Optical isolator

Details Optical isolator Optical isolator

1992-05-27

1994-01-11

Scott, Jr., Leon

Coherent light generators

Having an applied magnetic field

372703, H01S 300

Patent

active

052788539

ABSTRACT:
A high quality small-sized polarization independent optical isolator for use in an optical fiber communication system, wherein a pair of magneto-optical elements having Faraday rotation angle of 45.+-.5 are contained in permanent magnets and arranged between a pair of birefringent crystal plates for splitting and combining an optical path of a laser light, and two polarizers arranged in parallel as being bounded on the midpoint of separated optical paths are interposed between the pair of magneto-optical elements, whereby a degree of worsening the optical isolation can be kept minimum against variations of an environmental temperature and wave length.

REFERENCES:
patent: 4178073 (1979-12-01), Uchida
patent: 4698820 (1987-10-01), Brandle, Jr. et al.
patent: 5044713 (1991-09-01), Mozer et al.
Optics Letters, vol. 15, No. 8, Apr. 15, 1990, New York US pp. 449-451; Chang K. W. et al: High-performance single-mode fiber polarization-independent isolators.
Patent Abstracts of Japan, vol. 4, No. 51 (P-007) Apr. 17, 1980 & JP-A-55 022 729 (NTT) Feb. 18, 1980 *abstract* & JP-B-58 028 561 (NTT).
Patent Abstracts of Japan, vol. 6, No. 188 (p-144) Sep. 28, 1982 & JP-A-57 100 410 (Fujitsu Ltd) Jun. 22, 1982 *abstract* & JP-B-61 058 809 (Fujitsu Ltd).

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