100G PAM4 DWDM QSFP28 ZR

100G PAM4 QSFP28 is a pluggable, DWDM, fiber-optic transceiver for 100 Gigabit Ethernet (100GbE) applications.

This module is designed for the data centers to interconnect, which requires high fiber capacity for links up to 80 km.

The optical interface utilizes two DWDM wavelengths on a 50 GHz grid. PAM4 modulation format is used to increase capacity enabling 50 Gb/s on each wavelength. Integrated, high-gain FEC (Forward Error Correction) and advanced Rx ADC/DSP technology enables optical reaches up to 80 km over an amplified, DWDM line system. The optical signals are transmitted and receive from the module by standard duplex SMF and LC receptacles.

Electrical signals are transmitted and received from the host via a standard, 38-pin connector described in the QSFP28 MSA (SFF-8679). The electrical interface is CAUI-4 compliant (IEEE P802.3bm Annex 83E), splitting the 100 Gb/s signals into four, parallel, 25 Gb/s NRZ streams.

This module incorporates Inphi’s innovative, silicon photonics circuit, arrayed modulation driver,arrayed TIA and advanced DSP technology to provide high performance in a miniature, pluggable package.

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  Key Features

  • Compatible with the QSFP28 MSA as described in SFF-8665
  • 100Gb/s over 2 wavelengths on a 50 GHz DWDM grid enabling 4Tb/s over a single fiber
  • PAM4 modulation format enabling 56Gb/s on a single wavelength
  • 80km reach over a duplex, SMF
  • Integrated, high-gain FEC encode / decode
  • Advanced ADC/DSP receiver technology
  • Optical and host loopback functionality
  • Standard CAUI4 electrical interface
  • Adaptive equalization (CTLE) on transmit-side electrical input and adjustable output de-emphasis (3 tap FIR filter) to compensate for losses on host
  • Typical power consumption of 4.5W
  • 2-wire management interface with extended digital diagnostic monitoring and alarm functions

100G PAM4 DWDM Solution Diagram

Transmitter Optical Characteristics

Parameter Comment Min Typ Max Unit
Signaling Rate, each lane Rate=25.78913Gb/s+FEC OH(~9%)*2(PAM4) Typ

-100 ppm

56.25 Typ

+100 ppm

Gb/s
Wavelength Check the wavelength table nm
Frequency Control Frequency control loop used to optimize link performance. Mix/max limits indicate control loop range. λc – 12 N/A λc + 12 GHz
Center Wavelength Spacing Wavelength/lane 1-2 spacing N/A 50 N/A GHz
Extinction Ratio N/A 6 N/A dB
SMSR 30 N/A N/A dB
Average Launch Power, per lane -11 -10 -8 dBm
Dispersion Tolerance Residual dispersion (RD) after DCM -100 N/A +100 ps/nm
Average Launch Power of OFF

Transmitter, each lane

N/A N/A -30 dBm
Optical Return Loss Tolerance N/A N/A 20 dB
Transmitter Reflectance Defined looking into the transmitter N/A N/A -12 dB

 

Receiver Optical Characteristics

Parameter Comment Min Typ Max Unit
Signaling Rate, each lane Rate=25.78913Gb/s+FEC OH(~9%)*2(PAM4) Typ

-100 ppm

56.25 Typ

+100 ppm

Gb/s
Wavelength Check the wavelength table nm
Damage Threshold Frequency control loop used to optimize link performance. Mix/max limits indicate control loop range. 10 N/A N/A dBm
Receiver Power, each lane -2.0 N/A 6.0 dBm
Receiver Reflectance N/A N/A -20 dB
Required OSNR 31 N/A N/A dB
LOSS asserted threshold-OMA -10 N/A N/A dBm
LOSS de-asserted threshold-OMA N/A N/A -3 dBm
LOS Hysteresis N/A 1.0 N/A dB

Notes:

1, The receiver shall be able to tolerate, without damage, continuous exposure to an optical input signal below this average power level

2, Module receiver LOS characteristics are realized by monitoring the DC current of the high-speed photodiodes. Preliminary LOS threshold limits are shown in the table

Wavelength Selection Table

 Channel No. 100GHz Grid Channel No. 100GHz Grid
D20 192.00 D40 194.00
D21 192.10 D41 194.10
D22 192.20 D42 194.20
D23 192.30 D43 194.30
D24 192.40 D44 194.40
D25 192.50 D45 194.50
D26 192.60 D46 194.60
D27 192.70 D47 194.70
D28 192.80 D48 194.80
D29 192.90 D49 194.90
D30 193.00 D50 195.00
D31 193.10 D51 195.10
D32 193.20 D52 195.20
D33 193.30 D53 195.30
D34 193.40 D54 195.40
D35 193.50 D55 195.50
D36 193.60 D56 195.60
D37 193.70 D57 195.70
D38 193.80 D58 195.80
D39 193.90 D59 195.90

Support Documents

Item Type Version Release Date
FR8000-PAM4-ZR_specifications
488 KB
100G DWDM Connectivity v2.0
339 KB
PAM4 or Coherent_support
642 KB
All you want to know 100G Optical Transeiver
812 KB

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