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Modulated bandwidth enhancement in an amplified feedback laser 被引量:1
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作者 余力强 郭露 +3 位作者 陆丹 吉晨 王皓 赵玲娟 《Chinese Optics Letters》 SCIE EI CAS CSCD 2015年第5期45-49,共5页
We report a direct, modulated bandwidth enhancement in a amplified feedback laser (AFL), both experimen- tally and numerically. By means of fabricated devices, an enhanced -3 dB bandwidth of 27 GHz with an in-band f... We report a direct, modulated bandwidth enhancement in a amplified feedback laser (AFL), both experimen- tally and numerically. By means of fabricated devices, an enhanced -3 dB bandwidth of 27 GHz with an in-band flatness of ±3 dB is experimentally confirmed at 13℃. It is numerically confirmed that the modulated bandwidth of the AFL can be enhanced to two times its original bandwidth, with more controlled flexibility to realize a flat, small-signal response. 展开更多
关键词 Modulated bandwidth enhancement in an amplified feedback laser mode AFL DBM DFB PP
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Random-injection-based two-channel chaos with enhanced bandwidth and suppressed time-delay signature by mutually coupled lasers: Proposal and numerical analysis 被引量:2
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作者 Shi-Rong Xu Xin-Hong Jia +3 位作者 Hui-Liang Ma Jia-Bing Lin Wen-Yan Liang Yu-Lian Yang 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第1期239-247,共9页
Simultaneous bandwidth(BW) enhancement and time-delay signature(TDS) suppression of chaotic lasing over a wide range of parameters by mutually coupled semiconductor lasers(MCSLs) with random optical injection are prop... Simultaneous bandwidth(BW) enhancement and time-delay signature(TDS) suppression of chaotic lasing over a wide range of parameters by mutually coupled semiconductor lasers(MCSLs) with random optical injection are proposed and numerically investigated. The influences of system parameters on TDS suppression(characterized by autocorrelation function(ACF) and permutation entropy(PE) around characteristic time) and chaos BW are investigated. The results show that, with the increasing bias current, the ranges of parameters(detuning and injection strength) for the larger BW(> 20 GHz) are broadened considerably, while the parameter range for optimized TDS(< 0.1) is not shrunk obviously.Under optimized parameters, the system can simultaneously achieve two chaos outputs with enhanced BW(> 20 GHz)and perfect TDS suppression. In addition, the system can generate two-channel high-speed truly physical random number sequences at 200 Gbits/s for each channel. 展开更多
关键词 random distributed feedback-based optical injection two-channel chaos lasing bandwidth enhancement and time-delay signature suppression physical random number generation
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Bandwidth-enhanced dual-polarized antenna with improved broadband integrated balun and distributed parasitic element
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作者 Fu Suidao Cao Zhenxin +2 位作者 Gao Di Chen Peng Xu Changzhi 《Journal of Southeast University(English Edition)》 EI CAS 2020年第4期367-375,共9页
A bandwidth-enhanced dual-polarized antenna is proposed for 2/3/4/5G applications,which is composed of distributed parasitic elements(DPEs),a main radiator,two improved broadband integrated baluns and a reflector.Firs... A bandwidth-enhanced dual-polarized antenna is proposed for 2/3/4/5G applications,which is composed of distributed parasitic elements(DPEs),a main radiator,two improved broadband integrated baluns and a reflector.First,a novel tooth-shape shorted slot line in the improved broadband integrated balun is analyzed to adjust the input impedance of the antenna.Then,DPEs with 2×2 circular plates loading over the main radiator are proposed to improve broadband impedance matching and radiation pattern.By utilizing impedance compensation of the tooth-shaped shorted slot line and the electromagnetic induction of the DPEs,the antenna achieves an enhanced impedance bandwidth and a stable radiation pattern.To verify these ideas,the bandwidth-enhanced dual-polarized antenna was fabricated and measured.The experimental results indicate that the proposed antenna achieves an operating bandwidth of 72.2%(1.69 to 3.60 GHz)with a return loss(RL)less than-15 dB and a port-to-port isolation(ISO)larger than 30 dB.The antenna obtains a half-power beamwidth(HPBW)within(66±5)°and a gain within(9.0±0.6)dBi in the 2/3/4G bands,and an HPBW within(61.5±2.5)°and a gain within(9.8±0.3)dBi in the 5G band.Across the whole band,the cross-polarization discrimination(XPD)and the front-to-back ratio are both larger than 20 dB. 展开更多
关键词 dual-polarized antenna bandwidth enhancement integrated balun distributed parasitic elements impedance matching
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A 58-dBΩ20-Gb/s inverter-based cascode transimpedance amplifier for optical communications 被引量:3
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作者 Quan Pan Xiongshi Luo 《Journal of Semiconductors》 EI CAS CSCD 2022年第1期53-58,共6页
This work presents a high-gain broadband inverter-based cascode transimpedance amplifier fabricated in a 65-nm CMOS process.Multiple bandwidth enhancement techniques,including input bonding wire,input series on-chip i... This work presents a high-gain broadband inverter-based cascode transimpedance amplifier fabricated in a 65-nm CMOS process.Multiple bandwidth enhancement techniques,including input bonding wire,input series on-chip inductive peak-ing and negative capacitance compensation,are adopted to overcome the large off-chip photodiode capacitive loading and the miller capacitance of the input device,achieving an overall bandwidth enhancement ratio of 8.5.The electrical measure-ment shows TIA achieves 58 dBΩup to 12.7 GHz with a 180-fF off-chip photodetector.The optical measurement demonstrates a clear open eye of 20 Gb/s.The TIA dissipates 4 mW from a 1.2-V supply voltage. 展开更多
关键词 bandwidth enhancement CMOS optical receiver CASCODE inductive peaking negative capacitance transimpedance amplifier(TIA)
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Metamaterial-Based Compact Antenna with Defected Ground Structure for 5G and Beyond 被引量:2
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作者 Md.Mushfiqur Rahman Md.Shabiul Islam +2 位作者 Mohammad Tariqul Islam Samir Salem Al-Bawri Wong Hin Yong 《Computers, Materials & Continua》 SCIE EI 2022年第5期2383-2399,共17页
In this paper,a unit cell of a single-negative metamaterial structure loaded with a meander line and defected ground structure(DGS)is investigated as the principle radiating element of an antenna.The unit cell antenna... In this paper,a unit cell of a single-negative metamaterial structure loaded with a meander line and defected ground structure(DGS)is investigated as the principle radiating element of an antenna.The unit cell antenna causes even or odd mode resonances similar to the unit cell structure depending on the orientation of the microstrip feed used to excite the unit cell.However,the orientation which gives low-frequency resonance is considered here.The unit cell antenna is then loaded with a meander line which is parallel to the split bearing side and connects the other two sides orthogonal to the split bearing side.This modified structure excites another mode of resonance at high frequency when a meander line defect is loaded on the metallic ground plane.Specific parameters of the meander line structure,the DGS shape,and the unit cell are optimized to place these two resonances at different frequencies with proper frequency intervals to enhance the bandwidth.Finally,the feed is placed in an offset position for better impedance matching without affecting the bandwidth The compact dimension of the antenna is 0.25λL×0.23λL×0.02λL,whereλL is the free space wavelength with respect to the center frequency of the impedance bandwidth.The proposed antenna is fabricated and measured.Experimental results reveal that the modified design gives monopole like radiation patterns which achieves a fractional operating bandwidth of 26.6%,from 3.26 to 4.26 GHz for|S11|<−10 dB and a pick gain of 1.26 dBi is realized.In addition,the simulated and measured crosspolarization levels are both less than−15 dB in the horizontal plane. 展开更多
关键词 Split ring resonator(SRR) meander line defected ground structure compact antenna bandwidth enhancement 5G technology
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