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How to use a fusion splicer to fuse multimode optical fibers

Fusion splicing multimode fibers involves precise fiber preparation, alignment, and melting with a fusion splicer to create a low-loss, permanent joint.Safety Precautions

Before starting, ensure proper safety measures: wear high-rated safety goggles and cut-resistant shoes, handle glass shards carefully, and use anti-static wrist straps or mats to protect both yourself and the splicer electronics from static discharge. Always check the splicer's power supply and electrode condition before beginning work .

Fiber Preparation
  1. Strip the Fiber Coating: Use a multi-hole stripper suitable for multimode fibers (typically 250µm for bare fiber, 900µm for coated fiber). Apply uniform pressure to avoid microfractures .
  2. Clean the Fiber: Wipe the exposed fiber with an isopropyl alcohol (IPA) swab to remove oils and debris .
  3. Cleave the Fiber: Use a precision cleaver to create a flat, mirror-like end face. A poor cleave can cause high splice loss or failure .
Splicing Procedure
  1. Load the Fibers into the Splicer: Open the splicer's windshields and place each fiber into the V-groove, ensuring clamps face up. Close the covers gently to avoid bending or stressing the fiber .
  2. Align the Fiber Cores: Modern fusion splicers use dual cameras and precision motors to align multimode fiber cores within microns. Multimode fibers can be more challenging due to their larger core and graded-index profile, so follow the splicer's recommended settings .
  3. Fuse the Fibers: The splicer generates an electric arc to melt the fiber ends and push them together, forming a continuous glass pathway. This creates a permanent, low-loss joint with typical losses as low as 0.02 dB .
Post-Splice Steps
  1. Inspect the Splice: Check the splice under the splicer's microscope or using an optical time-domain reflectometer (OTDR) to ensure minimal loss and proper alignment .
  2. Protect the Splice: Slide a splice protection sleeve over the joint and heat it to secure the splice mechanically and protect it from environmental stress .
Tips for Multimode Fibers
  • Use manufacturer-recommended splicer settings for multimode fibers to account for core size and numerical aperture differences .
  • Avoid mixing fibers from different manufacturers or types, as mismatched cores can increase splice loss .
  • Handle fibers gently to maintain bend radius above 30 mm and prevent microbending losses . By carefully following these steps, you can achieve high-performance, durable multimode fiber splices suitable for telecommunications, data centers, and industrial networks .
How to use a fusion splicer to fuse multimode optical fibers

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