運用多波長產生器搭配上行載波抑制歸零差動相位偏移調變應用於被動式光網路之研究與設計

本篇論文中，提出雙向長距離傳輸系統之分波多工被動式光網路(Wavelength Division Multiplexing Passive Optical Network；WDM-PON)，架構中下行部分將多波長產生器(Multi-Wave-length Generator；MWG)運用在光纖終端 (Optical Line Terminal；OLT)，用兩個分佈式回授雷射二極體(Distributed Feedback-Laser Diode；DFB-LD)為發射端，產生出16個載波做為傳輸通道做雙向傳輸，下行傳輸速率為10 Gbit/s；並在光網路單元(Optical Network Unit；ONU)端使用載波抑制歸零差動相位偏移鍵控(Carrier Suppressed Return-to-Zero On-Off Keying；CSRZ-OOK)調變將下行訊號再調變，做頻譜位移不僅可以避免雷利散射(Rayleigh scattering)，也可以將被動式光網路的總傳輸距離提升到140km以上，上行傳輸速率為5 Gbit/s。論文中提出四種不同下行調變碼之架構，分別比較各種下行調變碼搭配上行CSRZ-OOK調變碼之傳輸效能，驗證使用MWG產生多載波並搭配CSRZ-OOK調變，將下行光源再調變用於上行傳輸，而上下行使用不同波長可有效避免雷利散及有效利用頻寬，並可以提升傳輸距離，達到建構長距離被動式光網路系統。

關鍵字

分波多工被動式光網路；多波長產生器；載波抑制歸零差動相位偏移調變；雷利散射

並列摘要

In this thesis, we propose a bidirectional long-reach Wavelength Division Multiplexing Passive Optical Network(WDM-PON). In the downstream of structure uses two Distributed Feedback-Laser Diodes (DFB-LD) as transmitter connected with Multi-Wavelength Generator (MWG) which can utilize two DFB-LD to generate 16 carriers as downstream channels with 10-Gbit/s bit rate at the Optical Line Terminal (OLT). In addition, we utilize CSRZ-OOK modulation to re-modulate the downstream signals into upstream signals with 5-Gbit/s bit rate to produce spectrum displacement in each Reflective Optical Network Unit (R-ONU) in order to avoid Rayleigh scattering effect. We propose the comparisons of four different modulations in downstream transmission with CSRZ-OOK modulation in upstream transmission. Expriments verify that we use the MWG to generate multi-carrier with CSRZ-OOK modulation as the upstream channels. Hence, the results showed that it not only aviods Rayleigh scattering effect to bidirectional WDM-PON, but also raises the transmission distance of Passive Optical Network(PON) to 140 km and achieving the Long-Reach PON.

並列關鍵字

WDM-PON ； MWG ； CSRZ-OOK ； Rayleigh scattering

參考文獻

[2] D. K. Hunter, P. J. Legg, and I. Andonovic, “Architecture for large for large dilated optical TDM switching network,” IEE PROCEEDINGS-J, vol. 140, no. 5, Oct. 1993.

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[4] W. Li, M. Chen, Y. Dong, and S. Xie, “All-Optical Format Conversion From NRZ to CSRZ and Between RZ and CSRZ Using SOA-Based Fiber Loop Mirror,”IEEE Photonics Technology Letters, vol. 16, no. 1, pp. 203-205, Jan. 2004.

[5] M. Daikoku, N. Yoshikane, and I. Morita, “Performance comparison of modulation formats for 40 Gbit/s DWDM transmission systems,” in Proc. Optical Fiber Communication Conf.(OFC2005), vol. 5, Mar. 2005, pp. 3-5.

[6] C. W. Chow, “Wavelength Remodulation Using DPSK Down-and-Upstream With High Extinction Ratio for 10-Gb/s DWDM-Passive Optical Networks,” IEEE Photonics Technology Letters, vol. 20, no. 1, pp. 12-14, Jan. 2008.

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運用多波長產生器搭配上行載波抑制歸零差動相位偏移調變應用於被動式光網路之研究與設計

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