Electrically controlled optical device

US5220627A · kind A · utility

Assignee

• NIPPON TELEGRAPH AND TELEPHONE CORPORATION · JP

Inventors

• Kenji Kawano · Yokohama, JP
• Toshinori Nozawa · Kunitachi, JP
• Hiromichi Jumonji · Yokosuka, JP
• Tsutomu Kitou · Mito, JP
• Osamu Mitomi · Nagoya, JP
• Toshio Suzuki · Chiba, JP
• Mitsuaki Yanagihashi · Mitaka, JP
• Kazuto Noguchi · Atsugi, JP

Key dates

• Filing date: Apr 3, 1992
• Grant date: Jun 15, 1993
• Expiry date: Apr 3, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/0356
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An electrically controlled optical device effective index includes a traveling wave electrode, a shield conductor and a thick buffer layer of a low dielectric constant. The thickness of an overlaid layer disposed between the traveling wave electrode and the shield conductor as well as the thickness of the buffer layer is so determined that an effective index of a microwave transmitted through the traveling wave electrode approaches an effective index of light transmitted through an optical waveguide, and that a microwave conductor loss is reduced, and that a characteristic impedance of said traveling wave electrode approaches a characteristic impedance of an associated external microwave circuit.