Factory direct 200GBASE-ER4 QSFP56 optical module with orange pull-tab, 40km single-mode reach for provincial telecom backbone transport.

Custom 200GBASE-ER4 Extended Transport QSFP56

  • Unamplified Provincial Reach: Carrier-grade long-haul transport module engineered to sustain 200Gbps PAM4 signaling across 40km of dark fiber without inline amplification.

  • APD Integration: Houses an ultra-sensitive Avalanche Photodiode (APD) receiver array to detect severely attenuated photons surviving the 40km single-mode haul.

  • Extreme Optical Budget: Employs high-output cooled EML transmitters to establish a massive power budget capable of overcoming complex municipal splice losses.

  • Standard Footprint Adaptation: Condenses specialized long-haul optics into the widely adopted QSFP56 form factor, conserving rack space compared to legacy coherent hardware.

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Product Description

Routing 200Gbps payloads across 40-kilometer provincial backbones typically requires costly DWDM transponders and EDFA amplifiers. The Custom 200GBASE-ER4 QSFP56 transceiver directly eliminates this layer. By injecting heavily amplified optical signals into the LAN-WDM grid and utilizing APD multiplier effects on the receiving end, this direct-plug module achieves unamplified 40km reach. WolonFiber rigorously calibrates the internal DSPs of these units to suppress the inherent jitter and chromatic dispersion encountered on extreme-reach optical plants.

Key Features

  • Precision Thermal Engineering: Advanced metallic heat sinks rapidly draw heat away from the EML coolers, maintaining strict wavelength locking to prevent adjacent channel crosstalk.

  • High-Tolerance Signal Decoding: The internal DSP equalizes degraded optical waveforms before passing the 50G PAM4 electrical lanes to the host switch ASIC.

  • Vendor-Agnostic Provisioning: Shipped with customizable I2C memory mapping, enabling the module to bypass hardware rejections on heavily restricted telecom chassis.

Application Scenarios

  • Long-haul interconnects linking geographically separated enterprise data vault environments.

  • 5G carrier backhaul extending from dense urban centers to suburban distribution rings.

Technical Specifications

Specification Details Specification Details
Form Factor QSFP56 Vendor Name WolonFiber
Max Data Rate 212.5Gbps (4x 50G PAM4) Wavelength LAN-WDM (1295.56 to 1309.14nm)
Max Cable Distance 40km Connector Duplex LC
Media Type SMF Transmitter Cooled EML Array
Receiver Type APD TX Power 0.5 to 5.5dBm
RX Sensitivity < -18.5dBm Power Consumption ≤ 8.0W
Operating Temp 0 to 70°C (32 to 158°F) DDM/DOM Full I2C Telemetry
Host FEC KP4 FEC (Mandatory) Protocols 200G ER4 MSA, IEEE 802.3bs

Engineering FAQs

  • Q: Is this 200g er4 module compatible with standard 100G ER4 optics?

    A: No. Despite operating on the same LAN-WDM grid and using Duplex LC connectors, the 200G ER4 utilizes 50G PAM4 encoding, while the 100G ER4 relies on 25G NRZ encoding. They cannot optically synchronize.

  • Q: Why does this QSFP56 module consume up to 8.0W?

    A: Bridging 40km unamplified requires high-output lasers, active Thermo-Electric Coolers (TEC), high-bias APDs, and a heavy-duty DSP. Your host switch port must explicitly support Power Level 6 / 7 to initialize this optic.

  • Q: Are optical attenuators strictly necessary for bench testing?

    A: Yes. The APD receiver is highly sensitive and will sustain irreversible physical damage if subjected to the full 5.5dBm transmit power on a short patch cord. A minimum 10dB attenuator is mandatory for staging.

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