In order to solve the problem of spectrum efficiency loss caused by grouped modulation in subcarrier index modulated OFDM system, a multidimensional modulation method based on grouped subcarrier index modulated OFDM is proposed. This method makes the number of silent subcarriers as an extra modulation dimension, so as to increase the number of bits carried on SIM-OFDM symbol and improve the spectrum efficiency of the system. According to the simulation result, although the BER of multidimensional modulated GSIM-OFDM system is a little higher than that of traditional GSIM-OFDM system, the spectrum efficiency of the system with the proposed method is also better than that of the system with traditional grouped modulation method. What's more, the more groups, the more obvious the advantage of spectrum efficiency.
{"title":"Multidimensional Modulation Method based on Grouped Subcarrier Index Modulated OFDM","authors":"Xin Wang, Qi Zhang, Ran Gao, Xishuo Wang, X. Xin, Feng Tian, Qinghua Tian, Yongjun Wang, Dong Guo, Huan Chang","doi":"10.1109/ICOCN53177.2021.9563709","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563709","url":null,"abstract":"In order to solve the problem of spectrum efficiency loss caused by grouped modulation in subcarrier index modulated OFDM system, a multidimensional modulation method based on grouped subcarrier index modulated OFDM is proposed. This method makes the number of silent subcarriers as an extra modulation dimension, so as to increase the number of bits carried on SIM-OFDM symbol and improve the spectrum efficiency of the system. According to the simulation result, although the BER of multidimensional modulated GSIM-OFDM system is a little higher than that of traditional GSIM-OFDM system, the spectrum efficiency of the system with the proposed method is also better than that of the system with traditional grouped modulation method. What's more, the more groups, the more obvious the advantage of spectrum efficiency.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78300632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Optical delay lines (ODL) are one of the key components in integrated photonic circuits and systems. We propose a novel optical delay line structure based on multimode conversion. The silicon multi-mode converter is optimized via an inverse design method to simultaneously convert the $mathbf{TEi}$ modes to $mathbf{TE}_{mathrm{i}}+1$ modes $(mathbf{i}=1,2$, and 3) at the wavelength of 1550 nm. It only occupies an area of 4 $mu mathbf{m}times 3 mumathbf{m}$. Simulation results show that the insertion loss of the mode-order converter is less than 1.6 dB and the crosstalk is lower than −22 dB for all three modes.
{"title":"Ultra-Compact Multi-Mode Converter for Optical Delay Line Application","authors":"Ningning Wang, Xing Yang, Di Wu, Liangjun Lu, Jianping Chen, Linjie Zhou","doi":"10.1109/ICOCN53177.2021.9563676","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563676","url":null,"abstract":"Optical delay lines (ODL) are one of the key components in integrated photonic circuits and systems. We propose a novel optical delay line structure based on multimode conversion. The silicon multi-mode converter is optimized via an inverse design method to simultaneously convert the $mathbf{TEi}$ modes to $mathbf{TE}_{mathrm{i}}+1$ modes $(mathbf{i}=1,2$, and 3) at the wavelength of 1550 nm. It only occupies an area of 4 $mu mathbf{m}times 3 mumathbf{m}$. Simulation results show that the insertion loss of the mode-order converter is less than 1.6 dB and the crosstalk is lower than −22 dB for all three modes.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79842472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-23DOI: 10.1109/ICOCN53177.2021.9563645
M. Qiu, Mengmeng Chen, Zuxing Zhang
We propose and demonstrate a wavelength-switchable spatiotemporal mode-locked multimode fiber laser, which relies on spatial beam self-cleaning via the nonlinear Kerr effect to attain high pulse energy with near Gaussian output beam shape. Moreover, it is found that the wavelength-dependent self-cleaning behavior observed at different wavelengths has distinct threshold. The experimental results are valuable for further comprehend the dynamic characteristics of spatiotemporal mode-locked multimode fiber laser, making them much more accessible for applications.
{"title":"Wavelength-switchable spatiotemporal mode-locked multimode fiber laser","authors":"M. Qiu, Mengmeng Chen, Zuxing Zhang","doi":"10.1109/ICOCN53177.2021.9563645","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563645","url":null,"abstract":"We propose and demonstrate a wavelength-switchable spatiotemporal mode-locked multimode fiber laser, which relies on spatial beam self-cleaning via the nonlinear Kerr effect to attain high pulse energy with near Gaussian output beam shape. Moreover, it is found that the wavelength-dependent self-cleaning behavior observed at different wavelengths has distinct threshold. The experimental results are valuable for further comprehend the dynamic characteristics of spatiotemporal mode-locked multimode fiber laser, making them much more accessible for applications.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80311703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-23DOI: 10.1109/ICOCN53177.2021.9563900
Shujie Mu
To solve the problem of low efficiency in wavenumber domain imaging of circular synthetic aperture radar (CSAR), a novel circular convolution algorithm based on compressed sensing is proposed, which can avoid the complex calculation in by compressed sensing algorithm and the simulation results show that the algorithm can effectively improve the imaging quality.
{"title":"A Novel Circular Convolution Imaging Algorithm Based on Compressed Sensing for CSAR","authors":"Shujie Mu","doi":"10.1109/ICOCN53177.2021.9563900","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563900","url":null,"abstract":"To solve the problem of low efficiency in wavenumber domain imaging of circular synthetic aperture radar (CSAR), a novel circular convolution algorithm based on compressed sensing is proposed, which can avoid the complex calculation in by compressed sensing algorithm and the simulation results show that the algorithm can effectively improve the imaging quality.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82518956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper mainly studied the ethanol gas sensing characteristics of silica microbottle resonator coupled with non-adiabatic tapered fiber based on whispering gallery mode (WGM). The main research contents were the bulk refractive index sensitivity of silica microbottle resonator and the sensing characteristics of ethanol gas after being coated with graphene oxide (GO) and polydimethylsiloxane (PDMS), respectively. Experiments reveal that the bulk refractive index sensitivity of the silica microbottle resonator is 21.14941nm/RIU. The sensitivity of WGM silica microbottle resonator coated with GO to ethanol gas is about 1.55 pm/ppm. For the silica microbottle resonator sensor coated with PDMS, the sensitivity to ethanol gas is about 13.13 pm/ppm when the concentration is between 5.8ppm to 117ppm, and 1.44 pm/ppm when the concentration is between 117 ppm to 204.25 ppm.
{"title":"Experimental Research on Ethanol Gas Sensing Characteristics of Microbottle Resonator Based on Whispering Gallery Mode","authors":"Mingyue Wang, Naisi Zhu, Xusheng Zhang, Ya‐nan Zhang","doi":"10.1109/ICOCN53177.2021.9563827","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563827","url":null,"abstract":"This paper mainly studied the ethanol gas sensing characteristics of silica microbottle resonator coupled with non-adiabatic tapered fiber based on whispering gallery mode (WGM). The main research contents were the bulk refractive index sensitivity of silica microbottle resonator and the sensing characteristics of ethanol gas after being coated with graphene oxide (GO) and polydimethylsiloxane (PDMS), respectively. Experiments reveal that the bulk refractive index sensitivity of the silica microbottle resonator is 21.14941nm/RIU. The sensitivity of WGM silica microbottle resonator coated with GO to ethanol gas is about 1.55 pm/ppm. For the silica microbottle resonator sensor coated with PDMS, the sensitivity to ethanol gas is about 13.13 pm/ppm when the concentration is between 5.8ppm to 117ppm, and 1.44 pm/ppm when the concentration is between 117 ppm to 204.25 ppm.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82100720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, a novel multi-band transmission system based on multi-carrier and adaptive modulation is proposed. The simulation results show that the scheme can effectively improve the performance of system.
提出了一种基于多载波自适应调制的多波段传输系统。仿真结果表明，该方案能有效地提高系统的性能。
{"title":"Research on Multi-band Fiber Transmission System with Multi-carrier and Adaptive Modulation","authors":"Xiaofeng Gao, Feng Tian, Qi Zhang, Qinghua Tian, Yongjun Wang, Leijing Yang, X. Xin","doi":"10.1109/ICOCN53177.2021.9563912","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563912","url":null,"abstract":"In this paper, a novel multi-band transmission system based on multi-carrier and adaptive modulation is proposed. The simulation results show that the scheme can effectively improve the performance of system.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87121887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A reflected microfiber vibration sensor is proposed. The axial strain and vibration characteristics of the proposed sensor are experimentally studied. The results show that the axial strain sensitivity is −3.65pm/µε, the acceleration sensitivity is 0.15214V/g at 35Hz, and the frequency detection range is 30 – 3500Hz. The compact structure, high sensitivity and simple manufacturing method make the microfiber vibration sensor great prospect in mechanical and acoustic vibration field.
{"title":"Dual-mode interference microfiber vibration sensor based on rectangular beam with through hole","authors":"Kaijun Liu, Xianglong Zou, Qi Yang, Junhao Fan, Yufeng Guo, Binbin Luo, Xue Zou, Decao Wu, Sheng-hui Shi","doi":"10.1109/ICOCN53177.2021.9563878","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563878","url":null,"abstract":"A reflected microfiber vibration sensor is proposed. The axial strain and vibration characteristics of the proposed sensor are experimentally studied. The results show that the axial strain sensitivity is −3.65pm/µε, the acceleration sensitivity is 0.15214V/g at 35Hz, and the frequency detection range is 30 – 3500Hz. The compact structure, high sensitivity and simple manufacturing method make the microfiber vibration sensor great prospect in mechanical and acoustic vibration field.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86281373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-23DOI: 10.1109/ICOCN53177.2021.9563815
Qian Yu, K. Ni, Yuwei Zhang, Jiakai Xu
A fiber-optic humidity sensor by cascading two identical chirped fiber bragg grating (CFBG) to form a Fabry-Perot interferometer (FPI) is proposed and experimentally demonstrated, which is coated with carboxymethyl cellulose sodium (CMC-Na) solution as the humidity sensitive film to achieve the effect of measuring humidity. The sensor has a good linear response of light intensity and wavelength to humidity in the range of 20 %RH-80 %RH, with the sensitivity of 0.1043dB/%RH and 0.0177nm/%RH, respectively. It has a good prospect in the field of humidity sensing and can be widely used in actual humidity measurement.
{"title":"A Humidity Sensor Based on CFBG Fabry-Perot Interferometer","authors":"Qian Yu, K. Ni, Yuwei Zhang, Jiakai Xu","doi":"10.1109/ICOCN53177.2021.9563815","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563815","url":null,"abstract":"A fiber-optic humidity sensor by cascading two identical chirped fiber bragg grating (CFBG) to form a Fabry-Perot interferometer (FPI) is proposed and experimentally demonstrated, which is coated with carboxymethyl cellulose sodium (CMC-Na) solution as the humidity sensitive film to achieve the effect of measuring humidity. The sensor has a good linear response of light intensity and wavelength to humidity in the range of 20 %RH-80 %RH, with the sensitivity of 0.1043dB/%RH and 0.0177nm/%RH, respectively. It has a good prospect in the field of humidity sensing and can be widely used in actual humidity measurement.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83984958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-08-23DOI: 10.1109/ICOCN53177.2021.9563813
Huicong Li, Wentao Zhang, Wenzhu Huang, Ruifeng Liu, Li Li
A high-resolution fiber optic Fabry-Perot seismometer for low frequency monitoring is presented. The noise level of the proposed seismometer is 6.74 ng/√Hz, which is better than NHNM within 0.16-50 Hz.
{"title":"High-resolution fiber optic Fabry-Perot seismometer for low frequency monitoring","authors":"Huicong Li, Wentao Zhang, Wenzhu Huang, Ruifeng Liu, Li Li","doi":"10.1109/ICOCN53177.2021.9563813","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563813","url":null,"abstract":"A high-resolution fiber optic Fabry-Perot seismometer for low frequency monitoring is presented. The noise level of the proposed seismometer is 6.74 ng/√Hz, which is better than NHNM within 0.16-50 Hz.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91480625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Underwater visible light communication system (UVLC) based on OFDM modulation was proposed and the constellation diagram as well as transceiver signal waveforms was obtained by simulation to evaluate the system performance.
{"title":"OFDM-based Underwater Visible Light Communication: System construction and performance analysis","authors":"Liwei Yang, Wenlong Xu, Jiacheng Lai, Chen Jin, Furong Zhu","doi":"10.1109/ICOCN53177.2021.9563826","DOIUrl":"https://doi.org/10.1109/ICOCN53177.2021.9563826","url":null,"abstract":"Underwater visible light communication system (UVLC) based on OFDM modulation was proposed and the constellation diagram as well as transceiver signal waveforms was obtained by simulation to evaluate the system performance.","PeriodicalId":6756,"journal":{"name":"2021 19th International Conference on Optical Communications and Networks (ICOCN)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88947450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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