A fiber-optic transducer which employs coherence multiplexing for optical transmission of binary encoded data via a singlemode optical fiber to a coherent optical receiver is described. An encoder is used to read the position of an optical code plate and switches in a parallel binary format, delay each channel with respect to the others using fiberoptic delay lines and combine them into a single fiber. A phase-carrier, coherent detection scheme with a limited coherence laser is used to multiplex the information on the single fiber. This multiplexing technique allows up to 100 binary signals at 10 kbps to be transmitted simultaneously over a single fiber, and then separated by coherent detection using relatively short delay lines compared to time division multiplex systems. Because a cw laser is the source of light, no pulsed electronics are needed. Furthermore, heterodyne detection can be used to enhance the signal-to-noise ratio. Laboratory results from a two channel experiment are presented and general application to passive coherent binary amplitude-shift-keyed data networks is discussed.
Passive fiber-optic coherence multiplexing for aircraft sensors
Passives faseroptisches Kohaerenzmultiplex fuer Luftfahrtsensoren
1986
6 Seiten, 7 Bilder, 10 Quellen
Conference paper
English
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