OPTICAL MODULE AND OPTICAL COUPLING STRUCTURE

• Main Authors: SANO TOMOMI, ARAO HAJIME, YAKABE SHO, HARUMOTO MICHIKO
• Format: Patent
• Language: English; Japanese
• Published: 01.10.2015
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SEMICONDUCTOR DEVICES

PROBLEM TO BE SOLVED: To provide an optical module and an optical coupling structure which can decrease a coupling loss between an optical waveguide and an optical fiber without increasing a coupling loss between a light-emitting element and the optical waveguide.SOLUTION: A transmission-side core 61b is formed in such a manner that broadening of light at a time when incident light P1 reaches an incident-side end face 61f of the transmission-side core 61b is smaller in a width direction intersecting the light incident direction than a width of the transmission-side core 61b, and that broadening of light in an optical axis direction at an end face 61h opposing to the incident-side end face 61f at a time when the incident light P1 reaches the end face 61h is smaller than a size Lin a height direction of the transmission-side core 61b. A cross-sectional shape of the transmission-side core 61b in a cross section perpendicular to the optical axis direction is an oblong that is short in the width direction. 【課題】発光素子と光導波路との間の結合損失を増加させず、光導波路と光ファイバとの間の結合損失を低減できる光モジュール及び光結合構造を提供する。【解決手段】送信側コア６１ｂは、送信側コア６１ｂの入射側端面６１ｆに入射光Ｐ１が到達した段階における光の広がりが、光入射方向と交差する幅方向において送信側コア６１ｂの幅よりも小さくなるように形成されており、入射側端面６１ｆと対向する端面６１ｈに入射光Ｐ１が到達したと仮定したときの該端面６１ｈにおける光軸方向の光の広がりが、送信側コア６１ｂの高さ方向の大きさＬcore-zよりも小さくなるように形成されている。光軸方向に垂直な断面における送信側コア６１ｂの断面形状は、幅方向に短い長方形状である。【選択図】図１１