标题： 片上旋转偏振方向耦合器由飞秒激光直写制造 显示英文标题

标题： On-chip Rotated Polarization Directional Coupler Fabricated by Femtosecond Laser Direct Writing

摘要： 我们提出了一种在光子芯片上的旋转偏振方向耦合器（RPDC）。 我们展示了一种双轨方法来改变相邻轨道之间的折射率分布，并形成具有任意双折射光学轴的单个波导。 我们构建了一个RPDC，其中两个轴旋转的波导在强耦合状态下进行耦合。 获得的消光比平均分别为16dB和20dB，对应于正交偏振。 我们进行了斯托克斯矢量的重构以测试我们的RPDC的投影性能，并观察到在0$^\circ$和45$^\circ$RPDC中完美初始化状态的平均保真度分别高达98.1%和96.0%。 显示英文摘要

摘要： We present a rotated polarization directional coupler (RPDC) on a photonic chip. We demonstrate a double-track approach to modify the distribution of refractive index between adjacent tracks and form a single waveguide with arbitrary birefringent optical axis. We construct a RPDC with the two axis-rotated waveguides coupled in a strong regime. The obtained extinction ratios on average are about 16dB and 20dB for the corresponding orthogonal polarizations. We perform the reconstruction of Stokes vector to test the projection performance of our RPDC, and observe the average fidelities up to 98.1% and 96.0% for the perfectly initialized states in 0$^\circ$ and 45$^\circ$ RPDCs respectively.