Ogawa Kensuke, Guan Ning, Goi Kazuhiro, Sakuma Ken, Tan Yong Tsong, Yu Ming-Bin, Teo Selin Hwee Gee, Lo Guo-Qiang
Optics and Electronics Laboratory, Fujikura Ltd., 1440, Mutsuzaki, Sakura, Chiba 285-8550, Japan.
Opt Express. 2010 Feb 1;18(3):2002-9. doi: 10.1364/OE.18.002002.
New design of optical waveguides is presented to synthesize Bragg grating waveguides without inducing birefringence. In the design, waveguide core has a thin trench on the top surface of the core and width of the trench is modulated concurrently with width modulation of the waveguide core. Effective refractive index profiles in Bragg grating waveguides are obtained by a differential inverse scattering algorithm and converted to waveguide width profiles by using the new core design. This procedure allows design of non-birefringent Bragg grating waveguides on planar substrate. The method is applied to the design of chromatic dispersion compensators. For characterization of Bragg grating waveguides, analysis based on short-time Fourier transform of Bragg grating response waveforms is presented.
本文提出了一种光波导的新设计，用于合成布拉格光栅波导而不产生双折射。在该设计中，波导芯在其顶表面有一条细沟槽，沟槽的宽度与波导芯的宽度调制同时进行。通过差分逆散射算法获得布拉格光栅波导中的有效折射率分布，并利用新的芯设计将其转换为波导宽度分布。该过程允许在平面衬底上设计无双折射的布拉格光栅波导。该方法应用于色散补偿器的设计。为了表征布拉格光栅波导，提出了基于布拉格光栅响应波形的短时傅里叶变换的分析方法。
