QSFP-DD 400GE FR4 2 km Optical Transceiver Module

QSFP-DD 400GE FR4 2 km Optical Transceiver Module


ETSC’s OM3660FX102 is a transceiver module designed for 2 km optical communication applications, and it is compliant with 100G Lambda MSA standard. This module can convert 8-channel 53.125 Gbit/s electrical data to 4-channel 106.25 Gbit/s optical signals, and multiplex them into a single channel for 425 Gbit/s optical transmission. Similarly, it optically de-multiplexes a 425 Gbit/s input into 4- channel signals, and converts them to 8-channel output electrical data on the receiver side. It has been designed 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.


  • QSFP-DD MSA rev5.0 compliant
  • 100G Lambda MSA compliant
  • 802.3cu compliant
  • 400GE FR4 specification compliant
  • QSFP-DD CMIS4.0 Management interface compliant
  • Non-hermetic package design
  • 4 CWDM lanes MUX/DEMUX design
  • 8 x 53.125 Gbit/s PAM4 electrical interface (400GAUI-8)
  • Maximum power consumption 12 W
  • LC duplex connector
  • 425 Gbit/s aggregate bit rate
  • Up to 2 km transmission on single mode fiber with FEC
  • Single 3.3 V power supply
  • RoHS-2 compliant


  • Data center interconnect

Absolute Maximum Ratings

It has to be noted that the operation in excess of any individual absolute maximum ratings might cause permanent damage to this module.

Parameter Symbol Min Typ Max Unit Notes
Maximum Supply Voltage Vcc -0.3 3.3 3.6 V
Storage Temperature Ts -40 85
Relative Humidity RH 0 85 %

Operating Environments

Electrical and optical characteristics below are defined under this operating environment, unless otherwise specified.

Parameter Symbol Min Typ Max Unit
Supply Voltage Vcc 3.135 3.3 3.465 V
Case Temperature T 0 70
Data Rate Accuracy -100 100 ppm
Link Distance 0.5 2000 m

Electrical Characteristics

Parameter Min Typ Max Unit Note
Power dissipation 12 W
Supply current 3.63 A
Receiver (module input)
Data Rate, each lane 26.5625 ± 100 ppm GBd
Overload Differential Voltage pk-pk 900 mV
Common Mode Voltage -350 2850 mV
Differential Termination Resistance  Mismatch 10 % At 1 MHz
Differential Return Loss (SDD11) Equation (16-1) dB OIF-CEI-56G-  VSR-PAM4
Common Mode to Differential Mode  Conversion (SCD11) Equation (16-3) dB OIF-CEI-56G-  VSR-PAM4
Stressed Input Test See OIF-CEI-56G-VSR-PAM4 Section
Transmitter (module output)
Data Rate, each lane 26.5625 ± 100 ppm GBd
Differential Voltage, pk-pk 900 mV
Common Mode Voltage (Vcm) -350 2850 mV
Common Mode Noise, RMS 17.5 mV
Differential Termination Resistance  Mismatch 10 % At 1 MHz
Differential Return Loss (SDD22) Equation  (16-1) dB
Common Mode to Differential Mode  Conversion (SDC22) Equation  (16-3) dB
Common Mode Return Loss  (SCC22) -2 dB From 250 MHz  to fb GHz
Transition Time 9.5 ps
Near-end Eye Width at 10-6 proba-  bility (EW6) 0.265 UI
Near-end Eye Height at 10-6 prob-  ability (EH6) 70 mV
Far-end Eye Width at 10-6 proba-  bility (EW6) 0.20 UI
Far-end Eye Height at 10-6 proba-  bility (EH6) 30 mV
Near-end Eye Linearity 0.85

Optical Characteristics

Parameters Unit min. type. max
Data Rate, each Lane GBd 53.125 ± 100 ppm
Modulation Format PAM4
Line wavelengths nm 1264.5 1271 1277.5
1284.5 1291 1297.5
1304.5 1311 1317.5
1324.5 1331 1337.5
Total Average Launch Power dBm 9.5
Average Launch Power, each lane dBm -3.3 3.5
Optical Modulation Amplitude  (OMA), each lane dBm -0.2 3.7
Extinction Ratio (ER) dB 3.5
Side-Mode Suppression Ratio  (SMSR) dB 30
Launch power in OMA minus  TDECQ, each lane, for ER≥4.5 dB dB -1.7
Launch power in OMA minus  TDECQ, each lane, for ER <4.5 dB dBm -1.6
Transmitter and Dispersion Eye Clo-  sure for PAM4, each Lane (TDECQ) dB 3.4
Difference in Launch Power between  any Two Lanes (OMA outer) dB 4
RIN17.1OMA dB/Hz -136
Optical Return Loss Tolerance dB 17.1
Transmitter Reflectance dB -26
Average Launch Power of OFF  Transmitter, each Lane dBm -20
Data Rate, each Lane GBd 53.125 ± 100 ppm
Modulation Format PAM4
Damage Threshold, each lane dBm 4.5
Line wavelengths nm 1264.5 1271 1277.5
1284.5 1291 1297.5
1304.5 1311 1317.5
1324.5 1331 1337.5
Average receiver power, each lane dBm -7.3 3.5
Receiver power, each lane (OMA) dBm 3.7
Difference in Receiver Power be-  tween any Two Lanes (OMA) dB 4.1
Receiver Sensitivity (OMA outer) ,  each lane (max) dBm See Note
LOS Assert dBm -20
LOS Deassert dBm -8.6
LOS Hysteresis dB 0.5
Receiver reflectance dB -26
Conditions of stressed receiver sensitivity
Stressed eye closure for PAM4  (SECQ), lane under test dB 0.9 3.4
OMA outer of each aggressor lane dBm 1.5
Long term performance test
BER FLOOR 1E – 6 @ -3.1 ~ 2 dBm
  1. Measured with conformance test signal for BER = 2.4 x 10 – 4. A compliant receiver shall have stressed receiver sensitivity (OMA outer), each lane values below the mask of Figure 3, for SECQ values between 0.9 and 3.4 dB.