Optical isolator
AssigneeFuji Electrochemical Co., Ltd.
InventorsAkihiro Masuda, Ikuo Maeda, Hideaki Yuri, Yoichi Suzuki
Life of this patent
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Abstract
A non-reciprocal unit and a parallel-surfaced flat birefringent plate are provided between incident side and outgoing side fiber collimators. The non-reciprocal unit is formed by disposing two tapered birefrigent plates, one on each side of a 45.degree. Faraday rotator consisting of a cylindrical permanent magnet and a magneto-optical element housed in the magnet. The optical axes of the parallel-surfaced flat birefringent plate and adjacent tapered birefringent plate are staggered from each other by 90.degree.. The thickness of the parallel-surfaces birefringent plate is set equal to the sum of the thicknesses of the two tapered birefringent plates.
Claims5
A non-polarization-mode-dispersing optical isolator comprising:
- a cylindrical casing,
- a non-reciprocal unit, in said casing, having a 45.degree. Faraday rotator and two tapered birefringent plates on opposite sides of said Faraday rotator,
- fiber collimators on opposite sides of said non-reciprocal unit,
- said fiber collimators including a first fiber collimator connected to a first optical fiber and a second fiber collimator connected to a second optical fiber, and
- a parallel-surfaced flat birefringent plate between said non-reciprocal unit and one of said fiber collimators,
- wherein said parallel-surfaced flat birefringent plate is fixed within said casing with an optical axis of said parallel-surfaced flat birefringent plate is staggered at 90.degree. from an axis of an adjacent one of said tapered birefringent plate.
Dependencies are inferred from the claim text.