全雙工光纖/微波系統

Full-Duplex Radio-on-Fiber Transport system

徐銘輝(Ming-Huei Shiu)

指導教授 ： 曾世杰

國立臺北科技大學/電資學院/光電工程系研究所/碩士(2008年)

摘要

光纖/微波系統結合了光纖傳輸低損耗、高頻寬、抗干擾等優點，與無線傳輸不受限於特定位置的特性，實現了以較低的成本而達成高速且高容量的無線網路傳輸。
在第一個架構中，採用垂直共振腔面射型雷射並利用注入鎖模及光電子迴授技術大幅提高頻率響應，建構出一個Radio-on-MMF 的傳輸系統。由於注入鎖模和光電子迴授大量提升雷射本身的頻率響應使得驅動電流降低，進而促使系統性能獲得整體改善。因此在實驗參數中，我們可以到良好的誤碼率、誤差向量振幅及互調失真載波比。
　　第二個架構，我們提出並驗證一具有良好誤碼率及清晰眼圖的全雙工光纖/微波傳輸系統。架構中的發射端使用FP雷射作為光源，而光源經載入訊號後，使用光帶通濾波器選取所需的兩個波長，再經光纖傳輸至接收端。在接收端則利用光循環器及光纖布拉格光柵將其中一波長反射，並利用再調變技術以實現雙向全雙功之功能。我們提出的系統架構僅使用一個FP雷射作為上、下行傳輸的光源，因此建構成本及系統複雜度皆得以降低。

關鍵字

光纖/微波 ； 注入鎖模 ； 光電子迴授技術 ； 全雙功 ； FP雷射

並列摘要

Radio-on-Fiber (ROF), the integration of broadband wireless communication and optical system, is a promising technology to realize high speed access network with increasing the capacity as well as decreasing the cost.
　　In the first architecture, we propose a radio-on-multimode fiber (MMF) system based on vertical-cavity surface-emitting lasers (VCSELs) injection-locked and optoelectronic feedback techniques is proposed and demonstrated. The injection-locking and optoelectronic feedback achieves large frequency response of VCESL, in which resulting in good performances of intermodulation distortion to carrier ratio (IMD/C), error vector magnitude (EVM), and bit-error rate (BER). Using VCSELs as optical sources in radio-on-MMF systems are very attractive, as they are relatively simple to fabricate and potentially low-cost. Such a proposed radio-on-MMF system is suitable for the short-haul microwave optical link.
　　In the second architecture, A full-duplex radio-on-fiber (ROF) transport system based on an Fabry-Perot laser diode (FP-LD) with an optical band-pass filter (OBPF) at the CS, as well as employed an optical circulator (OC) with a fiber Bragg grating (FBG) at the BS, is proposed and demonstrated. Good transmission performances estimated by bit-error rate (BER) and eye diagram are obtained in our proposed systems. Since our proposed systems use only an FP-LD as light source for both down-link and up-link transmissions, it reveals a prominent alternative with advantages in simplicity and cost.

並列關鍵字

Radio-on-fiber ； injection-locked ； optoelectronic feedback techniques ； full-duplex ； Fabry-Perot laser diode (FP-LD)

參考文獻

[1] 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, September 2004.

[2] 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, January 2006.

[3] Y. Okamoto, R. Miyamoto, and M. Yasunaga, “Radio-on-fiber access network systems for road-vehicle communication,” in IEEE Intelligent Transportation Systems Conf. Proc., pp. 1050-1055, August 2001.

[4] H. H. Lu, W. S. Tsai, T. S. Chien, S. H. Chen, B. S. Cheng, and C. C. Chen, “A bidirectional radio-on DWDM transport system for LAN and ITS applications,” IEEE Photon.Technol. Lett., vol. 18, pp. 127-129, January 2006.

[5] W. S. Tsai, H. H. Lu, C. P. Chuang, and C, C. Tsai, “Radio-on-DWDM transport systems for PHS/VICS/ETC/SB applications,” in APOC’2006, 6353-101, October 2006.