POLARIZATION INDEPENDENT OPTICAL CONTROL ELEMENT

Japanese Patent JP3250712

B2

PURPOSE: To make high-speed operation possible with low driving voltage with a small size and without depending on the polarization state of input light by specifying the optical waveguides formed on an optical substrate, a wavelength plate and the lengths of turn-back optical waveguides having reflection layers and traveling-wave type electrodes.
CONSTITUTION: The traveling-wave type electrodes 3 are arranged on the optical waveguides 2 formed on the z plate LiNbO3 substrate 1 having an electro-optical effect of, for example, a Mach-Zehunder type optical intensity modulator and the luminous intensity conversion type turn-back optical waveguide parts 10 are formed in the optical waveguides 2. A quarter-wave plate 4 formed with a high-reflection film 5 is joined to the end faces of these waveguide parts by inclining its main axis at 45° with the substrate plane. Interaction regions 13, 14 of the optical waveguides 2 and the traveling-wave type electrodes 3 are formed by the voltage induced by impressing microwaves on the traveling- wave type electrodes 3. The lengths of the optical waveguides 2, the turn-back optical waveguide parts 10 and the traveling-wave type electrodes 3 are set at the lengths at which the effective traveling time of the microwaves and light in the interaction regions 13, 14 nearly coincides.

Hiroshi Miyazawa
Osamu Mitomi
Noguchi Hitori
Yasuyuki Inoue
Shinji Ando

JP15949995A

January 28, 2002

June 26, 1995

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Nippon Telegraph and Telephone Corporation

G02F1/035; G02F1/225; (IPC1-7): G02F1/035

JP4355714A
JP5232417A

【文献】1994年電子情報通信学会春季大会予稿集 C-339

Yoshikazu Tani (1 person outside)

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