Method and apparatus for coherent detection in optical processor

Details Method and apparatus for coherent detection in optical processor Method and apparatus for coherent detection in optical processor

1981-03-23

1983-06-21

Arnold, Bruce Y.

Boots, shoes, and leggings

350 37, 350 372, 364822, G06G 900, G02B 532

Patent

active

043890938

ABSTRACT:
A method of and an apparatus for coherently detecting modulated optical signals employing optical mask-generated signals is disclosed. A spatial light modulator modulates a source beam with an information signal composed of one or more frequency components within its frequency bandwidth. The frequency components which are output from the modulator, including the zero frequency component, diverge and become spatially separated. A reference beam is formed from the zero frequency component by a reference beam generator. The reference beam is generated so as to appear to diverge from a reference point located at or near the spatial light modulator. The optical detector performs coherent detection by squaring the sum of the frequency components and the reference beam to provide an output information signal as a function of the input information signal.

REFERENCES:
patent: 3694657 (1972-09-01), Brooks
patent: 4107701 (1978-08-01), Sprague et al.
patent: 4110016 (1978-08-01), Berg et al.
patent: 4357676 (1972-11-01), Brown

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