Patent ID: 8014073
Filing Date: 2011-09-06
Classification: G02B

Abstract:
1. An optical hybrid, comprising: an optical beam splitter (BS) for combining a signal beam and a reference beam incident on said BS from opposite sides to produce a first interference beam and a second interference beam, wherein said first interference beam comprises a reflected portion of said signal beam and a transmitted portion of said reference beam, and wherein said second interference beam comprises a transmitted portion of said signal beam and a reflected portion of said reference beam; and a coating in contact with said BS to satisfy a phase matching condition, said coating comprising a material that absorbs a portion of said reference beam and a portion of said signal beam, wherein said phase matching condition is φ where φ r is the phase change of said reflected portion of said signal beam, where φ r′ is the phase change of said reflected portion of said reference beam and where φ t is phase change of said transmitted portion of said reference beam.