REFLECTIVE FILTER ELEMENT AND WAVELENGTH TUNABLE LASER ELEMENT

• Main Authors: KAWAKITA YASUMASA, HIGA YASUTAKA
• Format: Patent
• Language: English; Japanese
• Published: 22.08.2019
• Subjects: BASIC ELECTRIC ELEMENTS; DEVICES USING STIMULATED EMISSION; ELECTRICITY

To provide a reflection filter element that can be easily finely adjusted in phase and a wavelength tunable laser element using the reflection filter element.SOLUTION: A reflection filter element includes a ring resonator filter including a ring-shaped waveguide and two arm portions each optically coupled to the ring-shaped waveguide, and a two-branch unit including a light input/output port through which light is input and output and two branch ports from which the light input from the light input/output port, which is branched into two, is output, and in which the two arm portions are connected to the two branch ports, and a phase adjustment unit is provided on at least one of the two arm portions.SELECTED DRAWING: Figure 1 【課題】位相の微調整がしやすい反射フィルタ素子およびこれを用いた波長可変レーザ素子を提供すること。【解決手段】反射フィルタ素子は、リング状導波路と、各々が前記リング状導波路と光学的に結合する２つのアーム部と、を有するリング共振器フィルタと、光が入出力する光入出力ポートと、前記光入出力ポートから入力された光が２分岐して出力される２つの分岐ポートとを有し、前記２つのアーム部が各々前記２つの分岐ポートに接続された２分岐部と、を備え、前記２つのアーム部の少なくともいずれか一方に位相調整部が設けられている。【選択図】図１