Radio-over-Fiber （RoF） technologies have been considered to be a promising solution to broadband access and ubiquitous sensing. We present a novel approach using dual-wavelength lights to suppress the nonlinear inte...Radio-over-Fiber （RoF） technologies have been considered to be a promising solution to broadband access and ubiquitous sensing. We present a novel approach using dual-wavelength lights to suppress the nonlinear intermodulation distortion in intensity-modulated RoF link both theoretically and experimentally. The system we proposed rminly consists of two Laser Diodes （LDs） at different wavelengths, a commercial available Mach-Zehnder Modulator （MZM） and a Photo Detector （PD）. More than 25 dB suppression of the Third-order Interrnodulation Distortion （IMD3） is achieved by adjusting the wavelength and opti- cal power of the laser. Besides, the output of the MZM is then sent to the photodetector via a single fiber, which simplifies the system complexity for distrbution of RF signals over long distances.展开更多
The error vector magnitude（EVM） is extensively applied as a metric for digital transmitter signal quality compliance in modern communication systems.This article is focused on the effects of local oscillator（LO） p...The error vector magnitude（EVM） is extensively applied as a metric for digital transmitter signal quality compliance in modern communication systems.This article is focused on the effects of local oscillator（LO） phase noise and nonlinear distortion of power amplifier on EVM.This article contributes to below aspects.First,the relationships between EVM and two effects,LO phase noise and nonlinear distortion of power amplifier,are derived and expressed.Second,to simplify the expression,the third-order intermodulation distortion（IMD3） is used to calculate the EVM.Then,an expression for the EVM is derived based on the digital transmitter model that considers local oscillator phase noise and nonlinear distortion of power amplifier.Finally,the math formula of bit error rate（BER） versus EVM is given which can be easier and more useful to predict BER,according to analysis of the relationship between EVM and signal to noise rate（SNR）,inspired by the works of Rishad,Md.Shahriar and AHM,2006.Simulations are carried out to display the performance of EVM based on these relationships.展开更多
基金Acknowledgements This work was supported by the National Basic Research Program of China under Grant No. 2012CB315705 the Hi-Tech Research and Development Program of China under Grant No. 2011AA010306+2 种基金 the National Natural Science Foundation of China under Grants No. 60736002, No. 60932004, No. 61001121, No. 61107058 and No. 61120106001 the Beijing Excellent Doctoral Thesis Project under Grant No. YB20101001301 and the Cooperation Project between Province and Ministries under Grant No. 201013090400112.
文摘Radio-over-Fiber （RoF） technologies have been considered to be a promising solution to broadband access and ubiquitous sensing. We present a novel approach using dual-wavelength lights to suppress the nonlinear intermodulation distortion in intensity-modulated RoF link both theoretically and experimentally. The system we proposed rminly consists of two Laser Diodes （LDs） at different wavelengths, a commercial available Mach-Zehnder Modulator （MZM） and a Photo Detector （PD）. More than 25 dB suppression of the Third-order Interrnodulation Distortion （IMD3） is achieved by adjusting the wavelength and opti- cal power of the laser. Besides, the output of the MZM is then sent to the photodetector via a single fiber, which simplifies the system complexity for distrbution of RF signals over long distances.
基金supported by the National Natural Science Foundation Project of CQ CSTC of China (2008BB2168)
文摘The error vector magnitude（EVM） is extensively applied as a metric for digital transmitter signal quality compliance in modern communication systems.This article is focused on the effects of local oscillator（LO） phase noise and nonlinear distortion of power amplifier on EVM.This article contributes to below aspects.First,the relationships between EVM and two effects,LO phase noise and nonlinear distortion of power amplifier,are derived and expressed.Second,to simplify the expression,the third-order intermodulation distortion（IMD3） is used to calculate the EVM.Then,an expression for the EVM is derived based on the digital transmitter model that considers local oscillator phase noise and nonlinear distortion of power amplifier.Finally,the math formula of bit error rate（BER） versus EVM is given which can be easier and more useful to predict BER,according to analysis of the relationship between EVM and signal to noise rate（SNR）,inspired by the works of Rishad,Md.Shahriar and AHM,2006.Simulations are carried out to display the performance of EVM based on these relationships.
