Ultra-Compact and Ultra-Broadband Polarization-Insensitive Mach–Zehnder Interferometer in Silicon-on-Insulator Platform for Quantum Internet Application

• DOI: 10.3390/photonics8100455
• Publication Date: 2021-10-21T01:31:26Z
• Authors: Jingjing Zhang; Zhaojian Zhang; Chao Ma; Xuefeng Chen; Liping Liu; Wei Zhao; Xiaoxian Song; Haiting Zhang; Yu Yu; Huan Chen; Junbo Yang
• Keywords: Extinction ratio

Polarization dependence in integrated silicon photonics has a detrimental effect on the manipulation of quantum state with different polarizations technology. Those limits have profound implications for further technological developments, especially photonic internet. Here, we propose polarization-independent Mach–Zehnder interferometer (MZI) structure based 340 nm-thick silicon-on-insulator (SOI) platform. The MZI facilitates low loss, broad operating bandwidth, and large tolerance fabrication imperfection. We achieve an excess loss <10% extinction radio >18 100 nm bandwidth (1500∼1600 nm) both transverse electric (TE) magnetic (TM) modes. numerically demonstrate interference visibility 99% (PDL) 0.03 at 1550 nm. Furthermore, by using principle phase compensation self-image, shorten length waveguide taper almost order magnitude transmission >95% TE TM polarizations. Up to now, proposed could significantly improve integration promote development monolithic