Pub Date : 2020-10-04DOI: 10.1109/OECC48412.2020.9273586
Xin Qin, Pengfei Wang, Chuanchuan Yang, Fan Zhang, Xinyue Wang, Ziyu Wang
RNN-based joint equalization and decoding methods are proposed for data center with TCM signals. Numerical results show compared with traditional DSP algorithms, our method improves power sensitivity by 2.2dB@BER=3.8×10-3 with 96% reduced complexity.
{"title":"A Low-Complexity Recurrent Neural Network Based Joint Equalization and Decoding Method for Trellis Coded Modulation Link in Data Center","authors":"Xin Qin, Pengfei Wang, Chuanchuan Yang, Fan Zhang, Xinyue Wang, Ziyu Wang","doi":"10.1109/OECC48412.2020.9273586","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273586","url":null,"abstract":"RNN-based joint equalization and decoding methods are proposed for data center with TCM signals. Numerical results show compared with traditional DSP algorithms, our method improves power sensitivity by 2.2dB@BER=3.8×10-3 with 96% reduced complexity.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128997913","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 : 2020-10-04DOI: 10.1109/OECC48412.2020.9273712
Yen-Chung Wang, Po-Hsun Wu, Guo-Hao Lu, P. Cheng, Jing-Feng Weng, C. Weng
In the non-contact optical measurement techniques, the depth of field limits the range of the measurement. If the step height sample is out of the depth of field, and it will cause the measurement to fail. In this study, the proposed integration framework integrates the movement of PZT (piezoelectric transducer) stage and the algorithm of the multiple-height image fusion. It can precisely define the height discontinuity of the step height sample which is out of the depth of field. In detail, the lead zirconate titanate actuator, namely PZT actuator, moves a fixed distance with 1 μm. And then, the camera captures one sheet of the 2D image. The working distance of PZT is 800 μm. After repeating the cycle of PZT and the camera with 800 times, the 800 sheets of the 2D image are obtained. The algorithm of the multiple-height image fusion enables the 800 sheets of the 2D image to become the one of 3D reconstruction image with the noise. Finally, the filtering algorithm is used to remove the noise in the 3D reconstruction image. In the experiment system with the depth of field 100 μm, the accuracy of the step height sample with 200 μm is about 1 μm (i.e. 0.5%).
{"title":"Image reconstruction based on tuning depth focus by PZT","authors":"Yen-Chung Wang, Po-Hsun Wu, Guo-Hao Lu, P. Cheng, Jing-Feng Weng, C. Weng","doi":"10.1109/OECC48412.2020.9273712","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273712","url":null,"abstract":"In the non-contact optical measurement techniques, the depth of field limits the range of the measurement. If the step height sample is out of the depth of field, and it will cause the measurement to fail. In this study, the proposed integration framework integrates the movement of PZT (piezoelectric transducer) stage and the algorithm of the multiple-height image fusion. It can precisely define the height discontinuity of the step height sample which is out of the depth of field. In detail, the lead zirconate titanate actuator, namely PZT actuator, moves a fixed distance with 1 μm. And then, the camera captures one sheet of the 2D image. The working distance of PZT is 800 μm. After repeating the cycle of PZT and the camera with 800 times, the 800 sheets of the 2D image are obtained. The algorithm of the multiple-height image fusion enables the 800 sheets of the 2D image to become the one of 3D reconstruction image with the noise. Finally, the filtering algorithm is used to remove the noise in the 3D reconstruction image. In the experiment system with the depth of field 100 μm, the accuracy of the step height sample with 200 μm is about 1 μm (i.e. 0.5%).","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130036495","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 : 2020-10-04DOI: 10.1109/OECC48412.2020.9273537
Eiji Honda, Y. Mori, H. Hasegawa, Ken-ichi Sato
We evaluate the feasibility of an optical circuit switch that suits SDM-based intra-datacenter networks. Simulations with 100-Gbps DP-QPSK signals and 200-Gbps DP-16QAM signals clarify the maximum switch throughput attainable with feasible hardware requirements.
{"title":"Evaluation of Optical Circuit Switches for SDMBased Intra-Datacenter Networks","authors":"Eiji Honda, Y. Mori, H. Hasegawa, Ken-ichi Sato","doi":"10.1109/OECC48412.2020.9273537","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273537","url":null,"abstract":"We evaluate the feasibility of an optical circuit switch that suits SDM-based intra-datacenter networks. Simulations with 100-Gbps DP-QPSK signals and 200-Gbps DP-16QAM signals clarify the maximum switch throughput attainable with feasible hardware requirements.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125575673","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 : 2020-10-04DOI: 10.1109/OECC48412.2020.9273651
Chien-Chung Lin, Chien-Ying Huang, Kai-Ning Ku, K. Chou, T. Chen, Po-Chih Chang, Yu-Fang Chen, Chen-Yu Lin, Chung-Chih Wang, Chi-Sen Lee, Chih-Hsiang Hsu, Shang-Chun Chen
In this paper, we demonstrated the hybrid silicon photonics platform developed in ITRI. The functions of this platform include full-wafer high speed photonic measurement, active and passive device fabrication, and the photonic packaging technology.
{"title":"A Hybrid Integration Platform of Silicon Photonics","authors":"Chien-Chung Lin, Chien-Ying Huang, Kai-Ning Ku, K. Chou, T. Chen, Po-Chih Chang, Yu-Fang Chen, Chen-Yu Lin, Chung-Chih Wang, Chi-Sen Lee, Chih-Hsiang Hsu, Shang-Chun Chen","doi":"10.1109/OECC48412.2020.9273651","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273651","url":null,"abstract":"In this paper, we demonstrated the hybrid silicon photonics platform developed in ITRI. The functions of this platform include full-wafer high speed photonic measurement, active and passive device fabrication, and the photonic packaging technology.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127224093","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 study reports the use of spectral modulation to solve photocurrent mismatch between sub-cells of triple-junction GaAs solar cell as well as to increase conversion efficiency by using a specific thickness of single antireflection TiO2-layer.
{"title":"Current Mismatch Improving of Triple Junction GaAs Solar Cell Using Antireflective Spectral Modulation","authors":"Xing‐Yu Chen, W. Ho, Jheng-Jie Liu, His-Wen Hsu, Wei-chih Chiu, Yau–Huei Chen","doi":"10.1109/OECC48412.2020.9273618","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273618","url":null,"abstract":"This study reports the use of spectral modulation to solve photocurrent mismatch between sub-cells of triple-junction GaAs solar cell as well as to increase conversion efficiency by using a specific thickness of single antireflection TiO2-layer.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127401981","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 : 2020-10-04DOI: 10.1109/OECC48412.2020.9273727
Y. Hasegawa, Masaki Sato, Morihiko Ota, H. Noguchi
We show experimental results that recent TCPs enables 0.5 dB of link-budget extension from the zero-margin point for error-free. Our results designate that optical communication systems may have low-margin strategies with relaxed BER constraints.
{"title":"Low-Margin Optical-Link Setting for Error-Tolerant TCPs","authors":"Y. Hasegawa, Masaki Sato, Morihiko Ota, H. Noguchi","doi":"10.1109/OECC48412.2020.9273727","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273727","url":null,"abstract":"We show experimental results that recent TCPs enables 0.5 dB of link-budget extension from the zero-margin point for error-free. Our results designate that optical communication systems may have low-margin strategies with relaxed BER constraints.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114290069","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 : 2020-10-04DOI: 10.1109/OECC48412.2020.9273551
M. Soares, Koki Nakaya, K. Fukushima, A. Wada, S. Tanaka, F. Ito
We have investigated optical frequency-shift sensitivity of the transmittance channeled spectrum of cascaded-chirped long period fiber gratings (C-CLPGs) to an applied strain from the viewpoint of the sensor use. In the experiment, eight different kinds of C-CLPGs have been fabricated by changing the cascaded distance for two types of CLPGs and the strain-induced spectral shifts are measured by use of a cross-correlation technique which provides highly precise determination of the spectral shift. As a result, it is confirmed that the higher frequency-shift sensitivities of the C-CLPGs to the strain obtain with the higher order of cladding mode.
{"title":"Strain Characteristics of Cascaded-Chirped Long Period Fiber Gratings Depending on Order of Cladding Mode","authors":"M. Soares, Koki Nakaya, K. Fukushima, A. Wada, S. Tanaka, F. Ito","doi":"10.1109/OECC48412.2020.9273551","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273551","url":null,"abstract":"We have investigated optical frequency-shift sensitivity of the transmittance channeled spectrum of cascaded-chirped long period fiber gratings (C-CLPGs) to an applied strain from the viewpoint of the sensor use. In the experiment, eight different kinds of C-CLPGs have been fabricated by changing the cascaded distance for two types of CLPGs and the strain-induced spectral shifts are measured by use of a cross-correlation technique which provides highly precise determination of the spectral shift. As a result, it is confirmed that the higher frequency-shift sensitivities of the C-CLPGs to the strain obtain with the higher order of cladding mode.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126361380","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 : 2020-10-04DOI: 10.1109/OECC48412.2020.9273594
Kai-Ning Ku, Po-Chih Chang, Chung-Chih Wang, Chen-Yu Lin, Chih-Hsiang Hsu, T. Chen, Chien-Ying Huang, Chi-Sen Lee, Yu-Fang Chen, K. Chou, Shang-Chun Chen, Ming-Chang M. Lee, Chien-Chung Lin, M. Chu, Chih-I Wu
This research presents the design and characterization of the traveling wave Mach Zehnder modulator loaded L-shaped PN junction phase shifter at 72.8 Gbps data-rate. We propose a new structure of phase shifter with low series resistance meanwhile maintaining the FOM with low VπL (0.9 V-cm) and optical absorption.
{"title":"High Speed Mach Zehnder Modulator with Low Series Resistance Phase Shifter Loaded in Traveling Wave Electrode","authors":"Kai-Ning Ku, Po-Chih Chang, Chung-Chih Wang, Chen-Yu Lin, Chih-Hsiang Hsu, T. Chen, Chien-Ying Huang, Chi-Sen Lee, Yu-Fang Chen, K. Chou, Shang-Chun Chen, Ming-Chang M. Lee, Chien-Chung Lin, M. Chu, Chih-I Wu","doi":"10.1109/OECC48412.2020.9273594","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273594","url":null,"abstract":"This research presents the design and characterization of the traveling wave Mach Zehnder modulator loaded L-shaped PN junction phase shifter at 72.8 Gbps data-rate. We propose a new structure of phase shifter with low series resistance meanwhile maintaining the FOM with low VπL (0.9 V-cm) and optical absorption.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133062097","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 : 2020-10-04DOI: 10.1109/OECC48412.2020.9273522
Yuri Niiya, T. Kuboki, K. Kato
In order to realize a high-speed wavelength switching of the TDA-DFB laser at a wide switching width, we developed an accurate control model accounting for the laser nonlinearity. We applied our nonlinear model to 400-GHz-wide and 600-GHz-wide switching and achieved a switching time within 50 ns.
{"title":"Wide-Range Wavelength Switching at TDA-DFB Laser by Nonlinear Model","authors":"Yuri Niiya, T. Kuboki, K. Kato","doi":"10.1109/OECC48412.2020.9273522","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273522","url":null,"abstract":"In order to realize a high-speed wavelength switching of the TDA-DFB laser at a wide switching width, we developed an accurate control model accounting for the laser nonlinearity. We applied our nonlinear model to 400-GHz-wide and 600-GHz-wide switching and achieved a switching time within 50 ns.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"27 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114001806","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 : 2020-10-04DOI: 10.1109/OECC48412.2020.9273593
Ryoto Nakagawa, Moriya Nakamura
We investigated the use of digital to analog converters (DACs) instead of the electrical analog Hilbert transformers in optical twin-SSB systems. We clarified the required resolution and sampling frequency of the DACs.
{"title":"Performance Evaluation of Twin-SSB Modulation Using Digital-to-Analogue Converters","authors":"Ryoto Nakagawa, Moriya Nakamura","doi":"10.1109/OECC48412.2020.9273593","DOIUrl":"https://doi.org/10.1109/OECC48412.2020.9273593","url":null,"abstract":"We investigated the use of digital to analog converters (DACs) instead of the electrical analog Hilbert transformers in optical twin-SSB systems. We clarified the required resolution and sampling frequency of the DACs.","PeriodicalId":433309,"journal":{"name":"2020 Opto-Electronics and Communications Conference (OECC)","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123076434","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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