Pub Date : 2022-01-01DOI: 10.1587/elex.19.20220394
K. Fukushima, M. Okano, A. Wada, S. Tanaka, Fumihiko Ito
In this work, we have constructed an Erbium-doped fiber sigma laser (EDFσL) using a double-pass cascaded-chirped long-period fiber grating (C-CLPG) from the viewpoint of the sensor applications. The double-pass C-CLPG is composed of a C-CLPG and a Faraday rotator mirror (FRM) and works as a comb-like wavelength selection element as well as a sensor section in the sigma-branch of the laser cavity. Further, due to the FRM reflection scheme, the double-pass C- CLPG compensates for birefringence variation in the sigma-branch during the sensing. In the experiment, the sensor section near the C- CLPG is intentionally deformed to induce birefringence variation assuming the external disturbances; nevertheless, it is confirmed that the double-pass C-CLPG provides stable polarization states. Then, under the birefringence variation, it is demonstrated that the proposed EDFσL can achieve a stable oscillation and resultant precise measurements in contrast to the simple EDF ring laser using the single- pass C-CLPG. In addition, for the demonstration of the sensor with external force to the fiber, the oscillation wavelength of EDFσL in response to axial strain is investigated, and a linear response with sensitivity ~0.32 pm/µε is obtained.
{"title":"EDF sigma laser using double-pass cascaded-chirped long-period fiber grating with birefringence compensation effect and its application for strain measurement","authors":"K. Fukushima, M. Okano, A. Wada, S. Tanaka, Fumihiko Ito","doi":"10.1587/elex.19.20220394","DOIUrl":"https://doi.org/10.1587/elex.19.20220394","url":null,"abstract":"In this work, we have constructed an Erbium-doped fiber sigma laser (EDFσL) using a double-pass cascaded-chirped long-period fiber grating (C-CLPG) from the viewpoint of the sensor applications. The double-pass C-CLPG is composed of a C-CLPG and a Faraday rotator mirror (FRM) and works as a comb-like wavelength selection element as well as a sensor section in the sigma-branch of the laser cavity. Further, due to the FRM reflection scheme, the double-pass C- CLPG compensates for birefringence variation in the sigma-branch during the sensing. In the experiment, the sensor section near the C- CLPG is intentionally deformed to induce birefringence variation assuming the external disturbances; nevertheless, it is confirmed that the double-pass C-CLPG provides stable polarization states. Then, under the birefringence variation, it is demonstrated that the proposed EDFσL can achieve a stable oscillation and resultant precise measurements in contrast to the simple EDF ring laser using the single- pass C-CLPG. In addition, for the demonstration of the sensor with external force to the fiber, the oscillation wavelength of EDFσL in response to axial strain is investigated, and a linear response with sensitivity ~0.32 pm/µε is obtained.","PeriodicalId":13437,"journal":{"name":"IEICE Electron. Express","volume":"54 1","pages":"20220394"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79424670","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 : 2022-01-01DOI: 10.1587/elex.19.20220343
Subramaniyan Geethanjali, K. Vijayakumar
{"title":"Testing and implementation of dual way DC-DC converter for electric vehicle power train system","authors":"Subramaniyan Geethanjali, K. Vijayakumar","doi":"10.1587/elex.19.20220343","DOIUrl":"https://doi.org/10.1587/elex.19.20220343","url":null,"abstract":"","PeriodicalId":13437,"journal":{"name":"IEICE Electron. Express","volume":"28 1","pages":"20220343"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80462304","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 : 2022-01-01DOI: 10.1587/elex.19.20220257
Riku Yoshino, Tomohiko Kanaya, Shintaro Takada, K. Jitsuno, K. Inagaki, T. Kawanishi
In recent years, millimeter and terahertz waves have attracted significant attention owing to their potential applications in high-speed wireless communication. However, such waves are susceptible to being scattered from surfaces of surrounding objects because their wavelengths are short and sensitive to even minimal roughness. Therefore, using an electromagnetic wave scattering theory based on the stochastic integral, millimeter-wave scattering distributions from minimally rough surfaces such as stones were investigated in simulations and experiments. Finally, millimeter-wave scattering measurements were compared to experimental and simulation results. key words: Millimeter-wave, Scattering, Stochastic function, Rough surface Classification: Microwave and millimeter wave devices, circuits, and hardware
{"title":"Modeling and evaluation of millimeter wave scattering from minimally rough surfaces on stones","authors":"Riku Yoshino, Tomohiko Kanaya, Shintaro Takada, K. Jitsuno, K. Inagaki, T. Kawanishi","doi":"10.1587/elex.19.20220257","DOIUrl":"https://doi.org/10.1587/elex.19.20220257","url":null,"abstract":"In recent years, millimeter and terahertz waves have attracted significant attention owing to their potential applications in high-speed wireless communication. However, such waves are susceptible to being scattered from surfaces of surrounding objects because their wavelengths are short and sensitive to even minimal roughness. Therefore, using an electromagnetic wave scattering theory based on the stochastic integral, millimeter-wave scattering distributions from minimally rough surfaces such as stones were investigated in simulations and experiments. Finally, millimeter-wave scattering measurements were compared to experimental and simulation results. key words: Millimeter-wave, Scattering, Stochastic function, Rough surface Classification: Microwave and millimeter wave devices, circuits, and hardware","PeriodicalId":13437,"journal":{"name":"IEICE Electron. Express","volume":"50 1","pages":"20220257"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83077537","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 : 2022-01-01DOI: 10.1587/elex.19.20220225
Mao Ni, Lan Chen, Xiaoran Hao, Chenji Liu, Yiheng Zhang, Ying Li
STT-RAM with high storage density, near-zero leakage energy and CMOS compatibility is regarded as a replacement for SRAM to build large-sized cache, which can effectively alleviate the “memory wall” and improve computing power of IoT terminals. The state-of-the-art Near-Side Prefetch Throttling (NST) oriented to SRAM cache can effectively hide the access latency of off-chip memory. However, it also shows some inadaptability to the long write latency and high write energy of STT-RAM cache. The NST algorithm can not timely alleviate the cache congestion caused by STT-RAM long write latency, moreover, if the STT-RAM cache is congested, adjusting the prefetch distance is invalid to improve the prefetch timeliness. In response to the above problems, this paper novelly proposes a periodic and real-time complementary prefetch algorithm called ENCP for STT-RAM cache. Experiments show that, compared to the best- performed STREAM prefetcher, ENCP can reduce the write energy of STTRAM cache by 8.3% on average and 23% the most and improve the CPU IPC performance by 0.46% on average and 3.1% the most. And the ENCP has better performance and lower dynamic energy compared with NST with almost the same hardware overhead.
{"title":"Elastic adaptive prefetching for non-volatile cache in IoT terminals","authors":"Mao Ni, Lan Chen, Xiaoran Hao, Chenji Liu, Yiheng Zhang, Ying Li","doi":"10.1587/elex.19.20220225","DOIUrl":"https://doi.org/10.1587/elex.19.20220225","url":null,"abstract":"STT-RAM with high storage density, near-zero leakage energy and CMOS compatibility is regarded as a replacement for SRAM to build large-sized cache, which can effectively alleviate the “memory wall” and improve computing power of IoT terminals. The state-of-the-art Near-Side Prefetch Throttling (NST) oriented to SRAM cache can effectively hide the access latency of off-chip memory. However, it also shows some inadaptability to the long write latency and high write energy of STT-RAM cache. The NST algorithm can not timely alleviate the cache congestion caused by STT-RAM long write latency, moreover, if the STT-RAM cache is congested, adjusting the prefetch distance is invalid to improve the prefetch timeliness. In response to the above problems, this paper novelly proposes a periodic and real-time complementary prefetch algorithm called ENCP for STT-RAM cache. Experiments show that, compared to the best- performed STREAM prefetcher, ENCP can reduce the write energy of STTRAM cache by 8.3% on average and 23% the most and improve the CPU IPC performance by 0.46% on average and 3.1% the most. And the ENCP has better performance and lower dynamic energy compared with NST with almost the same hardware overhead.","PeriodicalId":13437,"journal":{"name":"IEICE Electron. Express","volume":"35 1","pages":"20220225"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75801210","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 : 2022-01-01DOI: 10.1587/elex.19.20220253
H. Qiang, Pengcheng Kong, Jianfeng Zheng, Yuanlong Liu
{"title":"Research on screening of lithium battery based on capacity-voltage second derivative and equalization charging technology","authors":"H. Qiang, Pengcheng Kong, Jianfeng Zheng, Yuanlong Liu","doi":"10.1587/elex.19.20220253","DOIUrl":"https://doi.org/10.1587/elex.19.20220253","url":null,"abstract":"","PeriodicalId":13437,"journal":{"name":"IEICE Electron. Express","volume":"50 1","pages":"20220253"},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89231462","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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