Directional coupler type optical function element

Abstract

Abstract PURPOSE:To reduce the distortion of light output power by providing an input optical waveguide with a control mechanism for maximizing its insertion efficiency and providing the other optical waveguide with a function control means for optical modulation, optical demultiplexing, etc. CONSTITUTION:Light incident on the input side optical waveguide 9 through a lens 7 travels to a coupling optical waveguide 11. At this time, a control power source 13 for the quantity of light input is impressed to an electrode 10 for light input quantity control to obtain proper coupling efficiency. Then, a modulating signal 14 is impressed to an electrode 12 for modulation to obtain a modulated optical signal. In this case, the modulation point is easily varied by controlling the DC voltage of a power source 14 for modulation to a proper value. Consequently, a variety of evil influence accompanying the modulating voltage impression is reduced and a modulator which generates a less-distortion optically modulated signal is obtained.

Inventors

• 👤 Yasushi Matsui
• 👤 松井　康
• 👤 Masato Ishino
• 👤 正人 石野

Bibliographic Details