Patent ID: 7394986

Claim:
A wavelength-selective optical filtering component, capable of transmitting light of a narrow optical spectral band centered around a given wavelength (λ c ) and capable of reflecting light having a wavelength outside said band, comprising: an optical filtering component including a Fabry-Perot cavity; an input waveguide conveying light radiation into the cavity at a first angle of incidence (θ 1 ), in order to make a first pass therethrough; and means for returning the light radiation that has passed through the cavity during the first pass in order to make a second pass through the cavity at a second angle of incidence (θ 2 ), and in that the second angle of incidence (θ 2 ) differs from the first angle of incidence (θ 1 ); wherein the transfer function (T 1,2 (λ)) of the component is defined by the multiplication of two transfer functions of spectrally offset Fabry-Perot filters.