °C
Lead Soldering Cycle
Temp
Time
+260
10
°C
sec
Note 1
Supply Voltage VCC -0.5 6.0 V
Output Current IO25 mA
Signal Pin Voltage VSIG -0.5 VCC V
Parameter Symbol Min Typ2Max Units Conditions Reference
Responsivity RP5.3
4.5
79.6
11.5
mV/µW
mV/µW
TA = +25 °C @ 820
nm, 50 MHz
@ 820 nm, 50 MHz
Note 3, 4
Figure 18
RMS Output Noise Voltage VNO 0.40 0.59
0.70
mV
mV
Bandwidth filtered
@ 75 MHz
PR = 0 µW
Unfiltered
bandwidth
PR = 0 µW
Note 5
Figure 15
Equivalent Input Optical Noise Power
(RMS)
PN -43.0
0.050
-41.4
0.065
dBm
µW
Bandwidth Filtered
@ 75MHz
Optical Input Power (Overdrive) PR-7.6
175
-8.2
150
dBm pk
µW pk
dBm pk
µW pk
TA = +25 °C Note 6
Figure 16
Output Impedance ZO30 WTest Frequency =
50 MHz
dc Output Voltage VO dc -4.2 -3.1 -2.4 V PR = 0 µW
Power Supply Current IEE 915mAR
LOAD = 510 W
Equivalent NA NA 0.35
Equivalent Diameter D 324 µm Note 7
CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to damage
from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of these
components to prevent damage and/or degradation which may be induced by ESD.
24
Dynamic Characteristics -40 °C to +85 °C; 4.75 V ≤ Supply Voltage ≤ 5.25 V; RLOAD = 511 W, CLOAD = 5 pF unless
otherwise specified
Notes:
1. 2.0 mm from where leads enter case.
2. Typical specifications are for operation at TA = +25 °C and VCC = +5 V dc.
3. For 200 µm HCS fibers, typical responsivity will be 6 mV/mW. Other parameters will change as well.
4. Pin #2 should be ac coupled to a load ³ 510 ohm. Load capacitance must be less than 5 pF.
5. Measured with a 3 pole Bessel filter with a 75 MHz, -3 dB bandwidth. Recommended receiver filters for various bandwidths are provided in
Application Bulletin 78.
6. Overdrive is defined at PWD = 2.5 ns.
7. D is the effective diameter of the detector image on the plane of the fiber face. The numerical value is the product of the actual detector diameter
and the lens magnification.
8. Measured with a 10 ns pulse width, 50% duty cycle, at the 50% amplitude point of the waveform.
9. Percent overshoot is defined as:
10. The conversion factor for the rise time to bandwidth is 0.41 since the HFBR-24x6 has a second order bandwidth limiting characteristic.
Figure 14. Recommended ac Coupled Receiver Circuit. (See AB 78 and AN 1038 for more information.)
Parameter Symbol Min Typ2Max Units Conditions Reference
Rise/Fall Time 10% to 90% tr, tf3.3 6.3 ns PR = 100 µW peak Figure 17
Pulse Width Distortion PWD 0.4 2.5 ns PR = 150 µW peak Note 8,
Figure 16
Overshoot 2 % PR = 5 µW peak,
tr = 1.5 ns
Note 9
Bandwidth (Electrical) BW 125 MHz -3 dB Electrical
Bandwidth - Rise Time Product 0.41 Hz • s Note 10
100%x
V
VV
100%
100%PK
−
0.1 µF
LOGIC
OUTPUT
+5 V
10 Ω
30 pF
R
LOADS
500 Ω MIN.
6
2
3 & 7
POST
AMP
CAUTION: The small junction sizes inherent to the design of these components increase the components’ susceptibility to damage
from electrostatic discharge (ESD). It is advised that normal static precautions be taken in handling and assembly of these
components to prevent damage and/or degradation which may be induced by ESD.
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Hong Kong: (+65) 6756 2394
India, Australia, New Zealand: (+65) 6755 1939
Japan: (+81 3) 3335-8152(Domestic/International), or
0120-61-1280(Domestic Only)
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Data subject to change.
Copyright © 2003 Agilent Technologies, Inc.
Obsoletes: 5980-1065E
August 11, 2003
5988-3624EN
Figure 15. Typical Spectral Noise Density vs.
Frequency.
Figure 16. Typical Pulse Width Distortion vs.
Peak Input Power.
Figure 17. Typical Rise and Fall Times vs.
Temperature.
Figure 18. Receiver Spectral Response
Normalized to 820 nm.
150
0 50 100 150 200 250
FREQUENCY – MH
Z
125
100
75
50
25
0
300
SPECTRAL NOISE DENSITY – nV/ H
Z
3.0
02030405070
P
R
– INPUT OPTICAL POWER – µW
2.5
2.0
1.5
1.0
0.5
0
80
PWD – PULSE WIDTH DISTORTION – ns
10 60
6.0
-60 -40 -20 0 20 40
TEMPERATURE – ˚C
5.0
4.0
3.0
2.0
1.0
60
t
r
, t
f
– RESPONSE TIME – ns
80 100
t
f
t
r
1.25
400 480 560 640 720 800
λ – WAVELENGTH – nm
1.00
0.75
0
880
NORMALIZED RESPONSE
0.50
0.25
960 1040
