Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-11-08
1997-07-08
Chin, Wellington
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359123, 385 11, H04J 1408
Patent
active
056467591
ABSTRACT:
An improved optical loop mirror is used in an optical demultiplexer to demultiplex time division multiplexed optical communications channels. High bit-rate optical pulses representing a plurality of time division multiplexed communications channels are input to a 3 dB coupler in an optical loop mirror. The coupler separates the high bit-rate optical pulses into two substantially equal high bit-rate pulse streams propagating in opposite directions around a loop of fiber in the mirror. Lower bit-rate optical switching pulses are injected into the loop so as to substantially coincide with selected pulses in the high bit-rate pulse stream corresponding to a communications channel to be demultiplexed from the plurality of multiplexed communications channels. A gain controlling element, such as an amplifier or a lossy element, in the loop changes the amplitude of one of the two high bit-rate pulse streams flowing in the loop so that the selectivity of the demultiplexer to the desired channel and the rejection of unwanted channels by the demultiplexer is enhanced.
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Lichtman Eyal
Mollenauer Linn Frederick
Bacares Rafael
Chin Wellington
Indyk Eugene S.
Lucent Technologies - Inc.
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