Patent ID: 6215592
Filing Date: 2001-04-10
Classification: G02B,G02F

Abstract:
An optical filter for filtering an optical input including a plurality of multiplexed optical wavelengths, said filter comprising:first and second inner mirrors separated substantially by an inner spacer;a first outer mirror separated from said first inner mirror substantially by a first outer spacer; anda second outer mirror separated from said second inner mirror substantially by a second outer spacer;wherein said first and second inner mirrors have reflectivity which is greater than the reflectivity of said first and second outer mirrors, andwherein said inner spacer and said first and second outer spacers have substantially identical optical thicknesses, said optical thicknesses being adapted to align resonant transmission frequency passbands of said filter with a pre-determined first set of said multiplexed optical wavelengths for transmitting said pre-determined first set of said multiplexed optical wavelengths and reflecting a pre-determined second set of said multiplexed optical wavelenghts.