National University of Defense Technology

Central South University

Ping Xu

Junjie Wu

Yang Wang

Xiaogang Qiang

Chengming Sun

Xiang Fu

Shuguang Yao

Kai Xu

Chao Wu

Bowen Tan

Qi Huang

Jiangfang Ding

Zhaijun Lu

Yingwen Liu

Mingtang Deng

Yong Peng

Anqi Huang

A startup stage protection device used in Electric Multiple Unit (EMU) train coupler experiment is provided between two test cars. The startup stage protection device is arranged between and tightly abuts two test cars at the starting stage of the experiment to receive a compressing force in place of the coupler. The startup stage protection device separates from the two test cars after the end of the starting stage.

Startup stage protection device for experiment of EMU train coupler

The present invention discloses a method for calibrating controllable phase shifters in a multi-stage staggered Mach-Zehnder interferometer structure on an optical chip, aiming to solve the problem of calibrating the controllable phase shifters in a configurable optical network of the multi-stage staggered Mach-Zehnder interferometers. The technical solution is to calibrate the controllable phase shifters that can be calibrated in the optical network; and then to constitute calibration conditions for and calibrate inner phase shifters that has not been; and finally to constitute calibration conditions for and calibrate outer phase shifters that is not calibrated.

Method for calibrating controllable phase shifters in multi-stage staggered Mach-Zehnder interferometer on optical chip

Reconfigurable nonlinear frequency conversion waveguide chip based on Mach-Zehnder interferometer coupled micro-ring, the method is based on the integration of waveguide components of phase-adjustable Mach-Zehnder interferometers (MZI) and micro-ring resonators. The chip is illustrated by FIG.. The MZI couples light and photons into and output of the micro-ring resonator and controls the micorings' quality factor thus optimize the nonlinear frequency conversion processes inside the ring by the phase-modulator inside the MZI. The micro-ring resonator enables the nonlinear optical generation of new frequency light beams and quantum light sources based on the second-order or third-order nonlinear optical process. Other optical waveguide components in region I and III of FIG.are linear optical circuits for power splitting of pump beams and post-process of generated light beams or photons.

Reconfigurable nonlinear frequency conversion waveguide chip based on Mach-Zehnder interferometer coupled microring

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Changsha, China

Ping Xu