Mr. Yang Xu Profile

Yang Xu

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Proceedings Article | 10 November 2020 Paper

Research on a device of eliminating stray light in transceiver of laser communication

Yang Song, Wenyi Chai, Yongming Hu, Enshi Qu, Wei Xin, Yang Xu

Proceedings Volume 11604, 1160403 (2020) https://doi.org/10.1117/12.2579470

KEYWORDS: Laser communications, Stray light, Wave plates, Glasses, Transceivers, Telecommunications, Modal analysis

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There is a broad application of laser communication. This technology makes a great contribution to information exchanging between a station on ground and a satellite in space or between two satellites in space. Transceiver of space laser communication usually shares one optical path for compact, lightweight, low cost design. The most important thing is that the laser communication should have low wave aberration, low polarization loss and high isolation. Transmitting and receiving signals use one optical path, which makes negative influence on the isolation in system. It is a big challenge for engineers or designers to ensure the high isolation. The paper made a design about the key device in the transceiver, which was sensitive to isolation. The basic idea of this design was using the special structure style and optical material. It could eliminate stray light efficiently. It was proved that the process of manufacturing and assembling was not difficult. The device proposed in this paper could improve the efficiency and quality of laser communication. Moreover, the paper made mechanical simulation of device to prove that the device was safe.

Proceedings Article | 17 May 2019 Paper

Structural parameters optimization of lens hood based on a kind of surrogate model

Yang Song, Wenyi Chai, Wei Xin, Yang Xu, Yongming Hu

Proceedings Volume 11170, 1117002 (2019) https://doi.org/10.1117/12.2531069

KEYWORDS: Optimization (mathematics), Finite element methods, Laser systems engineering, Structural design, Laser development

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With the wide use of earth-based laser communication system, more and more engineers like to pursue the design of lightweight structure. Nowadays, engineers often firstly depend on the project experience to design the lens hood, then make analysis based on finite element method to verify its feasibility, but it costs too much time. The paper attempts to give a new optimization design method. Surrogate model are widely used in the fields of aerodynamics parameters optimization, but barely used in design of optical structure. The paper makes an optimal design about lens hood with wide aperture based on surrogate model. First of all, the paper generates some samples by finite element method; secondly, uses the samples to get the surrogate model by surface interpolation; then finds the optimal solution by surrogate model and constraint conditions. The aperture of the lens hood in this paper is 450 mm. One end of the lens hood is attached to main structure, and the other end is free. Middle part of the lens hood is supported by rods which are made of carbon fiber. The optimization variables in this paper is the thickness of the lens hood and the location of the supports robs. The purpose of the optimization is to find the case that the weight is light and displacement of the free end is small. It will not let the miscellaneous light make a negative effect on incident or outgoing path of light. In other words, it will ensure the quality of imagining or effect of detection. The appropriate solution is found by the method proposed in this paper.

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