G - Physics – 02 – F
Patent
G - Physics
02
F
345/11, 363/2
G02F 1/01 (2006.01) G02F 1/29 (2006.01) G02F 1/35 (2006.01) H04J 14/00 (2006.01) H04J 14/02 (2006.01)
Patent
CA 1279133
ABSTRACT WAVELENGTH SENSITIVE OPTICAL DEVICES An optical device for use as an optical filter or modulator comprises an optical waveguide (2) including a portion (1) having a refractive index that varies with optical intensity and means (5,7,30,40,8) for providing and directing at least two coherent waves (3,4) at that portion such that a standing wave of a modulated refractive index is established by interference between the coherent waves. m e standing wave provides a temporary modulated index grating in the waveguide. Variation of the angular separation of the waves tunes the wavelength sensitivity of the grating. me device may be used for modulation of WDM optical signals in the waveguide. Figure 2
542671
British Telecommunications Public Limited Company
G. Ronald Bell & Associates
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