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40GBASE - LR4 SFP Optical Transceiver Module Single Mode Fiber 4 CWDM Lanes

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40GBASE - LR4 SFP Optical Transceiver Module Single Mode Fiber 4 CWDM Lanes

40GBASE - LR4 SFP Optical Transceiver Module Single Mode Fiber 4 CWDM Lanes
40GBASE - LR4 SFP Optical Transceiver Module Single Mode Fiber 4 CWDM Lanes

Large Image :  40GBASE - LR4 SFP Optical Transceiver Module Single Mode Fiber 4 CWDM Lanes

Product Details:
Place of Origin: Shenzhen, China
Brand Name: E-link China
Certification: CE, RoHS, FCC
Model Number: LNK-QSFP-LR
Payment & Shipping Terms:
Minimum Order Quantity: 1 piece
Price: Negotiation
Packaging Details: 10 piece in 1 carton box
Delivery Time: 3-5 working days
Payment Terms: T/T, Western Union, MoneyGram, Paypal
Supply Ability: 1000000000pcs/Month
Detailed Product Description
CWDM: Support 1.1Gbps Data Rate: Support
Fiber Type: Single Mode Power Dissipation: < 3.5 W
Operating Temperature: 0°C To 70°C Distance: 10km
High Light:

sfp bidirectional transceiver


cisco compatible sfp modules

40GBASE-LR4 4 CWDM lanes 1310 nm SMF 10km SFP Optical Transceiver Module



  • 4 CWDM lanes Mux/Demux design
  • Up to 11.1Gbps Data rate per wavelength
  • Up to 10km transmission on SMF
  • Electrically hot-pluggable
  • Digital Diagnostics Monitoring Interface
  • Compliant with QSFP+ MSA with LC connector
  • Case operating temperature range:0°C to 70°C
  • Power dissipation < 3.5 W


  • 40G Ethernet
  • Data Center and LAN


  • Compliant to IEEE 802.3ba
  • Compliant to SFF-8436
  • RoHS Compliant.




General Description

E-LINK QSFP+ LR4 is designed to operate over single-mode fiber system using 4X10 CWDM channel in 1310 band and links up to 10km. The module converts 4 inputs channel of 10Gb/s electrical data to 4 CWDM optical signals, and multiplexes them into a single channel for 40Gb/s optical transmission. Reversely, on the receiver side, the module optically de-multiplexes a 40Gb/s input into 4 CWDM channels signals, and converts them to 4 channel output electrical data.

The central wavelengths of the 4 CWDM channels are 1271, 1291, 1311 and 1331 nm. It contains a duplex LC connector for the optical interface and a 38-pin connector for the electrical interface. Single-mode fiber (SMF) is applied in this module. This product converts the 4-channel 10Gb/s electrical input data into CWDM optical signals (light), by a 4-wavelength Distributed Feedback Laser (DFB) array. The 4 wavelengths are multiplexed into a single 40Gb/s data, propagating out of the transmitter module via the SMF. The receiver module accepts the 40Gb/s optical signals input, and de-multiplexes it into 4 CWDM 10Gb/s channels. Each wavelength light is collected by a discrete photo diode, and then outputted as electric data after amplified by a TIA.

The product is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP+ Multi-Source Agreement (MSA) and compliant to 40G QSFP+ LR4 of IEEE 802.3ba.


Absolute Maximum Ratings

Parameter Symbol Min. Typ. Max. Unit Note
Storage Temperature Ts -40 - 85 ºC  
Relative Humidity RH 5 - 95 %  
Power Supply Voltage VCC -0.3 - 4 V  
Signal Input Voltage   Vcc-0.3 - Vcc+0.3 V  



Recommended Operating Conditions

Parameter Symbol Min. Typ. Max. Unit Note
Case Operating Temperature Tcase 0 - 70 ºC Without air flow
Power Supply Voltage VCC 3.13 3.3 3.47 V  
Power Supply Current ICC -   900 mA  
Data Rate BR   10.3125   Gbps Each channel
Transmission Distance TD   - 10 km  
Coupled fiber Single mode fiber 9/125um SMF

Optical Characteristics

Parameter Symbol Min Typ Max Unit NOTE
Wavelength Assignment λ0 1264.5 1271 1277.5 nm  
λ1 1284.5 1291 1297.5 nm  
λ2 1304.5 1311 1317.5 nm  
λ3 1324.5 1331 1337.5 nm  
Total Output. Power POUT     8.3 dBm  
Average Launch Power Per lane   -7   2.3 dBm  
Spectral Width (-20dB) σ     1 nm  
SMSR   30     dB  
Optical Extinction Ratio ER 3.5     dB  
Average launch Power off per lane Poff     -30 dBm  
Transmitter and Dispersion Peanlty TDP     2.3 dB  
RIN RIN     -128 dB/Hz  
Output Eye Mask Compliant with IEEE 802.3ba  
Rx Sensitivity per lane(OMA) RSENS     -11.5 dBm 1
Input Saturation Power (Overload) Psat 3.3     dBm  
Receiver Reflectance Rr     -26 dB  


  1. Measured with a PRBS 231-1 test pattern, @10.325Gb/s, BER<10-12 .
    1. Electrical Characteristics
Parameter Symbol Min Typ Max Unit NOTE
Supply Voltage Vcc 3.14 3.3 3.46 V  
Supply Current Icc     900 mA  
Input differential impedance Rin   100   Ω 1
Differential data input swing Vin,pp 180   1000 mV  
Transmit Disable Voltage VD Vcc–1.3   Vcc V  
Transmit Enable Voltage VEN Vee   Vee+ 0.8 V 2
Transmit Disable Assert Time       10 us  
Differential data output swing Vout,pp 300   850 mV 3
Data output rise time tr 28     ps 4
Data output fall time tf 28     ps 4
LOS Fault VLOS fault Vcc–1.3   VccHOST V 5
LOS Normal VLOS norm Vee   Vee+0.8 V 5
Power Supply Rejection PSR 100     mVpp 6


  1. Connected directly to TX data input pins. AC coupled thereafter.
  2. Or open circuit.
  3. Into 100 ohms differential termination.
  4. 20 – 80 %.
  5. Loss Of Signal is LVTTL. Logic 0 indicates normal operation; logic 1 indicates no signal detected.
  6. Receiver sensitivity is compliant with power supply sinusoidal modulation of 20 Hz to 1.5 MHz up to specified value applied through the recommended power supply filtering network.



Figure 1---Pin out of Connector Block on Host Board



Pin Symbol Name/Description NOTE
1 GND Transmitter Ground (Common with Receiver Ground) 1
2 Tx2n Transmitter Inverted Data Input  
3 Tx2p Transmitter Non-Inverted Data output  
4 GND Transmitter Ground (Common with Receiver Ground) 1
5 Tx4n Transmitter Inverted Data Input  
6 Tx4p Transmitter Non-Inverted Data output  
7 GND Transmitter Ground (Common with Receiver Ground) 1
8 ModSelL Module Select  
9 ResetL Module Reset  
10 VccRx 3.3V Power Supply Receiver 2
11 SCL 2-Wire serial Interface Clock  
12 SDA 2-Wire serial Interface Data  
13 GND Transmitter Ground (Common with Receiver Ground)  
14 Rx3p Receiver Non-Inverted Data Output  
15 Rx3n Receiver Inverted Data Output  
16 GND Transmitter Ground (Common with Receiver Ground) 1
17 Rx1p Receiver Non-Inverted Data Output  
18 Rx1n Receiver Inverted Data Output  
19 GND Transmitter Ground (Common with Receiver Ground) 1
20 GND Transmitter Ground (Common with Receiver Ground) 1
21 Rx2n Receiver Inverted Data Output  
22 Rx2p Receiver Non-Inverted Data Output  
23 GND Transmitter Ground (Common with Receiver Ground) 1
24 Rx4n Receiver Inverted Data Output 1
25 Rx4p Receiver Non-Inverted Data Output  
26 GND Transmitter Ground (Common with Receiver Ground) 1
27 ModPrsl Module Present  
28 IntL Interrupt  
29 VccTx 3.3V power supply transmitter 2
30 Vcc1 3.3V power supply 2
31 LPMode Low Power Mode  
32 GND Transmitter Ground (Common with Receiver Ground) 1
33 Tx3p Transmitter Non-Inverted Data Input  
34 Tx3n Transmitter Inverted Data Output  
35 GND Transmitter Ground (Common with Receiver Ground) 1
36 Tx1p Transmitter Non-Inverted Data Input  
37 Tx1n Transmitter Inverted Data Output  
38 GND Transmitter Ground (Common with Receiver Ground) 1


1. GND is the symbol for signal and supply (power) common for QSFP+ modules. All are common within the QSFP+ module and all module voltages are referenced to this potential unless otherwise noted. Connect these directly to the host board signal common ground plane.

2. VccRx, Vcc1 and VccTx are the receiving and transmission power suppliers and shall be applied concurrently. Recommended host board power supply filtering is shown below. Vcc Rx, Vcc1 and Vcc Tx may be internally connected within the QSFP+ transceiver module in any combination. The connector pins are each rated for a maximum current of 500mA.






















  1. Digital Diagnostic Functions

E-LINK LNK-QSFP-LR support the 2-wire serial communication protocol as defined in the QSFP+ MSA. which allows real-time access to the following operating parameters:

  • Transceiver temperature
  • Laser bias current
  • Transmitted optical power
  • Received optical power
  • Transceiver supply voltage

It also provides a sophisticated system of alarm and warning flags, which may be used to alert end-users when particular operating parameters are outside of a factory-set normal range.

The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed through the 2-wire serial interface. When the serial protocol is activated, the serial clock signal (SCL pin) is generated by the host. The positive edge clocks data into the QSFP+ transceiver into those segments of its memory map that are not write-protected. The negative edge clocks data from the QSFP+ transceiver. The serial data signal (SDA pin) 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. The 2-wire serial interface provides sequential or random access to the 8 bit parameters, addressed from 000h to the maximum address of the memory.

This clause defines the Memory Map for QSFP transceiver used for serial ID, digital monitoring and certain control functions. The interface is mandatory for all QSFP devices. The memory map has been changed in order to accommodate 4 optical channels and limit the required memory space. The structure of the memory is shown in The memory space is arranged into a lower, single page, address space of 128 bytes and multiple upper address space pages. This structure permits timely access to addresses in the lower page, e.g. Interrupt Flags and Monitors. Less time critical entries, e.g. serial ID information and threshold settings, are available with the Page Select function. The structure also provides address expansion by adding additional upper pages as needed. For example, in  upper pages 01 and 02 are optional. Upper page 01 allows implementation of Application Select Table, and upper page 02 provides user read/write space. The lower page and upper pages 00 and 03 are always implemented. The interface address used is A0xh and is mainly used for time critical data like interrupt handling in order to enable a “one-time-read” for all data related to an interrupt situation. After an Interrupt, IntL, has been asserted, the host can read out the flag field to determine the effected channel and type of flag.

For more detailed information including memory map definitions, please see the QSFP+ MSA Specification.


Contact Details
E-link China Technology Co., Ltd.

Contact Person: Mr. Michael Guo

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Fax: 86-755-8312-8674

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