| 摘要 |
PURPOSE:To constitute the titled circuit so that a multiple light polarization state is not varied, and the circuit is not influenced by a polarized wave dispersion, by cascading a birefringence medium so that quick axes are orthogonal to each other, and forming a Kerr medium. CONSTITUTION:A multiple light of signal light 1 and control light 2 is propagated through an optical fiber 30 of a Kerr medium and separated into both light beams by a polarizing prism 4. This fiber 30 is constituted by cascading birefringence medium parts 31, 32 in which the respective quick axes are orthogonal to each other, a phase difference by a birefringence of a transmission light is compensated each other and the influence is negated each other. Accordingly, a multiple light polarization state is not varied, the influence of a polarized wave dispersion is not received, the Kerr substance is made long and large, and multiplexing and separation of light can be executed at a high speed and stably.
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