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    • 8. 发明授权
    • Optical polarization-state converting apparatus for use as isolator,
modulator and the like
    • 用作隔离器,调制器等的光偏振状态转换装置
    • US5245465A
    • 1993-09-14
    • US939427
    • 1992-09-04
    • Yasuo TomitaHitoshi OdaMasahiro Okuda
    • Yasuo TomitaHitoshi OdaMasahiro Okuda
    • G02F1/095
    • G02F1/0955
    • In a polarization-state converting apparatus for use as an optical isolator, an optical modulator and the like, there are provided a waveguide including a magnetic semiconductor, a device for applying a magnetic field to the waveguide in a first predetermined direction, a device for applying an electric field to the waveguide in a second predetermined direction, and a mode conversion is caused via electrooptic and magnetooptic effects due to the electric and magnetic fields to change the polarization state of light propagating through the waveguide. When used as an optical isolator, the optical isolation is performed to compensate for degradation of the mode conversion rate due to a phase mismatch between light incident upon the waveguide and light emerging from the waveguide. When used as an optical modulator, the optical modulation of light emerging from the waveguide is performed by varying the electric field and an optical isolation function is effected while compensating for degradation of the mode conversion rate due to a phase mismatch between light incident upon the waveguide and light emerging from the waveguide.
    • 在用作光隔离器,光调制器等的偏振态转换装置中,提供了一种波导,包括磁性半导体,用于沿第一预定方向向波导施加磁场的装置,用于 在第二预定方向上向波导施加电场,并且通过由电场和磁场引起的电光和磁光效应引起模式转换,以改变通过波导传播的光的偏振状态。 当用作光隔离器时,执行光学隔离以补偿由于入射到波导管的光和从波导出射的光之间的相位失配导致的模式转换率的劣化。 当用作光调制器时,通过改变电场来执行从波导出射的光的光调制,并且在补偿由于入射到波导上的光之间的相位失配导致的模式转换率的劣化的同时实现光隔离功能 和从波导出射的光。