Experimental studies on humidity measurements by using a FBG-based humidity sensor with multi-layer polyimide coating are demonstrated. The preliminary experiments for investigating the performances of this polyimide-coating humidity sensor are carried out and several experimental results in measurements of the relative humidity and moisture in oil are presented.
{"title":"Experimental study on humidity sensing using a FBG sensor with polyimide coating","authors":"Fuxin Ding, Lutang Wang, N. Fang, Zhaoming Huang","doi":"10.1117/12.887827","DOIUrl":"https://doi.org/10.1117/12.887827","url":null,"abstract":"Experimental studies on humidity measurements by using a FBG-based humidity sensor with multi-layer polyimide coating are demonstrated. The preliminary experiments for investigating the performances of this polyimide-coating humidity sensor are carried out and several experimental results in measurements of the relative humidity and moisture in oil are presented.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116065625","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}
An all-optical ON-OFF switch is demonstrated using a single-mode Fabry-Perot laser diode. A 10 Gb/s data signal is switched ON and OFF with an extinction ratio of 15.4 dB. The rising and falling times of the switch were measured as 90 ps and 80 ps, respectively.
{"title":"All-optical ON-OFF switch using a single-mode Fabry-Perot laser diode","authors":"M. Rakib-Uddin, B. Nakarmi, T. Hoai, Y. Won","doi":"10.1117/12.888295","DOIUrl":"https://doi.org/10.1117/12.888295","url":null,"abstract":"An all-optical ON-OFF switch is demonstrated using a single-mode Fabry-Perot laser diode. A 10 Gb/s data signal is switched ON and OFF with an extinction ratio of 15.4 dB. The rising and falling times of the switch were measured as 90 ps and 80 ps, respectively.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126617116","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}
The way to improve the reflectivity of chemical composition grating (CCG) sensors is studied. Experimental results show that improving the initial fiber Bragg grating (FBG) reflectivity strength and enhancing the hydrogen concentration in the initial FBG inscription help to increase the reflectivity of the CCG sensors at high temperatures.
{"title":"Research on reflectivity of chemical composition grating sensors at high temperatures","authors":"Guoyu Li, B. Guan","doi":"10.1117/12.888208","DOIUrl":"https://doi.org/10.1117/12.888208","url":null,"abstract":"The way to improve the reflectivity of chemical composition grating (CCG) sensors is studied. Experimental results show that improving the initial fiber Bragg grating (FBG) reflectivity strength and enhancing the hydrogen concentration in the initial FBG inscription help to increase the reflectivity of the CCG sensors at high temperatures.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125978260","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}
Layer-thickness dependence of Si-nanocrystal formation in amorphous Si/SiO2 multilayers during thermal annealing is experimentally demonstrated with RF-sputtered samples, and further explained by a modified model. The theoretical calculation shows that there is a lower limit (1.5nm) of Si layer thickness and lateral growth of Si-nanocrystal is unconstrained in such multilayers.
{"title":"Layer-thickness-dependent formation of Si-nanocrystals embedded in amorphous Si/SiO2 multilayers","authors":"K. Chen, Xue Feng, Yidong Huang","doi":"10.1117/12.888342","DOIUrl":"https://doi.org/10.1117/12.888342","url":null,"abstract":"Layer-thickness dependence of Si-nanocrystal formation in amorphous Si/SiO2 multilayers during thermal annealing is experimentally demonstrated with RF-sputtered samples, and further explained by a modified model. The theoretical calculation shows that there is a lower limit (1.5nm) of Si layer thickness and lateral growth of Si-nanocrystal is unconstrained in such multilayers.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126975665","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}
There has been growing interest in transmitting synchronization information over OTN. A novel scheme is proposed in the paper for this purpose. In order to support precise time synchronization information transfer over OTN, the proposed scheme designs the new overhead, equipment function architectures and interworking mechanism of synchronization message for OTN.
{"title":"A novel scheme for frequency and time information transfer over OTN","authors":"Chao Fang, Pengfei Yang, Xue Chen","doi":"10.1117/12.890122","DOIUrl":"https://doi.org/10.1117/12.890122","url":null,"abstract":"There has been growing interest in transmitting synchronization information over OTN. A novel scheme is proposed in the paper for this purpose. In order to support precise time synchronization information transfer over OTN, the proposed scheme designs the new overhead, equipment function architectures and interworking mechanism of synchronization message for OTN.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121898684","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}
We report on our ongoing research activities on integrated EPON and WLAN-based wireless mesh networks with a focus on reducing the CO2 footprint and improving the bandwidth-efficient video transport of fiber-wireless (FiWi) access networks. Various power saving techniques and mechanisms for efficient video transport in FiWi access networks are discussed.
{"title":"Fiber-wireless (FiWi) access networks for a green video-dominated future internet","authors":"M. Maier","doi":"10.1117/12.889912","DOIUrl":"https://doi.org/10.1117/12.889912","url":null,"abstract":"We report on our ongoing research activities on integrated EPON and WLAN-based wireless mesh networks with a focus on reducing the CO2 footprint and improving the bandwidth-efficient video transport of fiber-wireless (FiWi) access networks. Various power saving techniques and mechanisms for efficient video transport in FiWi access networks are discussed.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122598521","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}
Pupil filters designed to overcome the resolution limits imposed by diffraction imaging systems have been the aim of many research efforts. A great number of previous efforts have been chiefly focused on improving the resolving capacity of imaging systems such as optical pickups and laser printers in the transverse direction while a low number of publications have been addressed to achieve super-resolution along the axial direction. However, when dealing with imaging systems in which optical sectioning is important there is of great interest to improve the axial resolution. The high depth-discrimination feature allows the formation of three-dimensional images by sectioning only a thin slice of a sample at a time. Presently, most super-resolution performances based on the pupil filters are analyzed by the assumpran that the incident beam of the imaging system is Uniform amplitude beam. However, from a practical perspective, the incident beam from a laser is a Gaussian beam with a Gaussian field amplitude distribution. The focusing lens cannot be overfilled and the spot size will tend to be larger. Therefore, it is necessary to research the axial resolution performances of Gaussian beam. In this work, we assume the incident beam of the imaging system is Gaussian beam and theoretically investigate the axial intensity point spread function (PSF) of Gaussian beam with the specified pupil filters. As our previous work, several parameters such as the Strehl ratio, the axial super-resolving gain and side-lobe to peak intensity ratio are introduced to describe the super-resolution performance. The Strehl ratio S is a relevant parameter for analyzing image quality and is defined as the ratio of the intensity at the focal point to that corresponding to an unobstructed pupil. The axial super-resolving gain GA gives a measure of the super-resolution performance in the axial direction and is defined as the ratio between the first minimum of the super-resolution pattern and the first minimum of the clear pupil pattern. In a particular direction, a filter is super-resolving when the corresponding gain is greater than unity and it is an apodizer when the corresponding gain is lower than unity. The side-lobe to peak intensity ratio M is to evaluate the impact of the side-lobe on the central-lobe and is given by the maximum intensity of side-lobes to the intensity of central peak.
为克服衍射成像系统的分辨率限制而设计的瞳孔滤光片一直是许多研究工作的目标。以前的大量工作主要集中在提高光学拾取器和激光打印机等成像系统在横向上的分辨能力，而在轴向上实现超分辨的出版物很少。然而，当处理成像系统，其中光学切片是重要的有很大的兴趣，以提高轴向分辨率。高深度辨别功能允许通过一次仅切片样品的薄片来形成三维图像。目前，大多数基于瞳孔滤光片的超分辨性能分析都是假设成像系统的入射光束为等幅光束。然而，从实际应用的角度来看，激光的入射光束是高斯光束，具有高斯场振幅分布。聚焦镜头不能过度填充，光斑尺寸会变大。因此，有必要对高斯光束的轴向分辨性能进行研究。本文假设成像系统的入射光束为高斯光束，并从理论上研究了高斯光束的轴向强度点扩散函数(PSF)。与我们之前的工作一样，引入了一些参数，如Strehl比、轴向超分辨增益和旁瓣与峰值强度比来描述超分辨性能。Strehl ratio S是分析图像质量的一个相关参数，定义为焦点处的光强与未遮挡瞳孔对应的光强之比。轴向超分辨增益GA给出了轴向超分辨性能的度量，定义为超分辨图形的第一个最小值与清晰瞳孔图形的第一个最小值之间的比值。在特定的方向上，当相应的增益大于1时，滤波器是超分辨的;当相应的增益小于1时，滤波器是向位的。旁瓣与峰值强度比M用于评价旁瓣对中心瓣的影响，由旁瓣最大强度与中心峰强度之比给出。
{"title":"Axial resolution performances of Gaussian beam with pupil filters","authors":"Xiaofeng Zhao, Zhili Zhang, Chuntong Liu","doi":"10.1117/12.888160","DOIUrl":"https://doi.org/10.1117/12.888160","url":null,"abstract":"Pupil filters designed to overcome the resolution limits imposed by diffraction imaging systems have been the aim of many research efforts. A great number of previous efforts have been chiefly focused on improving the resolving capacity of imaging systems such as optical pickups and laser printers in the transverse direction while a low number of publications have been addressed to achieve super-resolution along the axial direction. However, when dealing with imaging systems in which optical sectioning is important there is of great interest to improve the axial resolution. The high depth-discrimination feature allows the formation of three-dimensional images by sectioning only a thin slice of a sample at a time. Presently, most super-resolution performances based on the pupil filters are analyzed by the assumpran that the incident beam of the imaging system is Uniform amplitude beam. However, from a practical perspective, the incident beam from a laser is a Gaussian beam with a Gaussian field amplitude distribution. The focusing lens cannot be overfilled and the spot size will tend to be larger. Therefore, it is necessary to research the axial resolution performances of Gaussian beam. In this work, we assume the incident beam of the imaging system is Gaussian beam and theoretically investigate the axial intensity point spread function (PSF) of Gaussian beam with the specified pupil filters. As our previous work, several parameters such as the Strehl ratio, the axial super-resolving gain and side-lobe to peak intensity ratio are introduced to describe the super-resolution performance. The Strehl ratio S is a relevant parameter for analyzing image quality and is defined as the ratio of the intensity at the focal point to that corresponding to an unobstructed pupil. The axial super-resolving gain GA gives a measure of the super-resolution performance in the axial direction and is defined as the ratio between the first minimum of the super-resolution pattern and the first minimum of the clear pupil pattern. In a particular direction, a filter is super-resolving when the corresponding gain is greater than unity and it is an apodizer when the corresponding gain is lower than unity. The side-lobe to peak intensity ratio M is to evaluate the impact of the side-lobe on the central-lobe and is given by the maximum intensity of side-lobes to the intensity of central peak.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131741565","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}
The 2nd-order fractional Talbot effect is employed to multiply the 10-GHz optical pulse-train injection for 4th-order ration-harmonic-mode-locking of a SOA fiber laser at 40-GHz. With improved modulation-depth by enlarging pulse-extinction-ratio from 0.55 to 2.3, the SOAFL generates 8ps pulsewidth and 170 fs timing jitter when injection-pulse with 2-GHz peak-to-peak chirp.
{"title":"Fractional Talbot effect induced rational-harmonic mode-locking of 40-GHz SOA fiber laser","authors":"Jung-Jui Kang, Chao-Kuei Lee, Gong-Ru Lin","doi":"10.1117/12.889367","DOIUrl":"https://doi.org/10.1117/12.889367","url":null,"abstract":"The 2nd-order fractional Talbot effect is employed to multiply the 10-GHz optical pulse-train injection for 4th-order ration-harmonic-mode-locking of a SOA fiber laser at 40-GHz. With improved modulation-depth by enlarging pulse-extinction-ratio from 0.55 to 2.3, the SOAFL generates 8ps pulsewidth and 170 fs timing jitter when injection-pulse with 2-GHz peak-to-peak chirp.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130220361","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}
Physical-layer attacks, such as power jamming, can present a serious security threat to transparent optical networks. We present a novel security framework based on protection using attack-aware planning, with the objective to minimize the potential damage caused by various attack scenarios in a cost-effective manner.
{"title":"Attack-aware planning and optimization in transparent optical networks","authors":"N. Skorin-Kapov","doi":"10.1117/12.890136","DOIUrl":"https://doi.org/10.1117/12.890136","url":null,"abstract":"Physical-layer attacks, such as power jamming, can present a serious security threat to transparent optical networks. We present a novel security framework based on protection using attack-aware planning, with the objective to minimize the potential damage caused by various attack scenarios in a cost-effective manner.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130695127","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 : 2010-12-08DOI: 10.1109/ACP.2010.5682829
Ma Zheng, Zhang Yongjun, Cao Yang, Cao Chang, Zhao Yongli, Gu Wanyi
This paper introduces a dynamic bandwidth assignment algorithm designed for ring topology (R-DBA) in order to meet the needs of the construction of Metropolitan Area Network (MAN).This algorithm targets ring topology, based on fair iteration, supports various Qos services and has previous assignment mechanism.
{"title":"A dynamic bandwidth assignment algorithm designed for ring topology","authors":"Ma Zheng, Zhang Yongjun, Cao Yang, Cao Chang, Zhao Yongli, Gu Wanyi","doi":"10.1109/ACP.2010.5682829","DOIUrl":"https://doi.org/10.1109/ACP.2010.5682829","url":null,"abstract":"This paper introduces a dynamic bandwidth assignment algorithm designed for ring topology (R-DBA) in order to meet the needs of the construction of Metropolitan Area Network (MAN).This algorithm targets ring topology, based on fair iteration, supports various Qos services and has previous assignment mechanism.","PeriodicalId":126232,"journal":{"name":"Asia Communications and Photonics Conference and Exhibition","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134423581","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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