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    • 3. 发明授权
    • Method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a top cladding
    • 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
    • US07609917B2
    • 2009-10-27
    • US12079930
    • 2008-03-28
    • Farnaz ParhamiLiang ZhaoFan Zhong
    • Farnaz ParhamiLiang ZhaoFan Zhong
    • G02B6/12G02B6/10G02B6/34
    • G02B6/12023G02B6/126
    • A method and apparatus for controlling waveguide birefringence by selection of a waveguide core width for a tuned top clad is described herein. In one example, a dopant concentration within a top cladding material is between 3-6% (wt.). 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.
    • 本文描述了通过选择用于调谐顶部包层的波导芯宽度来控制波导双折射的方法和装置。 在一个实例中,顶部包层材料内的掺杂剂浓度在3-6%(重量)之间。 给定一个调整的顶部包层组成,预先选择波导芯的宽度,使得双折射最小化,即零或接近零。 通过计算在顶部包层中的应力在温度变化中的分布来确定波导芯的期望宽度。 根据这种应力分布,确定阵列波导光栅中波导的偏振相关波长与可变宽度之间的关系。 对于给定的波导宽度范围,该关系确定偏振相关波长的零值或近零值。 因此,可以选择波导的宽度使得偏振相关波长最小化。