A1751A DWDM Analog
Forward-Path or Return-Path Laser Modules
Data Sheet, Rev. 4
June 2001
Features
■Higher temperature rating
■Excellent linearity
■Standard ITU wavelengths
■Advanced analog chip design
■Tested for forward and return path applications
■Reduces equipment requirements in the hub
■Exceeds
Telcordia Technologies
* 468 specifica-
tion.
Applications
■Node capability
■Narrow transmitter housing
■Networks with limited fiber
■Architectures using separate optical wavelengths
to carry targeted services
*
Telcordia Technologies
is a trademark of Telcordia Technologies,
Inc.
Description
The A1751A laser module is a dense wavelength-
division multiplexing (DWDM) laser for analog appli-
cations. It features a distrib uted-f eedback (DFB) chip
that has been designed specifically for radio fre-
quency (RF) applications. The A1751A laser module
has a wide temperature range for reliable perfor-
mance in harsh node environments and narrow
transmitter designs. It also features low adiabatic
chirp to maximize signal quality in short and long
lengths of fiber. The laser’s excellent inherent linear-
ity minimizes degradation of the broadcast signals
caused by the quadrature amplitude modulation
(QAM) channels.
Wavelength-division multiplexing is being designed
into cable television architectures. DWDM, a method
for delivering targeted QAM signals to diff erent loca-
tions, allows multiple signal sets to be combined onto
a single strand of fiber for transmission from a head-
end to a hub. At the hub , individual QAM signals can
be selected and combined with broadcast analog
channels. The v ersatile A1751A DWDM laser module
reduces cable network architecture fiber needs and
lessens equipment requirements in the hub.
The A1751A is available in a wide range of standard
ITU wa v elengths. The lasers are offered as either for-
ward-path (40 MHz—860 MHz) or return-path
(5 MHz—210 MHz) modules.
2
A1751A DWDM Ana log Data Sheet, Rev. 4
Forward-Path or Return-Path Laser Modules June 2001
Agere Systems Inc.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
* The devi ce can withstand continuous exposure to the specified limits without damage.
Characteristics
1. Tested in a 50 Ω resistiv ely matched system.
2. Eight channel loading with 10% OMI and 40 km fiber length.
3. Measured at 42 MHz.
4. Measured at 553.25 MHz, 577.25 MHz, and 595.25 MHz.
5. Change in wavelength as case temperature is changed.
Parameter* Symbol Min Max Unit
Operating Case Temperature Range TC–40 85 °C
Storage Temperature Range Tstg –40 85 °C
Monitor Photodiode Reverse Voltage VMPD —10V
Lase r Forward Current IF— 150 mA
Reverse Voltage (Laser) VR—2V
TEC Current ITEC —1.7A
RF Input Power PRFIN — 62 dBm V
Table 1. Key Characteristics
Parameter Symbol Conditions Min Typ Max Unit
Frequency Range:1
Return Path
Forward Path
F — 5
40 —
—210
860
MHz
MHz
MHz
Frequency Response:1
5 MHz—210 MHz
40 MHz—860 MHz
—I
F = 60 mA,
TOP = 25 °C —
—±0.5
±0.5 —
—dB
dB
RF Return Loss:1
5 MHz—210 MHz
40 MHz—860 MHz
RLRF IF = 60 mA, —
—>16
>16 —
—dB
dB
Optic al Output Power POIF = IOP 6, 8, or
10 ——mW
Laser Relative Intensity
Noise RIN IF = ITH + 70 mA,
T = 25 °C —< –155 — dB/Hz
Composite Second Order 2, 3 CSO IF = IOP
, OMI = 10% — — –50 dBc
Composite Triple Beat 2, 4 CTB IF = IOP
, OMI = 10% — — –60 dBc
Available Wavelengths λIP = IOP
, T = TOP 1527.94 — 1563.1 nm
Wavelength Drift 5λ∆ IF = 60 mA,
T = TOP,
TC varied from min—>max
— — 0.04 nm
Adiabatic Chirp FM IF = 60 mA,
TOP = 25 °C,
measured at 500 MHz
40 — 100 MHz/mA
Operating Ca se
Temperature Range TCIF = IOP –40 — 85 °C
3
Data Sheet, Rev. 4 A1751A DWDM Analog
June 2001 Forward-Path or Return-Path Laser Modules
Agere Systems Inc.
Characteristics (continued)
1. Bias point at which all specifications apply.
2. For 10 mW output power. Minimum slope efficiency is lower for lower-power lasers.
3. Chip temperature at which wavelength specification is met. Operating chip temperature is reported for each laser.
Electrical Schematics
Figure 1. A1751A Laser Schematic
Table 2. Additional Characteristics
Parameter Symbol Conditions Min Max Unit
Bias Current1IBBOL — 120 mA
Threshold Current ITH 25 °C, BOL — 30 mA
Slope Effi c ien cy2ηIP = ITH + 20 and
ITH + 60 0.10 — mW/mA
Monitor Photocurrent IMON IOP = 0 mA, VRM = 5 V,
TOP = 25 °C 10 200 µA/mW
Operating Chip Temperature3TOP IF = IOP 18 35 °C
TEC Current ITEC –40 °C < TC < 85 °C,
TOP = 15 °C—35 °C,
IF = 60 mA
–1.5 1.5 A
TEC Voltage VTEC TOP = 15 °C—35 °C over TC–2.5 3.8 V
Thermistor Resistance RTH TOP = 25 °C — 10.5 kΩ
Optical Return Loss RL TC40 — dB
Side Mode Suppression Ratio SMSR IF = IOP 30 — dB
1
2
3
4
5
6
7
14
13
12
11
10
9
8
CASE
GROUND
NC
(+)
(–)
(+)
(–)
TEC
(–)
(+)
CASE
GROUND
NC
ISOLATOR
(+)
1-1233(F)
4
A1751A DWDM Ana log Data Sheet, Rev. 4
Forward-Path or Return-Path Laser Modules June 2001
Agere Systems Inc.
Electrical Schematics (continued)
Figure 2. A1751A Circuit Schematic
1-1234(F)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
THERMISTOR
TEC (–)
MPC CATHODE
NC
THERMISTOR
dc LAS ER
BIAS
MPD ANODE
CASE GROUND
TEC (+)
CASE
GROUND
CASE
GROUND
MPC CATHODENC
LASER
COMMON (+)
LASER
MODULATION (–)
LASER
COMMON (+) 39 nH
200
Ω
0.01
µ
f
3.3
µ
H
1000 pf
1000 pf
0.01
µ
f
0.01
µ
f
SEE
SEE
3A AN D 3B
FIGURES
FIGURE 4
Figure 3a. Impedance-Matched Configuration
Figure 3b. Resistive-Matched Configuration
C7
1 pF— 0.01 µf0.01 µf
VSWR
T1*
3:5
2
3
0.5 pF—2.5 pF
SEE PIN 12,
FIGURE 2
0.01 µf
FREQUENCY
RESPONSE
*T1 (75 Ω) 3:5.
5 pF
1-1238F.a
SEE PIN 12,
FIGURE 2
37.5 Ω
R1
37.5 Ω
R2
1-1238F.b
5
Data Sheet, Rev. 4 A1751A DWDM Analog
June 2001 Forward-Path or Return-Path Laser Modules
Agere Systems Inc.
Electrical Schematics (continued)
Note: When ordering the dc set, the following boards are included: alarm board, 9108-004; TEC board, 9028-004; constant current, 9383-004.
Figure 4. dc Set (Agere Systems-Supplied Option)
CONSTANT ALARM
TEC
J2
1 THERMISTOR
2 THERMISTOR
3 dc LASER BIAS
4 MPD ANODE (CASE GROUND)
5 MPC CATHODE
6 TEC (+)
7 TEC (–)
8 GND
9 GND
10 GND
1
2
3
4
5
6
7
THERMISTOR
TEC (–)
MPC CATHO D E
THERMISTOR
dc LASER
BIAS
MPD ANODE
CASE GROUND
TEC (+)
MPC CATHO D E
39 nH
200
Ω
0.01
µ
f
3.3
µ
H
1000 pf
1000 pf
0.01
µ
f
0.01
µ
f
1-1238F.c
6
A1751A DWDM Ana log Data Sheet, Rev. 4
Forward-Path or Return-Path Laser Modules June 2001
Agere Systems Inc.
Outline Diagram
Dimensions are in inches and (millimeters).
Pin Information
Table 3. Pin Descriptions
Pin No. Description
1Thermistor
2Thermistor
3 dc Laser Bias (–)
4 MPD Anode, Case Ground
5 MPD Cathode
6 Thermoelectric Cooler (+)
7 Thermoelectric Cooler (–)
8 Case Ground
9 Case Ground
10 NC
11 Laser Common (+)
12 Laser Modulation (–)
13 Laser Common (+)
14 NC
LOCATION FOR LABEL
INCLUDING SERIAL NUMBER
AND DATE CODE
(LABEL NOT SHOWN)
0.049
(1.2)
4 x ø 0.105 (2.7)
0.213
(5.4)
PIN 1
LEADS
0.030 (0.8) WIDE x 0.008 (0.2) THICK
0.120 (3.0) MINIMUM LEN GTH
6 SPCS @ 0.100 (2.5)
0.250
(6.4)
0.190 ± 0.03
(5.0 ± 0.8)
0.078
(2.0)
0.215 ± 0.01
(5.5 ± 0.25) 0.248
(6.3)
0.040
(1.0)
0.350
(8.9)
0.500
(12.7)
0.820
(20.8)
1.025
(26.0)
1.180
(30.0)
0.365
(9.3)
0.700 ± 0.03
(18.0 ± 0.8)
1-1179.(F)a
7
Data Sheet, Rev. 4 A1751A DWDM Analog
June 2001 Forward-Path or Return-Path Laser Modules
Agere Systems Inc.
Laser Safety Information
Class IIIb Laser Product
FDA/CDRH Class IIIb laser product. All versions are Class IIIb laser products per CDRH, 21 CFR 1040 Laser
Safety requirements. All versions are Class 3B laser products per
IEC
* 60825-1:1993. The device has been classi-
fied with the FDA under an accession number to be determined.
This product complies with 21 CFR 1040.10 and 1040.11.
Single-mode fiber pigtail with SC/APC connectors (standard)
Wavelength = 1.5 µm
Maximum power = 30 mW
Because of size constraints, laser saf ety labeling (including an FD A Class IIIb label) is not affixed to the module but
attached to the outside of the shipping carton.
Product is not shipped with power supply.
Caution: Use of controls, adjustments, and procedures other than those specified herein may result in
hazardous laser radiation exposure.
*
IEC
is a registered trademark of The International Electrotechnical Commission.
Ordering Information
* For additional ordering information, please contact an Agere Systems at Opto West, 1-800-362-3891 (for sales staff, please press option 2).
Table 4. Ordering Information*
Device Code Description Connector Comcode
A1751A
(See Ordering Code
Definitons, next page)
D WDM Analog Forw ard or Return
Path Laser Module SC/APC standard;
FC/APC available TBD
DANGER
INVISIBLE LASER RADIATION
IS EMITTED FROM THE END
OF FIBER OR CONNECTOR
Avoid direct exposure to beam
Do not view beam directly with
optical instruments
INVISIBLE LASER RADIATION EMITTED FROM END OF FIBER OR CONNECTOR
Avoid exposu re to beam
Class 3B L aser Product IEC-60825M 1993 Max. Outp ut: 30 mW Wavelength: 1.5
µ
m
8
A1751A DWDM Ana log Data Sheet, Rev. 4
Forward-Path or Return-Path Laser Modules June 2001
Agere Systems Inc.
Ordering Information (continued)
Ordering Code Def initio n s
Field Description
Family Name
Analog DWDM, DFB, Laser
Optical Connector
SC = SC/APC
FC = FC/APC
PG = None (No connector)
Optical Power
06 = 6 mw
A1751 19 FF FC 10
08 = 8 mw
10 = 10 mw
Frequency Channel
RR = Return path
FF = Forward path
Wavelength
21 = ch. 21
25 = ch. 25
27 = ch. 27
29 = ch. 29
31 = ch. 31
33 = ch. 33
35 = ch. 35
37 = ch. 37
39 = ch. 39
41 = ch. 41
43 = ch. 43
45 = ch. 45
47 = ch. 47
49 = ch. 49
51 = ch. 51
53 = ch. 53
55 = ch. 55
57 = ch. 57
59 = ch. 59
61 = ch. 61
20 = ch. 20
22 = ch. 22
24 = ch. 24
26 = ch. 26
28 = ch. 28
30 = ch. 30
32 = ch. 32
34 = ch. 34
36 = ch. 36
38 = ch. 38
40 = ch. 40
42 = ch. 42
44 = ch. 44
46 = ch. 46
48 = ch. 48
50 = ch. 50
52 = ch. 52
54 = ch. 54
56 = ch. 56
58 = ch. 58
60 = ch. 60
19 = ch. 19
23 = ch. 23
62 = ch. 62
Custom
00
01
02
03
04
05
06
07
08
09
NN = NPR
BB = Both FF and RR
YY
9
Data Sheet, Rev. 4 A1751A DWDM Analog
June 2001 Forward-Path or Return-Path Laser Modules
Agere Systems Inc.
Notes
For additional informatio n, co nta ct you r Agere Systems Account Ma nager or the following:
INTERNET: http://www.agere.com
E-MAIL: docmaster@micro.lucent.com
N. AMERICA: Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allen town, PA 18109-3286
1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)
ASIA PACIFIC: Agere Systems Singa pore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 11825 6
Tel. (65) 778 8833, FAX (65) 777 7495
CHINA: Agere Systems (Shanghai) Co., Ltd., 33/F Jin Mao Tower, 88 Centur y Boulevard Pudong, Shanghai 200121 PRC
Tel. (86) 21 50471212, FAX (86) 21 50472266
JAPAN: Agere Systems Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan
Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700
EUROPE: Data Requests: DATALINE: Tel. (44) 7000 582 368, FAX (44) 1189 328 148
Technical Inq ui ries: OPTOELECTRONICS MARKET ING: (44) 1344 865 900 (Ascot UK)
Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.
Copyright © 2001 Agere Systems Inc.
All Rights Reserved
June 2001
DS00-349OPTO-4 (Replaces DS00-349OPTO -3)
A1751A DWDM Ana log Data Sheet, Rev. 4
Forward-Path or Return-Path Laser Modules June 2001
