Zhang Fan, Yun Han, Wang Yun, Lu Zeqin, Chrostowski Lukas, Jaeger Nicolas A F
Opt Lett. 2017 Jan 15;42(2):235-238. doi: 10.1364/OL.42.000235.
We design and demonstrate a compact broadband polarization beam splitter (PBS) using a symmetric directional coupler with sinusoidal bends on a silicon-on-insulator platform. The sinusoidal bends in our PBS suppress the power exchange between two parallel symmetric strip waveguides for the transverse-electric (TE) mode, while allowing for the maximum power transfer to the adjacent waveguide for the transverse-magnetic (TM) mode. Our PBS has a nominal coupler length of 8.55 μm, and it has an average extinction ratio (ER) of 12.0 dB for the TE mode, an average ER of 20.1 dB for the TM mode, an average polarization isolation (PI) of 20.6 dB for the through port, and an average PI of 11.5 dB for the cross port, all over a bandwidth of 100 nm.
我们在绝缘体上硅平台上设计并演示了一种紧凑型宽带偏振分束器（PBS），它采用了带有正弦弯曲的对称定向耦合器。我们的PBS中的正弦弯曲抑制了横向电（TE）模式下两个平行对称条形波导之间的功率交换，同时允许横向磁（TM）模式下的最大功率传输到相邻波导。我们的PBS标称耦合器长度为8.55μm，在100nm带宽内，TE模式的平均消光比（ER）为12.0dB，TM模式的平均ER为20.1dB，直通端口的平均偏振隔离（PI）为20.6dB，交叉端口的平均PI为11.5dB。
