中国激光, 2014, 41 (4): 0405001, 网络出版: 2014-03-25   

基于压缩脉冲载波的远端上变频光载射频系统

Remote Frequency Up-Conversion of Radio over Fiber by Dispersion Compression of Short Pulse
作者单位
清华大学电子工程系, 清华信息科学与技术国家实验室, 北京 100084
摘要
提出并实现了一种用光纤色散压缩脉冲为载波的上变频射频光载系统。该系统把传统的连续光载波替换为频率啁啾脉冲,利用传输光纤色散压缩脉冲宽度,增强谐波分量,使脉冲载波上的信号在接收端转换到脉冲高次谐波上,从而实现了远端上变频。该方法的特点是用低频本振就可实现高频微波信号的产生,发射端无需电倍频器、混频器,接收端只需用滤波器选择所需频率信号,系统结构简单。应用该方法实现了2 Gbit/s信号经60 km普通单模光纤传输后远端上变频到16 GHz、经过5.4 m无线传输后误码率低于10-8的射频光载系统,系统中只有一个光功率放大器,无光在线和预放大以及光滤波器和色散补偿。
Abstract
A scheme on frequency up-conversion of radio-over-fiber (RoF) signal is proposed to use dispersion-compressed short pulse rather than the tradition continuous wave carrier as carrier. By compressing pulse width based on optical fiber dispersion, harmonic component is strengthened, signal component over pulse carrier at the receiving end is converted to higher harmonic waves, and finally the up-conversion is completed at the remote antenna unit (RAU). The generation of high-frequency microwave signal with low frequency local oscillator (LO) doesn′t need any electric frequency multiplier and mixer in transmitting terminal, rather than a filter which can select the desired signal in receiving terminal, and the system is simplified. In this system only with an optical amplifier, 2 Gbit/s signal can be up-converted to 16 GHz after transmission of 60 km standard single-mode fiber (SMF), and the bit error rate (BER) is below 10-8 after 5.4 m wireless communication, no need of on-line, pre-amplification, dispersion compensation and optical filter.

闻和, 陈宽桐, 郑小平, 张汉一, 周炳琨. 基于压缩脉冲载波的远端上变频光载射频系统[J]. 中国激光, 2014, 41(4): 0405001. Wen He, Chen Kuantong, Zheng Xiaoping, Zhang Hanyi, Zhou Bingkun. Remote Frequency Up-Conversion of Radio over Fiber by Dispersion Compression of Short Pulse[J]. Chinese Journal of Lasers, 2014, 41(4): 0405001.

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