Custom 100G QSFP28 Single Lambda Transceiver (DR/FR/LR)

Product Description

Transitioning to 400G infrastructures necessitates backward-compatible 100G edge optics. Standard 100GBASE-LR4 modules multiplex four separate wavelengths, rendering them optically incompatible with 400G ports. The Single Lambda QSFP28 resolves this by utilizing PAM4 encoding over a single 1310nm wavelength. Procured directly from WolonFiber's manufacturing base, this transceiver enables network engineers to patch 100G leaf switches directly into next-generation 400G spine routers without signal mismatches.

Key Features

• Host FEC Dependency: Decoding complex PAM4 signals requires the host switch port to actively support and enforce KP4 Forward Error Correction (FEC).

• Thermal Footprint: Eliminating three localized lasers drops the aggregate power dissipation below 3.5W, well within standard QSFP28 thermal thresholds.

• MSA Memory Flashing: EEPROM data is custom-written prior to dispatch, preventing proprietary operating systems (such as Cisco NX-OS or Juniper Junos) from disabling the port.

Application Scenarios

• Leaf-to-Spine uplinks funneling 100GbE traffic into centralized 400G PAM4 core routers.

• High-density single-mode data halls requiring reduced power consumption per 100G port.

Technical Specifications

Engineering FAQs

• Q: Can this transceiver establish a link with a standard 100GBASE-LR4?

  A: No. A 100GBASE-LR4 transmits four distinct 25G NRZ wavelengths. This module uses one 100G PAM4 wavelength. The optical formats cannot handshake.

• Q: How is the physical connection made to a 400G switch?

  A: A 400GBASE-DR4 module is placed in the core switch. An MPO-to-4xLC single-mode breakout cable separates the 400G signal. The four LC ends connect to four individual 100G Single Lambda modules.

• Q: Does the DSP chip introduce latency?

  A: Yes. The mathematical PAM4 encoding/decoding process inside the DSP adds approximately 100-150 nanoseconds of latency compared to analog NRZ transceivers.

• Q: Is optical attenuation required for bench testing?

  A: For the DR (500m) variant, the maximum transmit power usually sits below the receiver overload limit, but technicians must verify exact optical metering before back-to-back patching.