Mr. Changran Hu Profile

Changran Hu

at Huazhong Univ. of Science and Technology

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Proceedings Article | 18 March 2021 Paper

TE0-TM0 mode hybridization in an LNOI ridge waveguide

An Pan, Changran Hu, Cheng Zeng, Jinsong Xia

Proceedings Volume 11780, 117800Y (2021) https://doi.org/10.1117/12.2589978

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The thin film lithium niobate (LNOI) platform has attracted great interest towards integrated photonics devices, featuring high-speed electrooptical responsion and low-loss light propagation. To enhance the function of passive devices in LNOI, the fundamental mode hybridization (TE₀, TM₀) in an LNOI ridge waveguide is therotically analysed and experimentally demonstrated. A microring resonator with Q-factor of 1.78 million is fabricated, revealing the appearance of the mode hybridization by observing sudden jumps in the FSRs of both fundamentally resonating modes. The central wavelength of the fundamental mode hybridization is designed at 1562nm and observed at 1537nm. Potential applications include fundamental mode conversion, polarization rotation, polarization splitter, and polarization insensitive waveguides in optical receiver module.

Proceedings Article | 18 March 2021 Paper

Ultra-low loss edge coupler based on thin-film lithium niobite

Changran Hu, An Pan, Tingan Li, Yuheng Liu, Shiqi Tao, Cheng Zeng, Jinsong Xia

Proceedings Volume 11780, 1178008 (2021) https://doi.org/10.1117/12.2588828

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Lithium niobate (LN) devices have been used in optical communication and nonlinear optics widely due to its impressive optical properties. Thin-film lithium niobate on insulator (LNOI) improves performances of LN-based devices further. But a high-efficient fiber-chip optical coupler for the LNOI-based devices for practical applications is still absent. In this article, we demonstrate a wide-band, highly efficient and polarization independent edge coupler based on LNOI fabricated by planar semiconductor process. The measured ultra-high numerical aperture fiber (UHNAF)-to-chip optical coupling loss at 1550 nm is 0.54 dB/facet (0.59 dB/facet) for TE(TM). The coupler has the coupling loss lower than 1dB/facet for both TE and TM light at wavelengths longer than 1527nm.

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