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Reflection suppression by orthogonal modes

: Helmolt, C. von


Journal of Lightwave Technology 7 (1989), Nr.4, S.692-3
ISSN: 0733-8724
Fraunhofer HHI ()
integrated optics; laser accessories; laser beams; laser frequency stability; light reflection; optical elements; receivers; reflection suppression; single-frequency laser; optical network; reciprocal elements; double transit quarter-wave plate; local-oscillator laser; integrated optical heterodyne/homodyne receiver

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.