Fiber connections naturally introduce some insertion loss when mated via adapters, so using high-performance adapters is essential for maintaining signal quality and long-term reliability. In general, the insertion loss should be limited to 0. The prospect of installing couplers into fiber-in-the-loop (FITL) subscriber systems has brought the issue of component reliability to the forefront. To gain that confidence and to ensure product reliability. Fiber couplers belong to the basic components of many fiber-optic setups. Device types considered include light emitting diodes (LEDs), light emitting diode (LED) dis-plays, laser diodes, phototransistors, photodiodes, optically coupled isolators, fiber optic cables and fiber optic connectors.
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