Patent ID: 7092587
Filing Date: 2006-08-15
Classification: G02B

Abstract:
1. An optical demultiplexer comprising: a first light bandpass filter that receives an input light beam at a first angle of incidence, passes a first light wavelength, and reflects a reflected beam; a second light bandpass filter that receives the reflected beam at a second angle of incidence and passes a second light wavelength, wherein the second angle of incidence is different from the first angle of incidence; a beam redirection element that receives the reflected beam from the first light bandpass filter and redirects the reflected beam toward the second light bandpass filter at the second angle of incidence; a first alignment reference surface, wherein exactly two of the first light bandpass filter, the second light bandpass filter, and the beam redirection element are positioned relative to the first alignment reference surface; and a second alignment reference surface, wherein exactly one of the first light bandpass filter, the second light bandpass filter, and the beam redirection element is positioned relative to the second alignhment reference surface, wherein the first alighment reference surface and the second alignment reference surface are planar but not parallel to each other.