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A new refractive index sensor based on Mach-Zehnder interferometer fabricated by two cascaded single-mode fiber corners 一种基于马赫-曾德尔干涉仪的双级联单模光纤角折射率传感器
Photonics Asia Pub Date : 2014-12-12 DOI: 10.1117/12.2071509
Qingguo Shi, Baojin J. Peng, Daru Chen, Salai Fu, Huanhuan Dai
{"title":"A new refractive index sensor based on Mach-Zehnder interferometer fabricated by two cascaded single-mode fiber corners","authors":"Qingguo Shi, Baojin J. Peng, Daru Chen, Salai Fu, Huanhuan Dai","doi":"10.1117/12.2071509","DOIUrl":"https://doi.org/10.1117/12.2071509","url":null,"abstract":"We reported two kinds of fiber sensor based on double cascaded single mode fiber corners, which has a high sensitivity for refractive index (RI) sensing. RI sensing was experimentally demonstrated with average sensitivity of 95.5nm/RI unit (RIU) in a RI range from 1.333 to 1.421 and the other is 235nm/RI unit (RIU) from 1.333 to 1.418, which are relatively high among the previously reported similar fiber sensors (e.g., it is about 10 times higher than that of the normal two or three-cascaded-taper based Mach–Zehnder interferometer). Besides, The proposed RI sensors were fabricated only by a fiber fusion splicer. So , the fiber sensor is quite easy to made.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133192134","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}
引用次数: 2
Ray-tracing method to analyze and quantify the light enhancement around subsurface defects in transparent materials 光线追踪法分析和量化透明材料表面缺陷周围的光增强
Photonics Asia Pub Date : 2014-12-10 DOI: 10.1117/12.2074559
Rong Wu, Dongfeng Zhao, Lei Zhang, Ping Shao, N. Hua, Zunqi Lin
{"title":"Ray-tracing method to analyze and quantify the light enhancement around subsurface defects in transparent materials","authors":"Rong Wu, Dongfeng Zhao, Lei Zhang, Ping Shao, N. Hua, Zunqi Lin","doi":"10.1117/12.2074559","DOIUrl":"https://doi.org/10.1117/12.2074559","url":null,"abstract":"Laser-induced damage (LID) to optical glass has become a growing problem in high-power laser systems. It is well known that the main reason of glass being damaged is due to defects and impurities in the material. Damage caused by subsurface defects (SSDs) is especially common in actual system running. Accordingly, in the presence of SSDs, a simple and alternative calculation method is developed to evaluate the enhancement of light field around the incident and exit surface. This ray tracing approach, based on the classical optics theory, is very direct and clear to show the optical phenomena of light intensity enhancement. Some basic SSD shapes have been studied and investigated here, which reveals the importance and boundary condition of controlling the size and density of SSDs in grinding and polishing process. Finally, to achieve optimal breadth depth ratio, the least etching amounts by hydrofluoric (HF) acid is investigated. The theoretical analysis and simulation results provide an appropriate range of removal amounts, which is very important in the HF etching process.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116815920","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}
引用次数: 1
780W narrow linewidth all fiber laser with sinusoidal phase modulation 780W窄线宽全光纤激光器，正弦相位调制
Photonics Asia Pub Date : 2014-12-10 DOI: 10.1117/12.2074573
Liming Zhang, Shouhuan Zhou, Hong Zhao, Kun Zhang, J. Hao, Dayong Zhang, Chen Zhu, Y. Li, Xiongfei Wang, Nian-jiang Chen
{"title":"780W narrow linewidth all fiber laser with sinusoidal phase modulation","authors":"Liming Zhang, Shouhuan Zhou, Hong Zhao, Kun Zhang, J. Hao, Dayong Zhang, Chen Zhu, Y. Li, Xiongfei Wang, Nian-jiang Chen","doi":"10.1117/12.2074573","DOIUrl":"https://doi.org/10.1117/12.2074573","url":null,"abstract":"In high power fiber laser, the limiting factor of narrow linewidth output is analyzed. The influence of Stimulated Brillouin scattering effect and sinusoidal phase modulation suppressing method are studied. The linewidth of a single frequency laser is broadened from 1MHz to 2.9 GHz by sinusoidal phase modulation technology. The output power of single frequency laser is 50mW. And through three stage fiber amplified, the central wavelength of 1064.34nm, linewidth of 2.9 GHz and power of 780W are achieved respectively. The optical-optical efficiency is 79%. And the beam quality is [see manuscript] and [see manuscript]. The distributing characteristic of longitudinal mode, under every modulating coefficient, is measured. And the result is the same as theoretical result. The increasing of longitudinal mode number, controlling of longitudinal mode spacing and reducing power spectrum density by sinusoidal phase modulation are proved to be viable. Then Stimulated Brillouin Scattering threshold is increased. Finally, the output power is increased a lot. The output power of this laser is only limited by pump power. If the pump power is increased, the higher power of narrow linewidth fiber laser will be achieved.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129713622","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}
引用次数: 0
Design an active imaging system using squeezed state light 设计一种利用压缩态光的主动成像系统
Photonics Asia Pub Date : 2014-12-04 DOI: 10.1117/12.2071173
Xu-ling Lin, S. Bi, Song Yang, Zhiqiang Wu, Baohua Wang, Chao Wang, N. Ruan, J. Ci
{"title":"Design an active imaging system using squeezed state light","authors":"Xu-ling Lin, S. Bi, Song Yang, Zhiqiang Wu, Baohua Wang, Chao Wang, N. Ruan, J. Ci","doi":"10.1117/12.2071173","DOIUrl":"https://doi.org/10.1117/12.2071173","url":null,"abstract":"Squeezed light is an important non-classical light field. In this paper, we demonstrated a designed active imaging system which use squeezed state light instead of coherent light as light source. The squeezed state light is generated by utilizing the degenerate optical parametric amplifier based on periodically poled KTiOPO4 crystal. In order to obtain better imaging results, microlens arrays are used for homogenizing the squeezed light. We describe experiment setup and present some design result.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"419 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122913664","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}
引用次数: 0
Sensing characteristics of clad-modified with nanocrystalline metal oxide fiber optic gas sensor 包层修饰纳米晶金属氧化物光纤气体传感器的传感特性
Photonics Asia Pub Date : 2014-12-04 DOI: 10.1117/12.2071440
D. Sastikumar, B. Renganathan
{"title":"Sensing characteristics of clad-modified with nanocrystalline metal oxide fiber optic gas sensor","authors":"D. Sastikumar, B. Renganathan","doi":"10.1117/12.2071440","DOIUrl":"https://doi.org/10.1117/12.2071440","url":null,"abstract":"Clad-modified with nanocrystalline metal oxide fiber optic gas sensors have been proposed for ambient temperature operation. The sensor output light intensity either increases or decreases when the gas concentration is increased. Study shows that optical properties of metal-oxides with air medium influence the gas sensing. Absorption characteristics of nanocrystalline metal oxides ( ZnO, Sm2O3 and Ce doped ZnO etc., ) in air, methanol, ethanol and ammonia are analyzed as well as their effect on gas sensing.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127631375","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}
引用次数: 2
Fiber-connected position localization sensor networks 光纤连接位置定位传感器网络
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2073593
S. Pan, Dan Zhu, Jianbin Fu, T. Yao
{"title":"Fiber-connected position localization sensor networks","authors":"S. Pan, Dan Zhu, Jianbin Fu, T. Yao","doi":"10.1117/12.2073593","DOIUrl":"https://doi.org/10.1117/12.2073593","url":null,"abstract":"Position localization has drawn great attention due to its wide applications in radars, sonars, electronic warfare, wireless communications and so on. Photonic approaches to realize position localization can achieve high-resolution, which also provides the possibility to move the signal processing from each sensor node to the central station, thanks to the low loss, immunity to electromagnetic interference (EMI) and broad bandwidth brought by the photonic technologies. In this paper, we present a review on the recent works of position localization based on photonic technologies. A fiber-connected ultra-wideband (UWB) sensor network using optical time-division multiplexing (OTDM) is proposed to realize high-resolution localization and moving the signal processing to the central station. A 3.9-cm high spatial resolution is achieved. A wavelength-division multiplexed (WDM) fiber-connected sensor network is also demonstrated to realize location which is independent of the received signal format.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114774402","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}
引用次数: 0
Photonic generation of phase-modulated microwave signals 相位调制微波信号的光子产生
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2073542
Wei Li
{"title":"Photonic generation of phase-modulated microwave signals","authors":"Wei Li","doi":"10.1117/12.2073542","DOIUrl":"https://doi.org/10.1117/12.2073542","url":null,"abstract":"Pulse compression is widely used to increase the range resolution for modern radars. To enlarge the pulse compression ratio, a phase-modulated microwave signal is usually involved. In this paper, we review recent progress of our group on the generation of phase-modulated microwave signals. These techniques features outstanding performances, wide bandwidth, and flexible tunability.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"9267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131134796","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}
引用次数: 0
Behavioral modeling and digital compensation of nonlinearity in DFB lasers for multi-band directly modulated radio-over-fiber systems 多波段直调光纤系统DFB激光器非线性行为建模与数字补偿
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2069888
Jianqiang Li, Chunjing Yin, Hao Chen, Feifei Yin, Yitang Dai, Kun Xu
{"title":"Behavioral modeling and digital compensation of nonlinearity in DFB lasers for multi-band directly modulated radio-over-fiber systems","authors":"Jianqiang Li, Chunjing Yin, Hao Chen, Feifei Yin, Yitang Dai, Kun Xu","doi":"10.1117/12.2069888","DOIUrl":"https://doi.org/10.1117/12.2069888","url":null,"abstract":"The envisioned C-RAN concept in wireless communication sector replies on distributed antenna systems (DAS) which consist of a central unit (CU), multiple remote antenna units (RAUs) and the fronthaul links between them. As the legacy and emerging wireless communication standards will coexist for a long time, the fronthaul links are preferred to carry multi-band multi-standard wireless signals. Directly-modulated radio-over-fiber (ROF) links can serve as a lowcost option to make fronthaul connections conveying multi-band wireless signals. However, directly-modulated radioover- fiber (ROF) systems often suffer from inherent nonlinearities from directly-modulated lasers. Unlike ROF systems working at the single-band mode, the modulation nonlinearities in multi-band ROF systems can result in both in-band and cross-band nonlinear distortions. In order to address this issue, we have recently investigated the multi-band nonlinear behavior of directly-modulated DFB lasers based on multi-dimensional memory polynomial model. Based on this model, an efficient multi-dimensional baseband digital predistortion technique was developed and experimentally demonstrated for linearization of multi-band directly-modulated ROF systems.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127377720","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}
引用次数: 1
Design of high-power and narrow divergence angle photonic crystal surface emitting lasers 高功率窄发散角光子晶体表面发射激光器的设计
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2073566
Xiaojie Guo, Yufei Wang, A. Qi, Lei Liu, F. Qi, W. Zheng
{"title":"Design of high-power and narrow divergence angle photonic crystal surface emitting lasers","authors":"Xiaojie Guo, Yufei Wang, A. Qi, Lei Liu, F. Qi, W. Zheng","doi":"10.1117/12.2073566","DOIUrl":"https://doi.org/10.1117/12.2073566","url":null,"abstract":"We design photonic crystal (PC) array surface emitting lasers with large-area coherence. The structure has six-fold rotational symmetry. By finite-difference time-domain method, we investigate the far-field characteristics of the individual element and the array. We demonstrate theoretically that the coherent PC array has lower far-field divergence angles and higher power compared to those of individual elements. Our PC array exhibits strong leaky coupling which has high mode stability and high intermodal discrimination. Thus, the coherent PC array shows great potential for high power low divergence in-phase surface laser emitting.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131459505","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}
引用次数: 0
Dynamic behaviors of a broad-area diode laser with lateral-mode-selected external feedback 具有侧模选择外反馈的广域二极管激光器的动态特性
Photonics Asia Pub Date : 2014-12-03 DOI: 10.1117/12.2071842
M. Chi, P. Petersen
{"title":"Dynamic behaviors of a broad-area diode laser with lateral-mode-selected external feedback","authors":"M. Chi, P. Petersen","doi":"10.1117/12.2071842","DOIUrl":"https://doi.org/10.1117/12.2071842","url":null,"abstract":"In this paper, we investigate the dynamics of a BAL with lateral-mode selected external feedback experimentally by measuring the far-field profile, intensity noise spectrum and time series of the output beam. The mode-selection is achieved by adjusting a stripe mirror at the pseudo far-field plane. Different dynamic behaviors are observed when different lateral modes are selected. When the mirror is aligned correctly and high-order modes are selected, in most of the cases periodic dynamics of the output power corresponding to a single roundtrip external-cavity loop is observed, but the dynamic behavior disappears in some case; when the zero-order mode is selected, periodic dynamics corresponding to a double roundtrip external-cavity loop is observed. When the stripe mirror is not aligned perfectly, a dynamic behavior like pulse-package oscillations is observed: a periodic oscillated output with a frequency of the single roundtrip external-cavity loop modulated by periodic low-frequency fluctuation. This is the first observation of pulse-package oscillation in a diode laser with long-cavity feedback, to our knowledge.","PeriodicalId":164339,"journal":{"name":"Photonics Asia","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123648326","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}
引用次数: 0
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