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Optical Module LR4

Fibre interconnection and data room reference Published 05 Dec 2025

Use this reference to prepare product questions for FD SOLUCIONES. Check interfaces, capacity, protection and installation requirements against the current product documentation.

An LR4 optical module is a long-range, four-channel transceiver designed for high-speed data transmission over single-mode fiber, typically supporting distances up to 10 kilometers. What LR4 MeansLR4 stands for "Long Range 4", where "Long Range" indicates the module is designed for extended-distance transmission over single-mode fiber (SMF), and the "4" denotes that it uses four separate optical channels to transmit data in parallel. Each channel typically carries 25 Gbps in a 100G LR4 module, combining to achieve a total data rate of 100 Gbps.

For 400G LR4 modules, the principle is similar but scaled to higher aggregate speeds using multiple lanes.

Technical Details

Wavelengths: LR4 modules use four distinct wavelengths (commonly 1295 nm, 1300 nm, 1305 nm, and 1310 nm) for bidirectional communication over a single fiber pair. Modulation: Most 100G LR4 modules use NRZ (Non-Return-to-Zero) modulation, which provides a higher signal-to-noise ratio, while newer single-lambda 100G LR modules may use PAM4 for more efficient bandwidth utilization. Transmission Distance: Typically up to 10 kilometers over standard single-mode fiber (OS2), making it suitable for metro, regional, and inter-data center connections.

Connectors: LR4 modules generally use duplex LC connectors for single-mode fiber connections. Multiplexing: The four channels are multiplexed at the transmitter and demultiplexed at the receiver, allowing a single fiber pair to carry multiple wavelengths simultaneously. ApplicationsLR4 optical modules are commonly used in scenarios requiring long-distance, high-bandwidth connections, such as: Interconnecting data centers within a metropolitan areaEnterprise network backbonesTelecom and service provider infrastructureHigh-speed links in campus or regional networks Comparison with Other ModulesSR4 (Short Range 4): Uses multimode fiber for short distances (up to 300 meters) and four parallel channels.

ER4 (Extended Range 4): Supports longer distances (up to 40 km) with higher optical power. FR4 (Fiber Range 4): Designed for intermediate distances, typically up to 2 km. In summary, LR4 modules are optimized for long-distance, high-speed optical transmission using four parallel channels over single-mode fiber, making them a standard choice for 100G and 400G Ethernet links where distance and reliability are critical.

Optical Module LR4 - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

Optical Module LR4

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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