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Optical mode group division multiplexing (MGDM) system over graded index-multimode fiber 基于梯度折射率多模光纤的光模群分复用系统
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.887931
H. Chen, H. V. D. van den Boom, A. Koonen
{"title":"Optical mode group division multiplexing (MGDM) system over graded index-multimode fiber","authors":"H. Chen, H. V. D. van den Boom, A. Koonen","doi":"10.1117/12.887931","DOIUrl":"https://doi.org/10.1117/12.887931","url":null,"abstract":"This paper experimentally demonstrates the feasibility of a 2 x 2 MIMO optical communication system based on mode group diversion multiplexing in the presence of strong mode crosstalk over 250m GI-MMF. The parallel signal detection and processing are realized through the use of PD array.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"29 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":"121635604","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: 4
Multimodal endoscopic imaging and Raman spectroscopy for improving in vivo diagnosis of gastric malignancies during clinical gastroscopy 多模态内镜成像和拉曼光谱在临床胃镜检查中提高胃恶性肿瘤的体内诊断
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.887956
Mads S. Bergholt, Wei Zheng, Kan Lin, K. Ho, K. Yeoh, M. Teh, J. So, Zhiwei Huang
{"title":"Multimodal endoscopic imaging and Raman spectroscopy for improving in vivo diagnosis of gastric malignancies during clinical gastroscopy","authors":"Mads S. Bergholt, Wei Zheng, Kan Lin, K. Ho, K. Yeoh, M. Teh, J. So, Zhiwei Huang","doi":"10.1117/12.887956","DOIUrl":"https://doi.org/10.1117/12.887956","url":null,"abstract":"A near-infrared Raman spectroscopy system integrated with multimodal endoscopic imaging has been developed for in vivo diagnosis and detection of gastric malignancies during clinical gastroscopic examinations. In this study, 1238 high-quality in vivo Raman spectra in the range 800-1800 cm-1 were acquired from gastric normal and malignant tissue within 0.5 second from 81 patients under the guidance of white-light (WL), narrow-band (NB) and autofluorescence (AF) imaging during clinical endoscopy. Significant differences in Raman spectral shapes and intensities between normal and malignant gastric mucosal tissue were observed, particularly in the spectral ranges 800-900, 1000-1100, 1250-1450 and 1600-1800 cm-1, which primarily contain signals related to proteins, nucleic acids and lipids. Partial least squares discriminant analysis (PLS-DA) could identify in vivo Raman spectra of neoplasia with a sensitivity of 82.9% and specificity of 88.9% using leave-one-tissue site out cross validation. This study demonstrates that in vivo Raman spectroscopy in conjunction with multimodal endoscopic imaging modalities holds a great promise for improving the early diagnosis of gastric malignancies.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"86 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":"123152217","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
High power GaN-based LEDs with nano-structured Ga-doped ZnO (GZO) transparent conductive layer (TCL) 具有纳米结构ga掺杂ZnO透明导电层(TCL)的高功率gan基led
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.888412
W. Jia, B. Fan, Hao Jiang, Yang Liu, Baijun Zhang, Y. Xian, Shanjin Huang, Zhiyuan Zheng, Zhisheng Wu, Keny Tong, Raymond A. Wong, Gang Wang
{"title":"High power GaN-based LEDs with nano-structured Ga-doped ZnO (GZO) transparent conductive layer (TCL)","authors":"W. Jia, B. Fan, Hao Jiang, Yang Liu, Baijun Zhang, Y. Xian, Shanjin Huang, Zhiyuan Zheng, Zhisheng Wu, Keny Tong, Raymond A. Wong, Gang Wang","doi":"10.1117/12.888412","DOIUrl":"https://doi.org/10.1117/12.888412","url":null,"abstract":"High power GaN-based LEDs with nano-structured Ga-doped ZnO (GZO) transparent conductive layer (TCL) were fabricated by using metal-organic chemical vapor deposition (MOCVD) method. Compared with the conventional LED with Ni/Au or ITO process, the saturation current in the LEDs with GZO TCL approximately increased up to more than 14 % and 13 %, and the light output intensity up to 57.5 % and 30.1 %, respectively. This improvement was attributed to the high carrier concentration of GZO TCL and the planar structure at the TCL bottom, which improved the electrical conductivity, and therefore promoted current spreading. The refractive index of GZO is similar to GaN (n ≈ 2) and thereby results in the reduction of the reflection loss between GaN and TCL interface. In addition, the nano-structure of GZO TCL increased the light output critical angle and enhanced surface light emitting while reducing the lateral light loss and consequently improved light extraction efficiency of LEDs.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","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":"129650062","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
Comparison between MZI and single phase modulator for generating 112 Gbit/s PDM-QPSK signal MZI与单相调制器产生112gbit /s PDM-QPSK信号的比较
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.887400
Junyi Wang, K. Gao, Lu Yang, Xuan He, Z. Pan
{"title":"Comparison between MZI and single phase modulator for generating 112 Gbit/s PDM-QPSK signal","authors":"Junyi Wang, K. Gao, Lu Yang, Xuan He, Z. Pan","doi":"10.1117/12.887400","DOIUrl":"https://doi.org/10.1117/12.887400","url":null,"abstract":"We demonstrated the QPSK signal generated by a single phase-modulator (PM-QPSK) is more tolerant to nonlinearity than that generated by the Mach Zehnder Interferometer (MZI-QPSK). With simulation of WDM system at 28 Gsymbol/s per polarization the performance of PM-QPSK and MZI-QPSK are compared when dispersion management is used. After 800 km's transmission in single-polarization transmission system, MZI-QPSK outperforms PM-QPSK because of its better tolerance to ISI. After 400 km's transmission in polarization multiplexing system, PM-QPSK outperforms MZI-QPSK by comparing the symbol error ratio with optimized launch power, which is because PM-QPSK has better nonlinearity tolerance in dispersion managed system.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"152 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":"127334476","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
Fiber nonlinearity post compensation via spectral inversion for 40Gb/s long-haul CO-OFDM transmission systems 40Gb/s远距离CO-OFDM传输系统的频谱反演光纤非线性后补偿
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.890113
Yaojun Qiao, Xuejun Liu, Yuefeng Ji
{"title":"Fiber nonlinearity post compensation via spectral inversion for 40Gb/s long-haul CO-OFDM transmission systems","authors":"Yaojun Qiao, Xuejun Liu, Yuefeng Ji","doi":"10.1117/12.890113","DOIUrl":"https://doi.org/10.1117/12.890113","url":null,"abstract":"Fiber nonlinearity is the important determinant of applying orthogonal frequency division multiplexing (OFDM) in optical transmission systems. In this paper, the fiber nonlinearity impairments in 40Gb/s coherent optical (CO-OFDM) system are post-compensated by a new method of fiber nonlinearity post-compensation (FNPC). FNPC located before the CO-OFDM receiver includes spectrum inversion (SI) and a subsequent 80km compensation high nonlinear fiber (HNLF), in which SI is based on four wave mixing (FWM) in semiconductor optical amplifier (SOA), not necessary to be inserted into the middle of link. The fiber nonlinearity impairments in transmission link are post-compensated after SI by transmission through the HNLF with large nonlinearity coefficient. Simulating results show that the nonlinear threshold (NLT) (for Q >10 dB) can be increased by almost 2.5 dB and maximum Q factor can increase about 1.2 dB for single-channel 40Gb/s CO-OFDM system with optical dispersion compensation. For 50-GHz channel spacing WDM systems a benefit of about 1.1 dB is still possible in NLT, equating to a 0.7 dB increase in maximum Q.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"111 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":"126903799","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
Research on sensor design for internet of things and laser manufacturing 物联网与激光制造传感器设计研究
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.890271
Tao Wang, Jia-quan Yao, Ling Guo, Yanchun Zhang
{"title":"Research on sensor design for internet of things and laser manufacturing","authors":"Tao Wang, Jia-quan Yao, Ling Guo, Yanchun Zhang","doi":"10.1117/12.890271","DOIUrl":"https://doi.org/10.1117/12.890271","url":null,"abstract":"In this paper, we will introduce the research on sensor design for IOT (Internet of Things) and laser manufacturing, and supporting the establishment of local area IOT. The main contents include studying on the structure designing of silicon micro tilt sensor, data acquisition and processing, addressing implanted and building Local Area IOT with wireless sensor network technology. At last, it is discussed the status and trends of the Internet of Things from the promoters, watchers, pessimists and doers.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"29 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":"125509800","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
An improved 3-stage L-band erbium-doped fiber amplifier 一种改进的三级l波段掺铒光纤放大器
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.891781
S. Qin, Jinlin He, Yongzhuo Zou, Zexuan Qiang
{"title":"An improved 3-stage L-band erbium-doped fiber amplifier","authors":"S. Qin, Jinlin He, Yongzhuo Zou, Zexuan Qiang","doi":"10.1117/12.891781","DOIUrl":"https://doi.org/10.1117/12.891781","url":null,"abstract":"A 3-stage structure L-band EDFA is introduced to enhance the poor power conversion efficiency by utilizing the wasted ASE from the third EDF section and pump bypass in 1-2 stage. The results indicate that the EDFA could provide low-noise, high-gain and large-flatness ranging from 1570 to 1610 nm.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"52 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":"124550445","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
The implementation of a novel P2P service redirection mechanism in passive optical network 无源光网络中一种新型P2P服务重定向机制的实现
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.887982
Xinting Jiang, Xue Chen, Dongchao Ma, Ning Wang
{"title":"The implementation of a novel P2P service redirection mechanism in passive optical network","authors":"Xinting Jiang, Xue Chen, Dongchao Ma, Ning Wang","doi":"10.1117/12.887982","DOIUrl":"https://doi.org/10.1117/12.887982","url":null,"abstract":"In order to resolve the P2P topology mismatch problem, a novel P2P service redirection scheme has been proposed by us and the scheme is fully described in reference. Furthermore, we have successfully implemented this mechanism in EPON system. Experimental results show that our scheme can effectively reduce core network traffic, and evidently improve clients' downloading rate.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"144 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":"123278585","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
All-optical 1x2 switch using Fabry-Perot laser diodes 全光1x2开关采用法布里-珀罗激光二极管
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.888329
M. Rakib-Uddin, T. Hoai, B. Nakarmi, Y. Won
{"title":"All-optical 1x2 switch using Fabry-Perot laser diodes","authors":"M. Rakib-Uddin, T. Hoai, B. Nakarmi, Y. Won","doi":"10.1117/12.888329","DOIUrl":"https://doi.org/10.1117/12.888329","url":null,"abstract":"In this paper, an all-optical 1x2 switch is demonstrated based on gain modulation of injection locked Fabry-Perot laser diode (FP-LD). The control circuit generates set and reset states, which are used to perform 1x2 switch function. The switch output state is maintained once it starts to operate, whether the control signal is present or absent. In the experiment, with extinction ratio of 13.2 dB the switch output eye diagram is recorded.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"11 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":"124749805","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
The mesopic effect of different correlated color temperature LED light sources on road lighting 不同相关色温LED光源对道路照明的介观效应
SPIE/OSA/IEEE Asia Communications and Photonics Pub Date : 2010-12-08 DOI: 10.1117/12.888527
Xuan Li, Shangzhong Jin, Yanhua Wang, Songyuan Cen, Pei Liang, Le Wang, Xiaoyan Li
{"title":"The mesopic effect of different correlated color temperature LED light sources on road lighting","authors":"Xuan Li, Shangzhong Jin, Yanhua Wang, Songyuan Cen, Pei Liang, Le Wang, Xiaoyan Li","doi":"10.1117/12.888527","DOIUrl":"https://doi.org/10.1117/12.888527","url":null,"abstract":"The theory of mesopic vision provides an important theoretical foundation for the choice of road lighting sources. Based upon a number of recent mesopic photometry studies, an equation (Emes = B•EP) to deduce from the Ep (photopic illumination) to Emes (mesopic equivalent illumination) is proposed, where B is instant for modified coefficient. The coefficient B can be used easily to calculate the mesopic equivalent illumination by using the measuring results of photopic illumination for different correlated color temperature (CCT) light sources under mesopic light levels. Using the equation, we analyze the variation of coefficient B with background lighting level of the different correlated color temperature lighting sources under mesopic vision levels. By calculating the mesopic equivalent illumination of the different sources, our results showing that the higher correlated color temperature LED sources have better visual effects. Moreover, the results provide a basis for further studies on the illuminometer, which might be suitable for mesopic vision.","PeriodicalId":179447,"journal":{"name":"SPIE/OSA/IEEE Asia Communications and Photonics","volume":"7991 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":"129413520","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: 3
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