Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 1
Product Specification
25G Ethernet RoHS Compliant Long Wavelength SFP28
Transceiver
FTLF1436P3BCL
PRODUCT FEATURES
Up to 25.78 Gb/s bi-directional
data links
Hot-pluggable SFP28 footprint
Built-in digital diagnostic functions
1310nm DFB laser transmitter
Duplex LC connector
RoHS compliant
Up to 10 km on 9/125m SMF
Metal enclosure, for lower EMI
1.5W maximum power consumption
with established link
Single 3.3V power supply
Operating temperature range:
0°C to 70°C
APPLICATIONS
25GE LR
Finisar’s FTLF1436P3BCL SFP28 transceivers are designed for use in Ethernet links up
to 25.78 Gb/s data rate and up to 10 km link length. They are compliant SFF-8472 Rev
12.2
b
, and compatible with SFF-8432
a
and applicable portions of SFF-8431 Rev. 3.0
c
.
The product is RoHS compliant and lead-free per Directive 2011/96/EU
d
and Finisar
Application Note AN-2038.
PRODUCT SELECTION
FTLF1436P3BCL
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 2
I. Pin Descriptions
Pin Symbol Name/Description Ref.
1 V
EET
Transmitter Ground (Common with Receiver Ground) 1
2 T
FAULT
Transmitter Fault. 2
3 T
DIS
Transmitter Disable. Laser output disabled on hi
g
h or open. 3
4 SDA 2-wire Serial Interface Data Line (MOD-DEF2) 4
5 SCA 2-wire Serial Interface Clock (MOD-DEF1) 4
6 MOD
_
ABS Module Absent, connected to V
EET
or V
EER
4
7 RS0 Rx Rate Select: No Connect 5
8 LOS Loss of Si
g
nal indication. Lo
g
ic 0 indicates normal operation. 6
9 RS1
Tx Rate Select: No Connect 5
10 V
EER
Receiver Ground (Common with Transmitter Ground) 1
11 V
EER
Receiver Ground (Common with Transmitter Ground) 1
12 RD-
Receiver Inverted DATA out. AC Couple
d
13 RD+ Receiver Non-inverted DATA out. AC Coupled
14 V
EER
Receiver Ground (Common with Transmitter Ground) 1
15 V
CCR
Receiver Power Suppl
y
16 V
CCT
Transmitter Power Suppl
y
17 V
EET
Transmitter Ground (Common with Receiver Ground) 1
18 TD+ Transmitter Non-Inverted DATA in. AC Coupled.
19 TD-
Transmitter Inverted DATA in. AC Coupled.
20 V
EET
Transmitter Ground (Common with Receiver Ground) 1
Notes:
1. Circuit ground is internally isolated from chassis ground.
2. T
FAULT
is an open collector/drain output, which should be pulled up with a 4.7k – 10k Ohms resistor on
the host board if intended for use. Pull up voltage should be between 2.0V to Vcc + 0.3V. A high
output indicates a transmitter fault caused by either the TX bias current or the TX output power
exceeding the preset alarm thresholds. A low output indicates normal operation. In the low state, the
output is pulled to <0.8V.
3. Laser output disabled on T
DIS
>2.0V or open, enabled on T
DIS
<0.8V.
4. Should be pul led up with 4.7 k – 10 kohms on host boar d t o a volta ge between 2.0V and 3 .6V.
MOD_ABS pulls line low to indicate module is plugged in.
5. Rate select can also be set through the 2-wire bus in accordance with SFF-8472 v. 12.1
c
. Rx Rate
Select is set at Bit 3, Byte 110, Address A2h. Tx Rate Select is set at Bit 3, Byte 1 18 , Address A2h.
Note: writing a “1” selects maximum bandwidth operation. Rate select is the logic OR of the input
state of Rate Select Pin and 2-wire bus.
6. LOS is open collector output. Should be pulled up with 4.7k – 10kohms on host board to a voltage
between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 3
Diagram of Host Board Connector Block Pin Numbers and Names
VeeT
VeeT
VeeR
VeeR
TD-
TD+
RD+
RD-
VccT
VccR
VeeT
VeeR
TXFault
MOD-DEF(2)
MOD-DEF(1)
MOD-DEF(0)
Rate Select
LOS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Towards
ASIC
Towards
Bezel
TX Disable
VeeR
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 4
II. Absolute Maximum Ratings
Parameter Symbol Min Typ Max Unit Ref.
Maximum Suppl
y
Volta
g
e Vcc -0.5 4.0 V
Storage Temperature T
S
-40 85 C
Case Operating Temperature T
C
0 70
C
Relative Humidit
y
(Non-condensin
g
) RH 0 85 % 1
Notes:
1. Non Condensing
III. Electrical Characteristics
(T
A
, V
CC
= 3.15 to 3.46 Volts)
Parameter Symbol Min Typ Max Unit Ref.
Suppl
y
Volta
g
e Vcc 3.15 3.46 V
Suppl
y
Current Icc 400 mA 1
Transmitter
Input differential impedance R
in
100 2
Sin
g
le-ended data input swin
g
Vin,pp
125 450 mV 3
Inner E
y
e Hei
g
ht EH6 95 mV 3
Transmit Disable Volta
g
e V
D
2 Vcc V 4
Transmit Enable Volta
g
e V
EN
Vee Vee+0.8 V
Receiver
Sin
g
le ended data output swin
g
Vout,pp
185 425 mV 5
LOS Fault V
LOS fault
2Vcc
HOST
V6
LOS Normal V
LOS norm
Vee Vee+0.8 V 6
Power Suppl
y
Re
j
ection PSR
100 mVpp 7
Notes:
1. With established link, the total power dissipation shall not exceed 1.3W.
2. Connected directly to TX data input pins. AC coupling from pins in to laser driver IC.
3. The minimum value represents the minimum o ute r eye amplitude. Inner Eye Height represent the high
loss case.
4. Or open circuit.
5. Into 100 ohms differential termination.
6. LOS is an open collector output. Should be pulled up with 4.7k – 10kohms on the host board. Normal
operation is logic 0; loss of signal is logic 1. Maximum pull-up voltage is 5.5V.
7. Receiver sensitivity is compliant with power supply sinusoidal modulation of 20 Hz to 1.5 MHz up to
specified value applied thro ugh the recommended power supply filtering network.
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 5
IV. Optical Characteristics
(T
A
, V
CC
= 3. 15 to 3.46 Volts)
Parameter Symbol Min Typ Max Unit Ref.
Transmitter
Average Outpu
t
Powe
r
, 25.78Gb/s P
OUT
-7.0 +2.0 dBm 1,2
Optical Wavelength
1295 1325 nm
Spectral Width (-20dB)
1 nm 3
Side Mode Suppression Ratio 30 dB
Optical Modulation Amplitude, 25.78Gb/s OMA -4 2.2 dBm 4
Launch power in OMA-TDP (min) -5 dB
Transmitte
r
Dispersion Penalty, 25.78Gb/s TDP 2.7 dB
Extinction Ratio ER 3.5 dB
Relative Intensity Noise RIN
20
OMA -130 dB/Hz
Average Launch Power of OFF Transmitte
r
-20 dBm
Optical Return Loss 20 dB
Transmitter Reflectance -12 dB
Receiver
Unstressed Receiver OMA Sensitivity ,
25.78Gb/s RxSENS
-11.3 dBm 5
Maximum Receiver Power OMA 2.2
Stress sensitivity (OMA) -8.8 6
Damage threshold 3 dBm
Average Receiver Power Rx
MAX
-13.3 2.0 dBm
Optical Center Wavelength
c
1260 1370 nm
LOS De-Asser
t
LOS
D
-17 dBm
LOS Assert LOS
A
-30 dBm
LOS Hysteresis 0.5 dB
Receiver Reflectance -12 dB
Notes:
1. Class 1 Laser Safety per FDA/CDRH and EN (IEC) 6082 5 regulations .
2. High Bandwidth Mode. Class 1 Laser Safety per FDA/CDRH and EN (IEC) 60825 regulations.
3. 20dB spectral width.
4. Equivalent extinction ratio specificatio n for Fibre Channel. Allow s smaller ER at higher average
power.
5. At 5E
-5
BER, KR4 FEC
6. Per IEEE802.3cc
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 6
IV. General Specifications
Parameter Symbol Min Typ Max Units Ref.
Data Rate BR 25.78 Gb/sec
Bit Error Rate BER 5E(-5)
1
Fiber Len
g
th L 10 km 2
Notes:
1. Tested with a PRBS 2
31
-1 test pattern.
2. Distances are based o n. IEEE 80 2.3 standards.
VI. Environmental Specifications
Parameter Symbol Min Typ Max Units Ref.
Case Operating Temperature T
op
0 70 °C
Storage Temperature T
sto
-40 85 °C
VII. Regulatory Compliance
Finisar transceivers are Class 1 Laser Products and comply with US FDA regulations.
These products are certified by TÜV and CSA to m eet the Class 1 ey e safety requirem ents
of EN (IEC) 60825 and the electrical safety requirements of
EN (IEC) 60950. Copies of certificates are available at Finisar Corporation upon request.
.
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 7
VIII. Digital Diagnostic Functions
Finisar FTLF1436P3BCL SFP28 transceivers support the 2-wire serial communication protocol as
defined in the SFP MSA
e
. It is very closely related to the E
2
PROM defined in the GBIC standard, with
the same electrical specifications.
The standard SFP serial ID provides access to identification information that describes the
transceiver’s capabilities, standard interfaces, manufacturer, and other information.
Additionally, Finisar SFP transceivers provide a enhanced digital diagnostic monitoring interface,
which allows real-time access to device operating parameters such as transceiver temperature, laser
bias current, transmitted optica l power, received optical power and transc eiver supply voltage. It also
defines a sophisticated system of alarm and warning flags, which alerts end-users when particular
operating parameters are outside of a factory set normal range.
The SFP MSA defines a 256-byte memory map in E
2
PROM that is accessible over a
2-wire serial interface at the 8 bit address 1010000X (A0h). The digital diagnostic monitoring interface
makes use of the 8 bit address 1010001X (A2h), so the originally defined serial ID memory map
remains unchanged. The interface is identical to, and is thus fully backward compatible with both the
GBIC Specification and the SFP Multi Source Agreement. The complete interface is described in
Finisar Application Note AN-2030: “Digital Diagnostics Monitoring Interface for SFP Optical
Transceivers”.
The operating and diagnostics information is monitored and reported by a Digital Diagnostics
Transceiver Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial
interface. When the serial protocol is activated, the serial clock si gnal (SCL, Mod Def 1) is generated
by the host. The positive edge clocks data into the SFP transceiver into those segments of the E
2
PROM
that are not write-protected. The negative edge clocks data from the SFP transceiver. The serial data
signal (SDA, Mod Def 2) is bi-directional for serial data transfer. The host uses SDA in conjunction
with SCL to mark the start and end of serial protocol activation. The memories are organized as a
series of 8-bit data words that can be addressed individually or sequentially.
For more information, please see the SFP MSA documentation
e
and Finisar Application Note AN-
2030.
TX Equalization Control
Tx input equalization control can be accessed through 2-wire serial interface at by te address
114 (A2h). Tx input equalization control for 25GE is located at the upper 4 bits of byte 114
(A2h) while the lower 4 bits are reserved for rate low in the case of dual rate application.
RX Emphasis Control
Rx output emphasis control can be accessed through 2-wire serial interface at byte address 115
(A2h). Rx output emphasis control for 25GE is located at the upper 4 bits of byte 115 (A2h)
while the lower 4 bits are reserved for rate low in the case of dual rate application.
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 8
IX. Digital Diagnostic Specifications
FTLF1436P3BCL transceivers can be used in host systems that require either internally
or externally calibrated digital diagnostics.
Parameter Symbol Units Min Max Accuracy Ref.
Transceiver Temperature DDDTemp ºC 0 +70 ±5ºC
Transceiver Suppl
y
Volta
g
e DDDVolta
g
e V 3.15 3.45 ±3%
Transmitter Bias Current DDDBias mA 0 35 ±10% 1
Transmitter Output Powe
r
DDDTx-Powe
r
dBm -5 +3 ±3dB
Receiver Avera
g
e Optical Input Powe
r
DDDRx-Powe
r
dBm -12 +3 ±3dB
Notes:
1. Accuracy of Measured Tx Bias Current is 10% of the actual Bias Current from the laser driver to the
laser.
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 9
X. Mechanical Specifications
Finisar’s FTLF1436P3BCL SFP28 transceivers are compatible with the SFF-8432
b
specification for improved pluggable form factor.
FTLF1436P3BCL
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 10
XI. PCB Layout and Bezel Recommendations
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 11
FTLF1436P3BCL Produ c t Specificatio n
Finisar Corporation – February 2018 Rev C1 Finisar Confidential Page 12
XII. References
a. “Improved Pluggable Form Factor”, SFF Document Number SFF-8432, Revision
5.0, July 16, 2007.
b. “Digital Monitoring Interface for Optical Transceivers”, SFF Document Number
SFF-8472, Revision 12.2, 2014.
c. “Enhanced Small Form Factor Pluggable Module ‘SFP+ ‘”, SFF Document
Number SFF-8431, Revision 4.1, July 6, 2009; Addendum Jun 21, 2013.
d. Directive 2011/65/EU of the European Council Parliament and of the Council,
“on the restriction of the use of certain hazardous substances in electrical and
electronic equipment”. 08-June 2011, which supercedes the previous ROHS
Directive 2002/95/EC.
e. Small Form Factor Pluggable (SFP) Transceiver Multi-source Agreement (MSA),
September 14, 2000 which is available as SFF Document Number INF-8074,
Revision 1.0 May 12, 2001
f. “0.8mm Card Edge Connector for 16Gb/s Applications”, SFF Document Number
SFF-8081, Revision 0.2, December 21, 2009.
g. SFF-8402, Revision 0.2
XIII. For More Information
Finisar Corporation
1308 Moffett Park Drive
Sunnyvale, CA 94089-1133
Tel. 1-408-548-1000
Fax 1-408-541-6138
sales@finisar.com
www.finisar.com
