The offline BPA targets to maximize the number of waveband paths under the condition of minimum number of wavelengths,and solves the RWA problem with waveband grooming to reduce cost.

• 该方法在构造环算法的基础上,将波段优先函数引入路由与波长分配的计算,在路由与波长分配过程中同时解决波段合并问题。