Method and circuit for demultiplexing an optical signal

Details Method and circuit for demultiplexing an optical signal Method and circuit for demultiplexing an optical signal

1997-05-29

2000-03-21

Chan, Jason

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359127, 359129, 359130, H04J 1402

Patent

active

060409320

ABSTRACT:
A system and method are disclosed for demulitplexing closely spaced channels carrying optically encoded data. A composite optical signal having data channels corresponding to center wavelengths .lambda.1, .lambda.2, .lambda.3, .lambda.4, . . . .lambda.n are separated into two composite optical signals of first of which comprises data channels corresponding to center wavelengths .lambda.1, .lambda.3, . . . .lambda.n and a second which comprises data channels corresponding to center wavelengths .lambda.2, .lambda.4, . . . .lambda.n-1, wherein adjacent channels center wavelengths are separated from one another by a distance "d". A periodic multi-cavity Fabry-Perot etalon having a free spectral range of "2d" is coupled to a circulator for launching an input beam. The first of the two composite optical signals carrying channels 1, 3, . . . n is reflected from the input port of the etalon and the second of the of the two optical signals carrying channels 2, 4, . . . n-1 is transmitted through the etalon. After the two signals are separated, further separation can be achieved by using conventional dichroic filters.

REFERENCES:
patent: 5748350 (1998-05-01), Pan et al.
patent: 5751456 (1998-05-01), Koonen
patent: 5786915 (1998-07-01), Scobey
patent: 5841918 (1998-11-01), Li
patent: 5852505 (1998-12-01), Li

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