All-fiber Multi-channel Source Of Quantum-correlated Photon Pairs In Telecom Band

All-fiber quantum-correlated photon-pair source attracts much attention because of its excellent properties,such as a good compatibility with existing optical fiber communication systems,small size and good portability.Aiming at the practicality of quantum-correlated photon-pair source,with a consideration of adapting to existing optical fiber communication systems, we construct an all-fiber multi-channel quantum-correlated photon-pair source in telecom band.The main contents of the thesis are as follows:Firstly, we introduce the present situation and future trend of the quantum-correlated source,pointing out the influence of pump source and fiber to attain an all-fiber quantum-correlated source.Secondly,We introduce the basic theory about the produce of photon pairs in fiber,that is spontaneous four wave mixing(SFWM),and some factors in fiber that affect the quality of the source.Important parameters relevant to quantum- correlated source are given in the part of quantum theory.It's a preparation for experiments on the characteristics of the quantum-correlated photon pairs.Finally, multi-channel quantum-correlated photon-pair source is built and experiments are conducted to analyze the output characteristics.In the section,we introduce the experimental configuration and experimental results.Meanwhile,the purity of source is analyzed.In the thesis,we make several improvements concentrating on the shortcomings of an all-fiber quantum-correlated source our lab once built.First,the output channels are extended to multi channels,with the center wavelengths of signal/idler channels 1567.13nm/1554.13 nm and 1569.59nm/1551.72 nm,respectively.Second,high nonlinear fiber(HNLF) with a high nonlinear index are usd instead of dispersion-shifted fiber(DSF),which shortens the length of fiber.As a result,quantum-correlated photon-pair source takes up less space.At last,increase the repetitive frequency of pump pulse exported by a man-made mode-locked fiber laser,to an extent of 41 MHz.Experimental results give a confirmation of the correlation between signal and idler photon pairs,multi-channel quantum-correlated source is achieved.