In the multi-service requirement of the next generation of optical networks,differentiated services should be provided,and the transmission quality of signal and the path reliability are two important parameters of service class differentiation.A new dynamic routing and wavelength assignment(RWA) algorithm supporting service-differentiated provision,which takes account of both requirements of the signal transmission quality and the path reliability,is proposed.The numerical results from simulation show that the algorithm can not only overcome the impact of impairment on signal transmission quality and guarantee lightpath reliability,but also offer the service-differentiated lightpath according to its class.
The principle of a novel orthogonal modulation format of differential 8-1evel phase-shift keying amplitude-shift keying （D8PSK/ASK） with differential bi-phase encoding （DBC） is introduced. Based on it, an optical labeling scheme, in which the payload is 100 Gbit/s D8PSK signal and the label is 10 Gbit/s DBC-ASK signal, is proposed and simulated. The results arc compared with other current schemes, and the effects of transmission range, modulation extinction ratio （ER） and received power on system performance are analyzed, respectively. The results show that the spectrum efficiency and bit error rate （BER） are improved greatly, and when the modulation ER is increased to 11 dB, the balanced performance between the payload and label is achieved.
