应用于电光RAM的全光串并转换技术研究
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摘要
从高速信号传输的发展来看,光分组交换是光交换的发展方向。但就目前的技术而言,还远远不能够解决高速率的光分组数据的存储和协议处理的问题。而高速率的串并转换技术可将高速率的信号变成低速率的信号,从而解决分组交换的随机存储和协议处理的问题。本文实现了一种新型的40Gbps全光串并转换装置,主要完成的工作包括:
一、从理论上分析了主动锁模激光器产生窄脉冲的机理。
二、对窄脉冲通过高非线性光纤进行谱展宽进行了研究。
三、对应用不同特性滤波器进行谱切片产生波时分脉冲的质量优劣进行了理论、仿真和实验研究。
四、对通过OTDM和色散走离方式产生波时分源进行了研究。
五、在波时分源的基础上,提出了基于SOA中XPM效应的多波长变换技术的高速率全光串并转换方案,完成了40Gbps至10Gbps×4及5Gbps×8全光串并转换实验样机,变换后的并行信号的信噪比对应变换前的恶化串行信号有十几dB的提高。
该全光串并转换系统为下一步的光分组交换中的报头处理技术和光RAM的研究打下良好的基础。为光分组交换的最终实现打下良好的技术基础。同时,高速率的串并转换技术在其它的高速率信号的处理领域上也有很好的应用前景。
Although optical packet switching has be considered as a promising solution for future large-capacity optical networks, the realization of optical packet switching has encountered severe technical challenges as the high-speed optical signal processing capabilities (label processing, randomly access memory and swapping) are required at optical network nodes. High bit-rate all optical serial-to-parallel conversion (AOSPC) would be very attractive as can be used to match high-speed input optical packets with low-speed processing ability. Here, a 40Gbps all optical serial-to-parallel conversion system has been realized due to the main work as following:
1. Analyse the machanism of short pluse generation based on active mode-locked laser(AMLL).
2. The Spectral broadening of short plus in the high nonlinear fiber(HNLF) is studied .
3. The quality of Spectral slicing ,using various kinds of Band-pass filters which have the different spectral characteristics through the method of theory, simulation and experiment, is analysed.
4. A time-and wavelength-interleaved pulse source ,which is implemented by OTDM and Dispersion walk-off, is studied.
5. A scheme of AOSPC is proposed,with using the multi-wavelength conversion technology based on the cross-phase modulation(XPM) in a SOA.In the experiment, we convert 40-Gbps serial optical signals into 4-channel 10-Gbps parallel optical signals and 8-channel 5Gbps parallel optical signals respectively with the OSNR enhancement of more than 10 dB.
It should be pointed out that, this technique can be a solid preparation for the researching of optical label processing and RAM technique to the realization of optical packet switching. Furthermore, there are also very prospective applications of high bit-rate all optical serial-to-parallel conversion in other high bit-rate signal processing areal.
一、从理论上分析了主动锁模激光器产生窄脉冲的机理。
二、对窄脉冲通过高非线性光纤进行谱展宽进行了研究。
三、对应用不同特性滤波器进行谱切片产生波时分脉冲的质量优劣进行了理论、仿真和实验研究。
四、对通过OTDM和色散走离方式产生波时分源进行了研究。
五、在波时分源的基础上,提出了基于SOA中XPM效应的多波长变换技术的高速率全光串并转换方案,完成了40Gbps至10Gbps×4及5Gbps×8全光串并转换实验样机,变换后的并行信号的信噪比对应变换前的恶化串行信号有十几dB的提高。
该全光串并转换系统为下一步的光分组交换中的报头处理技术和光RAM的研究打下良好的基础。为光分组交换的最终实现打下良好的技术基础。同时,高速率的串并转换技术在其它的高速率信号的处理领域上也有很好的应用前景。
Although optical packet switching has be considered as a promising solution for future large-capacity optical networks, the realization of optical packet switching has encountered severe technical challenges as the high-speed optical signal processing capabilities (label processing, randomly access memory and swapping) are required at optical network nodes. High bit-rate all optical serial-to-parallel conversion (AOSPC) would be very attractive as can be used to match high-speed input optical packets with low-speed processing ability. Here, a 40Gbps all optical serial-to-parallel conversion system has been realized due to the main work as following:
1. Analyse the machanism of short pluse generation based on active mode-locked laser(AMLL).
2. The Spectral broadening of short plus in the high nonlinear fiber(HNLF) is studied .
3. The quality of Spectral slicing ,using various kinds of Band-pass filters which have the different spectral characteristics through the method of theory, simulation and experiment, is analysed.
4. A time-and wavelength-interleaved pulse source ,which is implemented by OTDM and Dispersion walk-off, is studied.
5. A scheme of AOSPC is proposed,with using the multi-wavelength conversion technology based on the cross-phase modulation(XPM) in a SOA.In the experiment, we convert 40-Gbps serial optical signals into 4-channel 10-Gbps parallel optical signals and 8-channel 5Gbps parallel optical signals respectively with the OSNR enhancement of more than 10 dB.
It should be pointed out that, this technique can be a solid preparation for the researching of optical label processing and RAM technique to the realization of optical packet switching. Furthermore, there are also very prospective applications of high bit-rate all optical serial-to-parallel conversion in other high bit-rate signal processing areal.
引文
[1] http://www.businessweek.com/ap/financialnews/D8NM9BDG0.htm
[2] http://telecom.chinabyte.com/26/2224026.shtml
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[5] Zhuoran Wang; Nan Chi; Siyuan Yu;“Time-slot assignment using optical buffer with a large variable delay range based on AVC crosspoint switch”Journal of Lightwave Technology, Volume 24, Issue 8, Aug.2006 Page(s):2994– 3001
[6] Nan Chi; Zhuoran Wang; Siyuan Yu;“A large variable delay, fast reconfigurable optical buffer based on multi-loop configuration and an optical crosspoint switch matrix”Optical Fiber Communication Conference,2006 and the 2006 National Fiber Optic Engineers Conference 5-10 March 2006 Page(s):3 pp.
[7] Chi, N.; Vegas Olmos, J.J.; Thakulsukanant, K.; Wang, Z.; Ansell, O.; Yu, S.; Huang, D.;“Experimental Characteristics of Optical Crosspoint Switch Matrix and Its Applications in Optical Packet Switching”,Lightwave Technology, Journal of Volume 24, Issue 10, Oct. 2006 Page(s):3646– 3653
[8] Nan Chi; Dexiu Huang; Zhuoran Wang; Siyuan Yu;“Optical Buffering and Time Slot Interchanging Based on an Optical Crosspoint Switch Matrix”Optoelectronics, 2006 Optics Valley of China InternationalSymposium on, Nov. 2006 Page(s):31– 32
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[16] D. Dahan, G. Eisenstein,“Tunable all optical delay via slow and fast light propagation in a Raman assisted fiber optical parametric amplifier: a route to all optical buffering,”Optics Express, vol. 13 pp6234-6250, 2005.
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[19] Hitoshi Kawaguchi,“All-Optical Signal Regeneration and Optical Buffering Using Polarization Bistable VCSELs”, ICTON 2006, pp24-27, 2006
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[2] http://telecom.chinabyte.com/26/2224026.shtml
[3] Burmeister, E.F.; Bowers, J.E.“Integrated gate matrix switch for optical packet buffering;”Photonics Technology Letters, IEEE, Volume 18, Issue 1, Jan. 1, 2006 Page(s):103– 105
[4] Zhang, T.; Lu, K.; Jue, J.R.;“Shared fiber delay line buffers in asynchronous optical packet switches”,Journal on Selected Areas in Communications, IEEE, Volume 24, Issue 4, Part Supplement, Apr 2006 Page(s):118 - 127
[5] Zhuoran Wang; Nan Chi; Siyuan Yu;“Time-slot assignment using optical buffer with a large variable delay range based on AVC crosspoint switch”Journal of Lightwave Technology, Volume 24, Issue 8, Aug.2006 Page(s):2994– 3001
[6] Nan Chi; Zhuoran Wang; Siyuan Yu;“A large variable delay, fast reconfigurable optical buffer based on multi-loop configuration and an optical crosspoint switch matrix”Optical Fiber Communication Conference,2006 and the 2006 National Fiber Optic Engineers Conference 5-10 March 2006 Page(s):3 pp.
[7] Chi, N.; Vegas Olmos, J.J.; Thakulsukanant, K.; Wang, Z.; Ansell, O.; Yu, S.; Huang, D.;“Experimental Characteristics of Optical Crosspoint Switch Matrix and Its Applications in Optical Packet Switching”,Lightwave Technology, Journal of Volume 24, Issue 10, Oct. 2006 Page(s):3646– 3653
[8] Nan Chi; Dexiu Huang; Zhuoran Wang; Siyuan Yu;“Optical Buffering and Time Slot Interchanging Based on an Optical Crosspoint Switch Matrix”Optoelectronics, 2006 Optics Valley of China InternationalSymposium on, Nov. 2006 Page(s):31– 32
[9] C. Liu, Z. Dutton, C. Behroozi, and L. V. Hau,“Observation of coherent optical information storage in an atomic medium using halted light pulses,”Nature, vol. 409, no. 6819, pp. 490–493, Jan. 25, 2001.
[10] L. V. Hau, S. E. Harris, Z. Dutton, and C. H. Behroozi,“Light speed reduction to 17 meters per second in an ultracold atomic gas,”Nature, vol. 397, no. 6720, pp. 594–598, Feb. 18, 1999.
[11] A. Turukhin, V. S. Sudarshanam, M. S. Shahriar, J. A. Musser, and P. R. Hemmer,“First observation of ultraslow group velocity of light in a solid,”in Tech. Digest., Quantum Electronics Laser Science Conf.(QELS),Baltimore, MD, May 6–11, 2001, pp. 6–7.
[12] P. C. Ku, F. Sedgwich, C. Chang-Hasnain, P. Palinginis, T. Li, H. Wang, S. W. Chang, and S. L. Chuang,“Slow light in semiconductor quantum wells,”Opt. Lett., vol. 29, no. 19, pp. 2291–2293, 2004.
[13] K. Y. Song, H. G. Herraez, and L. Thevenaz,“Observation of pulse delaying and advancement in optical fibers using stimulated Brillouin scattering,”Optics Express, vol.13, pp.82-88, 2005.
[14] Yoshitomo Okawachi, Matthew S. Bigelow, Jay E. Sharping, Zhaoming Zhu, Aaron Schweinsberg,Daniel J. Gauthier, Robert W. Boyd, and Alexander L. Gaeta,“Tunable all-optical delays via Brillouin slow light in an optical fiber”, Phys. Rev. Lett. Vol94, pp 1-4, 2005
[15] J. E. Sharping, Y.Okawachi, A. L. Gatea,“Wide bandwidth slow light using a Raman fiber amplifier,”Optics Express, vol.13, pp.6092-6098, 2005.
[16] D. Dahan, G. Eisenstein,“Tunable all optical delay via slow and fast light propagation in a Raman assisted fiber optical parametric amplifier: a route to all optical buffering,”Optics Express, vol. 13 pp6234-6250, 2005.
[17] T. Nakahara, H. Takenouchi, R. Takahashi, K. Takahata, and H. Suzuki,“32-bit label swapping of 40-Gbit/s burst optical packets with intensity tracking of input label,”European Conference on Optical Communications (ECOC2004), (IEEE, New York, 2004), Vol. 4, pp. 938–939.
[18] Takashi Mori1, Yuuki Sato1 and Hitoshi Kawaguchi,“2-bit optical buffering using polarization bistable VCSELs”, Lasers & Electro-Optics Society, IEEE Oct. 2006 Page(s):510 - 511
[19] Hitoshi Kawaguchi,“All-Optical Signal Regeneration and Optical Buffering Using Polarization Bistable VCSELs”, ICTON 2006, pp24-27, 2006
[20] A.S. Liao, S. Wang,“Semiconductor injection lasers with a circular resonator”, Appl. Phys. Lett., vol. 36,pp. 801-803, 1980.
[21] S. Oku, M. Okayasu, and M. Ikeda,“Low-threshold operation of square-shaped semiconductor ring lasers (orbiter lasers)”, IEEE Photon. Technol. Lett., vol. 3, pp. 588-590, 1991.
[22] C. Ji, M. H. Leary, and J. M. Ballantyne,“Long-wavelength triangular ring laser”, IEEE Photon. Technol.Lett., vol. 9, pp. 1469-1471, 1997.
[23] P.J.R. Laybourn, M. Sorel, G. Giuliani, S. Donati,“Integrated semiconductor laser rotation sensor”, Proc.SPIE 3620, pp. 322-331, 1999
[24]Born, C.; Sorel, M.; Siyuan Yu;“Linear and nonlinear mode interactions in a semiconductor ring laser”,Quantum Electronics, IEEE Journal of Volume 41, Issue 3, March 2005 Page(s):261-271
[25]Born, C.J.; Hill, M.; Yu, S.; Sorel, M.;“Lasing direction hysteresis in a semiconductor ring laser”,Quantum Electronics and Laser Science, 2005 Conference Volume 2, 22-27 May 2005 Page(s):1035– 1037
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