Optical Reflections and noise and distortion As in RF systems, reflections in RF / Optical systems are an issue. Optical reflections back into the laser diode cause a disturbance in the lasers gain cavity creating noise and distortion. The main sources of optical reflections are connector interfaces. A simple way to avoid most of the reflections at the interfaces is through the use of angle-polished connectors. The tip of an angle-polished, or APC connector is polished at an 8 degree angle. This is the optimal angle to minimize reflections from traveling back down the fiber into the laser. At this angle most reflections occurring due to the connector will be angled out of the fiber and dissipated harmlessly. Other general rules to minimize reflections: keep the connector tip clean and scratch free and always replace the cap onto the tip when the connector is not mated.
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