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OEM 100GBASE-ER4 QSFP28 long-haul optical transceiver with red pull-tab, 40km single-mode LC interface for core routing interconnects.

Custom 100GBASE-ER4 QSFP28 Transceiver (ER4 & ER4L)

  • Unamplified MAN Backbone: Maintains absolute signal integrity across 40km of single-mode fiber without relying on mid-span Erbium-Doped Fiber Amplifiers (EDFA).

  • Cost-Scaled ER4-Lite: WolonFiber produces an ER4L (Lite) configuration precisely tuned for 30km links, protecting CapEx on mid-range optical budgets.

  • LAN-WDM Accuracy: Operates on four densely packed channels (1295.56nm to 1309.14nm) adjacent to the zero-dispersion window.

  • Dual-Rate OTU4 Execution: EEPROM can be factory-programmed to recognize both 100GbE (103.1Gbps) and telecom OTU4 (112Gbps) transport framing.

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Product Description

Securing optical transport across 40-kilometer metropolitan rings demands precise thermal and dispersion management. The 100GBASE-ER4 module integrates cooled Electro-absorption Modulated Lasers (EML) alongside Avalanche Photodiodes (APD) to capture heavily attenuated photons. For networks with spans strictly under 30 kilometers, WolonFiber fabricates the ER4-Lite (ER4L) equivalent. This provides network operators the exact physical performance of the ER4 standard at a lowered thermal threshold and manufacturing cost.

Key Features

  • Active TEC Cooling: Thermo-Electric Coolers lock the specific LAN-WDM laser wavelengths, preventing channel drift caused by continuous high-power operation.

  • APD Sensitivity: The avalanche multiplication effect within the receiver decodes weak optical signals down to < -20.5dBm.

  • EMI Integrity: Built with heavy-duty metal enclosures to suppress electromagnetic interference within dense carrier routing facilities.

Application Scenarios

  • Direct interconnects between municipal switching centers lacking inline optical repeaters.

  • Client-side mapping into telecom Optical Transport Networks (OTN) using native 112Gbps signaling.

Technical Specifications

Specification Details Specification Details
Form Factor QSFP28 Vendor Name WolonFiber
Data Rate 103.1Gbps & 112Gbps (Dual-Rate) Wavelength 4-Lane LAN-WDM
Distance Options 30km (ER4-Lite) / 40km (ER4) Connector Duplex LC
Media Type SMF Transmitter Cooled EML
Receiver APD TX Power -2.5 to 2.9dBm (ER4 spec)
RX Sensitivity < -20.5dBm Power Budget Approx. 18dB (No FEC)
Power Draw ≤ 4.5W Operating Temp 0 to 70°C (32 to 158°F)
Host FEC ER4L (Required for 40km) Protocols 100GBASE-ER4, QSFP28 MSA

Engineering FAQs

  • Q: What strictly differentiates the ER4 from the ER4-Lite?

    A: The standard ER4 guarantees a 40km reach regardless of FEC implementation. The ER4-Lite (ER4L) is calibrated to reach 30km without Host FEC, or 40km if the host switch engages FEC, featuring slightly relaxed receiver tolerances.

  • Q: Are optical attenuators necessary for bench configurations?

    A: Yes. The APD receiver array is highly vulnerable to optical saturation. Patching these modules on links with less than 10dB of natural insertion loss requires physical inline attenuators.

  • Q: Are these units tested for long-haul error rates?

    A: Every ER4 and ER4L manufactured by WolonFiber is subjected to Bit Error Rate (BER) analysis over spooled 40km fiber beds prior to packaging.

  • Q: Can this unit optically link with a CWDM4 transceiver?

    A: No. CWDM4 utilizes 20nm wavelength spacing. The ER4 uses ~4.5nm LAN-WDM spacing. The optical grids do not intersect properly.

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