Patent ID: 8538209
Filing Date: 2013-09-17
Classification: G02B

Abstract:
1. An optical device comprising: a first port receiving a light beam including signals respectively at a plurality of wavelengths including a selected wavelength and outputting a reflected light beam including all of the signals except for a signal at the selected wavelength, a second port outputting the signal at the selected wavelength; an optical filter configured to pass the signal at the selected wavelength; a collimator receiving the light beam and coupling the light beam from the first port to the optical filter that passes the signal at the selected wavelength and produces the reflected light beam to the first port; and a reflector positioned with an angle with respect to the collimator so that the signal at the selected wavelength that passes the collimator is reflected by the reflector back to the collimator and goes back onto the second port, wherein the optical filter being a thin film filter (TFF) together with the angled reflector duplicates a performance of a fiber Bragg grating (FBG) filter would deliver.