Optical filter, method of controlling transmission wavelength th

Details Optical filter, method of controlling transmission wavelength th Optical filter, method of controlling transmission wavelength th

1993-09-24

1995-11-21

Boudreau, Leo H.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

319124, 319194, 372 92, H04B 1006

Patent

active

054692881

ABSTRACT:
An optical filter selectively receives a signal of a desired optical frequency from a plurality of optical-frequency-division multiplexing signals. Additionally, a transmission wavelength of the optical filter can be controlled using an optical receiver which includes the optical filter. The optical filter can perform a narrow-band optical filtering and permit, in optical communication systems using the optical filter, the transmission wavelength range of the optical filter to follow up a change in the wavelength of a light source. The optical filter selectively receives a signal of a desired optical frequency from a plurality of optical frequency-multiplexed signals. Additionally, the optical filter includes a first optical filter having a transmission band characteristic with a single peak in a desired band and a half band width of a desired amount of attenuation in the transmission band equal to or smaller than about two times a channel interval of the multiplexed light signals. A second optical filter, also in the optical filter, has a periodic transmission characteristic, an odd multiplication of a half of a free spectral range of the periodic transmission characteristic being equivalent to the channel interval of the multiplexed signals. The transmission band of the first optical filter matches with a transmission peak of the second optical filter.

REFERENCES:
patent: 4861136 (1989-08-01), Stone et al.
patent: 5023947 (1991-06-01), Cimini, Jr. et al.
patent: 5283845 (1994-02-01), Ip
Eng et al., "Optical FDM Switch Experiments With Tunable Fiber Fabry-Perot Filters" Globecom '90: IEEE Global Telecommunications Conference and Exhibition. Communications: Connecting the Furture pp. 1529-1533, vol. 3, 2-3 Dec. 190.

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