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    • 83. 发明授权
    • Optical attenuator
    • 光衰减器
    • US07580593B2
    • 2009-08-25
    • US12278428
    • 2007-03-22
    • Yuichi UchidaNobuyuki MiyagawaTadahiro YamajiTakuya Matsumoto
    • Yuichi UchidaNobuyuki MiyagawaTadahiro YamajiTakuya Matsumoto
    • G02F1/035G02F1/295G02B6/26G02B6/42G02B6/10G02B6/00
    • G02F1/0147G02F1/011G02F2201/16G02F2203/06G02F2203/48
    • In an optical attenuator, there are a first optical waveguide 3A connected to an input optical waveguide 1, a second optical waveguide 3B connected to an output optical waveguide 2 and a connecting optical waveguide 4, which are connected with each other in series. A first recess 13A and a second recess 13B are formed in a positional relationship of opposite directions with respect to an axial direction of an optic axis of light that is inputted through the input optical waveguide 1, transmitted through the first optical waveguide 3A, the connecting optical waveguide 4 and the second optical waveguide 3B and outputted from the output optical waveguide 2. Further, a first optical attenuating heater 6A and a second optical attenuating heater 6B are arranged so as to produce opposite refractive index distributions in the axial direction of the optic axis of the light that is inputted through the input optical waveguide 1, transmitted through the first optical waveguide 3A, the connecting optical waveguide 4 and the second optical waveguide 3B and outputted from the output optical waveguide 2, in the first optical waveguide 3A and the second optical waveguide 3B. The optical attenuator capable of reducing a polarization dependent loss for a desired optical attenuation is provided without utilizing an interference of lights.
    • 在光衰减器中,存在与输入光波导1连接的第一光波导3A,与输出光波导2连接的第二光波导3B和连接光波导4,它们彼此串联连接。 第一凹部13A和第二凹部13B以相对于通过输入光波导1输入的光的光轴的轴向的相反方向的位置关系形成,透过第一光波导3A,连接 光波导4和第二光波导3B,并从输出光波导2输出。此外,第一光衰减加热器6A和第二光衰减加热器6B布置成在光学器件的轴向上产生相反的折射率分布 通过输入光波导1输入的光的第一光波导3A和第二光波导3A中输出的第一光波导3A,连接光波导4和第二光波导3B并从输出光波导2输出的光 第二光波导3B。 提供能够减少所需光衰减的偏振相关损耗的光衰减器,而不利用光的干扰。