Patent ID: 6400870
Filing Date: 2002-06-04
Classification: G02B

Abstract:
A method of making an interferometric optical filter comprising the steps of:a) providing a splitter and combiner; b) providing two arms coupled to the splitter and combiner, the two arms each having a core and a cladding, the arms being substantially same optical path length and having substantially similar mode field diameters along the length thereof; and, c) irradiating a region of one of the two arms with light of a suitable intensity and duration so as to vary the refractive index n over a region of length L in a substantially uniform manner of said one of the two arms to provide a refractive index difference An and an optical path length difference between the two arms to effect a change &Dgr;f, where &Dgr;f is the spacing between a peak and null wavelength of the spectral response of the filter.