Patent ID: 6493141
Filing Date: 2002-12-10
Classification: G02B,G02F,H04J

Abstract:
An optical device, comprising:a first polarization beam splitter (PBS); a set of optical rotators optically coupled to the first PBS at a face intersecting a main axis of the device, the set of optical rotators comprising a non-reciprocal optical rotator (NRR) and a reciprocal optical rotator (RR); a second PBS optically coupled to the set of optical rotators at a side opposite to the first PBS; a non-linear interferometer (NLI) optically coupled to the second PBS at a side opposite to the set of rotators; and an optical port optically coupled to the first PBS at a side opposite to the set of optical rotators, wherein the optical port comprises: an input reciprocal optical rotator optically coupled to the first PBS, a birefringent walk-off plate optically coupled to the input reciprocal optical rotator at a side opposite to the first PBS, and an optical collimator optically coupled to the birefringent walk-off plate at a side opposite to the input reciprocal optical rotator, wherein the optical collimator comprises: a lens/spacer element optically coupled to the birefringent walk-off plate at a side opposite to the input reciprocal optical rotator, and a glass plate with a first end face and a second end face opposite to the first end face, the second end face optically coupled to the lens/spacer element at a side opposite to the birefringent walk-off plate.