Abstract:
PROBLEM TO BE SOLVED: To provide a low-voltage type optical modulator, having a symmetric structure in which the polarization of any one of branched waveguides formed on a substrate is inverted, and the two branched waveguides are simultaneously controlled by a center electrode formed on a top portion thereof, thereby ensuring a low-voltage drive and embodying the characteristics of there being no signal distortions due to chirping. SOLUTION: The modulator comprises: a substrate; an optical waveguide composed of an input portion, a pair of first and second portions branch portions branched off from the input portion, and an output portion where the first and second branch portions are coupled, all of which are formed inwardly on the top surface of the substrate; a polarization inversion region, polarized and inverted by a region of the substrate on the basis of between the first and second branch portions; first to third recessed grooves formed, by etching the portions of the substrate adjacent to sides of the first and second branch portions of the optical waveguide; a buffer layer formed on the top surface of the substrate; a center electrode, formed on a top surface of the buffer layer over the first and second branch portions of the optical waveguide, located on and in between the first and third grooves; and first and second side electrodes, independently of the center electrode and formed on the top surface of the buffer layer adjacent to the first and third grooves, respectively. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide an integrated optical modulator which can minimize an influence of chromatic dispersion and has a more simplified configuration by connecting a carrier wave band modulator using a double sideband modulation method and an intermediate frequency band modulator using a single sideband modulation method in series, and to provide a method for manufacturing the integrated optical modulator. SOLUTION: The integrated optical modulator comprises the carrier wave band modulator using the double sideband modulation method and the intermediate frequency band modulator using the single sideband modulation method. The carrier wave band modulator and the intermediate frequency band modulator are connected in series. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PURPOSE: A flexible fiber module, a variable device package thereof, and a manufacturing method thereof are provided to maximize a wavelength variable conversion efficiency by restricting the passing path of light in a micro region. CONSTITUTION: A light oscillation module of a wavelength conversion device package comprises a laser diode temperature control part(110), a laser diode heat emitting block(120), a laser diode mounting block(130), and a laser diode temperature measurement sensor(140). The light oscillation module comprises a laser diode chip and a laser diode power monitoring photo diode. A flexible fiber module(200) irradiates light which is emitted from the light oscillation module to a wavelength modulated light. A polarization inversion waveguide chip module comprises a polarization inversion waveguide chip(310), a polarization inversion waveguide chip mounting block(320), a temperature measurement sensor(330), and a polarization inversion chip temperature control part(350).