40G QSFP ER4 Fiber Optic Transceiver

The QSFP+-40G-ER4 is a transceiver module designed for 40Km optical communication applications. The design is compliant to 40GBASE-ER4 of the IEEE P802.3ba standard. The huihongfiber module converts 4 inputs channels (ch) 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.

40G QSFP ER4 Fiber Optic Transceiver Features:

4 CWDM lanes MUX/DEMUX design
Up to 11.2Gbps per channel bandwidth
Aggregate bandwidth of > 40Gbps
Duplex LC connector
Compliant with 40G Ethernet IEEE802.3ba and 40GBASE-ER4 Standard
QSFP MSA compliant
Up to 40km transmission
Compliant with QDR/DDR Infiniband data rates
Single +3.3V power supply operating
Built-in digital diagnostic functions
Temperature range 0°C to 70°C
RoHS Compliant

40G QSFP ER4 Fiber Optic Transceiver Applications:

Rack to rack
Data centers Switches and Routers
Metro networks
Switches and Routers
40G BASE-ER4 Ethernet Links

The central wavelengths of the QSFP+-40G-ER4 4 CWDM channels are 1271, 1291, 1311 and 1331 nm as members of the CWDM wavelength grid defined in ITU-T G694.2. It contains a duplex LC connector for the optical interface and a 38-pin connector for the electrical interface. To minimize the optical dispersion in the long-haul system, single-mode fiber (SMF) has to be applied in this module.

The QSFP+-40G-ER4 is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP Multi-Source Agreement (MSA). It has been designed to meet the harshest external operating conditions including temperature, humidity and EMI interference.

The QSFP+-40G-ER4 module operates from a single +3.3V power supply and LVCMOS/LVTTL global control signals such as Module Present, Reset, Interrupt and Low Power Mode are available with the modules. A 2-wire serial interface is available to send and receive more complex control signals and to obtain digital diagnostic information. Individual channels can be addressed and unused channels can be shut down for maximum design flexibility.

The QSFP+-40G-ER4 is designed with form factor, optical/electrical connection and digital diagnostic interface according to the QSFP Multi-Source Agreement (MSA). It has been designed by huihongfiber to meet the harshest external operating conditions including temperature, humidity and EMI interference. The module offers very high functionality and feature integration, accessible via a two-wire serial interface.

  • Absolute Maximum Ratings
Storage TemperatureTS-40+85°C
Supply VoltageVCCT, R-0.54V
Relative HumidityRH085%
  • Recommended Operating Environment:
Case operating TemperatureTC0+70°C
Supply VoltageVCCT, R+3.133.3+3.47V
Supply CurrentICC1100mA
Power DissipationPD3.5W
  • Electrical Characteristics (TOP = 0 to 70 °C, VCC = 3.13 to 3.47 Volts
Data Rate per Channel10.312511.2Gbps
Power Consumption2.53.5W
Supply CurrentIcc0.751.0A
Control I/O Voltage-HighVIH2.0VccV
Control I/O Voltage-LowVIL00.7V
Inter-Channel SkewTSK150Ps
RESETL Duration10Us
RESETL De-assert time2000ms
Power On Time2000ms
Single Ended Output Voltage Tolerance0.34V1
Common mode Voltage Tolerance15mV
Transmit Input Diff VoltageVI1501200mV
Transmit Input Diff ImpedanceZIN85100115
Data Dependent Input JitterDDJ0.3UI
Single Ended Output Voltage Tolerance0.34V
Rx Output Diff VoltageVo370600950mV
Rx Output Rise and Fall VoltageTr/Tf35ps1
Total JitterTJ0.3UI


  1. 20~80%
  • Optical Parameters(TOP = 0 to 70 °C, VCC = 3.13 to 3.47 Volts)


Wavelength Assignment

Side-mode Suppression RatioSMSR30dB
Total Average Launch PowerPT+10.5dBm
Average Launch Power, each Lane-2.7+4.5dBm
Difference in Launch Power between any two Lanes (OMA)4.7dB
Optical Modulation Amplitude, each LaneOMA0.3+5dBm
Launch Power in OMA minus Transmitter and Dispersion Penalty (TDP), each Lane-0.5dBm
TDP, each LaneTDP2.6dB
Extinction RatioER3.5dB
Transmitter Eye Mask Definition {X1, X2, X3, Y1, Y2, Y3}{0.25, 0.4, 0.45, 0.25, 0.28, 0.4}
Optical Return Loss Tolerance20dB
Average Launch Power OFF Transmitter, each LanePoff-30dBm
Relative Intensity NoiseRin-128dB/HZ1
Damage ThresholdTHd3.8dBm1
Average Power at Receiver Input, each LaneR-21.2-4.5dBm
Receiver Power (OMA), each Lane-1dB
RSSI Accuracy-22dB
Receiver ReflectanceRrx-26dB
Receiver Power (OMA), each Lane3.5dBm
Stressed Receiver Sensitivity in OMA, each Lane-16.8dBm
Receiver Sensitivity(OMA), each LaneSen-19dBm
Difference in Receive Power between any two Lanes (OMA)7.0dB
Receive Electrical 3 dB upper Cutoff Frequency, each Lane12.3GHz
LOS De-AssertLOSD-20dBm
LOS AssertLOSA-35dBm
LOS HysteresisLOSH0.5dB


  1. 12dB Reflection
  • Diagnostic Monitoring Interface

Digital diagnostics monitoring function is available on all QSFP+ ER4. A 2-wire serial interface provides user to contact with module. The structure of the memory is shown in flowing. 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, such as Interrupt Flags and Monitors. Less time critical time entries, such as serial ID information and threshold settings, are available with the Page Select function. 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 affected channel and type of flag.