OPTICAL WAVEGUIDE AND OPTICAL INTEGRATED ELEMENT

• Main Authors: GOTODA MITSUNOBU, TAKABAYASHI MASAKAZU
• Format: Patent
• Language: English; Japanese
• Published: 27.10.2014
• Subjects: BASIC ELECTRIC ELEMENTS; 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; DEVICES USING STIMULATED EMISSION; ELECTRICITY; 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

PROBLEM TO BE SOLVED: To provide an optical waveguide that is able to restrict increase in the oscillation line width of a single mode LD and to provide an optical integrated element that has the optical waveguide.SOLUTION: An optical waveguide comprises: an active optical waveguide area 14; a passive optical waveguide area 13 having an effective refractive index different from that of the active optical waveguide 14; and a junction area 25 that joins the active optical waveguide area 14 and the passive optical waveguide area 13, and has a waveguide width greater than the active optical waveguide area 14 and the passive optical waveguide area 13. The waveguide width of the active optical waveguide area 14 and the waveguide width of the passive optical guide area 13 continuously spread over the junction area 25 from the active optical waveguide area 14 and passive optical guide area 13. The proportion of the active optical waveguide area 14 to the passive optical guide area 13 in a cross-section perpendicular to the traveling direction of light passing through the junction area 25 continuously changes in the traveling direction of light. 【課題】単一モードＬＤの発振線幅の増大を抑制することが可能な光導波路および当該光導波路を有する光集積素子を提供する。【解決手段】光導波路は、活性光導波路領域１４と、活性光導波路領域１４の等価屈折率とは異なる等価屈折率を有する受動光導波路領域１３と、活性光導波路領域１４と受動光導波路領域１３とを接合し、活性光導波路領域１４の導波路幅および受動光導波路領域１３の導波路幅よりも広い導波路幅を有する接合領域２５とを備え、活性光導波路領域１４の導波路幅および受動光導波路領域１３の導波路幅は、活性光導波路領域１４および受動光導波路領域１３から接合領域２５に渡って連続的に広がり、接合領域２５を通過する光の進行方向に対して垂直な断面における、活性光導波路領域１４と受動光導波路領域１３とが存在する割合は、光の進行方向に沿って連続的に変化する。【選択図】図１