A fiber reflector (or fiber optic reflector/FBG reflector) is a passive optical device, often used at user endpoints (ONU) in FTTx networks, that selectively reflects specific, non-working wavelengths (typically 1650±5nm) back to an OTDR for network monitoring. It allows standard data signals to pass while ensuring high reflectivity for testing, enabling efficient fiber fault detection without disrupting service. They are primarily used in FTTx, PON, and P2P networks to detect link faults, fiber breaks, or high,, excessive losses via OTDRs. They often use Fiber Bragg Gratings (FBG) or thin-film filters to allow normal operating bands (e.g., 1310/1490/1550nm) through, while reflecting test signals (e.g., 1650nm) back. They are usually installed at the subscriber's location (at the ONU/ONT) to delineate the end of the line for testing. They features low insertion loss for data signals and high reflection for test signals, improving accuracy in determining signal integrity. Common types include SC/APC and SC/UPC connectors, often with a pigtail or adaptor design. They are primarily used in real-time, remote tracking of network health and quick troubleshooting, creating specific optical paths, as noted by Thorlabs, marking the end of a fiber optic cable in a system, according to Light Optics.
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