Patent ID: 8817370
Filing Date: 2014-08-26
Classification: G02F,H01F,Y10T

Abstract:
1. A magnetic circuitfor a Faraday rotator, in which a Faraday element of a Faraday rotator is arranged, comprising: a first magnet, including a first through-hole extending in an axial direction, magnetized in a direction perpendicular to said axial direction and directing away from said first through-hole; a second magnet, including a second through-hole extending in said axial direction, magnetized in a direction perpendicular to said axial direction and directed toward said second through-hole; and a third magnet arranged between said first magnet and said second magnet in said axial direction and magnetized in a direction parallel to said axial direction and directed from said first magnet toward said second magnet, wherein said third magnet includes a third through-hole, extending in said axial direction to connect said first through-hole and said second through-hole with each other, in which said Faraday element is arranged, and a first high coercive force region is provided in the vicinity of at least an inner peripheral surface of said third through-hole of said third magnet.