Patent ID: 6455841
Filing Date: 2002-09-24
Classification: G02B,H04J,Y10S

Abstract:
An optical wavelength router comprising:a first beam displacer operable to separate an input beam into a pair of orthogonally-polarized beams; a first polarization rotator operable to rotate the polarization of at least one of said beams so that both beams have a first polarization; a polarization-dependent routing element operable to route the beam pair along a first optical path; a second beam displacer operable to separate the beam pair into two pairs of orthogonally-polarized beams; a first reflective surface and a second reflective surface forming a resonator; and a third reflective surface having a higher reflectivity than the first reflective surface; wherein the resonator reflects a portion of the beam pairs and the third reflective surface reflects a portion of the beam pairs such that the group delay of the beam pairs is dependent on wavelength.