Beam-to-fiber coupling with low standing wave ratio.
When light is coupled into or out of an optical fiber through a normally cut end face, reflection may set up disturbing standing waves. They can be avoided by a slight tilt ( approximately 12 degrees ) of the end face of the fiber and a corresponding inclination of the fiber axis. Residual reflections of -58 to -68 dB are obtained.
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Ulrich
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Rashleigh