Optical up-conversion of single sideband signal using frequency quadrupling technique for radio over fiber system

2014 13th International Conference on Optical Communications and Networks (ICOCN) Pub Date : 2014-11-01 DOI:10.1109/ICOCN.2014.6987135

Y. Gu, Jingjing Hu, Z. Kang, Nuannuan Shi, Zhenlin Wu, Xiuyou Han, Mingshan Zhao

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Abstract

This paper proposes a novel method for optical up-converted single-sideband (SSB) signal generation in radio over fiber link, capable of high tolerance of fiber chromatic dispersion induced carrier fading effect. The OSSB signal, is generated by utilizing one low-bandwidth intensity modulator (IM) under frequency quadrupling modulation scheme with low-frequency local oscillator (LO) signal and one low-bandwidth IM biased at the null point in combination with fiber grating. With this up-converted SSB technique, a 26 GHz optical SSB radio frequency (RF) signal is generated by mixing a low frequency local oscillator (LO) signal (5.5GHz) and an intermediate frequency (IF) signal (4 GHz) carrying 80 Mbps quadrature phase shift keying (QPSK) vector signal. The signal is transmitted over 45 km standard single-mode fiber (SMF) successfully and shows negligible dispersion-induced carrier suppression effect. The received signal error vector magnitude (EVM) is 13% rms and 15.7 % rms before and after transmission over 45-km SMF.

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利用四倍频技术实现光纤无线通信系统中单边带信号的上变频

提出了一种在光纤无线电链路中产生光上转换单边带(SSB)信号的新方法，该方法能够高度耐受光纤色散引起的载波衰落效应。OSSB信号由一个低带宽强度调制器(IM)和一个低带宽强度调制器(IM)在低频本振(LO)信号的四倍频调制方案下产生，一个低带宽强度调制器与光纤光栅组合在零点偏置。利用这种上转换SSB技术，通过混合低频本振(LO)信号(5.5GHz)和携带80 Mbps正交相移键控(QPSK)矢量信号的中频(IF)信号(4 GHz)产生26 GHz光SSB射频(RF)信号。该信号在45km标准单模光纤(SMF)上传输成功，色散载波抑制效应可以忽略不计。接收到的信号误差矢量幅值(EVM)在传输前后分别为13% rms和15.7% rms。

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2014 13th International Conference on Optical Communications and Networks (ICOCN)

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