利用不同調變格式搭配頻譜轉換技術應用於高密度分波多工系統之長距離傳輸的研究與設計

Study and Design of the Advanced Modulation Formats on Employing Spectral Inversion Technique for Long-Haul Transmission in DWDM System.

蘇琮益(Coung-Yi Su)

指導教授 ： 賴柏洲

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00061

摘要

本論文是利用摻鉺光纖放大器(Erbium Doped Fiber Amplifier；EDFA)搭配兩種不同的傳輸光纖以及色散補償光纖(Dispersion Compensation Fiber；DCF)組合不同的光路配置，去測試非歸零開關鍵制(Nonreturn to Zero-On Off Keying；NRZ-OOK)、歸零開關鍵制(Return to Zero-On Off Keying；RZ-OOK)、載波抑制歸零開關鍵制(Carrier Suppressed Return to Zero-On Off Keying；CSRZ-OOK)、非歸零差動相位偏移鍵制(Nonreturn to Zero-Differential Phase Shift Keying；NRZ-DPSK)、歸零差動相位偏移鍵制 (Return to Zero-Differential Phase Shift Keying；RZ-DPSK)、載波抑制歸零差動相位偏移鍵制(Carrier Suppressed Return to Zero-Differential Phase Shift Keying；CSRZ-DPSK)等六種調變格式於10-Gbit/s傳輸速度之下，應用在長距離高密度分波多工(Dense Wavelength Division Multiplexing；DWDM)系統傳輸之效益。此外，並由實驗得到，在接收端之前使用頻譜轉換(Spectral Inversion；SI)元件，對於非線性相位雜訊(non-linear phase noise)做補償，可以提升DWDM系統之OSNR值，較傳統利用色散補償光纖傳輸系統提升了57％的傳輸距離，可達到長距離傳輸之目地。
本論文模擬實驗，旨在探討在不同調變格式之下，色散以及非線性效應對於傳輸距離和品質的影響。模擬環境為32-ch×10-Gb/s長距離高密度分波多工系統，實驗中並使用兩個EDFA作為線上放大器去補償一個區段光纖損失的傳輸系統；CSRZ-DPSK調變是DWDM中最好的選擇，損耗也相對較小，期望此結果能為高速大容量長距離的光纖系統中帶來更多希望。

關鍵字

摻鉺光纖放大器 ； 長距離高密度分波多工 ； 頻譜轉換

並列摘要

In this thesis, it will discuss about various optical fiber communication configurations utilizing Erbium Doped Fiber Amplifier (EDFA) in combination with two optical fibers and Dispersion Compensation Fiber (DCF). Furthermore, the efficiencies of six different modulation formats applied in the Dense Wavelength Division Multiplexing (DWDM) will be evaluated under the 10-Gbit/s transmission system environment. The six modulation formats include Non-Return-to Zero On-Off Keying (NRZ-OOK), Return-to-Zero On-Off Keying (RZ-OOK), Carrier- Suppressed-Return-to-Zero On-Off Keying (CSRZ-OOK), Non-Return-to Zero Differential Phase Shift keying (NRZ-DPSK), Return-to-Zero Differential Phase Shift Keying (RZ-DPSK) and Carrier-Suppressed Return-to-Zero Differential Phase Shift Keying (CSRZ-DPSK). In addition, if Spectral Inversion (SI) component is used on the receiving end to reduce the non-linear phase noise effect, the transmission distance is improved by 57% when being compared with the conventional transmission system using DCF for chromatic dispersion compensation. 　
In the simulation conducted in this thesis, we tried to explore the impacts of different modulation formats, optical fibers, dispersions and non-linear effects on transmission distance and quality. We utilized the 32-ch × 10-Gbit/s long-distance DWDM system and used two EDFA as in-line amplifier to compensate for the span loss in the proposed system. The simulation result revealed that the CSRZ-DPSK delivered the best performed in the high-capacity DWDM system environment, which might offer a promising alternative for data transmission in a high-speed and long-distance fiber optical system environment.

並列關鍵字

EDFA ； DWDM ； Spectral Inversion

參考文獻

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