超寬頻60 GHz光載微波無線系統

Ultra Broadband 60 GHz Radio-over-Fiber System

黃厚茨(Hou-Tzu Huang) ； 江雅棠(Ya-Tang Chiang) ； 劉煥清(Huan-Ching Liu) ； 孫長新(Chung-Shin Sun) ； 吳孟凡(Meng-Fan Wu) ； 許訓豪(Hsun-Hao Hsu) ； 林俊廷(Chun-Ting Lin)

《科儀新知》 192期 (2013/02) Pp. 40-48

摘要

本文透過實際架設之實驗系統展示一超高資料傳輸速率之60 GHz光載微波無線系統。其光訊號產生方法為透過將單電極馬氏調變器偏壓在低點的簡單架構產生雙邊帶光訊號，再以倍頻方式產生60 GHz毫米波電訊號。基於提高頻譜效益的原因，我們選擇正交分頻多工技術來加密訊號。本文旨在討論雙邊帶光訊號在光纖傳輸時所受到的射頻凋零以及拍擊干擾對訊號傳輸品質的影響。透過理論分析、及軟體VPI WDM-TransmissionMaker模擬以及實際實驗驗證，我們藉由位元存取演算法以及I/Q不平衡補償法，以7GHz的60 GHz正交分頻多工加密訊號達到l公里標準單模光纖傳輸及10公尺無線傳輸下，分別達到資料傳輸率至少40 Gbps的光載微波無線系統。

並列摘要

This paper demonstrates the feasibility of a simple multi gigabit-per-second (Gbps) radio-over-fiber (RoF) system employing multilevel orthogonal frequency-division-multiplexing (OFDM) signal modulation at 60 GHz and a single-electrode Mach-Zehnder modulator (MZM). In this paper, the impact of fiber chromatic dispersion and OFDM beat noise on the performance of the RoF system are investigated by theoretical analysis, VPI WDM-TransmissionMaker simulation, and experimental demonstration. A more than 40 Gbps OFDM signal occupying the full 7 GHz license-free band at 60 GHz with frequency multiplication for the RoF link is demonstrated. In the proposed system, Levin-Campello rate adaptive bit-loading algorithm and I/Q compensation algorithm were used to maximize the system capacity. At least 40 Gbps under condition of 1 km standard single mode fiber transmission and 10 m wireless distance was achieved.