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Connecting two Si-type multimode optical fibers

Fiber and communications infrastructure knowledge brief Published 26 Nov 2023

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

Two multimode optical fibers can be connected using fusion splicing, mechanical splicing, or fiber optic connectors, ensuring proper alignment to minimize signal loss.

Understanding Multimode Fiber

Multimode fibers have a larger core diameter (typically 50 µm or 62. 5 µm) that allows multiple light modes to propagate simultaneously, making them ideal for short-distance, high-bandwidth applications such as within buildings or data centers. When connecting two multimode fibers, it is crucial to match the core size and type (e.g., OM1, OM2, OM3, OM4) to avoid modal dispersion and signal degradation.

Methods for Connecting Fibers1.

Fusion Splicing

Fusion splicing involves aligning the fiber ends precisely and then fusing them together using heat. This creates a permanent, low-loss connection suitable for high-performance networks. Fusion splicing requires specialized equipment, such as a fusion splicer, and careful preparation of the fiber ends, including stripping, cleaning, and cleaving.

2.

Mechanical Splicing

Mechanical splicing uses a splice holder or connector to align and hold the fiber ends in place. While this method is less expensive than fusion splicing, it may result in slightly higher insertion loss. Mechanical splices are useful for temporary connections or situations where fusion splicing equipment is unavailable.

3.

Fiber Optic Connectors

Using pre-terminated connectors (e.g., LC, SC, ST, or FC) allows fibers to be connected and disconnected easily. Connectors rely on ferrules and alignment mechanisms to ensure proper light transmission. For multimode fibers, it is important to use connectors designed for the specific core size and type to maintain performance.

Additional Considerations

Core Alignment: Ensure both fibers have the same core diameter and type to minimize signal loss and modal dispersion. Cleaning and Inspection: Fiber ends must be clean and free of debris; use proper cleaning tools and inspection microscopes. Media Converters: If connecting multimode fibers to single-mode fibers or different core sizes, a media converter with appropriate SFP modules may be required to adapt the optical signals.

Duplex Connections: For bidirectional communication, use duplex fiber strands and ensure proper send/receive alignment between devices. By following these methods and best practices, two silicon-type multimode fibers can be connected reliably, maintaining high data integrity and minimal signal loss.

Connecting two Si-type multimode optical fibers - CJC FIBRE CONSULTANTS [PDF]

Connecting two Si-type multimode optical fibers

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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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