Optical bandpass filter for wavelength division multiplexing

摘要

The invention relates to an optical bandpass filter and a method for filtering an optical signal having a plurality of WDM component wavelengths. The optical bandpass filter includes a spectrally dispersive element and an optical module. The spectrally dispersive element is adapted to receive the optical signal and to provide a dispersed optical signal to the optical module. The optical module returns predetermined WDM component wavelengths to the spectrally dispersive element. The predetermined WDM component wavelengths are imaged to predetermined locations.