通过理论建模,在中心站利用两级平行的马赫-增德尔调制器(Mach-Zehnder modul at or,MZM)组成一个光载毫米波倍频传输系统,两级MZM的射频驱动信号相位相差为45°。在基站利用PIN光电探测器对光信号进行直接探测,得到了纯度较高且频...通过理论建模,在中心站利用两级平行的马赫-增德尔调制器(Mach-Zehnder modul at or,MZM)组成一个光载毫米波倍频传输系统,两级MZM的射频驱动信号相位相差为45°。在基站利用PIN光电探测器对光信号进行直接探测,得到了纯度较高且频率为射频驱动信号频率8倍的毫米波信号。展开更多
消光比是表征光发射机传输性能的重要参数,在诸多国际标准中均有针对消光比的限制。消光比参数的校准一般通过标准源比对的方式,此方法关键在于建立稳定、可调消光比的光信号源,并能够产生尽可能大的消光比数值。本文实现了一种基于级联...消光比是表征光发射机传输性能的重要参数,在诸多国际标准中均有针对消光比的限制。消光比参数的校准一般通过标准源比对的方式,此方法关键在于建立稳定、可调消光比的光信号源,并能够产生尽可能大的消光比数值。本文实现了一种基于级联MZM结构的高消光比信号产生装置,能产生12.5 Gb/s以下速率可调的光数字信号,并能保持输出消光比在12 d B以上。展开更多
提出了一种基于四次乘方射频(radio frequency,RF)信号和级联马赫-曾德尔调制器(Mach-Zehnder modulator,MZM)的梳线可调的光学频率梳(optical frequency comb,OFC)产生方案。利用乘方运算电路对正弦RF信号进行运算耦合,产生的乘方RF信...提出了一种基于四次乘方射频(radio frequency,RF)信号和级联马赫-曾德尔调制器(Mach-Zehnder modulator,MZM)的梳线可调的光学频率梳(optical frequency comb,OFC)产生方案。利用乘方运算电路对正弦RF信号进行运算耦合,产生的乘方RF信号驱动级联的MZM,调制器对输入光进行调制,从而产生梳线数可调的平坦OFC。建立了乘方RF信号驱动级联MZM产生OFC的理论模型,利用OptiSystem软件对其性能进行了研究。结果表明,OFC的梳线间隔是RF信号源频率的2倍,可调谐并且拓展了频谱带宽;产生OFC的目标梳线数是基准调制电压的4倍,实现了梳线数可调谐;调节MZM上下支臂的调制和偏置电压差为确定的优化值,可以使不同目标梳线数的OFC平坦度均小于0.95dB。展开更多
Enhancing the spectral quality of the signal without varying the extinction ratio is a challenge for millimeter(MM)wave generation.Here,we propose a novel extinction ratio tolerant frequency 8-tupling technique using ...Enhancing the spectral quality of the signal without varying the extinction ratio is a challenge for millimeter(MM)wave generation.Here,we propose a novel extinction ratio tolerant frequency 8-tupling technique using two Mach-Zehnder modulators(MZMs)with optimal splitting ratio in parallel configuration.Although the proposed technique is not affected by extinction ratio,a high quality MM wave is still obtained with complete unwanted sideband suppression.Two non-ideal MZMs withπ/2 andπphase shifter realize MZM with optimal splitting ratio,which acts as a high extinction ratio modulator.The 80 GHz MM wave with 62 d B optical sideband suppression ratio(OSSR)and 54 d B radio frequency sideband suppression ratio(RSSR)is generated from 10 GHz local oscillator signal at 2.4036 modulation index(MI).Performance of the present work has been evaluated using various MIs,phase drifts and extinction ratios.Sideband suppression ratio(SSR)greater than 10 d B is reported in a wide MI ranging from 2.36 to 2.47.Further,both the SSRs are tolerant towards MZM extinction ratio.The work is ideal for wavelength division multiplexing(WDM)applications due to its filterless characteristics.展开更多
文摘消光比是表征光发射机传输性能的重要参数,在诸多国际标准中均有针对消光比的限制。消光比参数的校准一般通过标准源比对的方式,此方法关键在于建立稳定、可调消光比的光信号源,并能够产生尽可能大的消光比数值。本文实现了一种基于级联MZM结构的高消光比信号产生装置,能产生12.5 Gb/s以下速率可调的光数字信号,并能保持输出消光比在12 d B以上。
文摘提出了一种基于四次乘方射频(radio frequency,RF)信号和级联马赫-曾德尔调制器(Mach-Zehnder modulator,MZM)的梳线可调的光学频率梳(optical frequency comb,OFC)产生方案。利用乘方运算电路对正弦RF信号进行运算耦合,产生的乘方RF信号驱动级联的MZM,调制器对输入光进行调制,从而产生梳线数可调的平坦OFC。建立了乘方RF信号驱动级联MZM产生OFC的理论模型,利用OptiSystem软件对其性能进行了研究。结果表明,OFC的梳线间隔是RF信号源频率的2倍,可调谐并且拓展了频谱带宽;产生OFC的目标梳线数是基准调制电压的4倍,实现了梳线数可调谐;调节MZM上下支臂的调制和偏置电压差为确定的优化值,可以使不同目标梳线数的OFC平坦度均小于0.95dB。
文摘Enhancing the spectral quality of the signal without varying the extinction ratio is a challenge for millimeter(MM)wave generation.Here,we propose a novel extinction ratio tolerant frequency 8-tupling technique using two Mach-Zehnder modulators(MZMs)with optimal splitting ratio in parallel configuration.Although the proposed technique is not affected by extinction ratio,a high quality MM wave is still obtained with complete unwanted sideband suppression.Two non-ideal MZMs withπ/2 andπphase shifter realize MZM with optimal splitting ratio,which acts as a high extinction ratio modulator.The 80 GHz MM wave with 62 d B optical sideband suppression ratio(OSSR)and 54 d B radio frequency sideband suppression ratio(RSSR)is generated from 10 GHz local oscillator signal at 2.4036 modulation index(MI).Performance of the present work has been evaluated using various MIs,phase drifts and extinction ratios.Sideband suppression ratio(SSR)greater than 10 d B is reported in a wide MI ranging from 2.36 to 2.47.Further,both the SSRs are tolerant towards MZM extinction ratio.The work is ideal for wavelength division multiplexing(WDM)applications due to its filterless characteristics.
