将利用光频梳产生的超级信道引入光标记交换(OLS)系统中。首先, 通过仿真实现了能够产生60根可用谱线的光频梳, 为光标记和超级信道提供了性能良好的光源; 其次, 搭建了超级信道光标记交换系统, 使用正交频分复用(OFDM)的方法产生超级信道, 得到携带1.25Gbit/s光标记的6Tbit/s的超级信道。仿真结果表明：在误码率为10-9时, 超级信道各子信道和光标记的接收光功率分别为-5.3和-18.12dBm, 实现了性能良好的高速光传输。

We present the performance analysis of 112 Gb/s×4 wavelength division multiplexing (WDM) 100 GHz channel spacing polarization division multiplexed-differential quadrature phase shift keying (PDM-DQPSK) optical label switching system with frequency swept coherent detected spectral amplitude code labels. Direct detection is chosen to demodulate the payload by applying a polarization tracker, while 4-bits of 156 Mb/s spectral amplitude code label is coherently detected with a scheme of frequently-swept coherent detection. We optimize the payload laser linewidth as well as the frequency spacing between the payload and label. The label and payload signal performances are assessed by the eye-diagram opening factor (EOF) and bit-error rate (BER) at 10-9 as a function of the received optical power (ROP) and the optical signal to noise ratio (OSNR). The payload could well be demodulated after 900 km at a bit error rate of 10×3 using forward error correction (FEC).

This paper presents a new technique for flat optical frequency comb (OFC) generation, which is based on the nonlinear process of multiple four-wave mixing (FWM) effects. The nonlinear effects are significantly enhanced by using the proposed optical feedback scheme consisting of a single mode fiber (SMF), two highly nonlinear fibers (HNLFs) with different zero dispersion wavelengths (ZDWs) and polarization beam splitters (PBSs). Simulation results illustrate its efficiency and applicability of expanding a comb to 128 coherent lines spaced by only 20 GHz within 6-dB power deviation.

提出一种用于强电场测量的集成光波导电场传感器天线电极设计方案。给出了传感器等效电路, 计算分析了天线、电极的各个参数对传感器半波电场的影响。结果表明: 当传感器电极长度、天线长度由4mm减少到0.5mm时, 传感器半波电场由230kV/m分别增加到2400kV/m和1100kV/m, 提高了943.5%和378.3%;当电极间距、电极宽度由20μm增加到200μm时, 传感器半波电场由400kV/m分别增加为2300kV/m和730kV/m, 提高了475.0%和82.5%;当天线底部宽度由50μm增加到600μm时, 传感器半波电场由460kV/m减小到242kV/m, 减小了47.4%。因此, 合理设计传感器电极、天线尺寸可使其半波电场达到几百kV/m至几千kV/m, 使它能够应用于强电场测量领域。

A Lithium niobate (LiNbO3) based integrated optical E-field sensor with an optical waveguide Mach-Zehnder interferometer (MZI) and a tapered antenna has been designed and fabricated for the measurement of the pulsed electric field. The minimum detectable E-field of the sensor was 10 kV/m. The sensor showed a good linear characteristic while the input E-fields varied from 10 kV/m to 370 kV/m. Furthermore, the maximum detectable E-field of the sensor, which could be calculated from the sensor input/output characteristic, was approximately equal to 1000 kV/m. All these results suggest that such sensor can be used for the measurement of the lighting impulse electric field.

设计了一种基于法布里-珀罗(FP)标准具的双环路光电振荡器(OEO), 该振荡器能将连续的光功率转换为稳定的频谱纯净的微波信号。FP标准具具有滤波的特性, 因此可以替代普通OEO中的电滤波器从而降低电噪声, 此外, FP标准具是一种高Q值的光学器件, 可以缩短普通OEO所使用的光纤长度。双环路结构的引入能够更好地保证振荡器的单模输出, 进一步降低相位噪声。仿真结果证明这种新型结构的OEO可以实现20GHz范围内振荡频率为15GHz的单模起振, 边模抑制比超过150dB, 使用的两条光纤环路长度分别为5m和36m。

给出了集成光学高压脉冲电场传感系统的工作原理, 使用1.2μs/50μs高压脉冲信号作为信号源对传感系统进行测试。分析了探测到的信号中噪声的主要来源: 包括传感器电极、天线及封装外壳等寄生元件产生的寄生振荡, 以及含光源、光电探测器引入的电路噪声等。采用快速傅里叶变换(FFT)对信号源和探测到的信号进行频谱分析, 得到信号源主要集中在0~160kHz范围内, 噪声频率主要集中在大于160kHz范围内。使用基于FPGA的频域数字滤波法对探测到的信号进行去噪声处理, 结果表明信号源与被探测信号的均方误差由在滤除噪声前的20.4277降为滤除噪声后的1.8678。

A novel dual-loop technique was proposed for single-mode selection in an optoelectronic oscillator (OEO). It consisted of a pump laser and a feedback circuit including an intensity modulator, a Fabry-Perot (FP) etalon, two optical fiber delay lines, two photodetectors, and an amplifier. By inserting the Fabry-Perot etalon, the proposed dual-loop OEO realized a single mode oscillation ranging from 0 Hz to 20 GHz. The strong oscillation mode was present at 15 GHz, and the side modes suppression ratio (SMSR) exceeded 140 dB. More over the length of the two fiber loops were just 5 meters and 36 meters.

实验研究中发现LiNbO3集成光波导电场传感器的输出波形中叠加有频率在几百千赫兹左右的振荡信号，导致传感器探测到的电场信号发生畸变。从LiNbO3衬底的压电效应出发对这一谐振现象进行了理论分析。比较谐振频率的理论计算值和实际测量值得知，LiNbO3衬底的宽度是影响谐振的主要因素。针对一种用于雷电电磁脉冲测量的LiNbO3集成光波导电场传感器，其设计衬底宽度为3 mm，再次实验发现振荡信号被抑制在-30 dB以下。