We present a combined optical coherence tomography (OCT) and line-scanning fluorescence laminar optical tomography (FLOT) system for simultaneous 3-D morphological and molecular imaging with 10–100 µm resolution and millimeter-scale imaging depth. Co-registration on a capillary phantom with fluorescence dye Cy5.5 using the system has been demonstrated.
{"title":"Multi-modality optical tomography for simultaneous morphological and molecular imaging","authors":"Shuai Yuan, Qian Li, Yu Chen","doi":"10.1364/ACP.2009.TUM2","DOIUrl":"https://doi.org/10.1364/ACP.2009.TUM2","url":null,"abstract":"We present a combined optical coherence tomography (OCT) and line-scanning fluorescence laminar optical tomography (FLOT) system for simultaneous 3-D morphological and molecular imaging with 10–100 µm resolution and millimeter-scale imaging depth. Co-registration on a capillary phantom with fluorescence dye Cy5.5 using the system has been demonstrated.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133484022","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}
A novel resonant cavity enhanced photodetector with asymmetric dual-absorption layer structures that shifts the limitation on bandwidth-efficiency further than is possible in conventional photodetector is proposed. The quantum efficiency and frequency bandwidth are 93% with a lower reflectivity of top mirror, and 88GHz with mesa area for 10µm×10µm, respectively.
{"title":"A novel dual-absorption resonant cavity enhanced photodetectors","authors":"Peng Fu, Yongqing Huang, X. Duan, X. Ren, Hui Huang, Qi Wang","doi":"10.1364/ACP.2009.WL42","DOIUrl":"https://doi.org/10.1364/ACP.2009.WL42","url":null,"abstract":"A novel resonant cavity enhanced photodetector with asymmetric dual-absorption layer structures that shifts the limitation on bandwidth-efficiency further than is possible in conventional photodetector is proposed. The quantum efficiency and frequency bandwidth are 93% with a lower reflectivity of top mirror, and 88GHz with mesa area for 10µm×10µm, respectively.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130346693","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}
A. Ortega-Moñux, Í. Molina-Fernández, J. G. Gangüemert-Pérez
We propose a technique to improve the performance of high index contrast Multimode Interference couplers. It is shown that imaging errors can be almost completely removed if the refractive index profile of the multimode region is properly designed. Optimized devices exhibit very low excess losses, power imbalance and phase errors.
{"title":"Index profile engineering of Multimode Interference couplers","authors":"A. Ortega-Moñux, Í. Molina-Fernández, J. G. Gangüemert-Pérez","doi":"10.1364/ACP.2009.WI2","DOIUrl":"https://doi.org/10.1364/ACP.2009.WI2","url":null,"abstract":"We propose a technique to improve the performance of high index contrast Multimode Interference couplers. It is shown that imaging errors can be almost completely removed if the refractive index profile of the multimode region is properly designed. Optimized devices exhibit very low excess losses, power imbalance and phase errors.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116844949","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}
Min Zhu, S. Xiao, W. Guo, A. Wei, Yaohui Jin, Weisheng Hu, Benoit Gellerd
Fault-tolerant scheduling is an important issue for optical gird applications because of a wide range of grid resource failures. To improve the availability of the DAGs (directed acyclic graphs), a primary-backup approach is considered when making DAG scheduling decision. Experiments demonstrate the effectiveness and the practicability of the proposed scheme.
{"title":"Fault-tolerant scheduling using primary-backup approach for optical grid applications","authors":"Min Zhu, S. Xiao, W. Guo, A. Wei, Yaohui Jin, Weisheng Hu, Benoit Gellerd","doi":"10.1364/ACP.2009.TuL4","DOIUrl":"https://doi.org/10.1364/ACP.2009.TuL4","url":null,"abstract":"Fault-tolerant scheduling is an important issue for optical gird applications because of a wide range of grid resource failures. To improve the availability of the DAGs (directed acyclic graphs), a primary-backup approach is considered when making DAG scheduling decision. Experiments demonstrate the effectiveness and the practicability of the proposed scheme.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"170 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114465818","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}
Broadband integrated Er-Yb doped phosphate glass waveguide amplifier based on cascaded long-period waveguide grating is proposed. The effect of transmittance spectrum of the proposed cascaded long-period waveguide grating on flattening gain is discussed. The transmission function of the cascaded long-period waveguide grating is obtained.
{"title":"Optimal design of cascaded long-period waveguide grating equalizer for broadband Er-Yb co-doped phosphate glass waveguide amplifiers","authors":"Hai-yan Chen","doi":"10.1364/ACP.2009.FP3","DOIUrl":"https://doi.org/10.1364/ACP.2009.FP3","url":null,"abstract":"Broadband integrated Er-Yb doped phosphate glass waveguide amplifier based on cascaded long-period waveguide grating is proposed. The effect of transmittance spectrum of the proposed cascaded long-period waveguide grating on flattening gain is discussed. The transmission function of the cascaded long-period waveguide grating is obtained.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128383265","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}
Current trends in communications indicate that multicasting is becoming increasingly popular and important in networking applications. Since multicasting can be supported more efficiently in optical domain by utilizing the inherent light-splitting capacity of optical devices, such as optical splitters, than by copying data in electronic domain, issues concerning running multicast sessions in the all-optical networks have received much attention in recent years. In this paper, different multicasting schemes and their performance in the Optical Packet Switched networks are investigated, including the parallel mode, serial mode, and hybrid mode multicasting schemes. Computer simulation results show that compared with the parallel-mode and serial-mode multicasting schemes, hybrid-mode multicasting scheme is the best way to deliver multicast sessions in the Optical Packet Switched networks due to its highest performance.
{"title":"High-performance multicasting schemes in Optical Packet Switched networks","authors":"Yuefeng Ji, Xin Liu, Jie Zhang, M. Zhang","doi":"10.1364/ACP.2009.THFF1","DOIUrl":"https://doi.org/10.1364/ACP.2009.THFF1","url":null,"abstract":"Current trends in communications indicate that multicasting is becoming increasingly popular and important in networking applications. Since multicasting can be supported more efficiently in optical domain by utilizing the inherent light-splitting capacity of optical devices, such as optical splitters, than by copying data in electronic domain, issues concerning running multicast sessions in the all-optical networks have received much attention in recent years. In this paper, different multicasting schemes and their performance in the Optical Packet Switched networks are investigated, including the parallel mode, serial mode, and hybrid mode multicasting schemes. Computer simulation results show that compared with the parallel-mode and serial-mode multicasting schemes, hybrid-mode multicasting scheme is the best way to deliver multicast sessions in the Optical Packet Switched networks due to its highest performance.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128832408","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 thermal nonlinear optical effect is observed in a microring resonator based on a small SU-8 polymer ridge optical waveguide. The resonant wavelength blue shifts almost linearly with a slope of about −0.8 pm/mW as the input power increases. The absorption mechanism is analyzed in detail.
{"title":"Observation of the thermal nonlinear optical effect in a microring resonator based on a small SU-8 polymer ridge optical waveguide","authors":"Liu Yang, D. Dai, Jian-jun He, Sailing He","doi":"10.1364/ACP.2009.TUP4","DOIUrl":"https://doi.org/10.1364/ACP.2009.TUP4","url":null,"abstract":"The thermal nonlinear optical effect is observed in a microring resonator based on a small SU-8 polymer ridge optical waveguide. The resonant wavelength blue shifts almost linearly with a slope of about −0.8 pm/mW as the input power increases. The absorption mechanism is analyzed in detail.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124383706","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}
A novel soluble zinc phthalocyanine derivative was synthesized and characterized by infrared (IR) and electronic absorption spectra. Current-voltage characteristics of the films were measured and photoconductivity was increased by an order of magnitude compared with dark conductivity, which indicates the product is a promising functional material for photovoltaic cells.
{"title":"Synthesis and photoelectrical properties of Zinc phthalocyanine-bisphenol a epoxy derivative","authors":"Wanxi Cheng, Yue Shen, Fei Zheng, Feng Gu, Jiangcheng Zhang","doi":"10.1364/ACP.2009.WL49","DOIUrl":"https://doi.org/10.1364/ACP.2009.WL49","url":null,"abstract":"A novel soluble zinc phthalocyanine derivative was synthesized and characterized by infrared (IR) and electronic absorption spectra. Current-voltage characteristics of the films were measured and photoconductivity was increased by an order of magnitude compared with dark conductivity, which indicates the product is a promising functional material for photovoltaic cells.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124144456","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}
L. Wosinska, A. Jirattigalachote, P. Monti, A. Tzanakaki, K. Katrinis
Wavelength division multiplexing (WDM) technology is considered to be the ultimate answer to the rapidly growing capacity demand of next generation networks. Many routing and wavelength assignment (RWA) algorithms, proposed for lightpath provisioning, base their routing decisions on the availability of network resources, and assume that optical fibers and components are ideal. In reality, physical impairments degrade the quality of the optical signal propagating through fiber segments and optical components. To cope with this problem, Impairment Constraint Based Routing (ICBR) algorithms, that consider physical impairments during connection provisioning, are currently proposed to prevent selecting lightpaths with poor signal quality. However, these algorithms support only a single (highest) quality of transmission threshold, the same one for all connection requests. This does not fit well with the variety of services, with potentially disparate QoS requirements, that the next generation networks are expected to support. Consequently, the efficiency of network resource utilization is reduced. This paper demonstrates that a significant improvement, in terms of blocking probability, can be achieved when using an ICBR algorithm with differentiated physical layer constraints. Performance is compared with conventional impairment aware routing approaches when unprotected, shared path protected (SPP), and dedicated path protected (DPP) connection requests are considered. The achieved improvement is a result of more efficient resource utilization as unnecessary connection blocking can be avoided by selecting network resources offering optical signal quality that is “good enough”good enough to satisfy a specific connection request. to satisfy a specific connection request.
{"title":"Lightpath routing considering differentiated physical layer constraints in transparent WDM networks","authors":"L. Wosinska, A. Jirattigalachote, P. Monti, A. Tzanakaki, K. Katrinis","doi":"10.1364/ACP.2009.FG1","DOIUrl":"https://doi.org/10.1364/ACP.2009.FG1","url":null,"abstract":"Wavelength division multiplexing (WDM) technology is considered to be the ultimate answer to the rapidly growing capacity demand of next generation networks. Many routing and wavelength assignment (RWA) algorithms, proposed for lightpath provisioning, base their routing decisions on the availability of network resources, and assume that optical fibers and components are ideal. In reality, physical impairments degrade the quality of the optical signal propagating through fiber segments and optical components. To cope with this problem, Impairment Constraint Based Routing (ICBR) algorithms, that consider physical impairments during connection provisioning, are currently proposed to prevent selecting lightpaths with poor signal quality. However, these algorithms support only a single (highest) quality of transmission threshold, the same one for all connection requests. This does not fit well with the variety of services, with potentially disparate QoS requirements, that the next generation networks are expected to support. Consequently, the efficiency of network resource utilization is reduced. This paper demonstrates that a significant improvement, in terms of blocking probability, can be achieved when using an ICBR algorithm with differentiated physical layer constraints. Performance is compared with conventional impairment aware routing approaches when unprotected, shared path protected (SPP), and dedicated path protected (DPP) connection requests are considered. The achieved improvement is a result of more efficient resource utilization as unnecessary connection blocking can be avoided by selecting network resources offering optical signal quality that is “good enough”good enough to satisfy a specific connection request. to satisfy a specific connection request.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"69 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132418220","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 present fabrication and characterization of 1.3-µm InAs quantum dot (QD) vertical cavity surface emitting lasers (VCSELs) and QD-VCSEL arrays. The continuous-wave (CW) output power of single QD-VCSEL of 1.2 mW with lasing wavelength of 1.28 µm is obtained at room temperature (RT) at a bias current of 15 mA without power saturation. The low threshold current of 1.1 mA can be achieved for the single mode device. We investigate the 3-dB modulation bandwidth of QD-VCSELs with oxide aperture size of 5-µm, 10-µm and 15-µm in the small signal frequency response measurements. Modulation bandwidth of 2.65 GHz is achieved for single-mode QD-VCSEL with oxide aperture size of 5 µm at a bias current of 4.5 mA. The maximum modulation bandwidth of 2.5 GHz can be obtained for multimode QD-VCSEL with oxide aperture size of 10 µm at a bias current of 7 mA. The 61 QD-VCSELs array is also investigated at RT without optimization. Maximum CW output power of 28 mW and pulsed output power of 18 mW are demonstrated for 2-D QD-VCSEL array with threshold current of 50 mA. The far field pattern beam angle of QD-VCSEL arrays at two perpendicular directions are about 18 degree.
{"title":"Fabrication and characterization of 1.3-µm InAs quantum-dot VCSELs and monolithic VCSEL arrays","authors":"Y. Ding, W. Fan, D. Xu, L. Zhao, Y. Liu, N. Zhu","doi":"10.1364/ACP.2009.TUB2","DOIUrl":"https://doi.org/10.1364/ACP.2009.TUB2","url":null,"abstract":"We present fabrication and characterization of 1.3-µm InAs quantum dot (QD) vertical cavity surface emitting lasers (VCSELs) and QD-VCSEL arrays. The continuous-wave (CW) output power of single QD-VCSEL of 1.2 mW with lasing wavelength of 1.28 µm is obtained at room temperature (RT) at a bias current of 15 mA without power saturation. The low threshold current of 1.1 mA can be achieved for the single mode device. We investigate the 3-dB modulation bandwidth of QD-VCSELs with oxide aperture size of 5-µm, 10-µm and 15-µm in the small signal frequency response measurements. Modulation bandwidth of 2.65 GHz is achieved for single-mode QD-VCSEL with oxide aperture size of 5 µm at a bias current of 4.5 mA. The maximum modulation bandwidth of 2.5 GHz can be obtained for multimode QD-VCSEL with oxide aperture size of 10 µm at a bias current of 7 mA. The 61 QD-VCSELs array is also investigated at RT without optimization. Maximum CW output power of 28 mW and pulsed output power of 18 mW are demonstrated for 2-D QD-VCSEL array with threshold current of 50 mA. The far field pattern beam angle of QD-VCSEL arrays at two perpendicular directions are about 18 degree.","PeriodicalId":366119,"journal":{"name":"2009 Asia Communications and Photonics conference and Exhibition (ACP)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132041976","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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