偏振脱敏高隔离度高分子波导分波器设计

Design of High-Isolation Polyimide Waveguide Wavelength De-multiplexer with Polarization-insensitivity

提出了一种新的高分子波导分波器结构,用以改善波长串扰以及偏振变动、波长带宽等引起的劣化影响.主要技术特征是采用两支参量不同的波导来构成非对称定向耦合器.报告了用非对称定向耦合器构成的马赫-泽德尔干涉型波导分波器的结构特点、基本工作原理和光学特性,详细讨论了器件的设计原理和器件性能优化的处理方法.采用三维波束传播法做了仿真验证,结果表明,该器件在1 550±5 nm和1 310±5 nm的波长带域上、对两个正交偏振态均实现了串扰小于-40 dB的高隔离度分波特性.

To restrain crosstalk caused by different wavelength and deteriorate affect through polarization variation and non-monochromaticity of the source, a new wavelength de-multiplexer structure was proposed. The leading technical characteristic is the asymmetric directional coupler composed of two waveguides with different parameters. The structure features, fundamental and optical characteristic of Mach Zehnder interferometer,which are composed of asymmetric directional couplers, were reported. The design fundamental and optimizing method were discussed in detail. The design result was verified by 3D BPM simulation,showed that the crosstalk value of each output port is less than -40 dB when the input beam is 1 550±5 nm and 1 310±5 nm wavelength and two orthogonal polarizations.