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.
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 |