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Reflection suppression by orthogonal modes

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1 Author(s)
von Helmolt, C.H. ; Heinrich-Hertz-Inst. fur Nachrichtentech., Berlin, West Germany

A method is proposed where isolation of a single-frequency laser from reflections of an optical network is obtained using reciprocal elements throughout. The principle is based on the isolation obtained by a double transit quarter-wave plate, which can be generalized. Only linearity and time invariance are required. Thus the network elements can even be nonreciprocal. An application is the isolation of the local-oscillator laser in an integrated optical heterodyne/homodyne receiver

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Lightwave Technology, Journal of  (Volume:7 ,  Issue: 4 )