Patent ID: 7173763
Filing Date: 2007-02-06
Classification: G02B,H04J,H04Q

Abstract:
1. A filter cell for filtering optical signals propagating on each of two legs of an optical loop which intersects the filter cell, the filter cell operating as a full waveplate to a first set of one or more optical signals and a half waveplate to a second set of one or more optical signals on a selected one of the two legs and as a half waveplate to the first set of one or more optical signals and a full waveplate to the second set of one or more optical signals on a remaining one of the two legs, the filter cell comprising: a base; a first polarization beam splitter (PBS) pair, comprising: a second PBS pair, comprising: one or more optical components mounted to the base, and optically coupled and shared by the first and second PBS pair.