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Tonggang Zhao

Beijing University of Posts and Telecommunications

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Featured researches published by Tonggang Zhao.

Chinese Optics Letters | 2010

Study of FSK/IM orthogonal modulation system with optical Manchester-coded payload

Rui Zhou; Xiangjun Xin; Qi Zhang; Kun Zhao; Tonggang Zhao; Chongxiu Yu

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.

Archive | 2011

Optical orthogonal frequency division multiplexing (OFDM) dynamic allocation-based passive access network system and method

Xiangjun Xin; Bo Liu; Qi Zhang; Yongjun Wang; Xiaoli Yin; Tonggang Zhao; Jianxin Ma; Lan Rao; Xiaolei Zhang; Lijia Zhang; Xin Guan; Yuting Hao; Yulu Chen; Quanxin Yuan; Jiao Liu

Archive | 2010

Millimeter wave WDM-ROF (Wavelength Division Multiplexing-Radio Over Fiber) system and method based on supercontinuum

Xiangjun Xin; Bo Liu; Qi Zhang; Yongjun Wang; Jianxin Ma; Tonggang Zhao; Lan Rao; Xiaoli Yin; Xinzhu Sang; Zhongxiu Yu; Kuiru Wang; Xiaolei Zhang; Quanxin Yuan; Lijia Zhang; Xing Zhang

Archive | 2011

Mini type internet of things networking system based on millimeter wave and method thereof

Xiangjun Xin; Bo Liu; Xiaoli Yin; Yongjun Wang; Qi Zhang; Tonggang Zhao; Jianxin Ma; Lan Rao; Xiaolei Zhang; Lijia Zhang; Quanxin Yuan; Yuhang Dai; Jinglun Tu; Wenwen Fan; Jiao Liu; Xing Zhang; Xin Guan

Archive | 2011

Differential 8-phase shift keying (D8PSK)/amplitude shift keying (ASK) orthogonal light label switching method and system based on differential biphasic codes

Xiangjun Xin; Lijia Zhang; Qi Zhang; Yongjun Wang; Xiaoli Yin; Tonggang Zhao; Jianxin Ma; Lan Rao; Xiaolei Zhang; Bo Liu; Xing Zhang; Shaosong Bian; Quanxin Yuan; Jiao Liu

Archive | 2011

Method and device for erasing and interposing D8PSK/ASK orthogonal optical label based on EAM

Xiangjun Xin; Lijia Zhang; Qi Zhang; Yongjun Wang; Xiaoli Yin; Tonggang Zhao; Jianxin Ma; Lan Rao; Xiaolei Zhang; Bo Liu; Xing Zhang; Quanxin Yuan; Jiao Liu

Archive | 2010

All-optical packet switching method, edge node and core nodes

Jie Fang; Shuwen Li; Jianxin Ma; Xinzhu Sang; Kuiru Wang; Yongjun Wang; Xiangjun Xin; Xiaoli Yin; Zhongxiu Yu; Qi Zhang; Tonggang Zhao

Archive | 2012

100Gbit/s optical signal transmitting system and method based on optical orthogonal frequency division multiplexing

Xiangjun Xin; Lijia Zhang; Qi Zhang; Yongjun Wang; Xiaoli Yin; Tonggang Zhao; Jianxin Ma; Lan Rao; Xiaolei Zhang; Bo Liu; Jiao Liu; Kaimin Wang; Rui Ji; Tian Cao; Quanxin Yuan; Xing Zhang; Xin Guan

Archive | 2011

D8PSK/IRZ quadrature modulation-based optical label switching method and system

Lijia Zhang; Xiangjun Xin; Qi Zhang; Yongjun Wang; Jianxin Ma; Tonggang Zhao; Lan Rao; Xiaoli Yin; Xinzhu Sang; Chongxiu Yu; Kuiru Wang; Xiaolei Zhang; Bo Liu; Xing Zhang; Quanxin Yuan; Jiao Liu

Archive | 2011

High speed optical transmission system and method based on TCM-64QAM code modulation

Xiangjun Xin; Lijia Zhang; Qi Zhang; Yongjun Wang; Tonggang Zhao; Jianxin Ma; Lan Rao; Xiaoli Yin; Jiao Liu; Bo Liu; Tian Cao; Kaimin Wang; Rui Ji; Quanxin Yuan; Xing Zhang; Xin Guan

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