Apparatus for suppressing backward propagation along an optical

Details Apparatus for suppressing backward propagation along an optical Apparatus for suppressing backward propagation along an optical

1988-02-17

1989-09-12

Arnold, Bruce Y.

G02F 109

Patent

active

048654299

ABSTRACT:
An optical isolator comprising a cylindrical magnet magnetized in a direction parallel to the axis of rotational symmetry thereof, a Faraday rotator disposed in a center space of the cylindrical magnet, a pair of beam splitters capable of serving as a polarizer or an analyzer arranged on both sides of said Faraday rotator with inclination of 45.degree. relative to each other, characterized in that the outer diameter Do, the inner diameter Di and the length L of the cylindrical magnet are in the range defined by ##EQU1## where .alpha.=Do/Di. In the case of a multi-stage optical isolator, the Faraday rotators and the beam splitters are arranged alternately in tandem, and any two adjacent cylindrical magnets are arranged with their magnetic poles of the same polarity facing each other.

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