发明授权
US06850670B2 Method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a top clad
有权
通过选择顶部包层的波导芯宽度来控制波导双折射的方法和装置
- 专利标题: Method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a top clad
- 专利标题(中): 通过选择顶部包层的波导芯宽度来控制波导双折射的方法和装置
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申请号: US09894049申请日: 2001-06-28
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公开(公告)号: US06850670B2公开(公告)日: 2005-02-01
- 发明人: Farnaz Parhami , Liang Zhao , Fan Zhong
- 申请人: Farnaz Parhami , Liang Zhao , Fan Zhong
- 申请人地址: US CA San Jose
- 专利权人: Lightwave Microsytstems Corporation
- 当前专利权人: Lightwave Microsytstems Corporation
- 当前专利权人地址: US CA San Jose
- 代理机构: Morrison & Foerster LLP
- 主分类号: G02B6/12
- IPC分类号: G02B6/12 ; G02B6/126 ; G02B6/34
摘要:
A method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a tuned top clad is described herein. A tuned top cladding describes a pre-existing dopant concentration within a top cladding material. Given a tuned top cladding composition, a width of the waveguide core is pre-selected such that birefringence is minimized, i.e., a zero, or near zero. The desirable width of the waveguide core is determined by calculating the distribution of stress in the top cladding over a change in temperature. From this distribution of stress, a relationship between the polarization dependent wavelength and variable widths of the waveguide in the arrayed waveguide grating are determined. This relationship determines a zero value, or near zero value, of polarization dependent wavelength for a given range of waveguide widths. Accordingly, the width of the waveguide may be selected such that the polarization dependent wavelength is minimized.