Pd/ld module and pd module

Details Pd/ld module and pd module Pd/ld module and pd module

H - Electricity

04

B

H04B 10/14 (2006.01) G02B 6/42 (2006.01) H01S 5/026 (2006.01) H04B 10/24 (2006.01)

Patent

CA 2181771

Bidirectional optical communication system transmits optical signals with two different wavelengths .lambda.1 and .lambda.2 (.lambda.1<.lambda.2) between a broadcasting station and a plurality of ONU terminals. Bisecting separation of .lambda.1 and .lambda.2 requires expensive WDMs. .lambda.1-selective photodiode which absorbs all the .lambda.1 light and allows all the .lambda.2 to pass through is proposed. The energy gap Eg1 of the light receiving layer is determined to be smaller than hc/.lambda.2 and larger than hc/.lambda.1. The .lambda.1-selective photodiode and the other photodiode are positioned in series on a beam line, which dispenses with WDMs.

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