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以缩短马赫-曾德尔(M-Z)电光调制器分支波导为目的,将有机聚合物非对称结构的脊波导应用于S弯波导中。采用半矢量有限差分光束传输分析法,系统地分析了不同参数下采用非对称脊波导的三种常见弯波导,即正弦弯、圆弧弯和余弦弯分支波导的TM00光场传输损耗,并与采用对称脊波导的结构相比较。研究表明,在芯层厚度h=1.5μm、脊高为0.3μm、脊宽w=4μm、分支高度G=11μm的情况下,当脊波导短边芯层平板宽度s≥2μm时,在相同传输损耗条件下,正弦弯、圆弧弯和余弦弯分支波导长度分别可减少40%、30%和25%,该结果对有机聚合物M-Z调制器中分支波导的设计具有一定的参考价值。
For the purpose of shortening the Mach-Zehnder (M-Z) electro-optic modulator branch waveguide, the ridge waveguide with asymmetric organic polymer structure is applied to the S-bend waveguide. The semi-vector finite-difference beam transmission analysis method is used to systematically analyze the TM00 optical field transmission losses of sinusoidal, arc-curved and cosine-curved branching waveguides with asymmetric ridged waveguide under different parameters. Structures using symmetrical ridged waveguides are compared. The results show that in the case of core layer thickness h = 1.5μm, ridge height 0.3μm, ridge width w = 4μm and branch height G = 11μm, Under the condition of loss, the length of sinusoidal, arc and cosine bent branch waveguide can be reduced by 40%, 30% and 25%, respectively. This result has certain reference value for the branch waveguide design in organic polymer MZ modulator.