MODE CONVERTER AND METHOD FOR MANUFACTURING THE SAME

• Main Authors: SAITO KUNIMASA, FUJISAWA TAKESHI, WADA MASAKI, NAKAJIMA KAZUHIDE, SAKAMOTO YASUSHI
• Format: Patent
• Language: English; Japanese
• Published: 25.05.2022
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To provide an optical device for achieving broad-band mode conversion with a simple configuration.SOLUTION: A mode converter comprises: an input waveguide 1 that can propagate a mode; an output waveguide 2 that can propagate a mode; and a third waveguide 3 that is connected between the input waveguide 1 and the output waveguide 2. A waveguide width W3 of at least part of the third waveguide 3 is different from a waveguide width W1 of a connection portion of the input waveguide 1 and a waveguide width W2 of a connection portion of the output waveguide 2. In at least part of the third waveguide 3, a wave front in a normal propagation direction of an input field being overlap of one or more specific modes input from the input waveguide 1 matches a wave front in a reverse propagation direction of an output field being overlap of modes different from the specific modes and output from the output waveguide 2.SELECTED DRAWING: Figure 1 【課題】簡易な構造で、広帯域なモード変換を実現するための光デバイスを提供する。【解決手段】モードを伝搬可能な入力導波路１と、モードを伝搬可能な出力導波路２と、入力導波路１及び出力導波路２の間に接続された第３の導波路３と、を備え、第３の導波路３の少なくとも一部の導波路幅Ｗ３が、入力導波路１の接続部分の導波路幅Ｗ１及び出力導波路２の接続部分の導波路幅Ｗ２と異なり、第３の導波路３の少なくとも一部において、入力導波路１から入力される１以上の特定のモードの重ね合わせである入力フィールドの順伝搬方向の波面と、出力導波路２に出力される前記特定のモードとは異なるモードの重ね合わせである出力フィールドの逆伝搬方向の波面とが、一致する、モード変換器である。【選択図】図１