WAVEGUIDE TYPE OPTICAL CIRCUIT

PROBLEM TO BE SOLVED: To provide a waveguide type optical circuit showing superior characteristics, even if a plurality of optical branching/coupling circuits are possessed, by configuring the optical circuit to suppress re-coupling of radiant light in the optical branching/coupling circuit of the p...

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Bibliographische Detailangaben
Hauptverfasser:	HIDA YASUHIRO, INOUE YASUYUKI, TAKATO NORIO, TAMURA MUNEHISA, KOMINATO TOSHIMI, NIITSU TOMOHARU, TSUDA SHINICHI
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 a waveguide type optical circuit showing superior characteristics, even if a plurality of optical branching/coupling circuits are possessed, by configuring the optical circuit to suppress re-coupling of radiant light in the optical branching/coupling circuit of the poststage. SOLUTION: The waveguide type optical circuit has a waveguide structure composed of a lower clad, a core arranged on the upper face of the lower clad, and an upper clad covering the core, and includes at least a first and a second two optical branching/coupling circuits. The first and second optical branching/coupling circuits have a structure in which waveguide light and radiant light are coupled, wherein the input waveguide of the second optical branching/coupling circuit is connected to the output waveguide of the first optical branching/coupling circuit. The refractive index of the upper clad is made lower than that of the lower clad for the purpose of avoiding the re-coupling of the radiant light of the first optical branching/coupling circuit, through propagation in the lower clad, with the waveguide light in the second optical branching/coupling circuit. COPYRIGHT: (C)2008,JPO&INPIT