Optical wavelength demultiplexer

Details Optical wavelength demultiplexer Optical wavelength demultiplexer

1990-04-24

1992-03-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250226, 385 15, 359124, H01J 516, H01J 100

Patent

active

050991140

ABSTRACT:
An optical wavelength demultiplexer including an optical conversion device which converts a difference in wavelengths of a plurality of input signals into a difference in spatial power distribution of the input light signals, and a pattern recognition element for recognizing patterns of the spatial power distribution and taking out output signals. At the output portion of the optical conversion device, spatial power distributions are formed which are different for different wavelengths. After converting the spatial power distributions by the pattern recognition element into electrical signals, pattern recognition of the signals is performed to regenerate the original input signals with their respective wavelengths. The optical conversion device uses a diffractive grating or a combination of an optical multimode circuit, an optical multimode fiber, and a plurality of optical wavelengths. The pattern recognition element is constructed by a combination of a photo-detector array and a neural network, or a combination of a hologram element, a photo-detector array and a neural network.

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