Chinese Academy of Sciences

Shanghai Academy of Agricultural Sciences

Shanghai Zhongke Shenguang Optoelectronics Industry Co., Ltd.

The Third Research Institute of Ministry of Public Security

Lijuan Wang

Yu Chen Zhou

Jing Xu

Yu Ying Wang

Bo Wang

Wenhui Zhang

Yiqun Bruce Wang

Zhiyong Lu

Jianfeng Sun

Jianjie Gao

Fujian Zhang

Yongdong Deng

Hongjuan Han

Yueli Xi

Yiming Bao

Quanhong Yao

Rihe Peng

Yongsheng Tian

Xiaoyan Fu

Peipei Hou

Zhenjun Li

Ling Rong

Zhuying Yang

Zhenyi Zhang

Autotrophic nitrogen fixation genes and an autotrophic nitrogenase expression cassette for plants and uses thereof are disclosed. Nitrogenase related genes of nitrogen fixation gene cluster fromsp. are specifically optimized by plant expression patterns through synthetic biology, to obtain autotrophic nitrogen fixation genes, which are then constructed into plant constitutive expression units. The expression units are assembled in a plant expression vector by isocaudarner cloning method and transformed into plants, thereby realizing autotrophic nitrogen fixation of the plants.

Autotrophic nitrogen fixation genes and an autotrophic nitrogenase expression cassette for plants and uses thereof

An apparatus and method herein efficiently couple spatial light to optical fiber light for achieving stability of an optical axis without a position sensor. The basic concept of the method includes: first, obtaining, according to a theoretical coupling efficiency model, a model parameter by means of fitting calculation; second, using a four-point tracking algorithm to calculate an optical fiber nutation trajectory according to the optical fiber nutation principle; and finally, using the nutation trajectory to calculate the position deviation of a central point. The optical axis is ensured to be stable by correcting the position deviation, and the high coupling efficiency remains. The method is used for the stability of the optical axis in a space coherent laser communication DPSK link. The high efficiency coupling is a key technology of long-distance, high bit rate transmission in space laser communication, and is significant in the development of inter-satellite optical communications.

Apparatus and method for coupling the spatial light to the optical fiber light for achieving the stability of an optical axis without a position detector

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Shanghai, China

Lijuan Wang