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【期刊论文】Ultrawide-band microwave amplification in the optical domain
陈宏伟, Hongwei Chen, Minghua Chen, Jian Zhang, MEMBER SPIE, and Shizhong Xie
July 2007/Vol. (7),-0001,():
-1年11月30日
Ultrawide-band microwave amplification in the optical domain is proposed that covers the frequency range from 10 MHz to 10 GHz with over 10 dB gain. A partly carrier-suppressed optically carried microwave signal is generated and amplified by erbium-doped fiber amplifier (EDFA) in this scheme.
microwave amplification, optical domain, erbiumdoped fiber amplifier (, EDFA),
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【期刊论文】Advanced Labeling Schemes for Future Optical Switching Network
陈宏伟, Hongwei Chen
Network Architectures, Management, and Applications IV, edited by Yong Hyub Won, Gee-Kung Chang, Ken-ichi Sato, Jian Wu, Proc. of SPIE Vol. 6354, 63540L, (2006) ,-0001,():
-1年11月30日
All-optical label switching (AOLS) is a potential technique which is introduced to fully use the bandwidth capacity in future optical networks and the packet operations are mostly carried out in the optical layer. The key issue in the AOLS approach is the method of coding the optical label onto the packet as it directly determines the structure and the performance of the optical core router as well as the channel bandwidth efficiency and the transmission quality of the packet and its label. With the bit rate increasing above 40Gb/s, new labeling scheme is needed to enhance the spectral efficiency. In this paper, recent advanced labeling schemes for future high speed AOLS network are reviewed, especially the new schemes demonstrated in Tsinghua University, China. Two novel labeling scheme based on vestigial sideband (VSB) modulation are mainly introduced both in principle and experiment. One is compact wavelength labeling scheme which achieves high spectral efficiency since the wasteful double sideband of 40Gb/s has been reduced to vestigial sideband. This scheme can be easily carried out by using optical filters. Another is polarization shift keying scheme with VSB payload which has high spectral efficiency near to 0.8bit/s/Hz. This scheme utilizes two polarization orientations to carry the label signal and causes little distortions between the label and payload. And this scheme is also independent of the payload bit rate which is a good character for future networks. Both the two schemes have little power penalties after long distance SMF transmission and are promising to be used in beyond 40Gb/s optical networks.
wavelength label, polarization shift keying, VSB-CSRZ, all-optical label switching
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陈宏伟, Hongwei Chen, MEMBER SPIE, Minghua Chen, Shizhong Xie, and Bingkun Zhou
April 2006/Vol. 45(4),-0001,():
-1年11月30日
We experimentally investigate the influence of vestigial sideband (VSB) filtering in a 40-Gbit/s optical system. Two kinds of optical filters and different pseudorandom bit sequences (PRBS) are used in experiment. The results show that optical filter ramp and PRBS length will cause different impacts in a VSB carrier suppressed return-to-zero system.
vestigial sideband, pseudorandom bit sequence length, filtering impact
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陈宏伟, Hongwei Chen, Minghua Chen, Shizhong Xie, and Bingkun Zhou
May 1, 2006, Vol. 31, No. 9, OPTICS LETTERS 1187 0146-9592,-0001,():
-1年11月30日
We propose and experimentally demonstrate a polarization shift keying label and a vestigial sideband carrier-suppressed return-to-zero payload scheme for a 43 Gbit/s all-optical label switching network. This scheme has a narrow channel bandwidth and a low penalty due to polarization mode dispersion impairments, which confirm it as a candidate technique for the next generation of optical networks.
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【期刊论文】A Novel Composite Method for Ultra-Wideband Doublet Pulses Generation
陈宏伟, Hongwei Chen, Member, IEEE, Minghua Chen, Ciyuan Qiu, and Shizhong Xie, Senior Member
IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 19, NO. 24, DECEMBER 15, 2007 2021,-0001,():
-1年11月30日
A novel composite approach to generate ultra-wideband (UWB) doublet pulses in optical domain through an electrical Gaussian pulse is proposed and demonstrated in this letter. Two pulses with reversed polarity generated by polarization modulation are fed into a differential group delay device and a semiconductor optical amplifier (SOA) wherein the optical pulse profile is modified. Doublet pulses are obtained after optical–electrical detection due to gain saturation and recovery mechanism in the SOA. The fractional bandwidth of doublet pulses exceeds 180%, fulfilling the UWB requirements.
Doublet pulse, polarization modulation, semiconductor optical amplifier (, SOA), , ultra-wideband (, UWB),
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