Optical isolator and optical fiber amplifier

Details Optical isolator and optical fiber amplifier Optical isolator and optical fiber amplifier

1994-10-18

1996-02-20

Hellner, Mark

Optical: systems and elements

Optical amplifier

Optical fiber

359629, 359639, G11B 700

Patent

active

054934400

ABSTRACT:
On one end side of a converging rod lens are provided a first and second input optical fibers and a first and second output optical fibers. On the other end side of the converging rod lens is provided a reflecting mirror. Between the converging lens and the first and second input and output optical fibers is provided a birefringent element for resolving a ray which passes therethrough into an ordinary ray and an extraordinary ray. In the optical paths of the first and second output optical fibers between the converging rod lens and birefringent element is placed a compensator for rotating 45 degrees the plane of polarization of a ray which passes therethrough. The reflecting mirror reflects incident rays from the first and second input optical fibers to the first and second output optical fibers. Between the converging rod lens and the reflecting mirror is provided a magneto-optical element for rotating 22.5 degrees the plane of polarization of a ray which passes therethrough. The rays emitted from the first and second input optical fibers have their planes of polarization rotated 90 degrees by the magneto-optical element and compensator.

REFERENCES:
patent: 5191467 (1993-03-01), Kapany et al.
patent: 5299056 (1994-03-01), Kurata et al.
patent: 5355249 (1994-10-01), Souda et al.
U.S. patent application Ser. No. 08/059,762, filed on May 12, 1993, Kurata et al.

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