Recommended Cold-Switch Fiber Optic Connectors

SC/APC and LC cold connectors are the most recommended for high-performance, field-installable fiber optic connections, offering low return loss and fast deployment.

Overview of Cold-

Switch (Fast) ConnectorsCold-switch fiber optic connectors, also called mechanical splice or fast connectors, allow field termination of fiber cables without a fusion splicer. They use pre-installed index-matching gel or mechanical clamping to align the fiber with a short fiber stub inside the connector body, enabling optical signal transmission. These connectors are ideal for FTTH deployments, emergency repairs, and small-scale installations, providing faster installation and lower tool costs compared to fusion splicing.

Recommended Connector TypesSC/APC Cold ConnectorsPolish Type: Angled Physical Contact (APC) with an 8-degree endface angle. Return Loss: ≥60 dB, minimizing back reflection. Applications: GPON, EPON, and CATV networks where low back reflection is critical.

Advantages: Standard green housing for APC, widely adopted in FTTH projects, excellent for video and data signals sharing the same fiber. SC/UPC Cold ConnectorsPolish Type: Ultra Physical Contact (UPC) with flat or slightly curved endface. Return Loss: ≥50 dB.

Applications: General-purpose FTTH drop cables and patching where moderate return loss is acceptable. Advantages: Easier to handle in standard installations, compatible with most single-mode networks.

LC Cold Connectors

Polish Type: Available in both APC and UPC. Applications: High-density environments such as data centers, switch-to-switch or switch-to-server links. Advantages: Compact 1.

25 mm ferrule, latch mechanism for secure connections, ideal for tight spaces and high-density panels.

Selection Considerations

Network Type: Use SC/APC for PON systems and CATV to reduce back reflection; LC connectors are preferred for high-density switch connections. Fiber Type: Ensure compatibility with single-mode or multi-mode fibers. Installation Environment: Cold connectors are suitable for indoor and controlled outdoor environments; for harsh outdoor conditions, consider connectors with dustproof and waterproof features.

Performance Metrics: Prioritize connectors with low insertion loss and high return loss to maintain signal integrity.

Practical Recommendations

For FTT

H drop cables: SC/APC cold connectors are the industry standard. For data center patching: LC cold connectors provide space-saving and reliable connections. Always verify connector polish type, ferrule size, and housing color to ensure compatibility with existing network equipment and transceivers.

By selecting SC/APC or LC cold connectors based on your deployment scenario, you can achieve fast, reliable, and low-reflection fiber connections suitable for modern network infrastructures.