Demodulation of phase-modulated light using birefringent crystals

1 July 1964

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IEEE

Vol. 52 (7) , 823-831
https://doi.org/10.1109/proc.1964.3125

Abstract

The application of birefringent crystals to accomplish the demodulation of phase-modulated light is considered. A particular combination of crystals and a polarization insensitive photodetector is termed a birefringent demodulator, and shown to have the properties that it will 1) convert a phase-modulated light signal into an amplitude-modulated light signal and subsequently detect it in a nearly lossless manner, and 2) simultaneously suppress or balance out an incident amplitude-modulated light signal. A time domain version of the "Jones Calculus" is formulated and used to analyze the demodulator. Conversion efficiency, suppression efficiency, and bandwidth are considered. Experimental results demonstrating PM to AM conversion and AM suppression at microwave modulation frequencies between 2 and 12 Gc are given.

Keywords

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