Patent ID: 8664584
Filing Date: 2014-03-04
Classification: G02B

Abstract:
1. A compact optical tap monitor device comprising: an input waveguide for launching an optical signal; a collimating lens for collimating the optical signal; a tap filter for receiving the collimated optical signal at an acute angle of incidence, for reflecting a first portion of the optical signal at an acute angle of reflection, and for passing a second portion of the optical signal; an output waveguide spatially separated from the input waveguide for outputting the first portion of the optical signal; a photodetector including an active area for receiving the second portion of the optical signal and for providing a measure of the optical power in the second portion; an imaging lens for focusing the second portion of the optical signal onto the active area of the photodetector, and for spatially separating the second portion of the optical signal from light from the output waveguide; and a mask covering a portion of the active area passing the second portion of the optical signal to the photodetector, and blocking light from the output waveguide from the active area of the photodetector; wherein the collimating lens is defined by an optical axis; wherein the second portion of the optical signal is directed by the collimating lens to one side of the optical axis, and the light from the output fiber is directed by the collimating lens to the opposite side of the optical axis; and wherein the mask is positioned on the opposite side of the optical axis preventing the light from the output waveguide from entering the photodetector.