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Dual-fiber LC interface fiber optic module

Optical access and telecom site reference Published 06 May 2025

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

Dual-fiber LC interface modules use two fibers—one for transmitting and one for receiving—to enable full-duplex optical communication in SFP, SFP+, and higher-speed transceivers.

Overview

A dual-fiber LC (Lucent Connector) interface integrates two fibers in a single compact connector housing, allowing one fiber to transmit (TX) and the other to receive (RX) optical signals simultaneously. This full-duplex design is standard for Ethernet and telecom optical links, supporting reliable bidirectional data transmission.

The L

C form factor uses a 1. 25 mm ceramic ferrule, which ensures precise fiber alignment and supports both single-mode fiber (SMF) and multimode fiber (MMF) systems. Applications and Module TypesDual-fiber LC modules are widely used in SFP, SFP+, and SFP28 transceivers, enabling speeds from 1G to 25G Ethernet, and even in higher-speed QSFP modules for 100G links.

Examples include: 10G SFP+ Single-Mode Dual-Fiber Modules: Operate at 1550 nm wavelength, supporting long-range transmission up to 80 km, ideal for connecting data centers or buildings across a city. 10G SFP+ Multimode Dual-Fiber Modules: Support up to 10 Gbps over distances up to 300 m on MMF, suitable for short-range data center or enterprise backbone links. 100G QSFP BiDi Modules: Use duplex LC connectors for short-reach multimode fiber links, enabling reuse of existing duplex MMF infrastructure for 40G or 100G Ethernet upgrades.

Design Features

A duplex LC connector includes: Ferrules: Two 1. 25 mm zirconia ceramic ferrules for precise alignment and protection of fiber cores. Housing and Latch: Plastic shell with push-pull latch for easy connection and disconnection in dense panels.

Boot and Duplex Clip: Protects the cable and holds two fibers together. Polish Types: UPC (flat) for general use, APC (angled) for applications sensitive to reflections, such as DWDM. Advanced modules may include real-time signal calibration chips to maintain data integrity and prevent bit errors during transmission.

Advantages

Compact size for high-density port layouts. Full-duplex communication for simultaneous TX/RX. Compatibility with both SMF and MMF.

High reliability for data center, enterprise, and telecom networks. Ease of deployment with polarity-reversible or uniboot LC options to reduce cabling bulk.

Best Practices

Ensure correct TX/RX polarity to maintain stable optical links. Handle connectors carefully to avoid contamination or damage to ferrules. Match modules with compatible fiber types and transceiver standards.

Use duplex LC modules in pairs for proper full-duplex operation.

Dual-fiber L

C interface modules remain a central component in modern optical networks, providing high-speed, reliable, and scalable connectivity for both short- and long-range applications.

Dual-fiber LC interface fiber optic module - CGWEB NETWORK INFRASTRUCTURE [PDF]

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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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