OPTICAL ISOLATOR

PROBLEM TO BE SOLVED: To make it possible to obtain a clear aperture of a desired size by preventing the reduction of the clear aperture of an optical isolator laminated with a polarizer and a Faraday rotator. SOLUTION: In the optical isolator integrated with the polarizer and the Faraday rotator through stress buffer materials, is the central position of an aperture for transmission of a light signal disposed at the i-th stress buffer material from a light signal incident position is arranged by shifting the distance expressed by an equation from the light signal incident position to the light signal incident position of the i-th optical element when the refractive index of the i-th optical element arranged in the fore stage of the i-th stress buffer material from the light signal incident side is n1, the thickness of the optical element is t1, and the angle of inclination of the light signal incident surface of the i-th optical element when a direction perpendicular to a light signal incident direction is used as a reference is θ. COPYRIGHT: (C)2005,JPO&NCIPI