光纖有線電視/光纖微波傳輸系統

CATV/Radio-over-Fiber Transport Systems

林文義(Wen-Yi Lin)

指導教授 ： 呂海涵

國立臺北科技大學/電資學院/光電工程系研究所/博士(2010年)

摘要

本論文的主旨在研究光纖有線電視 (cable television) 與光纖微波 (radio-over-fiber, ROF) 傳輸系統之應用。在光纖有線電視的研究部分，主要在於探討利用分頻、分波多工及光放大器串接技術所架構之長距離直調式光纖有線電視系統，並利用光源注入鎖模 (injection-locked)、遠端光源注入、及光單一旁波帶 (single sideband, SSB) 之技術來降低整體傳輸系統之成本，其性能亦能媲美傳統之外調式光纖有線電視系統。在光纖微波傳輸系統的應用研究部分，主要研究內容為整合光纖有線電視及微波信號，亦利用極化調變技術、光電子迴授技術 (optoelectronic feedback) 及三階互調失真抑制 (third-order intermodulation distortion suppression) 等機制，來提升系統傳輸性能，成功將不同的有線及無線訊號同時載入到光纖網路中，除了提高光纖使用效率亦能整合成智慧型傳輸系統 (intelligence transport system, ITS)。上述之研究已成功提升光纖有線電視傳輸系統的載波雜訊比 (carrier-to-noise ratio, CNR)、二次合成拍差比 (composite second order, CSO) 及三次合成拍差比 (composite triple beat, CTB)，亦有效的改善數位有線電視傳輸系統之傳輸誤碼率 (bit error rate, BER)。此外，混合式光纖有線電視/光纖微波傳輸系統能夠降低三階互調失真載波比值 (third order intermodulation distortion to carrier ratio, IMD3/C) 及傳輸誤碼率亦可以得到良好的效益。從理論上的推演及架構已詳盡的分析與實驗驗證，在技術層次上更為簡易、且在經濟效應上更具競爭優勢，上述成果預期將有助於光纖有線電視與光纖微波傳輸系統的發展。

關鍵字

光纖微波 ； 外部光源注入 ； 遠端光源注入 ； 光單旁波帶調變

並列摘要

In this dissertation, we investigate and present optical-fiber CATV transport systems and radio-over-fiber (ROF) transport systems. For the CATV systems, the research is concentrating on the applications of split-band and wavelength-division multiplexing (WDM) techniques in long-haul CATV transport system. In addition, the optical injection-locked, remote injection-locked and optical single sideband schemes are employed to improve the performance of transport system. Comparing with external modulation architectures, our directly modulating CATV transport systems are much more economic. For the CATV/ROF systems, the research is focusing on the transmission efficiency improvement by utilizing polarization modulation, optoelectronic feedback techniques and third-order intermodulation distortion suppression schemes. We not only integrate wired and wireless signals simultaneously to raise the fiber utilization efficiency but also combine them to achieve an intelligent transport system. Excellent performance of carrier-to-noise (CNR), composite second-order (CSO), and composite triple beat (CTB) are achieved for various CATV transport systems as well as low bit error rate (BER) values and third order intermodulation distortion to carrier ratio (IMD3/C) are demonstrated for hybrid CATV/ROF transport systems. Since these proposed architectures are simpler and more cost-effective than conventional structures, they are useful in the fields of optical fiber CATV communication systems and ROF transport systems.

並列關鍵字

external light injection ； optical single sideband modulation ； radio-over-fiber ； remote light injection

參考文獻

[3] J. C. Palais, “Fiber optic communications,” Fifth Edition, Prentice Hall, pp. 25-27, 2005.

[5] A. A. Elfeitori and V. C. M. Leung, “Rersonal communications services over HFC CATV networks,” Conf. Electr. Comput. (CCECC'09), vol. 2, pp. 462-465, 1997.

[6] P. C. Won, and J. A. R.Williams, “Third-order intermodulation products generated on transmission through nonlinear radio-on-fibre link,” Electron. Lett., vol. 40, pp. 1290-1291, 2004.

[7] M. G. Larrode, A. M. Koonen, J. J. V. Olmos, and A. Ng’Oma, “Bidirectional radio-over-fiber link employing optical frequency multiplication,” IEEE Photon. Technol. Lett., vol. 18, pp. 241-243, 2006.

[8] Q. Liu, C. Qiao, G. Mitchell and S. Stanton, “Optical wireless communication networks for first and last-mile broadband access,” J. Opt. Netw., vol. 4, pp. 807-828, 2005.