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Single-mode optical module interface

Fiber and communications infrastructure knowledge brief Published 07 Feb 2023

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

Single-mode optical modules typically use LC connectors and operate over a 9 µm core fiber at 1310 nm or 1550 nm wavelengths for long-distance transmission. Fiber and Core CharacteristicsSingle-mode optical modules are designed for long-distance, high-speed communication. They use a narrow fiber core of about 9 µm with a 125 µm cladding, allowing light to travel in a single mode with minimal dispersion and attenuation.

This enables transmission distances ranging from 2 km up to 120 km, depending on the module type and wavelength. Common wavelength standards include 1310 nm and 1550 nm, with some modules supporting CWDM or DWDM wavelengths for extended reach.

Connector Types

The physical interface of single-mode modules is most commonly the LC connector, which is compact and supports high-density deployments. Legacy networks may use SC connectors, while MPO/MTP connectors are reserved for high-density backbone applications. The connector type determines how the fiber physically couples with the transceiver and affects patch cable selection, insertion loss, and network scalability.

Module Form FactorsSingle-mode modules are available in various SFP form factors, including SFP, SFP+, and QSFP, which are hot-pluggable and compatible with switches, routers, and other network devices. Each form factor supports different data rates, such as 1G, 10G, 25G, 40G, and 100G, and must match the device port for proper operation. Transmission TypesSingle-mode modules can be dual-fiber (separate fibers for TX and RX) or single-fiber bidirectional (BIDI), which uses two wavelengths on a single fiber for transmit and receive.

Dual-fiber modules are widely supported and standard in most networks, while BIDI modules are useful for reducing fiber usage in constrained environments.

Summary

Fiber type: Single-mode (9 µm core, 125 µm cladding)Wavelengths: 1310 nm, 1550 nm, CWDM/DWDM optionsConnector type: LC (standard), SC (legacy), MPO/MTP (high-density)Form factors: SFP, SFP+, QSFPTransmission: Dual-fiber or single-fiber BIDIDistance: 2 km to 120 km depending on module and wavelength Using the correct single-mode module with compatible fiber and connector ensures minimal signal loss, reliable long-distance communication, and proper integration with network devices.

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Single-mode optical module interface

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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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