Finisar Corporation – September 2015 Rev. C1 Page 1
Product Specification
10Gb/s 80km Single Mode SFP+ Transceiver
FTLX1871D3BCL
PRODUCT FEATURES
Hot-pluggable SFP+ footprint
Supports 8.5 and 9.95 to 11.3 Gb/s
80km link length
-5/70°C case temperature range
Cooled 1550nm EML laser
Limiting electrical interface receiver
Duplex LC connector
Built-in digital diagnostic functions
RoHS-6 compliant (lead-free)
APPLICATIONS
10G Ethernet ZR and 10G Fibre Channel
OTN G.709 OTU1e/2/2e FEC bit rates
8.5Gb/s Fibre Channel
Finisar’s FTLX1871D3BCL transceivers are Enhanced Small Form Factor Pluggable
SFP+ transceivers designed for use in 10-Gigabit multi-rate links up to 80km of G.652
single mode fiber. They are compliant with SFF-84311, SFF-84322 and support 10G
Ethernet ZR and 10G Fibre Channel.
Digital diagnostics functions are available via a 2-wire serial interface, as specified in
SFF-84723. The optical transceiver is compliant per the RoHS Directive
2011/65/EU4. See Finisar Application Note AN-2038 for more details5.
PRODUCT SELECTION
FTLX1871D3BCL
FTLX1871D3BCL Product Specification
Finisar Corporation - September 2015 Rev. C1 Page 2
I. Pin Descriptions
Pin Symbol Name/Description Ref.
1 VEET Transmitter Ground 1
2 TFAULT Transmitter Fault 2
3 TDIS Transmitt er Disabl e. Laser o u t put di sabl ed on high or open. 3
4 SDA 2-wire Serial Interface Data Line 2
5 SCL 2-wire Serial Interface Clock Line 2
6 MOD_ABS Module Absent. Grounded within the module 2
7 RS0 Rate Select 0. 4
8 RX_LOS Loss of Signal indication. Logic 0 indicates normal operation. 5
9 RS1 Rate Select 1. 4
10 VEER Receiver Ground 1
11 VEER Receiver Ground 1
12 RD- Receiver Inverted DATA out. AC Coupled.
13 RD+ Receiver Non-inverted DATA out. AC Coupled.
14 VEER Receiver Ground 1
15 VCCR Receiver Power Supply 6
16 VCCT Transmitter Power Supply 6
17 VEET Transmitter G round 1
18 TD+ Transmitter Non-Inverted DATA in. AC Coupled.
19 TD- Transmitter Inverted DATA in. AC Coupled.
20 VEET Transmitter G round 1
Notes:
1. Circuit ground is internally isolated from chassis ground.
2. TFAULT is an open collector/drain output, which should be pulled up with a 4.7k – 10k Ohms resistor on
the host board if intende d fo r use. Pull u p vo l t age sho ul d be betwee n 2.0V to Vcc + 0.3V. A hig h
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 TDIS >2.0V or open, enabled on TDIS <0.8V.
4. Internally pulled down per SFF-8431 Rev 4.1.
5. LOS is open collector output. Should be pulled up with 4.7k – 10k on host boa rd to a vol t age
between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.
6. Internally connected
Figure 1. Diagram of Host Board Connector Block Pin Numbers and Names.
VeeT
VeeT
VeeR
VeeR
TD-
TD+
RD+
RD-
VccT
VccR
VeeT
VeeR
TX_Fault
SDA
SCL
MOD_ABS
RS0
RX_LOS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Towards
A
SIC
Towards
Bezel
TX_Disable
RS1
FTLX1871D3BCL Product Specification
Finisar Corporation - September 2015 Rev. C1 Page 3
II. Absolute Maximum Ratings
Exceeding the limits below may damage the transceiver module permanently.
Parameter Symbol Min Typ Max Unit Ref.
Maximum Supply Voltage Vcc -0.5 4.0 V
Sto rage Temperature TS -40 85 C
Relative Humidity RH 0 85 % 1
Receiver Optical Damage Threshold RxDamage 5 dBm
Notes:
1. Non-condensing
III. Electrical Characteristics (TOP = -5 to 70 C)
Parameter Symbol Min Typ Max Unit Ref.
Supply Volt age Vcc 3.14 3.30 3.46 V
Power Consumption Pdiss 1.5 W 1
Transmitter (Tx)
Input differential impedance Rin 80 100 120
Differential da ta input swing Vin,pp 120 850 mV 2
Transmit Disable Voltage VD V
cc-0.8 Vcc V
Transmit Enable Voltage VEN 0 0.8 V
Receiver (Rx)
Output differential impedance Rout 80 100 120
Differential data output swing Vou
t
,pp 300 850 mV 2
Output rise time and fall time T
r
, Tf 28 ps 3
LOS asserted VLOS A Vcc-0.8 Vcc V 4
LOS de-asserted VLOS D 0 0.8 V 4
Power Supply Noise Tolerance VccT/VccR Per SFF-8431 Rev 4.1 mVpp 5
Notes:
1. 70C case temperature and beginning of life
2. Internally AC coupled.
3. 20 – 80%. Measured with Module Compliance Test Board and OMA test pattern. Use of four 1’s and four 0’s
sequence in the PRBS 9 is an acceptable alternative. SFF-8431 Rev 4.1.
4. LOS is an open collector output. Should be pulled up with 4.7k – 10k on the host board. Normal operation is
logic 0; loss of signal is logic 1.
5. See Section 2.8.3 of SFF-8431 Rev 4.1.
FTLX1871D3BCL Product Specification
Finisar Corporation - September 2015 Rev. C1 Page 4
IV. Optical Characteristics (TOP = -5 to 70 C, VCC = 3.14 to 3.46 Volts)
Parameter Symbol Min Typ Max Unit Ref.
Transmitter (Tx)
Average Launch Power PAVE 0 4 dBm
Optical Wavelength
1530 1565 nm
Side-Mode Suppression Ratio SMSR 30 dB
Optical Extinction Ratio ER 9 dB
Average Launch power when Tx is OFF POFF -30 dBm
Relative Intensity Noise RIN -128 dB/Hz
Receiver (Rx)
Optical Center Wavelength
C
1260 1600 nm
Receiver Reflectance Rrx -27 dB
Sensitivity
(0km)
Bit Rate (Gb/s) BER
8.5, 9.95-10.7 <10-12 R
SENS1 -24 dBm 1,2
11.1 <10-12 R
SENS2 -23 dBm 1
<10-4 R
SENS3 -27 dBm 1
11.3 <10-4 R
SENS4 -27 dBm 1
Sensitivity
(80km) 8.5, 9.95-10.7 <10-12 R
SENS5 -22 dBm 1,2,3
11.1 <10-4 R
SENS6 -25 dBm 1,3
Overload (Average Power) PAVE -7 dBm
LOS De-Assert LOSD -28 dBm
LOS Assert LOSA-37 -30 dBm
LOS Hysteresis LOSH0.5 dB
Notes:
1. Measured with worst ER=9 dB; PRBS 231 – 1.
2. For 10GEthernet application, -24dBm is equivalent to an OMA of -22.09dBm for an ER = 9 dB.
3. The receiver sensitivity over fiber may vary depending on the host’s clock and data recovery model.
V. General Specifications
Parameter Symbol Min Typ Max Units Ref.
Bit Rate BR 8.5 11.3168 Gb/s 1
Max. Supported Link Length LMAX 80 km
2
Notes:
1. Tested with a 231 – 1 PRBS pattern at the BER defined in Table IV.
2. Over G.652 single mode fiber.
Timing Parameters
Parameter Symbol Min Typ Max Units Ref.
Time to initialize t_start_up 10 s
VI. Environmental Specifications
Parameter Symbol Min Typ Max Units Ref.
Case Operating Temperature Top -5 70 °C
Sto rage Temperature Tsto -40 85 °C
FTLX1871D3BCL Product Specification
Finisar Corporation - September 2015 Rev. C1 Page 5
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 meet the Class 1 eye safety
requirements of EN (IEC) 60825 and the electrical safety requirements of
EN (IEC) 60950. Copies of certificates are available at Finisar Corporation upon request.
FTLX1871D3BCL Product Specification
Finisar Corporation - September 2015 Rev. C1 Page 6
VIII. Digital Diagnostic Functions
Finisar FTLX1871D3BCL SFP+ transceivers support the 2-wire serial
communication protocol as defined in the SFP MSA1. It is very closely related to the
E2PROM 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 optical power, received optical
power and transceiver 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 E2PROM 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
signal (SCL, Mod Def 1) is generated by the host. The positive edge clocks data into the
SFP transceiver into those segments of the E2PROM 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 documentation3 and Finisar
Application Note AN-20307.
Please note that evaluation board FDB-1027 is available with Finisar ModDEMO
software that allows simple to use communication over the 2-wire serial interface.
FTLX1871D3BCL Product Specification
Finisar Corporation - September 2015 Rev. C1 Page 7
IX. Digital Diagnostic Specifications
FTLX1871D3BCL transceivers can be used in host systems that require either
internally or externally calibrated digital diagnostics.
Parameter Symbol Units Min Max Accuracy Ref.
Accuracy
Transceiver temperature
DDTem
p
ºC -5 +70 ±5ºC 1
Transceiver supply voltage
DDVolta
g
e V 2.8 4.0 ±3%
Transmitter bias current
DDBias mA 0 127 ±10% 2
Transmitter output power
DDTx-Powe
dBm -1 +5 ±2dB
Receiver average optical input power
DDRx-Powe
dBm -28 -5 ±2dB
Notes:
1. Internally measured
2. The accuracy of the Tx bias current is 10% of the actual current from the laser driver to the laser
X. SFF-8431 Power-up Sequence
The typical power consumption of the FTLX1871D3BCL may exceed the limit of
1.5W specified for the Power Level II transceivers in [1], for which a power-up sequence
is recommended. However, the FTLX1871D3BCL is factory set to power-up directly to
its operating conditions in Power Level Mode II. Upon request, it can be factory set to
follow the power-up sequence specified for transceivers exceeding 1W, as per [1]. In
power level I, the FTLX1871D3BCL does not carry traffic, but the 2-wire serial
communication is active.
Please refer to [1] and Finisar Application Note AN-2076 for additional details.
FTLX1871D3BCL Product Sp ecification
Finisar Corporation - September 2015 Rev. C1 Page 8
XI. Mechanical Specifications
Finisar FTLX1871D3BCL SFP+ transceivers are compatible with the SFF-8432
specification for improved pluggable form factor, and shown here for reference purposes
only. Bail color is white.
Figure 2. Mechanical Dimensions
Note: the option of the label on the top side of the transceiver is not recommended.
FTLX1871D3BCL Product Specification
Finisar Corporation - September 2015 Rev. C1 Page 9
XII. Host Board SFP+ Connector Recommendations
Figure 3. PCB Layout and Bezel Recommendations, as per [9]
FTLX1871D3BCL Product Specification
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Figure 4
FTLX1871D3BCL Product Specification
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XIII. Host-Module Interface Diagram
Figure 5
FTLX1871D3BCL Product Specification
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XIV. References
1. “Specifications for Enhanced 8.5 and 10 Gigabit Small Form Factor Pluggable
Module ‘SFP+ ‘”, SFF Document Number SFF-8431, Revision 4.1.
2. “Improved Pluggable Form factor”, SFF Docume nt Number SFF-8432, Revision 4.2,
April 18, 2007.
3. “Digital Diagnostics Monitoring Interface for Optical Transceivers”. SFF Document
Number SFF-8472, Revision 10.1, March 1, 2007.
4. 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”
5. “Application Note AN-2038: Finisar Implementation of RoHS Compliant
Transceivers”
6. Small Form-factor Pluggable (SFP) Transceiver Multi-Source Agreement (MSA)
7. “Application Note AN-2030: Digital Diagnostic Monitoring Interface for SFP Optical
Transceivers”
XV. Modification History
Revision Date Description
B1 April 2014 Initial Release
B2 September 2014 Correction of a typo in the H/W pin de scription
C1 September 2015 Updated logo and RoHS statement
XVI. For More Information
Finisar Corporation
1389 Moffett Park Drive
Sunnyvale, CA 94089-1133
Tel. 1-408-548-1000
Fax 1-408-541-6138
sales@finisar.com
www.finisar.com