Patent ID: 6611378
Filing Date: 2003-08-26
Classification: G02B,Y10S

Abstract:
A gain-flattening interference filter that adjusts relative power among a plurality of different wavelength channels conveyed through the filter comprising:a plurality of layers formed from at least two different refractive index materials; each of the layers being composed of an integer multiple number of unit sub-layers having physical thicknesses corresponding to a quarter-wavelength travel of a monitoring light beam as transmitted through the unit sub-layers; the at least two different refractive index materials including high and low refractive index materials arranged in the unit sub-layers having physical thicknesses that differ in inverse relation to their refractive indices; and the high and low index unit sub-layers being arranged in a substantially non-repeating pattern for producing different attenuating effects among the different wavelength channels conveyed through the filter.