OPTICAL MODULATOR

PROBLEM TO BE SOLVED: To provide an optical modulator which operates at high speed, is low in driving voltage and is low in bias voltage.SOLUTION: An optical modulator includes: a substrate having an electro-optical effect; an optical waveguide formed on the substrate to guide light; a high-frequenc...

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Bibliographische Detailangaben
Hauptverfasser:	KAWAZURA EIJI, NANAMI MASAYA, KITO TSUTOMU, SATO YUJI, KONO KENJI
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an optical modulator which operates at high speed, is low in driving voltage and is low in bias voltage.SOLUTION: An optical modulator includes: a substrate having an electro-optical effect; an optical waveguide formed on the substrate to guide light; a high-frequency electrode which is formed on one surface side of the substrate and applies a high-frequency electric signal that modulates light; and a bias electrode for applying a bias voltage to light. In the optical modulator which is formed of a nest type optical waveguide having a child Mach-Zehnder optical waveguide on branched optical waveguides of a parent Mach-Zehnder optical waveguide, respectively, the optical waveguide includes at least one inversion optical waveguide which makes a direction of propagating light into an approximately U shape, the high-frequency electrode is arranged on one U-shaped arm, and the bias electrode is arranged on another U-shaped arm.