.Study on 8DPSK of multi-phase modulation technology based on CSRZ[J].Optoelectronics Letters,2011,7(2):151-153 Study on 8DPSK of multi-phase modulation technology based on CSRZ 张霞 School of Physics Science and Information Engineering, Liaocheng University； Key Laboratory of Optical Communication and Lightwave Technologies, Ministry of Education, School of Science, Beijing University of Posts and Telecommunications； Abstract:       A new modulation format in optical fiber communication system, the eight differential phase shift keying (8DPSK) of multi-phase modulation technology based on carrier-suppressed return-to-zero (CSRZ) is proposed in this paper. The formulae of CSRZ-8DPSK modem methods are derived theoretically and the methods are demonstrated. Spectra based on CSRZ and CSRZ-8DPSK modulation methods and their eye diagrams by simulation with MATLAB are obtained. The results show that the CSRZ-8DPSK modulation methods have narrower spectra with higher efficiency. The performance of eye diagrams is also much satisfactory after demodulation, suggesting some possible applications of the methods in the next generation of optical fiber communications. Hits: 3881 Download times: 247 View Full Text    Download reader