Parallel Plate and Twin Polarization Wavelength Isolation Filters for Optical Communications

摘要

Optical filter assemblies based on either a parallel plate optical assembly or a polarization separation optical assembly are described. The optical assemblies usefully separate randomly polarized light with at least two transmission wavelengths from an optical communication signal.

主权项

1. An optical filter assembly, comprising:
a first optical assembly comprising a first face and a second face, the first face having a first non-polarizing edge filter (NPEF) disposed thereover, and the second face having a first anti-reflection (AR) coating disposed thereover; and a second optical assembly offset from the first optical assembly, the second optical assembly comprising a third face and a fourth face, the third face having a second NPEF disposed thereover and a second AR coating disposed thereover, wherein an incident optical beam is incident on the first face of the first optical assembly at an angle relative to a normal to the surface of the first face sufficient to separate polarization states of the incident optical beam but not too small that physical separation of wavelengths of the light is insufficient, and a reflected optical beam is reflected from the first face is incident on the third face at the angle relative to a normal to the surface of the third face sufficient to separate polarization states of the incident optical beam but not too small that physical separation of wavelengths of the light is insufficient.