Optical fiber non-reciprocal phase shifters and optical isolator

Details Optical fiber non-reciprocal phase shifters and optical isolator Optical fiber non-reciprocal phase shifters and optical isolator

1994-08-29

1995-12-26

Lee, John D.

Optical waveguides

Optical fiber waveguide with cladding

385 11, 385 6, 3242441, G02B 616

Patent

active

054795516

ABSTRACT:
In accordance with the invention, an optical fiber phase shifter comprises a length of asymmetrical optical fiber disposed perpendicular to a magnetic field for providing a non-reciprocal phase shift. Preferably the fiber is wound in a circular coil and exposed to an axial field as from a pancake magnet. In an isolator, the fiber length and magnet strength are chosen to provide non-reciprocal phase shifts of .+-.45.degree. or .+-.90.degree.. The isolator including the phase shifter can be any of several configurations.

REFERENCES:
patent: 4850098 (1989-07-01), Yurek
patent: 4978189 (1990-12-01), Blonder et al.
patent: 5058971 (1991-10-01), Schmitt et al.
patent: 5182783 (1993-01-01), Bosc et al.
T. G. Giallorenzi, et al. "Optical Fiber Sensor Technology", IEEE Journal of Quantum Electronics, vol. QE-18, No. 4, pp. 626-665 (1982).

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