A bias-independent inter-modulation method is proposed and demonstrated for measuring low-frequency modulation and bias half-wave voltages of Mach-Zehnder modulators(MZMs).The method consists of simultaneous sinusoida...A bias-independent inter-modulation method is proposed and demonstrated for measuring low-frequency modulation and bias half-wave voltages of Mach-Zehnder modulators(MZMs).The method consists of simultaneous sinusoidal modulation on the modulation and bias ports of the MZM under test.Sinusoidal-modulated sidebands heterodyne with each other and generate the desired inter-modulation products after photodetection,which allows extracting both the modulation depth and half-wave voltage for the modulation and bias ports of the MZM.Our method is independent of bias voltages of the MZM,which can be canceled out by carefully choosing the sinusoidal-modulation frequencies.Moreover,the proposed method enables the low swing voltage for measuring both the modulation depth and half-wave voltage of MZMs.Experiments indicate that the proposed method features the simple setup and high accuracy for low-frequency response measurement ranging from 1 Hz to 1 MHz.展开更多
A novel method for accurately measuring chromatic dispersion of optical fibers is proposed based on the use of chirped intensity-modulated signals.Unlike the conventional method,the proposed method utilizes the config...A novel method for accurately measuring chromatic dispersion of optical fibers is proposed based on the use of chirped intensity-modulated signals.Unlike the conventional method,the proposed method utilizes the configurable transfer function of optical fibers caused by the residual chirp of intensity modulation,which not only eliminates the chirp error but also improves the measurement range through adjusting the chirp parameter of the intensity modulator.Our method is applicable for measuring both the magnitude and sign of chromatic dispersion of optical fibers or other dispersive devices at different operating wavelengths by using a vector network analyzer.展开更多
基金supported in part by the National Natural Science Foundation of China(Grant No.61927821)National Key Research and Development Program ofChina(Grant No.2018YFE0201900)Fundamental Research Funds for the Central Universities(Grant No.ZYGX2019Z011).
文摘A bias-independent inter-modulation method is proposed and demonstrated for measuring low-frequency modulation and bias half-wave voltages of Mach-Zehnder modulators(MZMs).The method consists of simultaneous sinusoidal modulation on the modulation and bias ports of the MZM under test.Sinusoidal-modulated sidebands heterodyne with each other and generate the desired inter-modulation products after photodetection,which allows extracting both the modulation depth and half-wave voltage for the modulation and bias ports of the MZM.Our method is independent of bias voltages of the MZM,which can be canceled out by carefully choosing the sinusoidal-modulation frequencies.Moreover,the proposed method enables the low swing voltage for measuring both the modulation depth and half-wave voltage of MZMs.Experiments indicate that the proposed method features the simple setup and high accuracy for low-frequency response measurement ranging from 1 Hz to 1 MHz.
基金by the 973 Program of China(grants 2011CB301705 and 2012CB315701)the Open Fund of IPOC(BUPT),the NSFC Program of China(grants 61377037,61378028,and 61090393)the NCET Program(NCET-11-0069),and the Science Foundation for Youths of Sichuan Province(2013JQ0026).
文摘A novel method for accurately measuring chromatic dispersion of optical fibers is proposed based on the use of chirped intensity-modulated signals.Unlike the conventional method,the proposed method utilizes the configurable transfer function of optical fibers caused by the residual chirp of intensity modulation,which not only eliminates the chirp error but also improves the measurement range through adjusting the chirp parameter of the intensity modulator.Our method is applicable for measuring both the magnitude and sign of chromatic dispersion of optical fibers or other dispersive devices at different operating wavelengths by using a vector network analyzer.
