Method of interference reduction for frequency multiplexed optic

Details Method of interference reduction for frequency multiplexed optic Method of interference reduction for frequency multiplexed optic

1991-02-01

1992-05-05

Healy, Brian

Optical waveguides

With optical coupler

Plural

385 47, 385 49, 385131, 385140, 359124, 359157, 359170, 359173, 359193, 359195, G02B 628, H04J 100, G02F 100

Patent

active

051115190

ABSTRACT:
A fiber-optic bandpass filter comprising a resonant cavity formed in an optical waveguide is coupled to a fiber-optic bus which carries a large number of frequency multiplexed channels. The fiber-optic bandpass filter is selected to be one-half the modulation wavelength of the desired center frequency within a range of frequencies carried on the same transmission. The creation of a resonant cavity at the desired center frequency provides a filter which reduces the intensity of signals at surrounding frequencies so that an overall reduced output power is provided, resulting in less cross-talk between a large number of frequency multiplexed signals which, unfiltered, would all have equal power. The filter is broad enough that many adjacent channels are not significantly attenuated. The optical waveguide of which the filter is formed may be in the form of an optical fiber segment or a planar waveguide.

REFERENCES:
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patent: 4900116 (1990-02-01), Mathis
patent: 4910539 (1990-03-01), Mathis et al.
patent: 5002352 (1991-03-01), Bradley et al.

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