Optical isolator

Details Optical isolator Optical isolator

1991-11-20

1993-08-17

Arnold, Bruce Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359282, 359484, G02F 109, G02B 2728

Patent

active

052374459

ABSTRACT:
An optical isolator having a combination of rutile plates or other birefringent crystals and Faraday elements. This optical isolator includes, arranged in the stated order along an optical axis, a first birefringent crystal; a first Faraday element for rotating a plane of polarization 45.degree.; a second birefringent crystal having an optic axis rotated 45.degree. with respect to the first birefringent crystal, and a thickness .sqroot.2 times a thickness of the first birefringent crystal; a third birefringent crystal having an optic axis rotated 135.degree. with respect to the first birefringent crystal, and a thickness .sqroot.2 times the thickness of the first birefringent crystal; a second Faraday element for rotating the plane of polarization 45.degree.; and a fourth birefringent crystal having an optic axis rotated 180.degree. with respect to the first birefringent crystal, and a thickness equal to the thickness of the first birefringent crystal. Two polarized light components passing through this optical isolator have the same optical path length.

REFERENCES:
patent: 4178073 (1979-12-01), Uchida et al.
patent: 4548478 (1985-10-01), Shirasaki
patent: 4712880 (1987-12-01), Shirasaki
patent: 5033830 (1991-07-01), Jameson
patent: 5052786 (1991-10-01), Schulz
Shirasaki et al, "Compact Optical Isolator for Fibers Using Birefringent Wedges," Applied Optics, vol. 21, No. 23, Dec. 1, 1982, pp. 4296 to 4299.
Shirasaki et al, "A Compact Polarization-Independent Optical Isolator," Transactions of the IECE of Japan, vol. E64, No. 1, Jan. 1981.
"High-performance single-mode fiber polarization-independe isolators", Optics Letters, vol. 15, No. 8, Apr. 15, 1990.

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