Custom 100G QSFP28 CWDM4 Optical Transceiver

Product Description

The 100G QSFP28 CWDM4 transceiver is an MSA-compliant module built for hyperscale Data Center Interconnects (DCI). It multiplexes four 25Gbps optical signals into a single 100Gbps stream over OS2 single-mode fiber. Manufactured by WolonFiber's 400-employee workforce, this unit incorporates an uncooled CWDM DFB laser array and advanced DSP technology. This internal optimization guarantees strict power efficiency and signal stability across 2-kilometer inter-facility links, cutting down infrastructure costs significantly.

Key Features

• Uncooled DFB Lasers: Operates without active TEC cooling mechanisms, keeping the module's total power dissipation under 3.5W.

• Host FEC Requirement: To maintain zero bit-error-rate at the maximum 2km range, the host switch must enable Forward Error Correction (FEC).

• OEM Firmware Coding: Fully customized EEPROM ensures the module is natively recognized by specific vendor platforms without bypass commands.

Application Scenarios

• Hyperscale data center leaf-spine architectures.

• Intermediate single-mode interconnects (up to 2km) between adjacent campus buildings.

Technical Specifications

Engineering FAQs

• Q: Why choose the 100g cwdm4 over a 100G LR4 for a 1.5km link?
  A: The CWDM4 uses uncooled lasers and a wider wavelength grid, making it significantly cheaper to manufacture and more power-efficient (≤3.5W) than the LR4 (≤4.0W). If your link is strictly under 2km, the CWDM4 is the superior economic choice.

• Q: Can this 100g qsfp28 cwdm4 connect directly to a 100G PSM4 module?
  A: No. PSM4 uses four independent fibers at 1310nm via an MPO connector. CWDM4 multiplexes four different wavelengths onto a single Duplex LC fiber. They are physically and optically incompatible.

• Q: What happens if FEC is disabled on the host switch?
  A: Disabling Host FEC on a CWDM4 link approaching 2km will likely result in a high Bit Error Rate (BER) and dropped packets. FEC is a mandatory requirement of the CWDM4 MSA.

• Q: Does WolonFiber test these modules for wavelength drift?
  A: Yes. Every CWDM4 unit is subjected to rigorous optical spectrum analysis in our Wuhan facility to ensure the four uncooled DFB lasers remain perfectly locked within their 20nm grids.