Patent ID: 7200302
Filing Date: 2007-04-03
Classification: G02B

Abstract:
1. An optical filter comprising: a first mirror; a cavity coupled to said first mirror; and a second mirror coupled to said cavity; wherein said first and second mirrors each comprise a plurality of trenches etched into the surface of a waveguide, a desired propagation mode of the waveguide is selected by selecting a height of the waveguide, a width of the waveguide, a refractive index of the waveguide, and/or a refractive index of the surrounding medium, according to: where M is the desired propogation mode, d is the width and the height of the waveguide, n 1 is the refractive index of the waveguide, n 2 is the refractive index of a surrounding medium and λ 0 is a center wavelength of the mirrors.