All-fiber in line optical isolator

Details All-fiber in line optical isolator All-fiber in line optical isolator

1994-06-09

1995-12-26

Bovernick, Rodney B.

Optical waveguides

With optical coupler

Particular coupling function

385 9, 385 41, G02B 626

Patent

active

054795427

ABSTRACT:
The present invention is directed at an all-fiber in line isolator. The basic isolator includes a monomode optical fiber, a multimode waveguide, a coil or other traditional means to generate a magnetic field, and a fiber block or other traditional means to couple the fiber to the waveguide. In one embodiment, the fiber has a core and a cladding, and maintains a circular state of light polarization. The fiber has a coupling region where the cladding is partially removed. The waveguide evanescently couples to the fiber along the coupling region. The waveguide has magneto-optical properties such that applying a magnetic field along it causes backward propagating light to transfer to the waveguide with minimal disturbance to forward propagating light. Other embodiments using birefringent optical fibers are disclosed as well.

REFERENCES:
patent: 4268116 (1981-05-01), Schmadel et al.
patent: 4342499 (1982-08-01), Hicks, Jr.
patent: 4471219 (1984-09-01), Giallorenzi
patent: 4775216 (1988-10-01), Layton
patent: 4795233 (1989-01-01), Chang
patent: 4842358 (1989-06-01), Hall

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