Custom 100GBASE-LR4 QSFP28 Optical Transceiver

Product Description

The 100GBASE-LR4 QSFP28 module is the definitive component for Metropolitan Area Networks (MAN) and inter-facility links. It achieves 10-kilometer transmission over a Duplex LC interface by multiplexing four 25Gbps signals onto closely spaced LAN-WDM wavelengths. WolonFiber programs this specific module with Dual-Rate EEPROM coding, granting telecom operators the flexibility to deploy it in standard Ethernet switches or OTN (Optical Transport Network) client-side interfaces running 112G OTU4 protocols without carrying separate hardware inventory.

Key Features

• Zero Dispersion Region: The LAN-WDM lasers operate adjacent to the 1310nm zero-dispersion window of silica glass, maintaining absolute signal integrity over 10km.

• Protocol Versatility: Firmware flawlessly executes both IEEE 802.3ba 100GBASE-LR4 and ITU-T G.959.1 OTU4 hardware handshakes.

• Precision Receiver: Highly calibrated PIN photodetector array accurately demultiplexes the tight ~4.5nm channel spacing.

Application Scenarios

• Long-distance core router interconnections across 10km metropolitan rings.

• Telecom carrier Optical Transport Networks (OTN) requiring native OTU4 112Gbps client-side mapping.

Technical Specifications

Engineering FAQs

• Q: Why does the 100gbase-lr4 use LAN-WDM instead of CWDM?

  A: LAN-WDM spaces the four wavelengths very closely together (~4.5nm apart) near 1310nm. This tight grouping ensures all four lanes experience near-zero chromatic dispersion over 10km, which is impossible with the widely spaced 20nm CWDM grid.

• Q: How does the Dual-Rate function work for 112g otu4?

  A: WolonFiber programs the MSA memory map to broadcast support for both 103.1Gbps (Ethernet) and 111.8Gbps (OTU4). The host OTN transponder or router will read the EEPROM and set the specific clock rate accordingly.

• Q: Can this 100g qsfp28 lr4 operate on a 2km link?

  A: Yes. The transmit power (-4.3 to 4.5dBm) is perfectly balanced. It will not overload the receiver even if deployed on a short 10-meter patch cord.

• Q: Does this module require Host FEC to function?

  A: Unlike CWDM4 or SR4, the standard IEEE 100GBASE-LR4 specification is robust enough to operate without Forward Error Correction (FEC) over 10km links. However, OTU4 applications inherently utilize FEC at the protocol layer.