Polarization control unit

Details Polarization control unit Polarization control unit

1996-08-23

1998-04-14

Ben, Loha

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359484, 3242441, 356350, G02F 109

Patent

active

057399433

ABSTRACT:
Light beams emitted from an optical fiber are converted into parallel light beams by a lens, and then allowed to pass through a Faraday device, followed by being converged to an incident end of the optical fiber by a lens. The Faraday device is applied with a magnetic field in a direction of the optical axis thereof from a coil. Moreover, the Faraday device is applied with a magnetic field in a direction perpendicular to the optical axis by a pair of magnets. When an electric current flowing in a coil 74 is changed from I to -I, the direction of a synthesized magnetic field can be rotated. Therefore, by arbitrarily changing the electric current flowing in the coil, polarization of transmission light can be controlled.

REFERENCES:
patent: 4539521 (1985-09-01), Matsumoto
patent: 4812767 (1989-03-01), Taketomi
patent: 4997282 (1991-03-01), Pavlath
patent: 5050968 (1991-09-01), Ohara
patent: 5535046 (1996-07-01), Shirai et al.
Technical Digest of the Fifth Optoelectronics Conference, pp. 8-9, Jul. 1994, Reinhold NOE, et al., "Wavelength-Selective Polarimeter and Polarization-Independent Depolarizer Based on Ti:LiNbO.sub.3 Acoustooptical TE-TM Converters".

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