OPTICAL FILTER AND WAVELENGTH-VARIABLE LASER ELEMENT

• Main Authors: HIRATANI TAKUO, SAITO KUNIMASA, FUJIWARA NAOKI, FUJISAWA TAKESHI, SATO TAKANORI
• Format: Patent
• Language: English; Japanese
• Published: 30.03.2023
• Subjects: BASIC ELECTRIC ELEMENTS; DEVICES USING STIMULATED EMISSION; ELECTRICITY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

To provide an optical filter and a wavelength-variable laser element capable of monitoring features.SOLUTION: The optical filter comprises: a first loop mirror 20; a second loop mirror 25; a first waveguide 12 optically connected to the first loop mirror and the second loop mirror; a second waveguide 14 optically connected to the first loop mirror and the second loop mirror; a first access waveguide 10 optically connected to the first waveguide; a second access waveguide 16 optically connected to the second waveguide; and an output part 30. The first loop mirror includes a first loop waveguide 22 and a first multiplexer/demultiplexer 24. The second loop mirror includes a second loop waveguide 26 and a second multiplexer/demultiplexer 28. The output part includes a third loop waveguide 32, a third multiplexer/demultiplexer 31, a third waveguide 36, and a fourth waveguide 38. The third loop waveguide is optically connected to the second loop waveguide and the third multiplexer/demultiplexer. The third waveguide and the fourth waveguide are optically connected to the third multiplexer/demultiplexer.SELECTED DRAWING: Figure 1 【課題】特性をモニタすることが可能な光フィルタおよび波長可変レーザ素子を提供する。【解決手段】第１ループミラー２０と、第２ループミラー２５と、第１ループミラーおよび第２ループミラーと光学的に結合する第１導波路１２と、第１ループミラーおよび第２ループミラーと光学的に結合する第２導波路１４と、第１導波路と光学的に結合する第１アクセス導波路１０と、第２導波路と光学的に結合する第２アクセス導波路１６と、出力部３０と、を具備し、第１ループミラーは、第１ループ導波路２２と第１合分波器２４とを有し、第２ループミラーは、第２ループ導波路２６と第２合分波器２８とを有し、出力部は、第３ループ導波路３２と、第３合分波器３１と、第３導波路３６と、第４導波路３８とを有し、第３ループ導波路は、第２ループ導波路および第３合分波器と光学的に結合し、第３導波路および第４導波路は、第３合分波器と光学的に結合する光フィルタ。【選択図】図１