Arrayed-wave guide grating multi/demultiplexer with loop-back op

Details Arrayed-wave guide grating multi/demultiplexer with loop-back op Arrayed-wave guide grating multi/demultiplexer with loop-back op

1993-09-28

1995-05-09

Williams, Hezron E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359115, 359116, 359124, 385 24, 385 14, 385 15, 385 37, G02B 626, H04J 1400

Patent

active

054145481

ABSTRACT:
An optical device is presented which is useful for optical signal transmission and switching systems by multiplexing and demultiplexing optical signals in looped optical paths, consisting of a plurality of individual loop-back optical paths. The device is essentially a multi/demultiplexer having an arrayed waveguide grating disposed between a plurality of input sections and output sections which are joined by the plurality of individual loop-back optical paths. Because the modulated signals are looped back into the same optical paths using the same devices, problems of mismatching performance introduced by using different optical devices are avoided. The device processes individual optical signals of different wavelengths, minimizes splitting losses, and reduces noise components by producing narrow bandpass signals of high signal to noise ratio. Optical signal splitting and insertion, delay line memory and delay equalization circuits can all be handled by the same circuit configuration. The device is simple in construction, reliable in performance and economical in production.

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Patent Abstracts of Japan, vol. 13, No. 200 (P-869), May 12, 1989 & JP-A-01 020 506.

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