Optical module lc interface type

Optical module lc interface type - BENNIE OPTICAL [PDF]

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LC (Lucent Connector) is a small form factor fiber optic interface widely used in SFP, SFP+, SFP28, QSFP+, QSFP28, and QSFP-DD transceiver modules for high-density optical networking.

Overview of LC Connectors

LC stands for Lucent Connector, originally developed by Lucent Technologies for telecom applications. It features a 1.25 mm ferrule, which is half the size of the SC connector's 2.5 mm ferrule, allowing high port density in switches, routers, and patch panels . LC connectors use a push-pull latch mechanism, similar to RJ45 connectors, making them easy to insert and remove while maintaining precise fiber alignment . They conform to TIA/EIA-604 standards, ensuring cross-vendor compatibility .

Key Features

Small Form Factor: Ideal for high-density applications in data centers and enterprise networks .
Low Insertion Loss: Many LC connectors include a six-position tuning mechanism to optimize fiber core alignment, reducing signal loss .
Duplex and Simplex Options: LC connectors can be duplex (two fibers for bidirectional communication) or simplex (single fiber), depending on the transceiver and network design .
Polish Types: LC connectors may have UPC (Ultra Physical Contact) or APC (Angled Physical Contact) end-face polish, affecting return loss and signal quality .

LC-Interfaced Optical Modules

LC interfaces are standard on many optical transceiver modules, including:

SFP (Small Form-factor Pluggable): 1G and 10G modules
SFP+: 10G modules
SFP28: 25G modules
QSFP+: 40G modules
QSFP28: 100G modules
QSFP-DD: 400G modules, including 400GBASE-FR4 and 400GBASE-LR8 These modules use LC connectors to link with LC fiber patch cables, supporting both single-mode (SMF) and multimode (MMF) fibers . The choice of LC interface ensures compact, high-density deployment while maintaining optical performance.

Applications

LC interfaces are widely used in:

Data centers: Leaf-spine architectures, high-density switch ports
Telecom networks: Long-reach backbone links
Enterprise networks: High-speed SFP/SFP+ connections
Industrial and AI fabrics: High-bandwidth, low-latency optical links

Summary

The LC interface optical module type is the industry standard for modern high-speed optical networking. Its small form factor, low insertion loss, and duplex capability make it suitable for SFP, SFP+, SFP28, QSFP+, QSFP28, and QSFP-DD transceivers, supporting a wide range of speeds from 1G to 400G while enabling high-density, scalable network deployments .

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