PD/LD module and PD module

Details PD/LD module and PD module PD/LD module and PD module

1996-07-29

1998-06-09

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Plural

385 88, 385 93, 385 89, 25022711, 359299, 361728, 257433, G02B 628

Patent

active

057648263

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

REFERENCES:
patent: 5065226 (1991-11-01), Kluitmans et al.
patent: 5586208 (1996-12-01), Nishiyama
Kawabata et al, "Capacity Enlargement in a Low-Speed PON System by Using Multi-Rate Burst Transmission", 6th International Workshop on Optical Access Networks Oct. 16-19, 1994 Kyoto, Japan, Conference Proceedings, pp. 2.4-1-2.4-5.
Yumoto et al, "Low Cost SingleMode WDM Module", 1990 Spring National Convention Record, The Institute of Electronics, Information and Communication Engineers, p. 4-258 no month.
Adachi et al, "Small and Thin Type Optical Wavelength Division Multiplexing Module", 1990 Autumn National Convention Record, The Institute of Electronics, Information and Communication Engineers, p. 4-264 (1990) no month.
Terui et al, "Optical Module for Fiber Optic Subscriber Systems", NTT R&D, vol. 42, No. 7, 1993, pp. 903-912 no month.
Kawachi, "Current Status and Future Trends in Planar Lightwave Circuit Technologies", NTT R&D, vol. 43, No. 11, 1994, pp. 1273-1280 no month.

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