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【期刊论文】Sampled phase-shift Fiber Bragg Gratings
余重秀, Wang xu Yu chong-xiu Yu zhi-hui Shang xin-zhu
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-1年11月30日
A phase-shift fiber Bragg grating with sampling is proposed to generate a multi-channel bandpass filter in the background of multi-channel stopbands. The sampled Moir
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【期刊论文】Research of Broadband and Gain-flatted Raman Fiber Amplifier
余重秀, Yu Chongxiu Li Anjian Xin Xiangjun Zhang Zhiguo Liu Xiaoyi
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-1年11月30日
Broadband and gain-flatted Raman fiber amplifier (RFA) is one of the key devices of dense-wavelength-division-multiplexing systems. Its amplification mechanism, pump schemes and the characteristics etc are introduced in the paper. The methods of realizing the broadband and gain flatted RFA mare analyzed. We made the theoretical and experimental investigation for RFA. Our researching results showed the RFA has the outstanding features for DWDM transmission system and are the good reference to design and use of RFA.
Raman fiber amplifier Raman gain gain-flatted bandwidth
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【期刊论文】Research of A New DS/WH En-/De-coding Scheme for Optical CDMA
余重秀, Yu Chongxiu*a, Yang Qifang b, Qin Wenbiao a
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-1年11月30日
In this paper the direct spreading/wavelength hopping (DS/WH) eo-/de-coding scheme for optical code-division multiple access (OCDMA) is proposed. The system structure is designed and analyzed. A new code sequence-wavelength hopping extended quadratic congruence for prime code (WH EQC/prime code)-is adopted. It is shown that the code capability can be increased by increasing the number of discrete wavelengths or by employing asymmetric systems with different prime numbers for spreading and hopping (Ps and Ph). The Synchronous signal is designed and analyzed It is very easy for user to decode synchronously. The performance of the system is investigated and it is shown that the en-/de-coding scheme and system structurn are feasible.
Optical CDMA,, DS/, WH,, En-/, De-coding,, WH EQC/, Prime Code,, Multi-rate Data Stream,, Synchronous Decoding
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余重秀, 辛雨, 吴强, 张琦, 刘德国, 陈卓
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-1年11月30日
在二次方一致性的基础上,构造了一种容量大、自相关和互相关特性好的码族。研究表明,采用这个码族的光码分多址(Optical CDMA)系统比波分复用(WDM)系统拥有大得多的用户数。而且这个码族很适合于异步和多比特率接入的光码分多址系统。 据我们了解,这种码字用于在光码分多址非相干频域编制中为首次被提出。
光码分多址, 频谱领域, 非相干源, 二次方一致性
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余重秀, Qiang Wu, , Chongxiu Yu, Kuiru Wang, Xu Wang, Zhihui Yu, H.P. Chan, Pak L. Chu
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-1年11月30日
The design of a multi-channel fibre Bragg grating to compensate simultaneously the fibre dispersion and dispersion slope is proposed and analyzed. It is found that constituent gratings with equal length would result in unequal channel bandwidth and large band edge side lobes in broad bandwidth channels due to large dispersion slope. To overcome these short-comings, we propose a new design procedure in that both the physical length and apodization function of the constituent gratings be allowed to vary. This results in a multi-channel grating with equal bandwidth and negligible band edge side lobes. Of course this grating compensates both the fibre dispersion and dispersion slope very well.
multi-channel,, fiber Bragg gratings,, dispersion,, dispersion slope.,
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