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陈宏伟, Hongwei Chen, Minghua Chen, Ciyuan Qiu, and Shizhong Xie
OPTICS LETTERS / Vol. 32, No. 9 / May 1, 2007,-0001,():
-1年11月30日
A novel polarization shift keying label rewriting scheme in 43 Gbit/s all-optical label switching network by synchronous polarization modulation is proposed and experimentally demonstrated. The old label can be changed to a new one by just one single step without a label erasure process, which can simplify the network node structure.
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【期刊论文】PolSK Label Over VSB-CSRZ Payload Scheme in AOLS Network
陈宏伟, Hongwei Chen, Minghua Chen, , and Shizhong Xie
JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 25, NO. 6, JUNE 2007,-0001,():
-1年11月30日
A novel orthogonal modulation scheme of polarization-shift-keying label over vestigial sideband payload is proposed and experimentally demonstrated over a 43-Gb/s alloptical- label-switching transmission. With this scheme, a high extinction ratio of the label is reached, while a spectral efficiency of 0.8 b/s/Hz is achieved by weakening the imperfection of the high-speed pulse sequence in polarization modulation. Furthermore, this modulation scheme is relatively irrelevant with payload bit rate. The payload and label penalties after 80-km NZDSF fiber transmission and label erasure are 1.5 and 1 dB, respectively. The influence of filter center frequency offset is also investigated. Besides, a label rewriting method is introduced to simplify label processing in intermedia nodes. All these results show that this scheme can be a candidate technique for the next-generation optical network.
All-optical label switching (, AOLS), , label rewriting, polarization shift keying (, PolSK), , vestigial sideband (, VSB), -carrier suppressed return-to-zero (, CSRZ),
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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】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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【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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