Pub Date : 2017-07-31DOI: 10.1109/CLEOPR.2017.8119015
Lian-Kuan Chen, Yang Hong
In this paper, we will review our recent works on advanced signal processing for VLC, particularly the orthogonal circulant matrix transform (OCT) precoding that requires no channel state information. The benefits of OCT precoding in SISO-, MIMO-VLC, and the inherent reason of performance improvement, will be discussed. In addition, comparisons of the existing solutions to combat the limited modulation bandwidth of VLC systems will be presented. Potential applications of the OCT precoding in other systems will be given.
{"title":"Channel-independent signal processing for high-speed VLC systems","authors":"Lian-Kuan Chen, Yang Hong","doi":"10.1109/CLEOPR.2017.8119015","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8119015","url":null,"abstract":"In this paper, we will review our recent works on advanced signal processing for VLC, particularly the orthogonal circulant matrix transform (OCT) precoding that requires no channel state information. The benefits of OCT precoding in SISO-, MIMO-VLC, and the inherent reason of performance improvement, will be discussed. In addition, comparisons of the existing solutions to combat the limited modulation bandwidth of VLC systems will be presented. Potential applications of the OCT precoding in other systems will be given.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"47 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90377485","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}
Grating coupler, as one of the key components can provide convenient on-wafer testing and packaging for integrated photonics. Silicon nitride (SiNx) grating coupler suffers from lower efficiency due to the relative low material refractive index. The efficiency of SiNx grating coupler can be improved by using high reflectivity silicon grating reflectors underneath. However, such silicon grating reflector requires several fabrication steps, including lithography, etching, high precision alignment (HPA), and chemical mechanical polishing (CMP). In this work, we demonstrate an easy-to-fabricate SiNx grating coupler only requiring a single patterning step without the need of HPA and CMP. A coupling coefficient of −2.5 dB and 1-dB-bandwidth of 65 nm have been experimentally measured.
{"title":"Fabrication-friendly high-efficiency silicon nitride grating coupler","authors":"Pengfei Xu, Yanfeng Zhang, Zengkai Shao, Lin Liu, Lidan Zhou, Chunchuan Yang, Yujie Chen, Siyuan Yu","doi":"10.1109/CLEOPR.2017.8118727","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118727","url":null,"abstract":"Grating coupler, as one of the key components can provide convenient on-wafer testing and packaging for integrated photonics. Silicon nitride (SiNx) grating coupler suffers from lower efficiency due to the relative low material refractive index. The efficiency of SiNx grating coupler can be improved by using high reflectivity silicon grating reflectors underneath. However, such silicon grating reflector requires several fabrication steps, including lithography, etching, high precision alignment (HPA), and chemical mechanical polishing (CMP). In this work, we demonstrate an easy-to-fabricate SiNx grating coupler only requiring a single patterning step without the need of HPA and CMP. A coupling coefficient of −2.5 dB and 1-dB-bandwidth of 65 nm have been experimentally measured.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"79 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83796188","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118937
Hanyu Zhang, Linjie Zhou, Liangjun Lu, Z. Guo, Jian Xu, Xuecheng Fu, Jianping Chen, B. Rahman
We report a novel silicon MZI switch activated by the phase change of a sub-micrometer-size Ge2Sb2Te5 (GST) thin film. The phase change of GST is triggered by electrical pulses, leading to two “self-holding” switching states. Extinction ratio change of 5-dB is measured from the MZI spectrum.
{"title":"Electro-optical switch using Ge2Sb2Te5 phase-change material in a silicon MZI structure","authors":"Hanyu Zhang, Linjie Zhou, Liangjun Lu, Z. Guo, Jian Xu, Xuecheng Fu, Jianping Chen, B. Rahman","doi":"10.1109/CLEOPR.2017.8118937","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118937","url":null,"abstract":"We report a novel silicon MZI switch activated by the phase change of a sub-micrometer-size Ge<inf>2</inf>Sb<inf>2</inf>Te<inf>5</inf> (GST) thin film. The phase change of GST is triggered by electrical pulses, leading to two “self-holding” switching states. Extinction ratio change of 5-dB is measured from the MZI spectrum.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"21 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84659228","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8119069
H. Ibrahim, M. Ahmed, F. Koyama
We present the modeling of high speed large signal modulation of transverse-coupled cavity (TCC) VCSELs. Clear eye opening can be seen up to 60 Gbps and the frequency chirp is reduced by a factor of two thanks to photon-photon resonance.
{"title":"Large signal modultion analysis of high-speed transverse coupled cavity VCSELs","authors":"H. Ibrahim, M. Ahmed, F. Koyama","doi":"10.1109/CLEOPR.2017.8119069","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8119069","url":null,"abstract":"We present the modeling of high speed large signal modulation of transverse-coupled cavity (TCC) VCSELs. Clear eye opening can be seen up to 60 Gbps and the frequency chirp is reduced by a factor of two thanks to photon-photon resonance.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"48 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83138021","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8119047
Zhang Sheng, W. Zhong, Duan Pengfei, Chen Chen, Dehao Wu
We propose an improved phase difference of arrival (PDOA) scheme for indoor visible light positioning (VLP), which avoids using local oscillators (LOs) at the receiver and synchronization between the transmitters and the receiver. The proposed scheme can considerably reduce system complexity, relax the frequency allocation constraints, and improve the positioning accuracy.
{"title":"PDOA based indoor visible light positioning system without local oscillators in receiver","authors":"Zhang Sheng, W. Zhong, Duan Pengfei, Chen Chen, Dehao Wu","doi":"10.1109/CLEOPR.2017.8119047","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8119047","url":null,"abstract":"We propose an improved phase difference of arrival (PDOA) scheme for indoor visible light positioning (VLP), which avoids using local oscillators (LOs) at the receiver and synchronization between the transmitters and the receiver. The proposed scheme can considerably reduce system complexity, relax the frequency allocation constraints, and improve the positioning accuracy.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"26 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83897645","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118898
Xiaoxi Jin, Biao Sun, J. Ji, Jiaqi Luo, P. Zhou, Qijie Wang, Xia Yu
We propose a high-efficiency pulsed Tm-doped fiber amplifier based on resonant pumping. A continuous-wave fiber laser at 1940 nm was employed as pump laser, and a home-made all-fiber pulsed laser at 1975 nm with the repetition rate of 250 MHz served as signal laser. In the simulation, the slope efficiency of the Tm-doped fiber amplifier was ∼88%, which could be further improved by fiber length optimization and/or applying higher signal power.
{"title":"High-efficiency pulsed Tm-doped fiber amplifier","authors":"Xiaoxi Jin, Biao Sun, J. Ji, Jiaqi Luo, P. Zhou, Qijie Wang, Xia Yu","doi":"10.1109/CLEOPR.2017.8118898","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118898","url":null,"abstract":"We propose a high-efficiency pulsed Tm-doped fiber amplifier based on resonant pumping. A continuous-wave fiber laser at 1940 nm was employed as pump laser, and a home-made all-fiber pulsed laser at 1975 nm with the repetition rate of 250 MHz served as signal laser. In the simulation, the slope efficiency of the Tm-doped fiber amplifier was ∼88%, which could be further improved by fiber length optimization and/or applying higher signal power.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"16 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88127003","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8119016
Zecen Zhang, G. Ng, H. Qiu, Xin Guo, M. Rouifed, Chongyang Liu, Hong Wang
A dual-band optical filter based on a single microring resonator embedded with nanoholes is theoretically and experimentally demonstrated for the first time. A numerical model based on transfer matrix method is utilized to simulate the performance of this device. The coupling between the microring resonator and the Fabry-Pérot resonator formed by nanoholes gives rise to the dual-band optical filtering spectrum. In our experiment, a single microring resonator embedded with nanoholes was fabricated on a commercial 220-nm-thick-top-silicon silicon-on-insulator (SOI) platform. Good performance was achieved with measured extinction ratio of 9 dB, insertion loss of lower than 1 dB, and quality factor of 11900. Both experimental and simulation results are in good agreement.
{"title":"Dual-band optical filter based on a single microring resonator embedded with nanoholes","authors":"Zecen Zhang, G. Ng, H. Qiu, Xin Guo, M. Rouifed, Chongyang Liu, Hong Wang","doi":"10.1109/CLEOPR.2017.8119016","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8119016","url":null,"abstract":"A dual-band optical filter based on a single microring resonator embedded with nanoholes is theoretically and experimentally demonstrated for the first time. A numerical model based on transfer matrix method is utilized to simulate the performance of this device. The coupling between the microring resonator and the Fabry-Pérot resonator formed by nanoholes gives rise to the dual-band optical filtering spectrum. In our experiment, a single microring resonator embedded with nanoholes was fabricated on a commercial 220-nm-thick-top-silicon silicon-on-insulator (SOI) platform. Good performance was achieved with measured extinction ratio of 9 dB, insertion loss of lower than 1 dB, and quality factor of 11900. Both experimental and simulation results are in good agreement.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"1 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79460921","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}
Metasurfaces are well known as a single-layer subwavelength structure with superior capability in wavefront shaping, and cascaded metasurfaces with multi-layer structures resulting in compact optical devices will further improve the performance and also bring in new functionalities, such as image correction, optical transformation and processing. However, in order to realize such cascaded metasurfaces, a key issue is to achieve high precision alignment of the structures in each layer usually with large distance in between. Here we propose and experimentally confirm two schemes based on optical alignment and electron-beam alignment respectively to align the frontside and backside of a wafer in order to realize cascaded metasurfaces on these two sides. Except for cascaded metasurface structures, these approaches may also have a wide range of applications in need of other cascaded structures for specific functionality.
{"title":"Cascaded metasurface structures","authors":"Yuanhui Wen, Jiangbo Zhu, Yujie Chen, Lidan Zhou, Lin Liu, Chunchuan Yang, Yanfeng Zhang, Siyuan Yu","doi":"10.1109/CLEOPR.2017.8118869","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118869","url":null,"abstract":"Metasurfaces are well known as a single-layer subwavelength structure with superior capability in wavefront shaping, and cascaded metasurfaces with multi-layer structures resulting in compact optical devices will further improve the performance and also bring in new functionalities, such as image correction, optical transformation and processing. However, in order to realize such cascaded metasurfaces, a key issue is to achieve high precision alignment of the structures in each layer usually with large distance in between. Here we propose and experimentally confirm two schemes based on optical alignment and electron-beam alignment respectively to align the frontside and backside of a wafer in order to realize cascaded metasurfaces on these two sides. Except for cascaded metasurface structures, these approaches may also have a wide range of applications in need of other cascaded structures for specific functionality.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"1 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80200105","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8118969
Wei Zhang, Fan Ai, Yang Xiang, Jingyi Wang, Deming Liu, Qizhen Sun
High sensitive strain sensor of hundred ηε magnitude realized by combining coherent OTDR detection with microstructures based fiber is proposed and demonstrated, promising long distance fully-distributed strain sensing with no dead sensing zone.
{"title":"Highly sensitive strain sensor based on fiber microstructures associated with coherent detection","authors":"Wei Zhang, Fan Ai, Yang Xiang, Jingyi Wang, Deming Liu, Qizhen Sun","doi":"10.1109/CLEOPR.2017.8118969","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8118969","url":null,"abstract":"High sensitive strain sensor of hundred ηε magnitude realized by combining coherent OTDR detection with microstructures based fiber is proposed and demonstrated, promising long distance fully-distributed strain sensing with no dead sensing zone.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"80 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87431573","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 : 2017-07-31DOI: 10.1109/CLEOPR.2017.8119001
M. Rouifed, C. Littlejohns, G. X. Tina, Jia Xu Brian Sia, H. Qiu, J. S. Penadés, M. Nedeljkovic, Zecen Zhang, Chongyong Liu, D. Thomson, G. Mashanovich, G. Reed, Hong Wang
In this paper, we present our recent results on the development of passive devices for short-wave infrared and MIR applications. SOI platform is used and several devices, like waveguides, MMIs, spirals, unbalanced MZI, are designed, fabricated and characterized at the wavelengths of 2μm and 3.8μm.
{"title":"Silicon photonic devices for the mid-infrared","authors":"M. Rouifed, C. Littlejohns, G. X. Tina, Jia Xu Brian Sia, H. Qiu, J. S. Penadés, M. Nedeljkovic, Zecen Zhang, Chongyong Liu, D. Thomson, G. Mashanovich, G. Reed, Hong Wang","doi":"10.1109/CLEOPR.2017.8119001","DOIUrl":"https://doi.org/10.1109/CLEOPR.2017.8119001","url":null,"abstract":"In this paper, we present our recent results on the development of passive devices for short-wave infrared and MIR applications. SOI platform is used and several devices, like waveguides, MMIs, spirals, unbalanced MZI, are designed, fabricated and characterized at the wavelengths of 2μm and 3.8μm.","PeriodicalId":6655,"journal":{"name":"2017 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)","volume":"41 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85878910","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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