Abstract: With the continuous development of smart grid, more and more new types of power communication services appear gradually. The traditional power communication optical transmission network based on Wavelength division multiplexing technology is difficult to meet the multi-granularity business transmission scenario. Elastic optical network can achieve network resource scheduling at the subwavelength level. It is the key technology of next generation power communication optical network. In order to solve the problem that the existing routing methods can not take into account both the protection requirements of power communication services and the elastic optical network routing and spectral allocation, a mathematical model for the work and backup routing of optical power communication network is proposed to describe the optimization goals and constraints of the work and backup routing conditions, such as the latency difference of the work and backup paths, the risk balance of the whole network, etc. Then, based on this mathematical model, an optimal routing algorithm based on risk balance for backup and work routes is presented. The algorithm is designed to find a pair of backup dual routes with low latency and balanced risk for power communication services. The results show that this method not only has a lower latency difference and blocking rate of work and backup routes (52.2% lower than the comparison algorithm), but also performs well in risk balance (up to 57.5% reduction).

Key words: power communications optical network, work and backup path latency difference, risk balance