Optical isolator

Details Optical isolator Optical isolator

G - Physics

02

B

G02B 27/28 (2006.01) G02F 1/09 (2006.01)

Patent

CA 2080904

ABSTRACT An optical isolator for use in an optical communication system is independent of the plane of polarization of an incident beam and does not allow this plane to change on the outgoing side. The isolator comprises a first parallel flat double refractive crystal substance; a first Faraday rotor for rotating the plane of polarization of the beam; a second parallel flat double refractive crystal substance; a second Faraday rotor for rotating the plane of polarization in the direction opposite to that in which the first rotor rotated such plane; a third parallel flat double refractive substance; and permanent magnets for magnetizing the Faraday rotors. Since the Faraday rotors rotate the plane of polarization in opposite directions, this plane does not change between the incident and outgoing sides. The system has the advantage of being insensitive to changes of temperature or of the wavelength of the light.

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