SC Interface Optical Module Single Mode

SC single-mode optical modules are fiber transceivers designed for long-distance, low-density networks, featuring a square push-pull SC connector and supporting single-mode fiber transmission.

Overview

SC (Subscriber Connector) single-mode optical modules are SFP transceivers that use a 2.5mm ceramic ferrule square push-pull interface to connect to single-mode fiber (SMF) networks . They are widely used in legacy networks, industrial applications, and low-density deployments, where high port density is not a primary concern . Unlike LC connectors, which are smaller and suited for high-density environments, SC connectors occupy more space but provide robust and reliable connections for long-distance optical links.

Key Features

• Transmission Type: Single-mode fiber, typically supporting distances from 10 km up to 80 km depending on wavelength and module type .
• Data Rate: Commonly available in 1.25G SFP modules for Gigabit Ethernet and 10G BiDi SFP+ modules for higher-speed applications .
• Connector Structure: Square push-pull design with a 2.5mm ferrule, ensuring precise alignment and low insertion loss .
• Compatibility: Works with a wide range of switches and network devices from vendors like Cisco, Huawei, D-Link, Mikrotik, ZTE, and TP-Link .
• BiDi Support: SC modules can support bidirectional (BiDi) transmission using Wavelength Division Multiplexing (WDM), allowing two-way communication over a single fiber strand, which saves fiber resources .

Advantages

• Legacy Network Support: Ideal for existing single-mode fiber infrastructure where SC connectors are already deployed .
• Durability: Larger ferrule and push-pull design provide stable connections in industrial or outdoor environments .
• Long-Distance Transmission: Single-mode SC modules can achieve longer reach compared to multimode modules, making them suitable for metro, campus, or backbone networks .

Considerations

• Space Efficiency: SC connectors are larger than LC connectors, making them less suitable for high-density data center racks .
• Patch Cable Compatibility: Requires SC single-mode patch cables; mismatched connectors may need adapters, which can increase insertion loss and operational complexity .
• Deployment Scenario: Best used in low-density, long-haul, or legacy network environments rather than modern high-density data centers .

Example Module

A typical 1.25G SC single-mode SFP module operates at TX 1550nm / RX 1330nm, supports 10 km transmission, and includes DDM (Digital Diagnostic Monitoring) for real-time performance monitoring . These modules are compliant with SFP MSA standards and meet Class I laser safety requirements .

Summary

SC single-mode optical modules are reliable, long-distance transceivers suitable for legacy or low-density networks. They provide robust connections with single-mode fiber, support bidirectional transmission in BiDi modules, and are compatible with a wide range of network devices. While less space-efficient than LC connectors, their durability and long-reach capabilities make them a practical choice for specific network deployments .