40G QSFP+ LR4 transceiver

40G QSFP+ LR4 transceiver

single mode QSFP+ LR4 fiber module

  • Description
  • Inquiry

40Gb/s 10km QSFP+ LR4 Transceiver


 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

QSFP+ LR4 FF-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. Singlemode

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.

QSFP+ LR4 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


Absolute Maximum Ratings

Storage TemperatureTs-4085ºC
Storage Ambient HumidityHA595%
Operating Relative HumidityRH85%
Power Supply VoltageVCC-0.34V
Signal Input VoltageVcc-0.3Vcc+0.3V

Recommended Operating Conditions

Parameter  Symbol  Min.  Typ.  Max.  Unit  Note
 Case Operating Temperature Tcase 0 – 70 ºC Without air flow
 Power Supply Voltage VCC 3.14 3.3 3.47 V
 Power Supply Current ICC – 800 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 760 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.


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