Optical isolator and method for preparing same

Details Optical isolator and method for preparing same Optical isolator and method for preparing same

1991-04-16

1992-11-03

Arnold, Bruce Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359484, 501 15, 501 22, G02B 109, C03C 824

Patent

active

051610493

ABSTRACT:
An optical isolator according to the present invention comprises a first polarizer, a Faraday rotator and a second polarizer which are adhered to one another in this order and held in a cylindrical magnet, wherein at least one adhered and supported portion comprises a low melting point glass 7 and 8. As the low melting point glass 7, 8, there may be used, for instance, those mainly comprising lead oxide and boron oxide; zinc oxide, lead oxide and boron oxide; lead oxide, boron oxide and thallium oxide; phosphoric acid and aluminum oxide; zinc oxide and boron oxide; and phosphorous pentaoxide, aluminum oxide and boron oxide. In the optical isolator according to the present invention, a low melting point glass is used for adhering the structural parts for the optical isolator, there is not observed any outgassing phenomenon due to the raise in ambient temperature as in the isolator which is assembled with an adhesive and the discrepancy of the optical axis due to the expansion of the adhesive. As a result, the isolator of the present invention has stable optical properties. Moreover, the underlying plating layer is not peeled off as has been observed in the isolators which is assembled through soldering.

REFERENCES:
patent: 4068923 (1978-01-01), Toida
patent: 4449096 (1984-05-01), Doriath et al.
patent: 4686678 (1987-08-01), Ohta et al.
patent: 4770505 (1988-09-01), Okazaki
patent: 4804256 (1989-02-01), Wilson
patent: 4983481 (1991-01-01), Yu
patent: 5016129 (1991-05-01), Goto et al.

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