使用色散補償拉曼/摻鉺光纖混合式放大器整合無色光源技術應用於長距離分波多工被動式光網路傳輸系統之研究

本篇論文中，提出使用高速雙向長距離傳輸且上下行傳輸速率分別具有10 Gb/s及5 Gb/s傳輸速率的分波多工被動式光網路 (Wavelength division multiplexing Passive Optical Network；WDM-PON) 系統。本系統上、下行分別各為2個通道，其通道間距為1.6 nm (200 GHz)，使用以色散補償光纖(Dispersion Compensating Fiber；DCF) 為主的拉曼放大器 (Raman Amplifier；RA) 及摻鉺光纖放大器 (Erbium-Doped Fiber Amplifier；EDFA) 建置於本地交換處 (Local Exchange；LE) 。此色散補償拉曼/摻鉺光纖混合式放大器 (Dispersion compensating Raman/EDFA hybrid amplifier；DCRA/EDFA) 於雙向光纖鏈路中可提供光功率放大且同時解決色度色散 (Chromatic dispersion) 及自發放大輻射 (Amplified Spontaneous Emission；ASE) 等長距離傳輸中主要面臨之問題。整合無色光源技術主要是利用下行光源，經由反射式光網路單元 (Reflective Optical Network Unit ; R-ONU) 的電吸收調變器 (Electro-Absorption Modulator) 作為無色技術之核心，將下行訊號再調製 (Re-modulation) 利用作為上行傳輸鏈路之使用。本篇論文驗證了使用色散補償拉曼/摻鉺光纖混合式放大器來補償因長距離傳輸所造成的色散和損失，使得總傳輸距離能夠延伸至120 km以上，減少使用光放大器的數量。接著分別以歸零差動相位偏移鍵制 (RZ-DPSK) 作為下行傳輸格式以及歸零開關鍵制 (RZ-OOK) 作為上行傳輸格式，並比較在不同泵激方向之混合式放大器架構下的傳輸效能。在經過120km光纖傳輸後，於上、下行之用戶接收端在誤碼率為10-9時之Power penalty小於1dB。顯示出使用前向形式混合式放大器並整合無色光源技術適合用於應用在長距離傳輸的分波多工被動光網路系統，不僅可以有效的降低成本的使用，而且也改善了訊號的品質，故能得到良好的傳輸效果。

關鍵字

拉曼放大器；摻鉺光纖放大器；混合式放大器；無色光源；電吸收調變器；分波多工被動光網路

並列摘要

In this thesis, a bi-directional long-reach wavelength division multiplexing Passive Optical Network (WDM-PON), with 10 Gb/s bit rate in downlink and 5 Gb/s bit rate in uplink, are proposed. There are two channels with 0.4 nm channel spacing in downstream and upstream, respectively. The dispersion-compensating Raman amplifier /EDFA hybrid amplifier (DCRA/EDFA) which based on dispersion compensating fiber (DCF) is built in the local exchange. The DCRA/EDFA hybrid amplifier not only boost up the power budget, but also reduce the noise in long-reach transmission, including the chromatic dispersion and the effect of amplified spontaneous emission (ASE). Colorless operation is implemented by an electro-absorption modulator (EAM) to re-modulate the downstream signal in each reflective optical network units (R-ONUs) for uplink signals. In this thesis, the hybrid DCRA/EDFA amplifier is verified to improve the fiber dispersion and reduce the loss through the long reach transmission. Due to this scheme, the fiber link can be extended to 120 km transmission and reduced the number of optical amplifiers. The comparison of different pumping type between the feed-forward and backward pumping in RZ-DPSK downlink signal and RZ-OOK uplink signal are presented. And the power penalty are less than 1dB in at 10-9 bit-error-rate in bi-directional fiber link . The results showed that the feed-forward pumping in hybrid amplifier integrated with colorless technique in long-reach WDM-PON transport system not only can reduce capital expenditures, but also can improve the signal performance. Furthermore, it will provide the better sensitivity in transmission.

並列關鍵字

Raman amplifier ； EDFA ； Hybrid amplifier ； Colorless ； Electro-Absorption Modulator (EAM) ； Wavelength Division Multiplexing- Passive Optical Network (WDM-PON)

參考文獻

[5] J. C. Bouteiller and L. Leng, "Pump-pump four-wave mixing in distributed Raman amplified systems," Journal of Lightwave Technology, vol. 22, pp. 723-732, 2004.

[6] D. McGhan, C. Laperle, A. Savchenko, C. Li, G. Mak, and M. O’Sullivan: 5120 km RZ-DPSK transmission over G.652 fiber at 10-Gb/s with no optical dispersion compensation, in Proc. OFC 2005, Anaheim, CA, paper PDP27, 2005.

[8] A. Banerjee, “Wavelength-division-multiplexed passive optical network (WDM-PON) technologies for broadband access: a review,” Journal of Optical Networking, vol. 4, no. 11, Nov. 2005, pp. 737-758.

[9] S. M. Lee, K. M. Choi, S. G. Mun, J. H. Moon, and C. H. Lee, “Dense WDM-PON Based on Wavelength-Locked Fabry–Pérot Laser Diodes,” IEEE Photonics Technology Letters, vol. 17, no. 7, pp. 1579-1580, Jul. 2005.

[10] W. Lee, M. Y. Park, S. H. Cho, J. Lee, C. Kim, G. Jeong, and B. W. Kim, “Bidirectional WDM-PON based on gain-saturated reflective semiconductor optical amplifiers,” IEEE Photonics Technology Letters, vol. 17, no. 11, pp. 2460-2462, Nov. 2005.

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使用色散補償拉曼/摻鉺光纖混合式放大器整合無色光源技術應用於長距離分波多工被動式光網路傳輸系統之研究

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