Magneto-optical pickup device having phase compensating circuitr

Details Magneto-optical pickup device having phase compensating circuitr Magneto-optical pickup device having phase compensating circuitr

1997-03-31

1998-09-08

Nelms, David C.

Optical waveguides

Integrated optical circuit

385 8, 385 3, 385 2, 360114, 269 13, 269112, G02B 612, G11B 1100

Patent

active

058057447

ABSTRACT:
Even when manufacturing of a waveguide is fluctuated and an optical parameter is fluctuated or a wavelength of emitted light is fluctuated, a phase difference between two intrinsic modes can be compensated (positive integral multiple of .pi.). Thus, it is possible to prevent a reproduced signal from being deteriorated by elliptically polarized light. A magneto-optical reproducing pickup includes an optical waveguide (4) for guiding light reflected on a magneto-optical recording medium to a differential photo-detecting unit (9) side and phase compensating circuitry for compensating a phase difference between light components of a TE mode an a TM mode included in reflected light. In this case, the phase compensating circuitry comprises the optical waveguide (4) composed of a substrate formed of an electrooptic crystal and a thin film having a light refractive index higher than that of the substrate formed on the substrate, phase control electrodes (21a and 21b) for applying an electric field to the optical waveguide (4) in the direction along the TM mode and a feedback circuit (11).

REFERENCES:
patent: 4801184 (1989-01-01), Revelli
patent: 5323409 (1994-06-01), Laskoskie et al.
patent: 5442719 (1995-08-01), Chang et al.

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