Tao S H
School of Physical Science & Technology, Central South University, Changsha, China.
Opt Express. 2011 Jan 17;19(2):906-12. doi: 10.1364/OE.19.000906.
A coupling and splitting device comprising a width taper and a spatial-modulated subwavelength grating waveguide (SSGW) is proposed. The width taper is a waveguide with increasing width and the SSGW is a waveguide grating whose width and thickness are constant but the filling factor increases along the light propagation. Thus, the effective index of the subwavelength grating increases according to the effective medium theory. Light of orthogonal polarizations from a single-mode fiber can be coupled efficiently with the two parallel tapers. Furthermore, the coupled lights of orthogonal polarizations in the two tapers can be further split with connecting bent waveguides. Fabrication of the device is fully compatible with current complementary metal oxide semiconductor technology.
提出了一种包括宽度渐变器和空间调制亚波长光栅波导（SSGW）的耦合与分光器件。宽度渐变器是一种宽度逐渐增加的波导，而SSGW是一种波导光栅，其宽度和厚度恒定，但填充因子沿光传播方向增加。因此，根据有效介质理论，亚波长光栅的有效折射率会增加。来自单模光纤的正交偏振光可以与两个平行的渐变器高效耦合。此外，两个渐变器中正交偏振的耦合光可以通过连接弯曲波导进一步分光。该器件的制造与当前的互补金属氧化物半导体技术完全兼容。
