Pub Date : 2022-10-01DOI: 10.1109/MWP54208.2022.9997790
J. Nanni, Giada Saderi, Gaetano Bellanca, G. Bosi, A. Raffo, V. Vadalà, P. Debernardi, J. Polleux, G. Tartarini
Optical transmitters based on Vertical Cavity Surface Emitting Lasers operating in the first optical window (FW-VCSELs) constitute an attractive option to realize Green Radio over Fiber (RoF) systems, due to their low energy consumption. In addition, these devices can take advantage of the widespread existing infrastructures realized on G.652 Standard Single Mode Fibers (SSMF) to develop low-cost RoF connections while remaining transparent for the presently transmitted Fiber-To-The-Home services, which exploit the second and third optical windows. Within this context, the use of simple butt-coupling between FW-VCSELs and SSMF should be a desirable feature, which however is theoretically exposed to possible drawbacks of poor efficiency and two-mode propagation effects. Through a detailed experimental activity referred to commercial high-performance multi- and single-mode FW-VCSELs, it is shown how to optimize their butt-coupling configuration to SSMF reducing the mentioned drawbacks and consider this solution suitable for 5G-and-beyond low-cost Green RoF applications.
{"title":"Attractive Features of Butt Coupling between Single/Multi Mode GaAs-VCSELs and SSMF for Green, Low-cost Radio-over-Fiber Systems","authors":"J. Nanni, Giada Saderi, Gaetano Bellanca, G. Bosi, A. Raffo, V. Vadalà, P. Debernardi, J. Polleux, G. Tartarini","doi":"10.1109/MWP54208.2022.9997790","DOIUrl":"https://doi.org/10.1109/MWP54208.2022.9997790","url":null,"abstract":"Optical transmitters based on Vertical Cavity Surface Emitting Lasers operating in the first optical window (FW-VCSELs) constitute an attractive option to realize Green Radio over Fiber (RoF) systems, due to their low energy consumption. In addition, these devices can take advantage of the widespread existing infrastructures realized on G.652 Standard Single Mode Fibers (SSMF) to develop low-cost RoF connections while remaining transparent for the presently transmitted Fiber-To-The-Home services, which exploit the second and third optical windows. Within this context, the use of simple butt-coupling between FW-VCSELs and SSMF should be a desirable feature, which however is theoretically exposed to possible drawbacks of poor efficiency and two-mode propagation effects. Through a detailed experimental activity referred to commercial high-performance multi- and single-mode FW-VCSELs, it is shown how to optimize their butt-coupling configuration to SSMF reducing the mentioned drawbacks and consider this solution suitable for 5G-and-beyond low-cost Green RoF applications.","PeriodicalId":127318,"journal":{"name":"2022 IEEE International Topical Meeting on Microwave Photonics (MWP)","volume":"10852 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122331474","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 : 2022-10-01DOI: 10.1109/MWP54208.2022.9997709
Yue Zhu, J. Ye, Lian-shan Yan, W. Pan, X. Zou
A digital demodulator based on Fourier layer Transformer network (FTnet) is proposed for radio over fiber (RoF) transmission with intensity-modulation and direct-detection (IM-DD). The FTnet is a new deep learning network, which replaces the self-attention mechanism of the Transformer encoder with a Fourier layer. The FTnet-based digital demodulator can directly recover corresponding bitstreams from the impaired receiving signal, which replaces a series of digital signal processing in the RoF traditional digital demodulator, including down-conversion, matched filter, downsampling, phase offset compensation, equalization, decoding, etc. A 10 GHz 16/64QAM 2 Gsym/s 25 km RoF transmission system is established to verify the proposed method. The experimental results show that the receiving sensitivity for 16QAM and 64QAM systems with the proposed demodulator can be improved by 1 dB and 5 dB respectively compared to traditional digital demodulator with LMS equalizer under a bit error rate limit of 3.8×10−3.
提出了一种基于傅立叶层变压器网络(FTnet)的光纤无线电(RoF)强度调制和直接检测(IM-DD)的数字解调器。FTnet是一种新的深度学习网络，它用傅里叶层取代了Transformer编码器的自关注机制。基于ftnet的数字解调器可以直接从受损的接收信号中恢复相应的比特流，取代了RoF传统数字解调器中的一系列数字信号处理，包括下变频、匹配滤波、下采样、相位偏移补偿、均衡、解码等。建立了一个10 GHz 16/64QAM 2 Gsym/s 25 km RoF传输系统来验证该方法。实验结果表明，在误码率限制为3.8×10−3的情况下，采用该解调器的16QAM和64QAM系统的接收灵敏度比采用LMS均衡器的传统数字解调器分别提高了1 dB和5 dB。
{"title":"FTnet-based Digital Demodulator for Radio over Fiber Transmission","authors":"Yue Zhu, J. Ye, Lian-shan Yan, W. Pan, X. Zou","doi":"10.1109/MWP54208.2022.9997709","DOIUrl":"https://doi.org/10.1109/MWP54208.2022.9997709","url":null,"abstract":"A digital demodulator based on Fourier layer Transformer network (FTnet) is proposed for radio over fiber (RoF) transmission with intensity-modulation and direct-detection (IM-DD). The FTnet is a new deep learning network, which replaces the self-attention mechanism of the Transformer encoder with a Fourier layer. The FTnet-based digital demodulator can directly recover corresponding bitstreams from the impaired receiving signal, which replaces a series of digital signal processing in the RoF traditional digital demodulator, including down-conversion, matched filter, downsampling, phase offset compensation, equalization, decoding, etc. A 10 GHz 16/64QAM 2 Gsym/s 25 km RoF transmission system is established to verify the proposed method. The experimental results show that the receiving sensitivity for 16QAM and 64QAM systems with the proposed demodulator can be improved by 1 dB and 5 dB respectively compared to traditional digital demodulator with LMS equalizer under a bit error rate limit of 3.8×10−3.","PeriodicalId":127318,"journal":{"name":"2022 IEEE International Topical Meeting on Microwave Photonics (MWP)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131954231","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 : 2022-10-01DOI: 10.1109/MWP54208.2022.9997591
Ileana-Cristina Benea-Chelmus
We discuss electro-optic modulators from flat optics that change the intensity of light at speeds up to the microwaves. We employ a hybrid platform that combines silicon-silica nanoresonators with an electro-optic organic coating that maximizes the interaction of the optical field with microwaves applied via gold electrodes patterned around single rows of resonators. By employing electric field poling of the coating, we engineer its nonlinearity in-device. The resulting in-plane periodically poled layer matches the polarity of the applied microwave field, thereby leading to a maximized electro-optic effect.
{"title":"Ultrathin GHz-speed free-space electro-optic modulators","authors":"Ileana-Cristina Benea-Chelmus","doi":"10.1109/MWP54208.2022.9997591","DOIUrl":"https://doi.org/10.1109/MWP54208.2022.9997591","url":null,"abstract":"We discuss electro-optic modulators from flat optics that change the intensity of light at speeds up to the microwaves. We employ a hybrid platform that combines silicon-silica nanoresonators with an electro-optic organic coating that maximizes the interaction of the optical field with microwaves applied via gold electrodes patterned around single rows of resonators. By employing electric field poling of the coating, we engineer its nonlinearity in-device. The resulting in-plane periodically poled layer matches the polarity of the applied microwave field, thereby leading to a maximized electro-optic effect.","PeriodicalId":127318,"journal":{"name":"2022 IEEE International Topical Meeting on Microwave Photonics (MWP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130928725","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 : 2022-10-01DOI: 10.1109/MWP54208.2022.9997635
Xiao Yu, J. Ye, Lian-shan Yan, X. Zou, W. Pan
An adaptive multipath optical self-interference cancellation scheme based on deep reinforcement learning is proposed and investigated. The simulation results demonstrate that the proposed scheme can adaptively achieve multipath self-interference cancellation using deep neural networks, where the multipath SI is successfully eliminated to the noise floor and a cancellation depth of 33.4 dB over 2 GHz bandwidth at a center frequency of 2 GHz is achieved within 5 steps. The proposed scheme may provide a promising solution for future in-band full-duplex systems.
{"title":"Adaptive multipath optical self-interference cancellation based on deep reinforcement learning","authors":"Xiao Yu, J. Ye, Lian-shan Yan, X. Zou, W. Pan","doi":"10.1109/MWP54208.2022.9997635","DOIUrl":"https://doi.org/10.1109/MWP54208.2022.9997635","url":null,"abstract":"An adaptive multipath optical self-interference cancellation scheme based on deep reinforcement learning is proposed and investigated. The simulation results demonstrate that the proposed scheme can adaptively achieve multipath self-interference cancellation using deep neural networks, where the multipath SI is successfully eliminated to the noise floor and a cancellation depth of 33.4 dB over 2 GHz bandwidth at a center frequency of 2 GHz is achieved within 5 steps. The proposed scheme may provide a promising solution for future in-band full-duplex systems.","PeriodicalId":127318,"journal":{"name":"2022 IEEE International Topical Meeting on Microwave Photonics (MWP)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116488289","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 : 2022-10-01DOI: 10.1109/MWP54208.2022.9997713
Zu-Kai Weng, P. Dat, A. Kanno, T. Kawanishi
We experimentally implemented and discussed the quasi 2-bit delta-sigma modulated 32-QAM OFDM based DRoF link in detail. Optically constructing the delta-sigma modulated 2-bit QAM-OFDM data mitigated the impact of nonlinearity in optical links. After optimization, the quasi 2-bit delta-sigma modulated 32-QAM OFDM was successfully transmitted over 15-km SMF with a raw data rate of 2.5 Gbit/s at the lowest receiving power of −15.10 dBm. The proposed DRoF link structure boosted the robust anti-nonlinearity and cost-effective RRHs, which was appropriate for the beyond 5G applications.
实验实现并详细讨论了基于准2位δ - σ调制32-QAM OFDM的DRoF链路。通过光学构造delta-sigma调制的2位QAM-OFDM数据，减轻了光链路中非线性的影响。优化后，准2位delta-sigma调制的32-QAM OFDM在- 15.10 dBm的最低接收功率下，以2.5 Gbit/s的原始数据速率成功地传输了15 km SMF。提出的DRoF链路结构增强了抗非线性的鲁棒性和低成本的RRHs，适用于5G以上的应用。
{"title":"Quasi 2-bit 32-QAM OFDM based Digital RoF Link by Delta-sigma Modulation at 2.5 Gbit/s","authors":"Zu-Kai Weng, P. Dat, A. Kanno, T. Kawanishi","doi":"10.1109/MWP54208.2022.9997713","DOIUrl":"https://doi.org/10.1109/MWP54208.2022.9997713","url":null,"abstract":"We experimentally implemented and discussed the quasi 2-bit delta-sigma modulated 32-QAM OFDM based DRoF link in detail. Optically constructing the delta-sigma modulated 2-bit QAM-OFDM data mitigated the impact of nonlinearity in optical links. After optimization, the quasi 2-bit delta-sigma modulated 32-QAM OFDM was successfully transmitted over 15-km SMF with a raw data rate of 2.5 Gbit/s at the lowest receiving power of −15.10 dBm. The proposed DRoF link structure boosted the robust anti-nonlinearity and cost-effective RRHs, which was appropriate for the beyond 5G applications.","PeriodicalId":127318,"journal":{"name":"2022 IEEE International Topical Meeting on Microwave Photonics (MWP)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123296490","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 : 2022-10-01DOI: 10.1109/MWP54208.2022.9997743
S. Chew, X. Yi, L. Nguyen
The advances in reconfigurable microwave photonic (MWP) integrated devices calls for the discovery of materials that can offer the same reconfigurable properties. In this paper, we explore the use of indium tin oxide (ITO), which belongs to the family of transparent conductive oxides (TCO), for the first demonstration of tunable on-chip MWP devices. The ability to modify the optical and electronic properties of ITO makes this a novel material with unlimited possibilities to outperform current tunability mechanism. In this paper, we demonstrate the use of the quasi-metallic feature of ITO as an active microheater control for realizing a tunable MWP phase shifter. Experimental results show the successful tuning of the RF phase shifts from 0 – 322°, almost across the full phase tuning range of the single ring, throughout a 20 GHz span by driving the ITO microheaters with a biased voltage tuned from 1.05 V to 5.25 V.
{"title":"Microwave photonic phase shifter based on the integration of ITO-enabled microheaters","authors":"S. Chew, X. Yi, L. Nguyen","doi":"10.1109/MWP54208.2022.9997743","DOIUrl":"https://doi.org/10.1109/MWP54208.2022.9997743","url":null,"abstract":"The advances in reconfigurable microwave photonic (MWP) integrated devices calls for the discovery of materials that can offer the same reconfigurable properties. In this paper, we explore the use of indium tin oxide (ITO), which belongs to the family of transparent conductive oxides (TCO), for the first demonstration of tunable on-chip MWP devices. The ability to modify the optical and electronic properties of ITO makes this a novel material with unlimited possibilities to outperform current tunability mechanism. In this paper, we demonstrate the use of the quasi-metallic feature of ITO as an active microheater control for realizing a tunable MWP phase shifter. Experimental results show the successful tuning of the RF phase shifts from 0 – 322°, almost across the full phase tuning range of the single ring, throughout a 20 GHz span by driving the ITO microheaters with a biased voltage tuned from 1.05 V to 5.25 V.","PeriodicalId":127318,"journal":{"name":"2022 IEEE International Topical Meeting on Microwave Photonics (MWP)","volume":"18 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128034905","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 : 2022-10-01DOI: 10.1109/MWP54208.2022.9997605
Xiaoyi Tian, Liwei Li, L. Nguyen, R. Minasian, X. Yi
In this paper, a new microwave photonic (MWP) sensing scheme, which is based on interrogating microresonator sensors with fast speed and improved resolution by adopting a broadband linear frequency-modulated pulse (LFMP) in the MWP sideband processing, is presented. The LFMP modulates the interrogation light, creating the optical sideband that sweeps through the resonance rapidly. By using the optimized DC bias point, the resonance spectral dip with arbitrary characteristics can be transformed into the zero point in the temporal envelope of the transmitted LFMP, hence providing improved interrogation resolution of the resonance shifts caused by environmental changes. The proposed scheme was implemented with a microdisk resonance for temperature sensing, where up to 20-fold interrogation resolution improvement was demonstrated by tuning the DC bias voltage to the optimum. The interrogation speed is 500 kHz, which can be further improved by using a shorter repetition period and pulse width.
{"title":"Microwave Photonic Sensor Based on Optical Sideband Processing with Linear Frequency-modulated Pulse","authors":"Xiaoyi Tian, Liwei Li, L. Nguyen, R. Minasian, X. Yi","doi":"10.1109/MWP54208.2022.9997605","DOIUrl":"https://doi.org/10.1109/MWP54208.2022.9997605","url":null,"abstract":"In this paper, a new microwave photonic (MWP) sensing scheme, which is based on interrogating microresonator sensors with fast speed and improved resolution by adopting a broadband linear frequency-modulated pulse (LFMP) in the MWP sideband processing, is presented. The LFMP modulates the interrogation light, creating the optical sideband that sweeps through the resonance rapidly. By using the optimized DC bias point, the resonance spectral dip with arbitrary characteristics can be transformed into the zero point in the temporal envelope of the transmitted LFMP, hence providing improved interrogation resolution of the resonance shifts caused by environmental changes. The proposed scheme was implemented with a microdisk resonance for temperature sensing, where up to 20-fold interrogation resolution improvement was demonstrated by tuning the DC bias voltage to the optimum. The interrogation speed is 500 kHz, which can be further improved by using a shorter repetition period and pulse width.","PeriodicalId":127318,"journal":{"name":"2022 IEEE International Topical Meeting on Microwave Photonics (MWP)","volume":"167 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116695235","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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