Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1992-09-04
1993-09-14
Dzierzynski, Paul M.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359249, 359282, 359283, 359324, 385 11, G02B 5172
Patent
active
052454657
ABSTRACT:
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.
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Tarucha, et al., "Waveguide-Type Optical Modulator of GaAs Quantum Well Double Heterostructures Using Electric Field Effect on Exciton Absorption," Japanese Journ. App. Phys., vol. 24, No. 6, Jun. 1985, pp. 442 through 444.
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Oda Hitoshi
Okuda Masahiro
Tomita Yasuo
Canon Kabushiki Kaisha
Dzierzynski Paul M.
Nguyen Kiet T.
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