Journal of Digital Information Management Zou Dan, Zhang YueJin 13 4 2015 http://dline.info/fpaper/jdim/v13i4/v13i4_8.pdf Chaos, a kind of noise like signals, generated by deterministic nonlinear Dynamical system, has good auto correlation performance. Previous researches indicate that broad bandwidth chaos can be easily obtained by semiconductor laser subjecting optical feedback, optoelectronic feedback, or external optical injection under an appropriate conditions. Break detection for WDM-PON needed to solve the multi-branch; node density problem for the realization of high-precision positioning of each branch proposed a breakpoint detection method based broadband chaotic light lasers, with the help of powerful and elastic computation ability and storage capacity, put proposes a framework of service platform with a collaborative service model of hybrid cloud in the cloud computing environment. On the basis of analysing the characteristics of broadband chaotic sources on a preliminary simulation results show that this method can be highly accurate positioning WDM-PON branch break point location, spatial resolution of 7cm and independent of the detection distance.