2017
2017
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Record 493 of
Title:A sCMOS camera and its tests for focal plane metrology and PSF centroiding experiment
Author(s):Li, Haitao(1,2,4); Li, Baoquan(1,2,3); Cao, Yang(1,2,3); Li, Ligang(3,4); Yang, Jianfeng(3,5); Ge, Wei(5); Lv, Baogang(5); Tao, Jinyou(5)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 10255 Issue: DOI: 10.1117/12.2268565 Published: 2017Abstract:In this paper, the feasibility of a sCMOS camera for astrometric exoplanet detection space mission was evaluated and the evaluation methods were also studied. A 2k x 2k single-chip sCMOS camera was installed on the metrology testbed for the space mission. The pixel size of the detector is 11μm, corresponding to 1.86 arcsec on the focal plane. The sCMOS camera runs with a electronic rolling shutter. We tested the performance of the camera in detail, including the gain, linearity, readout noise, dark current, pixel response non-uniformity, etc. The data acquisition performance for the pseudo-star and the interference fringes are also studied. ? 2017 SPIE.Accession Number: 20171403514881 -
Record 494 of
Title:Imaging through a scattering medium based on spatial transmission matrix
Author(s):Zhuang, Bin(1,2); Xu, Chengfang(1,2); Geng, Yi(1,2); Zhao, Guangzhi(1,2); Zhou, Libin(3); He, Zhengquan(1); Ren, Liyong(1)Source: Optics InfoBase Conference Papers Volume: Part F61-ECBO 2017 Issue: DOI: 10.1117/12.2285014 Published: 2017Abstract:The inhomogeneity of scattering medium distorts the propagation of the waves, which has been detrimental to the performance of optical imaging. The operating time of the traditional solutions will be very long as the scanning is necessary during the imaging. A recovery solution based on spatial optical transmission matrix has been proposed. With the acquiring of the spatial optical transmission matrix, the incident object wave will be recovered directly from the distorted transmitted wave, in this way, only a single shot is needed during the imaging. The effectiveness of this method has been proved by the simulation and experiment, the principle is simpler and the algorithm is more efficient, which are beneficial to the imaging through the scattering medium. ? 2017 SPIE-OSA.Accession Number: 20174404326316 -
Record 495 of
Title:Filter-driven four wave mixing laser with a controllable repetition rate
Author(s):Cooper, Andrew(1); Bao, Hualong(1); Di Lauro, Luigi(1); Rowley, Maxwell(1); Chu, Sai T.(2); Little, Brent E.(3); Morandotti, Roberto(4); Moss, David J.(5); Peccianti, Marco(1); Pasquazi, Alessia(1)Source: Optics InfoBase Conference Papers Volume: Part F52-IPRSN 2017 Issue: DOI: 10.1364/IPRSN.2017.IM4A.2 Published: 2017Abstract:We demonstrate a robust control over the repetition rate of a micro-comb laser by using the Filter-Driven Four Wave Mixing scheme. Results show that the coherence can be kept during the whole process. ? OSA 2017.Accession Number: 20173404078688 -
Record 496 of
Title:Type II micro-comb based on a filter-driven four wave mixing laser
Author(s):Bao, Hualong(1); Cooper, Andrew(1); Chu, Sai T.(2); Moss, Dave J.(3); Morandotti, Roberto(4); Little, Brent E.(5); Peccianti, Marco(1); Pasquazi, Alessia(1)Source: Optics InfoBase Conference Papers Volume: Part F52-IPRSN 2017 Issue: DOI: 10.1364/IPRSN.2017.IM4A.4 Published: 2017Abstract:We numerically and experimentally demonstrate the generation of Type II micro-combs in a Filter-Driven four wave mixing laser, showing that the generated Type II micro-combs are fully coherent. ? OSA 2017.Accession Number: 20173404078690 -
Record 497 of
Title:3?W narrow-linewidth ultra-short wavelength operation near 1707?nm in thulium-doped silica fiber laser with bidirectional pumping
Author(s):Xiao, Xusheng(1,2); Guo, Haitao(1); Yan, Zhijun(1); Wang, Hushan(1); Xu, Yantao(1); Lu, Min(1); Wang, Yishan(1); Peng, Bo(1)Source: Applied Physics B: Lasers and Optics Volume: 123 Issue: 4 DOI: 10.1007/s00340-017-6713-z Published: April 1, 2017Abstract:We have developed an ultra-short wavelength operation of all-fiber Tm-doped laser system, in which the laser system was structured in a FBGs based linear cavity with FBG associated bidirectional pump mechanism at 1550?nm. The laser yielded 3.15?W of continuous-wave output at 1706.75?nm with a narrow-linewidth of ~50?pm. A high reflectivity FBG (HR-FBG) at 1550?nm was used to reflect the residual pump light and achieve the bidirectional pump mechanism. The maximum slope efficiency was improved from 23.2% without HR-FBG to 42.1% with HR-FBG at 1550?nm and the lowest pump threshold was reduced from 1.6 to 0.8?W accordingly. In the experiment, we have also investigated the dependencies of the slope efficiencies and pump threshold of the laser versus the length of active fiber and reflectivity of the output mirror (FBG) in detail. It is indisputable that the development of 1.7?μm silicate fiber lasers with Watt-level output power will open up a number of promising application windows. ? 2017, Springer-Verlag Berlin Heidelberg.Accession Number: 20171503564241 -
Record 498 of
Title:Photonic microwave and RF signal processing based on optical micro-combs
Author(s):Xu, Xingyuan(1); Wu, Jiayang(1); Shoeiby, Mehrdad(2); Chu, Sai T.(3); Little, Brent E.(4); Morandotti, Roberto(5); Mitchell, Arnan(2); Moss, David J.(1)Source: Progress in Electromagnetics Research Symposium Volume: 2017-November Issue: DOI: 10.1109/PIERS-FALL.2017.8293510 Published: 2017Abstract:We demonstrate the use of integrated micro-resonator based optical frequency comb sources as the basis for transversal filtering functions for microwave and radio frequency photonic filtering and advanced functions. ? 2018 Electromagnetics Academy. All rights reserved.Accession Number: 20181605018231 -
Record 499 of
Title:Frequency comb assisted characterisation of a filter-driven four wave mixing laser
Author(s):Cooper, Andrew(1); Bao, Hualong(1); Rowley, Maxwell(1); Chu, Sai T.(2); Moss, Dave J.(3); Morandotti, Roberto(4); Little, Brent E.(5); Peccianti, Marco(1); Pasquazi, Alessia(1)Source: Optics InfoBase Conference Papers Volume: Part F82-CLEO_Europe 2017 Issue: DOI: Published: 2017Abstract:nullAccession Number: 20180104612714 -
Record 500 of
Title:When Collaboration Hugs Intelligence: Content Delivery over Ultra-Dense Networks
Author(s):Zhou, Liang(1); Wu, Dan(2); Dong, Zhenjiang(3); Li, Xuelong(4)Source: IEEE Communications Magazine Volume: 55 Issue: 12 DOI: 10.1109/MCOM.2017.1700481 Published: December 2017Abstract:With the increasing popularity of traffic-intensive video applications, UDNs are treated as one of the most promising technologies for massive video delivery. However, due to the drastic interference between neighboring cells, how to achieve high energy and spectrum efficiency is still an open and challenging problem. This work proposes a systematic solution for content delivery over UDNs by integrating collaboration with intelligence. In particular, we first design a hybrid video coding scheme that is flexible and robust to the dynamic wireless environment. Then an active and proactive video update strategy is designed by intelligently alleviating the impact of the interference. Finally, a collaborative video scheduling scheme is developed to maximize the video quality as well as the energy and spectrum efficiency. Importantly, we summarize three fundamental design guidelines, and believe that they are useful for improving the transmission capacity of UDNs. ? 1979-2012 IEEE.Accession Number: 20180204625245 -
Record 501 of
Title:Microwave and RF applications of micro-combs
Author(s):Xu, Xingyuan(1); Wu, Jiayang(1); Shoeiby, Mehrdad(2); Chu, Sai T.(3); Little, Brent E.(4); Morandotti, Roberto(5); Mitchell, Arnan(2); Moss, David J.(1)Source: 2017 Opto-Electronics and Communications Conference, OECC 2017 and Photonics Global Conference, PGC 2017 Volume: 2017-November Issue: DOI: 10.1109/OECC.2017.8115044 Published: November 17, 2017Abstract:We demonstrate the use of integrated micro-resonator based optical frequency comb sources as the basis for transversal filtering functions for microwave and radio frequency photonic filtering and advanced functions. ? 2017 IEEE.Accession Number: 20182405306595 -
Record 502 of
Title:NIR 3D GISC lidar on a balloon-borne platform
Author(s):Wang, Chenglong(1,2); Mei, Xiaodong(1,2); Pan, Long(1,2); Wang, Pengwei(1,2); Li, Wang(1); Gao, Xin(1); Xie, Meilin(3); Han, Junfeng(3); Zhang, Hui(2,4); Bo, Zunwang(1); Chen, Mingliang(1); Gong, Wenling(1); Han, Shensheng(1)Source: Optics InfoBase Conference Papers Volume: Part F44-3D 2017 Issue: DOI: 10.1364/3D.2017.JTu5A.11 Published: 2017Abstract:The first NIR 3D GISC lidar on a balloon-borne platform is reported in this paper. Experimental results demonstrate that both the transverse and range resolutions of better than 0:5m at over 1km hight can be achieved by this lidar even under middle turbulence weather conditions, which suggests its great prospect in remote sensing application. ? 2016 OSA.Accession Number: 20173103999046 -
Record 503 of
Title:NIR 3D GISC Lidar on a Balloon-borne Platform
Author(s):Wang, Chenglong(1,2); Mei, Xiaodong(1,2); Pan, Long(1,2); Wang, Pengwei(1,2); Li, Wang(1); Gao, Xin(1); Xie, Meilin(3); Han, Junfeng(3); Zhang, Hui(2,4); Bo, Zunwang(1); Chen, Mingliang(1); Gong, Wenling(1); Han, Shensheng(1)Source: Optics InfoBase Conference Papers Volume: Issue: DOI: Published: 2017Abstract:The first NIR 3D GISC lidar on a balloon-borne platform is reported in this paper. Experimental results demonstrate that both the transverse and range resolutions of better than 0:5m at over 1km hight can be achieved by this lidar even under middle turbulence weather conditions, which suggests its great prospect in remote sensing application. ? 2017 Optical Society of America.Accession Number: 20223512633818 -
Record 504 of
Title:Reconfigurable microwave photonic transversal filter based on an integrated Kerr comb
Author(s):Xu, Xingyuan(1); Wu, Jiayang(1); Nguyen, Thach G.(2); Shoeiby, Mehrdad(2); Chu, Sai T.(3); Little, Brent E.(4); Morandotti, Roberto(5); Mitchell, Arnan(2); Moss, David J.(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 10456 Issue: DOI: 10.1117/12.2283456 Published: 2017Abstract:A reconfigurable microwave photonic filter (MPF) based on an integrated Kerr comb source was proposed and demonstrated. By employing an on-chip micro-ring resonator (MRR), a broadband Kerr comb with a large number of comb lines was generated and used as a high-quality multi-wavelength source for the MPF, which greatly reduced the size and cost. The enhanced performance of the MPF was theoretically analysed and systematically characterized. Due to the large channel number and high reconfigurability of the scheme, the MPF features an improved Q factor and wideband tunability. The experimental results matches well with theory, verifying the feasibility of our approach as a solution towards implementing highly reconfigurable MPFs with reduced system complexity. ? COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.Accession Number: 20180404671641