High-speed pulse laser phase randomization testing device and method

Abstract

The invention discloses a high-speed pulse laser phase randomization testing device which comprises a laser source, wherein the laser source is connected with the input end of a beam splitter, the beam splitter is connected with a sagnac interference ring long arm and an FM reflection short arm, and front and back pulse reflection light of the FM reflection short arm and the sagnac interference ring long arm generates interference at the beam splitter; a detection module which is used for converting an optical signal generated by interference into an electric signal and testing interference optical power at the same time; and a data analysis module which is used for detecting the pulse randomness of the laser based on the interference light power and the electric signal of the interference light. Whether the phase of the laser is random or not is qualitatively judged by testing the visibility ratio of the interference fringes in the continuous light and pulse light modes of the laser, testing can be conducted only through an optical power meter, the optical path is simple, and cost is low; te single pulse interference peak value is sampled at a time, sampling errors caused by time jitter are eliminated, quantitative judgment of the laser phase randomness is carried out based on the randomness of the interference peak, and the detection accuracy of the laser phase randomness is improved.

Description

technical field [0001] The invention belongs to the technical field of quantum communication, and more specifically, the invention relates to a high-speed pulse laser phase randomization testing device and method. Background technique [0002] Quantum secure communication technology is based on the principle that the unknown quantum state cannot be cloned and the Heisenberg uncertainty principle, and it is theoretically proved to be an absolutely safe encryption technology. At present, the quantum key distribution (QKD) system based on the BB84 protocol has the highest maturity. In the past ten years, scientific research teams such as Toshiba’s Cambridge Research Institute, the University of Geneva, Japan’s NEC and NICT, the US NIST, and the University of Science and Technology of China have achieved 1GHz to 1.25 GHz BB84 practical QKD system has broad application prospects in military affairs, government affairs, customs and banks. [0003] For the BB84 quantum key distrib...

AI Technical Summary

Problems solved by technology

In the prior art, most of the tests are performed through front and rear pulse interference and ADC sampling pulse peak data is controlled by FPGA, but for high-speed QKD systems, the pulse repetition frequency is high, the pulse interval is short, the time jitter between pulses and the long and short arms of the MZ interference ring Due to the inconsistency of the pulse polarization with different optical paths, the interference is affected by the polarization and the environment changes are unstable, which has a great impact on the test results.

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