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A High-Performance Silicon Electro-Optic Phase Modulator with a Triple MOS Capacitor 被引量:2
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作者 黄北举 陈弘达 +2 位作者 刘金彬 顾明 刘海军 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第12期2089-2093,共5页
We propose and analyze a novel Si-based electro-optic modulator with an improved metal-oxide-semiconductor (MOS) capacitor configuration integrated into silicon-on-insulator (SOl). Three gate-oxide layers embedded... We propose and analyze a novel Si-based electro-optic modulator with an improved metal-oxide-semiconductor (MOS) capacitor configuration integrated into silicon-on-insulator (SOl). Three gate-oxide layers embedded in the silicon waveguide constitute a triple MOS capacitor structure, which boosts the modulation efficiency compared with a single MOS capacitor. The simulation results demonstrate that the Vπ Lπ product is 2. 4V · cm. The rise time and fall time of the proposed device are calculated to be 80 and 40ps from the transient response curve, respectively,indicating a bandwidth of 8GHz. The phase shift efficiency and bandwidth can be enhanced by rib width scaling. 展开更多
关键词 carrier accumulation plasma dispersion effect electro-optic phase modulator METAL-OXIDE-SEMICONDUCTOR optoelectronic integrated circuit
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Modulation Recognition with Frequency Offset and Phase Offset over Multipath Channels 被引量:1
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作者 Mingqian Liu Zhaoxi Wen +1 位作者 Yunfei Chen Ming Li 《China Communications》 SCIE CSCD 2023年第10期58-69,共12页
Modulation recognition becomes unreliable at low signal-to-noise ratio(SNR)over fading channel.A novel method is proposed to recognize the digital modulated signals with frequency and phase offsets over multi-path fad... Modulation recognition becomes unreliable at low signal-to-noise ratio(SNR)over fading channel.A novel method is proposed to recognize the digital modulated signals with frequency and phase offsets over multi-path fading channels in this paper.This method can overcome the effects of phase offset,Gaussian noise and multi-path fading.To achieve this,firstly,the characteristic parameters search is constructed based on the cyclostationarity of received signals,to overcome the phase offset,Gaussian white noise,and influence caused by multi-path fading.Then,the carrier frequency of the received signal is estimated,and the maximum characteristic parameter is searched around the integer multiple carriers and their vicinities.Finally,the modulation types of the received signal with frequency and phase offsets are classified using decision thresholds.Simulation results demonstrate that the performance of the proposed method is better than the traditional methods when SNR is over 5dB,and that the proposed method is robust to frequency and phase offsets over multipath channels. 展开更多
关键词 cyclic characteristics frequency and phase offset multi-path channels modulation recognition
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Fast generation of controllable equal-intensity four beams based on isosceles triangle multilevel phase grating realized by liquid crystal spatial light modulator 被引量:1
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作者 刘翔 张健 +1 位作者 吴丽莹 甘雨 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第2期287-294,共8页
Liquid crystal spatial light modulator (LCSLM) realizing equal-intensity multiple beams often has some features, i.e., phase valley between two adjacent pixels, flybaek region when phase decreases immediately from 2... Liquid crystal spatial light modulator (LCSLM) realizing equal-intensity multiple beams often has some features, i.e., phase valley between two adjacent pixels, flybaek region when phase decreases immediately from 2~r to 0, and inevitable backplane curvature, which are different from those of most conventional diffractive optical elements (DOEs), such as static DOEs. For optimal intensity uniformity, equal-intensity multi-beam generation must be considered for these artifacts. We present a tunable-grating method in which the intensity uniformity can be improved by considering the LCSLM artifacts. For instance, tuning phase modulation depth of the grating, called isosceles triangle multilevel phase grating (ITMPG), can be used not only to improve the intensity uniformity, but also to fast steer four beams with narrow beamwidths, determined by the same effective aperture of ITMPG. Improved intensity uniformity and high relative diffraction efficiency are demonstrated through experiments with phase-only LCSLM. 展开更多
关键词 liquid crystal spatial light modulator phase grating SPLITTER
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A fractional frequency divider based on phase switching and negative feedback delta-sigma modulator for MMMS applications 被引量:1
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作者 Liao Yilong Fan Xiangning +2 位作者 Lin Zhi Shi Yongjian Hua Zaijun 《High Technology Letters》 EI CAS 2019年第3期231-238,共8页
A fractional frequency divider based on phase switching and negative feedback delta-sigma modulator(NF-DSM) is presented. The phase switching circuit, realized by switching 8 signals generated by a divider-by-4 circui... A fractional frequency divider based on phase switching and negative feedback delta-sigma modulator(NF-DSM) is presented. The phase switching circuit, realized by switching 8 signals generated by a divider-by-4 circuit, is adopted to reduce the frequency division step. The NF-DSM, which can obtain smooth output spectra, is proposed to generate the fractional part of the division ratio, moreover, the integer part of the division ratio is realized by a divider-by-2/3 circuit chain. Fabricated in TSMC 0.18 μm RF CMOS technology, the fractional frequency divider achieves a measured operation frequency from 0.5 GHz to 8 GHz. With a 1.8 V supply voltage, the maximum current consumption of the whole divider is 17.5 mA, and the chip area is 0.58 mm^2, including the pads. 展开更多
关键词 delta-sigma modulator(DSM) divider-by-2/3 frequency divider phase switching
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Bunching enhancement for coherent harmonic generation by using phase merging effects
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作者 Ke Feng Kangnan Jiang +3 位作者 Runshu Hu Shixia Luan Wentao Wang Ruxin Li 《Matter and Radiation at Extremes》 SCIE EI CSCD 2024年第5期10-21,共12页
In this paper,promising but simple schemes are investigated to enhance the micro-bunching of relativistic electron beams for coherent harmonic generation(CHG)by using phase merging effects.In contrast to the standard ... In this paper,promising but simple schemes are investigated to enhance the micro-bunching of relativistic electron beams for coherent harmonic generation(CHG)by using phase merging effects.In contrast to the standard CHG scheme,two specially designed dispersion sections(DSs)are adopted with the DS-modulator–DS configuration.The phase space of the e beam is appropriately coupled in the first DS,and the electrons within one seed wavelength can merge to the same phase with a matched second DS.Micro-bunching of the e beam can thus be enhanced by a large margin with much higher-harmonic components.Taking e beams from laser wakefield accelerators(LWFAs)as an example,start-to-end simulations are performed to show the effectiveness and robustness of the proposed schemes with several configurations.The beam current can be optimized to several tens to hundreds of kiloamperes,and the radiation power reaches hundreds of megawatts in the extreme ultraviolet regime within a 3.5 m-long beamline.The proposed schemes offer new opportunities for future compact free-electron lasers driven by LWFAs and provides prospects for truly compact and widely applicable systems. 展开更多
关键词 modulator HARMONIC phase
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Security-Enhanced Directional Modulation Based on Two-Dimensional M-WFRFT
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作者 Zhou Zhuang Luo Junshan +1 位作者 Wang Shilian Xia Guojiang 《China Communications》 SCIE CSCD 2024年第5期229-248,共20页
Directional modulation(DM)is one of the most promising secure communication techniques.However,when the eavesdropper is co-located with the legitimate receiver,the conventional DM has the disadvantages of weak anti-sc... Directional modulation(DM)is one of the most promising secure communication techniques.However,when the eavesdropper is co-located with the legitimate receiver,the conventional DM has the disadvantages of weak anti-scanning capability,anti-deciphering capability,and low secrecy rate.In response to these problems,we propose a twodimensional multi-term weighted fractional Fourier transform aided DM scheme,in which the legitimate receiver and the transmitter use different transform terms and transform orders to encrypt and decrypt the confidential information.In order to further lower the probability of being deciphered by an eavesdropper,we use the subblock partition method to convert the one-dimensional modulated signal vector into a twodimensional signal matrix,increasing the confusion of the useful information.Numerical results demonstrate that the proposed DM scheme not only provides stronger anti-deciphering and anti-scanning capabilities but also improves the secrecy rate performance of the system. 展开更多
关键词 bit error rate directional modulation phased array secrecy rate weighted fractional Fourier transform
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Transmission Performance of the Optical Millimeter-wave Up-conversion Link Using a Phase Modulator
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作者 ZENG Jun-Ying YU Chong-Xiu 《Semiconductor Photonics and Technology》 CAS 2009年第4期209-213,共5页
Numerically analyzed is the transmission performance of the optical millimeter (mm)-wave generated by frequency up-conversion via a phase modulator along the dispersive fiber. 60 GHz ram-wave subcarrier(SC) signal... Numerically analyzed is the transmission performance of the optical millimeter (mm)-wave generated by frequency up-conversion via a phase modulator along the dispersive fiber. 60 GHz ram-wave subcarrier(SC) signals can be obtained after fiber transmission, simultaneously, the phase-modulated signals can be converted to the intensity-modulated ones. The numerical results show that the optical ram-wave at fading loops has better performance, and the eye diagram still keeps open when optical mm-wave signal is transmitted over 98 km. 展开更多
关键词 optical millimeter-wave up-conversion link phase modulator fiber transmission
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Optimizing effective phase modulation in coupled double quantum well Mach–Zehnder modulators
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作者 王光辉 张金珂 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第2期563-569,共7页
We report optimal phase modulation based on enhanced electro–optic effects in a Mach–Zehnder(MZ) modulator constructed by AlGaAs/GaAs coupled double quantum well(CDQW) waveguides with optical gain. The net chang... We report optimal phase modulation based on enhanced electro–optic effects in a Mach–Zehnder(MZ) modulator constructed by AlGaAs/GaAs coupled double quantum well(CDQW) waveguides with optical gain. The net change of refractive indexes between two arms of the CDQW MZ modulator is derived by both the electronic polarization method and the normal-surface method. The numerical results show that very large refractive index change over 10^(-1) can be obtained, making the phase modulation in the CDQW MZ modulator very highly efficient. It is desirable and important that a very small voltage-length product for π phase shift, V_π× L_0= 0.0226 V · mm, is obtained by optimizing bias electric field and CDQW structural parameters, which is about seven times smaller than that in single quantum-well MZ modulators.These properties open an avenue for CDQW nanostructures in device applications such as electro–optical switches and phase modulators. 展开更多
关键词 electro–optic effect phase modulator quantum well
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Phase Modulation Characteristics of Spatial Light Modulator and the System for Its Calibration
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作者 Zhang Gongjian Zhang Man Zhao Yang 《Journal of Electrical Engineering》 2018年第4期193-205,共13页
The phase modulation characteristics of liquid crystal SLM (spatial light modulator) and the system for calibrating are proposed. Michelson interferometer is employed for measuring the modulation properties of devic... The phase modulation characteristics of liquid crystal SLM (spatial light modulator) and the system for calibrating are proposed. Michelson interferometer is employed for measuring the modulation properties of device. A system interface for operating SLM is designed with VC++ compiler. The initial distortion phase is determined by measuring the reflective interference, and modulation of device is compensated by using our system. By using the LUT (lookup table) data provided by manufacture the wavelength disperse calibration is also achieved successfully. 展开更多
关键词 liquid crystal SLM phase modulation wavefront correction adaptive optics.
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A Pulse Width Modulation Scheme With Zero-sequence Voltage Injection for Single Phase Three-level NPC Rectifiers 被引量:9
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作者 宋文胜 冯晓云 《中国电机工程学报》 EI CSCD 北大核心 2011年第36期I0003-I0003,共1页
直流侧中点电位电压偏移是多电平中性点钳位型变流器的主要缺点。以单相三电平NPC整流器为研究对象,以实现直流侧中点电位无漂移为控制目标,以传统的单相三电平单极性载波脉宽调制方法为基础,首先提出一种基于零序电压分量注入的载... 直流侧中点电位电压偏移是多电平中性点钳位型变流器的主要缺点。以单相三电平NPC整流器为研究对象,以实现直流侧中点电位无漂移为控制目标,以传统的单相三电平单极性载波脉宽调制方法为基础,首先提出一种基于零序电压分量注入的载波脉宽调制算法;然后在此基础上给出基于零序电压分量极限值注入的载波脉宽调制算法;并给出这2种方法的零序电压分量的设计方案;最后,对这2种方法进行了详细的理论分析、计算机仿真和1kW样机实验对比验证。研究结果表明:所提出的2种算法都能有效实现直流侧中点电位平衡控制,其中基于零序电压分量极限值注入的载波调制算法的中点电位控制具有更快动态响应速度,且其网侧电流的高次谐波主要分布在开关频率附近;而基于零序电压分量注入的载波调制算法的网侧电流高次谐波主要分布在2倍开关频率附近。但是在一个调制信号周期内,基于零序电压分量极限值注入的载波调制算法的开关切换次数比基于零序电压分量注入的载波调制算法低25%左右。 展开更多
关键词 三电平 脉冲宽度 零序电压 单相 整流器 中性点电压 调制 直流母线
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Experimental implementation of phase triplicator gratings in a spatial light modulator
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作者 高尚 María del Mar Sánchez-López Ignacio Moreno 《Chinese Optics Letters》 SCIE EI CAS CSCD 2024年第2期64-69,共6页
In this work,we compare different methods for implementing a triplicator,a phase grating that generates three equiintense diffraction orders.The design with optimal efficiency features a continuous phase profile,which... In this work,we compare different methods for implementing a triplicator,a phase grating that generates three equiintense diffraction orders.The design with optimal efficiency features a continuous phase profile,which cannot be easily reproduced,and is typically affected by quantization.We compare its performance with binary and sinusoidal phase profiles.We also analyze the effect of quantizing the phase levels.Finally,a random approach is adopted to eliminate the additional harmonic orders.In all cases,a liquid-crystal-on-silicon spatial light modulator is employed to experimentally verify and compare the different approaches. 展开更多
关键词 diffraction gratings phase modulation triplicator spatial light modulators
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Influence of random phase modulation on the imaging quality of computational ghost imaging 被引量:4
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作者 Chao Gao Xiao-Qian Wang +3 位作者 Hong-Ji Cai Jie Ren Ji-Yuan Liu Zhi-Hai Yao 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第2期77-81,共5页
In this paper, we investigated phase modulation-based computational ghost imaging. According to the results of numerical simulations, we found that the range of the random phase affects the quality of the reconstructe... In this paper, we investigated phase modulation-based computational ghost imaging. According to the results of numerical simulations, we found that the range of the random phase affects the quality of the reconstructed image. Besides,compared with those amplitude modulation-based computational ghost imaging schemes, introducing random phase modulation into the computational ghost imaging scheme could significantly improve the spatial resolution of the reconstructed image, and also extend the field of view. 展开更多
关键词 COMPUTATIONAL GHOST IMAGING RANDOM phase modulATION IMAGING quality
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Parallel generation of low-correlation wideband complex chaotic signals using CW laser and external-cavity laser with self-phase-modulated injection 被引量:8
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作者 Anke Zhao Ning Jiang +3 位作者 Jiafa Peng Shiqin Liu Yiqun Zhang Kun Qiu 《Opto-Electronic Advances》 SCIE EI 2022年第5期49-56,共8页
A novel scheme for generating optical chaos is proposed and experimentally demonstrated,which supports to simultaneously produce two low-correlation chaotic signals with wideband spectrum and suppressed time-delay-sig... A novel scheme for generating optical chaos is proposed and experimentally demonstrated,which supports to simultaneously produce two low-correlation chaotic signals with wideband spectrum and suppressed time-delay-signature(TDS).In the proposed scheme,we use the output of an external-cavity semiconductor laser(ECSL)as the driving signal of a phase modulator to modulate the output of a CW laser.Then the phase-modulated continuous-wave(CW)light is split into two parts,one is injected back into the ECSL that outputs one chaotic signal,while the other part is passed through a dispersion module for generating another chaotic signal simultaneously.The experimental results prove that the proposed scheme has three merits.Firstly,it can improve the bandwidth of ECSL-based chaos by several times,and simultaneously generate another wideband flat-spectrum chaotic signal.Secondly,the undesired TDS characteristics of the simultaneously-generated chaotic signals can be efficiently suppressed to an indistinguishable level within a wide parameter range,as such the complexities of the chaotic signals are considerably high.Thirdly,the correlation coefficient between these two simultaneously-generated chaotic signals is smaller than 0.1.The proposed scheme provides an attractive solution for parallel multiple chaos generation,and shows great potential for multiple channel chaos communications and multiple random bit generations. 展开更多
关键词 optical chaos optical feedback semiconductor laser electro-optic phase modulation
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Phase-matching analysis of four-wave mixing induced by modulation instability in a single-mode fiber 被引量:2
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作者 陈伟 孟洲 周会娟 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第9期332-337,共6页
Four-wave mixing induced by modulation instability in a single-mode fiber is analyzed from the phase-matching point of view. For the two-channel transmission, a method is proposed to select the four-wave-mixing-induce... Four-wave mixing induced by modulation instability in a single-mode fiber is analyzed from the phase-matching point of view. For the two-channel transmission, a method is proposed to select the four-wave-mixing-induced sidebands, which is based on the proper use of a continuous-wave and a pulse as light sources. We find that a mass of sidebands are generated in the modulation instability resonance region, and the power of the sideband increases with not only the peak power of the pump pulse but also the continuous-wave power which acts as a seed. The research will provide guidance for fiber communication and sensing systems using wavelength division multiplexing technology. 展开更多
关键词 four-wave mixing modulation instability phase matching
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An all-optical phase detector by amplitude modulation of the local field in a Rydberg atom-based mixer 被引量:3
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作者 Xiu-Bin Liu Feng-Dong Jia +8 位作者 Huai-Yu Zhang Jiong Mei Wei-Chen Liang Fei Zhou Yong-Hong Yu Ya Liu Jian Zhang Feng Xie Zhi-Ping Zhong 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第9期254-259,共6页
Recently,a Rydberg atom-based mixer was developed to measure the phase of a radio frequency(RF)field.The phase of the signal RF(SIG RF)field is down-converted directly to the phase of a beat signal created by the pres... Recently,a Rydberg atom-based mixer was developed to measure the phase of a radio frequency(RF)field.The phase of the signal RF(SIG RF)field is down-converted directly to the phase of a beat signal created by the presence of a local RF(LO RF)field.In this study,we propose that the Rydberg atom-based mixer can be converted to an all-optical phase detector by amplitude modulation(AM)of the LO RF field;that is,the phase of the SIG RF field is related to both the amplitude and phase of the beat signal.When the AM frequency of the LO RF field is the same as the frequency of the beat signal,the beat signal will further interfere with the AM of the LO RF field inside the atom,and then the amplitude of the beat signal is related to the phase of the SIG RF field.The amplitude of the beat signal and the phase of the SIG RF field show a linear relationship within the range of 0 toπ/2 when the phase of the AM is set with a differenceπ/4 from the phase of the LO RF field.The minimum phase resolution can be as small as 0.6°by optimizing the experimental conditions according to a simple theoretical model.This study will expand and contribute to the development of RF measurement devices based on Rydberg atoms. 展开更多
关键词 quantum sensor phase detector Rydberg atoms micorwave electromagnetically induced transparency amplitude modulation
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Equalization for continuous phase modulation over frequency-selective fading channels 被引量:2
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作者 JIN Xiao-dong ZHAO Min-jian +1 位作者 SUN Ling SHEN Wen-li 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2007年第12期1884-1888,共5页
This paper presents an equalization algorithm for continuous phase modulation (CPM) over frequency-selective channels. A specific training sequence is first embedded in each data packet. By recursive least-squares ... This paper presents an equalization algorithm for continuous phase modulation (CPM) over frequency-selective channels. A specific training sequence is first embedded in each data packet. By recursive least-squares (RLS) estimation, the channel information parameters can be acquired, and a fractionally Simulation results show that the proposed algorithm can acquire the spaced equalizer performs joint decoding and equalization. channel information parameters rapidly and accurately, and that the fractionally spaced equalizer can eliminate the intersymbol interference (ISI) effectively, and is not sensitive to timing inaccuracy, so this algorithm can be exploited for demodulation system in burst mode. 展开更多
关键词 M-ary continuous phase modulation (CPM) Channel-estimation Joint decoding and equalization Fractionally spaced
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SERIALLY CONCATENATED CONTINUOUS PHASE MODULATION WITH REDUCED ITERATIVE DEMODULATION AND DETECTION 被引量:3
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作者 Sun Jinhua Li Jiandong Jin Lijun 《Journal of Electronics(China)》 2007年第1期16-22,共7页
A reduced state Soft Input Soft Output (SISO) a posteriori probability algorithm for Seri-ally Concatenated Continuous Phase Modulation (SCCPM) is proposed in this paper. Based on the Reduced State Sequence Detection ... A reduced state Soft Input Soft Output (SISO) a posteriori probability algorithm for Seri-ally Concatenated Continuous Phase Modulation (SCCPM) is proposed in this paper. Based on the Reduced State Sequence Detection (RSSD),it has more general form compared with other reduced state SISO algorithms. The proposed algorithm can greatly reduce the state number,thus leads to the computation complexity reduction. It also minimizes the degradation in Euclidean distance with decision feedback in the reduced state trellis. Analysis and simulation results show that the perform-ance degradation is little with proper reduction scheme. 展开更多
关键词 Concatenated codes Continuous phase modulation (CPM) Soft Input Soft Output (SISO) Euclidean distance
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Hybrid Method to Identify Second-trip Echoes Using Phase Modulation and Polarimetric Technology 被引量:1
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作者 Shuai ZHANG Jinzhong MIN +3 位作者 Chian ZHANG Xingyou HUANG Jun LIU Kaihua WEI 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2021年第3期480-492,共13页
For pulse Doppler radars,the widely used method for identifying second-trip echoes(STs)in the signal processing level yields significant misidentification in regions of high turbulence and severe wind shear.In the dat... For pulse Doppler radars,the widely used method for identifying second-trip echoes(STs)in the signal processing level yields significant misidentification in regions of high turbulence and severe wind shear.In the data processing level,although the novel algorithm for ST identification does not yield significant misidentification in specific regions,its overall identification performance is not ideal.Therefore,this paper proposes a hybrid method for the identification of STs using phase modulation(signal processing)and polarimetric technology(data processing).Through this approach,most of the STs are removed,whereas most of the first-trip echoes(FTs)remain untouched.Compared with the existing method using a signal quality index filter with an optimized threshold,the hybrid method exhibits superior performance(Heidke skill scores of 0.98 versus 0.88)on independent test datasets,especially in high-turbulence and severe-wind-shear regions,for which misidentification is significantly reduced. 展开更多
关键词 second-trip echo phase modulation polarimetric radar wind shear
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Dual-Use Signal Design for Radar and Communication via Joint Orthogonal Signal and Phase Modulation 被引量:1
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作者 Yu Lin Yi Bu +3 位作者 Hui Qiu Xue Yao Xianxiang Yu Guolong Cui 《Journal of Beijing Institute of Technology》 EI CAS 2021年第1期20-30,共11页
This paper proposes a new information modulation resorting to orthogonal signal and its phase for dual-function radar communication(DFRC)systems.Focusing on the standardized linear frequency modulation(LFM)signal by a... This paper proposes a new information modulation resorting to orthogonal signal and its phase for dual-function radar communication(DFRC)systems.Focusing on the standardized linear frequency modulation(LFM)signal by additional phase,a bank of signals enjoying satisfactory autocorrelation and cross-correlation characteristics,are generated.Then,these signals map the different information as well as their phases are also modulated to increase the communication bit rate,thus yielding a series of dual-use signals.Finally,the radar detection and communication performance of dual-use signals are also provided through numerical simulation and half-physical platform verification,confirming the effectiveness of the designed signals compared with the existing design strategy. 展开更多
关键词 dual-function radar communication(DFRC) dual-use signal joint orthoganal signal and phase modulation
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Effects of walk-off on cross-phase modulation induced modulation instability in an optical fibre with high-order dispersion 被引量:1
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作者 钟先琼 向安平 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第6期1683-1688,共6页
This paper investigates the effects of walk-off among optical pulses on cross-phase modulation induced modulation instability in the normal dispersion region of an optical fibre with high-order dispersion. The results... This paper investigates the effects of walk-off among optical pulses on cross-phase modulation induced modulation instability in the normal dispersion region of an optical fibre with high-order dispersion. The results indicate that, in the case of high-order dispersion, the walk-off effect takes on new characteristics and will influence considerably the shape, position and especially the number of the spectral regions of the gain spectra of modulation instability. Not only the group-velocity mismatch, but also the difference of the third-order dispersion of two optical waves will alter the gain spectra of modulation instability but in different ways. Depending on the values of the walk-off parameters, the number of the spectral regions may increase from two to at most four, and the spectral shape and position may change too. 展开更多
关键词 modulation instability cross-phase modulation walk-off effect the difference ofthe third-order dispersion
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