Mr. Di Wu Profile

Di Wu

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Proceedings Article | 14 August 2024 Paper

Non-volatile optical waveguide switch based on electro-thermic chalcogenide phase change material

Mengtao Yang, Yuanhao Cui, Zihang Yang, Guiju Zhang, Di Wu

Proceedings Volume 13248, 132480N (2024) https://doi.org/10.1117/12.3033272

KEYWORDS: Optical switching, Waveguides, Silicon, Crystallization, Power consumption, Chalcogenides, Optical transmission, Electrodes

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A non-volatile 2×2 optical waveguide switch structure is proposed based on silica wafer integrated with chalcogenide Ge₂Sb₂Se₄Te₁ (GSST) quaternary phase change film and silicon strip waveguide. By applying external electrical pulses on indium tin oxide (ITO) electrodes which are deposited on GSST film, the phase change film can be heated and non-volatile switched back and forth between the two phase states for turning on or off the optical transmission paths. Such an electrically controlled waveguide switch structure is established and simulated by using COMSOL Multiphysics software. The response time of the optical switch is determined by the phase transition time of the amorphous and crystal states of GSST. The results show that it requires about 0.5μs from crystal state to amorphous state with a pulse voltage of 16V, and the energy consumption is 11.36nJ. The amorphous state will remain non-volatile until the next specific pulse arrives. The response time is about 1.3μs from amorphous state to crystal state with a pulse voltage of 5V, and the energy consumption is 2.41nJ. The heat dissipation times are both under 3.0μs. The working wavelength is set at C-band of optical communication with central wavelength of 1550 nm. This type of non-volatile optical waveguide switch presents fast responses, low energy consumption and smart characteristics, which provides an optional possible implementation approach for the construction of large-scale and high-capacity on-chip optical switching networks.

Proceedings Article | 16 August 2017 Open Access

To promote the engineering innovative abilities of undergraduates by taking projects as the guidance and competitions as the promotion

Yishen Xu, Di Wu, Daqing Chen, Jihua Gu, Lei Gao

Proceedings Volume 10452, 1045240 (2017) https://doi.org/10.1117/12.2266119

KEYWORDS: Engineering education, Consciousness, Optoelectronics, Information science

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According to the inherent requirements of education for talents' knowledge, quality and comprehensive ability and the major training goals of optoelectronics information science and engineering, in order to enhance the undergraduates' comprehensive practical ability and consciousness of innovation, we carried out the reforms of teaching method and teaching mode, which took the training programs of innovation and entrepreneurship for undergraduates, extracurricular academic research fund, "Chun-Tsung Scholar" program or research projects of their tutors as the guidance, and took the all levels of relevant discipline competitions as the promotion. And the training mainline of engineering innovation talents as "undergraduate's tutorial system →innovative training program or tutor’s research project →academic competition →graduation projects (thesis)" was constructed stage by stage by combining the undergraduates' graduation projects and their participated academic competition into one for improving the quality of the graduation projects (thesis). The practical results of the last several years illuminate that the proposed training model can effectively stimulate the students' awareness of autonomous learning, enhance their comprehensive ability of analyzing and solving problems and improve their ability of engineering practice and innovation as well as their teamwork spirit.

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