Custom 200GBASE-LR4 Transceiver Series
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Metropolitan Reach: Delivers uncompromising 200Gbps bandwidth across 10-kilometer unamplified single-mode fiber links, forming the backbone of modern MAN (Metropolitan Area Network) rings.
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LAN-WDM Grid: Employs heavily stabilized LAN-WDM laser channels (1295.56nm to 1309.14nm) to virtually eradicate chromatic dispersion over mid-range SMF.
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Dual Form Factor Options: Available in standard QSFP56 (4x50G PAM4) or high-density QSFP-DD (2x100GBASE-LR4) footprints to match varying host ASIC capabilities.
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Hardware Redundancy: The specialized 2x100G QSFP-DD variant utilizes dual CS or LC connectors, enabling physical layer routing redundancy from a single host switch port.
Product Description
Engineered to bridge inter-facility data centers and municipal routing nodes, the 200GBASE-LR4 series provides deterministic optical performance over 10km of OS2 glass. Rather than relying on coarsely spaced CWDM, this series utilizes narrow-linewidth cooled EML lasers operating on the LAN-WDM grid. This tight wavelength spacing ensures that high-frequency 50G PAM4 pulses arrive at the receiver without signal degradation. Fabricated within WolonFiber’s cleanrooms, these modules bypass standard distributor constraints, offering customizable EEPROM flashing for rigid OEM environments.
Key Features
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Active Thermal Control: Thermo-Electric Coolers (TEC) are integrated directly into the transmitter sub-assembly to lock the precise output wavelength under fluctuating external temperatures.
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Low-Loss Optical Multiplexing: Internal MUX/DEMUX components are meticulously calibrated to keep the insertion loss minimal, maximizing the 10km power budget.
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Dual-Link Scalability: The QSFP-DD 2*LR4 version physically splits the 200G payload into two independent 100Gbps MAC instances, operating as a high-speed aggregation hub.
Application Scenarios
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Inter-building data synchronization pipelines across expansive technology campuses.
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Core router aggregation links for Internet Service Providers (ISPs) spanning up to 10 kilometers.
Technical Specifications
| Specification | Details | Specification | Details |
| Form Factor | QSFP56 or QSFP-DD | Vendor Name | WolonFiber |
| Max Data Rate | 212.5Gbps | Modulation | 4x 50G PAM4 |
| Wavelength | LAN-WDM (1295-1309nm) | Max Cable Distance | 10km |
| Connector | Duplex LC (or Dual CS for 2x100G) | Media Type | SMF (Single-Mode) |
| Transmitter Type | Cooled LAN-WDM EML | Receiver Type | PIN Array |
| TX Power | -4.3 to 4.5dBm | RX Sensitivity | < -9.0dBm |
| Power Consumption | ≤ 7.0W | Operating Temp | 0 to 70°C (32 to 158°F) |
| Host FEC | KP4 FEC (Required) | Protocols | 200G LR4 MSA, IEEE 802.3bs |
Engineering FAQs
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Q: What is the fundamental difference between the QSFP56 LR4 and the QSFP-DD 2x100G LR4?
A: The QSFP56 module transmits a single 200G stream over one Duplex LC fiber pair. The QSFP-DD 2x100G variant houses two independent 100GBASE-LR4 MACs in one chassis, connecting to two separate fiber pairs (via dual LC or CS connectors) for hardware-level splitting and redundancy.
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Q: Why are LAN-WDM lasers required for a 10km link?
A: Standard CWDM spacing (20nm) introduces too much chromatic dispersion for PAM4 signaling over 10km. LAN-WDM tightens the spacing to ~4.5nm near the 1310nm zero-dispersion window, preserving the signal eye diagram.
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Q: Can I loopback test this
200gbase lr4module without attenuators?A: Yes. The maximum transmit power (4.5dBm) does not exceed the receiver damage threshold. However, implementing a 3dB attenuator is best practice for lab stability.
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