摘要
We study the performance of an orthogonal modulation system with frequency-shift keying（FSK） label and optical Manchester-coded（MC） payload.Simulation result shows that by introducing an optical MC payload,the available extinction ratio（ER） value of a FSK and intensity modulation（IM） orthogonal modulation system can be improved from 5 to 9 dB for system optimization,exhibiting great advantages over the traditional non-return-to-zero（NRZ） payload.Besides,the bit error rate（BER） characteristics of both label and payload show a more remarkable advantage than that of NRZ coding,verifying itself as a perfect candidate for the payload coding method in orthogonal modulation systems.
We study the performance of an orthogonal modulation system with frequency-shift keying（FSK） label and optical Manchester-coded（MC） payload.Simulation result shows that by introducing an optical MC payload,the available extinction ratio（ER） value of a FSK and intensity modulation（IM） orthogonal modulation system can be improved from 5 to 9 dB for system optimization,exhibiting great advantages over the traditional non-return-to-zero（NRZ） payload.Besides,the bit error rate（BER） characteristics of both label and payload show a more remarkable advantage than that of NRZ coding,verifying itself as a perfect candidate for the payload coding method in orthogonal modulation systems.
基金
supported by the National Natural Science Foundation of China(No.60677004)
the National"863"Program of China(Nos.2007AA03Z447 and 2009AA01Z220)
the Teaching and Scientific Research Foundation for the Returned Overseas Chinese Scholars form the Ministry of Education of China
the Program for New Century Excellent Talents in University of China(No.NECT-07-0111).
