发明名称 |
Improved fiber loop mirror for time division demultiplexing. |
摘要 |
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. <IMAGE> |
申请公布号 |
EP0635739(A1) |
申请公布日期 |
1995.01.25 |
申请号 |
EP19940305136 |
申请日期 |
1994.07.13 |
申请人 |
AT&T CORP. |
发明人 |
LICHTMAN, EYAL;MOLLENAUER, LINN FREDERICK |
分类号 |
G02B6/34;G02F1/35;H04J3/00;H04J14/08 |
主分类号 |
G02B6/34 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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