Author(s): Li, MX (Li, Mingxuan); Zhao, YR (Zhao, Yiru); Dai, SX (Dai, Shuangxing); Yu, WQ (Yu, Wenqi); Li, JY (Li, Jinye); Lin, T (Lin, Tao); Zhang, ZK (Zhang, Zhike); Liu, JG (Liu, Jianguo)

Source: OPTICS COMMUNICATIONS Volume: 495 Article Number: 127088 DOI: 10.1016/j.optcom.2021.127088 Published: SEP 15 2021

Abstract: A novel optical isolator for fundamental transverse electric (TE) mode light based on asymmetric Mach- Zehnder interferometer (MZI) configuration is proposed. Asymmetric Mach-Zehnder interferometer (MZI) configuration is employed to generate nonreciprocal phase shift (NRPS). The optical isolator is implemented by applying Ce: YIG thin film on lithium niobate on insulator (LNOI). The NRPS of LN/Ce: YIG composite waveguides with different geometric sizes are calculated. The 30 dB isolation bandwidth is larger than 48.3 nm and the total simulated insertion loss is as low as 2.736 dB for NRPS waveguides with a length of 504.5 mu m at a wavelength around 1550 nm. Considering the state-of-art technology, the fabrication tolerances and a suitable process are discussed. Besides, a wavelength-tuning optical isolator is designed to cancel the phase deviation.

Accession Number: WOS:000668937100003

ISSN: 0030-4018

eISSN: 1873-0310

Full Text: https://www.sciencedirect.com/science/article/pii/S0030401821003370?via%3Dihub