The Experts below are selected from a list of 14877 Experts worldwide ranked by ideXlab platform
Xiaoming Xie - One of the best experts on this subject based on the ideXlab platform.
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sixteen channel Fiber Array coupled superconducting single photon detector Array with average system detection efficiency over 60 at telecom wavelength
Optics Letters, 2021Co-Authors: Weijun Zhang, Lixing You, Chengjun Zhang, Hao Huang, Xingqu Sun, Jiamin Xiong, Zhen Wang, Xiaoming XieAbstract:We report a compact, scalable, and high-performance superconducting nanowire single-photon detector (SNSPD) Array by using a multichannel optical Fiber Array-coupled configuration. For single pixels with an active area of 18 µm in diameter and illuminated at the telecom wavelength of 1550 nm, we achieved a pixel yield of 13/16 on one chip, an average system detection efficiency of 69% at a dark count rate of 160 cps, a minimum timing jitter of 74 ps, and a maximum count rate of ∼40Mcps. The optical crosstalk coefficient between adjacent channels is better than -60dB. The performance of the Fiber Array-coupled detectors is comparable with a standalone detector coupled to a single Fiber. Our method is promising for the development of scalable, high-performance, and high-yield SNSPDs.
Yongqiang Jiang - One of the best experts on this subject based on the ideXlab platform.
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OSA Title: Design of a Broadband Highly Dispersive Pure Silica Photonic Crystal Fiber Design of a Broadband Highly Dispersive Pure Silica Photonic Crystal Fiber
2020Co-Authors: Yongqiang Jiang, Harish Subbaraman, Tao Ling, Maggie Chen, Peiyan Cao, Ray Chen, Maggie Y ChenAbstract:A highly dispersive dual concentric core pure silica photonic crystal Fiber is designed with maximum chromatic dispersion value of about -9500 ps/(nm·km) around 1.56 µm wavelength region and a full width at half maximum (FWHM) of 55 nm. The change in the dispersion-bandwidth product as a function of period is carefully studied using plane wave expansion method. The coupled mode theory matches well with the plane wave expansion method that was used to simulate the chromatic dispersion. This kind of a photonic crystal Fiber structure is suitable for high dispersion application in photonic crystal Fiber Array based phased Array antenna systems
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dispersion enhanced photonic crystal Fiber Array for a true time delay structured x band phased Array antenna
IEEE Photonics Technology Letters, 2005Co-Authors: Yongqiang Jiang, Ray T Chen, Brie Howley, Zhong Shi, Qingjun Zhou, Maggie Y Chen, George A Brost, C LeeAbstract:Tunable optical true time-delay modules based on highly dispersive photonic crystal Fibers (PCFs) are demonstrated to provide continuous radio-frequency squint-free beam scanning for an X-band (8-12 GHz) phased Array antenna system. The dispersion of the fabricated PCF is as high as -600 ps/nm /spl middot/ km at 1550 nm. The time delay is continuously tunable from -31 to 31 ps between adjacent delay lines by tuning the laser wavelength continuously from 1528 to 1560 nm. The far field radiation patterns of a 1/spl times/4 subArray were measured from -45/spl deg/ to 45/spl deg/ scanning angles. Squint-free operation is experimentally confirmed.
Hao Huang - One of the best experts on this subject based on the ideXlab platform.
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sixteen channel Fiber Array coupled superconducting single photon detector Array with average system detection efficiency over 60 at telecom wavelength
Optics Letters, 2021Co-Authors: Weijun Zhang, Lixing You, Chengjun Zhang, Hao Huang, Xingqu Sun, Jiamin Xiong, Zhen Wang, Xiaoming XieAbstract:We report a compact, scalable, and high-performance superconducting nanowire single-photon detector (SNSPD) Array by using a multichannel optical Fiber Array-coupled configuration. For single pixels with an active area of 18 µm in diameter and illuminated at the telecom wavelength of 1550 nm, we achieved a pixel yield of 13/16 on one chip, an average system detection efficiency of 69% at a dark count rate of 160 cps, a minimum timing jitter of 74 ps, and a maximum count rate of ∼40Mcps. The optical crosstalk coefficient between adjacent channels is better than -60dB. The performance of the Fiber Array-coupled detectors is comparable with a standalone detector coupled to a single Fiber. Our method is promising for the development of scalable, high-performance, and high-yield SNSPDs.
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demonstration of a 280 gbit s free space space division multiplexing communications link utilizing plane wave spatial multiplexing
Optics Letters, 2016Co-Authors: Martin P J Lavery, Hao Huang, Alan E WillnerAbstract:We demonstrate a 280 Gbit/s free-space space-division-multiplexing communications link incorporating a set of independent tilted truncated plane-waves, each generated by a single mode Fiber placed at the back-focal plane of a spherical lens. Each of the seven tilted plane-wave channels are encoded with a 40 Gbit/s 16-QAM signal. Our approach comprises two identical linear Fiber-Arrays placed approximately 5 m apart. As each Fiber Array is placed at the back-focal-plane of a spherical lens, each Fiber Array is effectively placed in a conjugate image plane of the other. A channel crosstalk of less than 26 dB is shown, with a bit-error-rate below the FEC threshold of 3.8×10−3.
Victor I. Kopp - One of the best experts on this subject based on the ideXlab platform.
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Two-Dimensional, 37-Channel, High-Bandwidth, Ultra-Dense Silicon Photonics Optical Interface
Journal of Lightwave Technology, 2015Co-Authors: Victor I. Kopp, Pieter Dumon, Jongchul Park, Mitchell Wlodawski, Eric E. Hubner, Jonathan Singer, Dan Neugroschl, Azriel Z. Genack, Joris Van Campenhout, Philippe AbsilAbstract:We demonstrate a hexagonal, monolithic optical Fiber Array matched to 37 vertical grating couplers with 40-μm pitch for a silicon photonics optical interface with standard deviation of coupling across all channels of 0.7 dB.
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multichannel high bandwidth coupling of ultradense silicon photonic waveguide Array to standard pitch Fiber Array
Journal of Lightwave Technology, 2011Co-Authors: Fuad E Doany, Jonathan Singer, Benjamin G Lee, Solomon Assefa, William M J Green, Min Yang, Clint L Schow, Christopher V Jahnes, Sheng Zhang, Victor I. KoppAbstract:A multichannel tapered coupler interfacing standard 250-μm-pitch low-numerical-aperture (NA) polarization-maintaining Fiber Arrays with ultradense 20- μm-pitch high-NA silicon waveguides is designed and fabricated. The coupler is based on an Array of 12 dual-core glass waveguides on 250-μ m pitch that are tapered to a 20- μm pitch, simultaneously providing both pitch and spot-size conversion. At the wide end, the inner core matches the NA and mode profile of standard single-mode Fiber. When drawn and tapered, the inner core “vanishes” and the outer core, surrounded by the clad, matches the NA and mode profile of the on-chip photonic waveguide. Ultradense high-efficiency coupling to an Array of Si photonic waveguides is demonstrated using a 12-channel polarization-maintaining-Fiber pigtailed tapered coupler. Coupling to Si waveguides is facilitated using SiON spot-size converters integrated into the Si photonic IC to provide 2-3-μm mode field diameters compatible with the tapered coupler. The tapered coupler achieves <; 1 dB coupling losses to photonic waveguides. Furthermore, eight-channel coupling is shown with less than -35 dB crosstalk between channels. Finally, a 640-Gb/s wavelength-division-multiplexing signal is coupled into four waveguides occupying 80 μm of chip edge, providing 160-Gb/s per-channel bandwidths.
Shawn L Macmurphy - One of the best experts on this subject based on the ideXlab platform.
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the optical Fiber Array bundle assemblies for the nasa lunar reconnaissance orbiter evaluation lessons learned for flight implementation from the nasa electronic parts and packaging program
Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 2017Co-Authors: Robert Switzer, Frank Larocca, Richard F. Chuska, William Joe Thomes, Shawn L MacmurphyAbstract:The United States, National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC), Fiber Optics Team in the Electrical Engineering Division of the Applied Engineering and Technology Directorate, designed, developed and integrated the space flight optical Fiber Array hardware assemblies for the Lunar Reconnaissance Orbiter (LRO). The two new assemblies that were designed and manufacturing at NASA GSFC for the LRO exist in configurations that are unique in the world for the application of ranging and lidar. These assemblies were developed in coordination with Diamond Switzerland, and the NASA GSFC Mechanical Systems Division. The assemblies represent a strategic enhancement for NASA’s Laser Ranging and Laser Radar (LIDAR) instrument hardware by allowing light to be moved to alternative locations that were not feasible in past space flight implementations. An account will be described of the journey and the lessons learned from design to integration for the Lunar Orbiter Laser Altimeter and the Laser Ranging Application on the LRO. The LRO is scheduled to launch end of 2008.
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the optical Fiber Array bundle assemblies for the nasa lunar reconnaissance orbiter
2008Co-Authors: Robert Switzer, Frank Larocca, Richard F. Chuska, William Joe Thomes, Shawn L MacmurphyAbstract:The United States, National Aeronautics and Space Administration (NASA) Goddard Space Flight Center (GSFC), Fiber Optics Team in the Electrical Engineering Division of the Applied Engineering and Technology Directorate, designed, developed and integrated the space flight optical Fiber Array hardware assemblies for the Lunar Reconnaissance Orbiter (LRO). The two new assemblies that were designed and manufactured at NASA GSFC for the LRO exist in configurations that are unique in the world for the application of ranging and lidar. These assemblies were developed in coordination with Diamond Switzerland, and the NASA GSFC Mechanical Systems Division. The assemblies represent a strategic enhancement for NASA's Laser Ranging and Laser Radar (LIDAR) instrument hardware by allowing light to be moved to alternative locations that were not feasible in past space flight implementations. An account will be described of the journey and the lessons learned from design to integration for the Lunar Orbiter Laser Altimeter and the Laser Ranging Application on the LRO. The LRO is scheduled to launch end of 2008.
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development qualification and integration of the optical Fiber Array assemblies for the lunar reconnaissance orbiter
Proceedings of SPIE, 2008Co-Authors: Robert Switzer, Frank Larocca, Richard F. Chuska, William Joe Thomes, Shawn L MacmurphyAbstract:The NASA Goddard Fiber Optics Team in the Electrical Engineering Division of the Applied Engineering and Technology Directorate designed, developed and integrated the space flight optical Fiber Array hardware for the Lunar Reconnaissance Orbiter (LRO). The two new assemblies that were designed and manufactured at GSFC for the LRO exist in configurations that are unique in the world for the application of ranging and LIDAR. Described here is an account of the journey and the lessons learned from design to integration for the Lunar Orbiter Laser Altimeter and the Laser Ranging Application on the LRO.
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space flight qualification on a novel five Fiber Array assembly for the lunar orbiter laser altimeter lola at nasa goddard space flight center
Proceedings of SPIE, 2007Co-Authors: Xiaodan Linda Jin, Frank Larocca, Shawn L Macmurphy, Steve Schmidt, Richard F. Chuska, William Joe Thomes, Melanie N. Ott, Adam Matuszeski, Robert SwitzerAbstract:A novel multi-mode 5-Fiber Array assembly was developed, manufactured, characterized and then qualified for the Lunar Orbiter Laser Altimeter (LOLA). LOLA is a science data gathering instrument used for lunar topographical mapping located aboard the Lunar Reconnaissance Orbiter (LRO) mission. This LRO mission is scheduled for launch sometime in late 2008. The Fiber portion of the Array assembly was comprised of step index 200/220μm multi-mode optical Fiber with a numerical aperture of 0.22. Construction consisted of five Fibers inside of a single polarization maintaining (PM) Diamond AVIM connector. The PM construction allows for a unique capability allowing the Array side to be "clocked" to a desired angle of degree. The Array side "fans-out" to five individual standard Diamond AVIM connectors. In turn, each of the individual standard AVIM connectors is then connected to five separate detectors. The qualification test plan was designed to best replicate the aging process during launch and long term space flight environmental exposure. The characterization data presented here includes results from: vibration testing, thermal performance characterization, and radiation testing.
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requirements validation testing on the 7 optical Fiber Array connector cable assemblies for the lunar reconnaissance orbiter lro
Proceedings of SPIE, 2007Co-Authors: Frank Larocca, Richard F. Chuska, Adam Matuszeski, Shawn L MacmurphyAbstract:In the past year, a unique capability has been created by NASA Goddard Space Flight Center (GSFC) in support of Lunar Exploration. The photonics group along with support from the Mechanical Systems Division, developed a seven Fiber Array assembly using a custom Diamond AVIM PM connector for space flight applications. This technology enabled the Laser Ranging Application for the LRO to be possible. Laser pulses at 532 nm will be transmitted from the earth to the LRO stationed at the moon and used to make distance assessments. The pulses will be collected with the Laser Ranging telescope and focused into the Array assemblies. The Array assemblies span down a boom, through gimbals and across the space craft to the instrument the Lunar Orbiter Laser Altimeter (LOLA). Through use of a LOLA detector the distance between the LRO and the Earth will be calculated simultaneously while LOLA is mapping the surface of the moon. The seven Fiber Array assemblies were designed in partnership with W.L. Gore, Diamond Switzerland, and GSFC, manufactured by the Photonics Group at NASA Goddard Space Flight Center (GSFC) and tested for environmental effects there as well. Presented here are the requirements validation testing and results used to insure that these unique assemblies would function adequately during the Laser Ranging 14-month mission. The data and results include in-situ monitoring of the optical assemblies during cold gimbal motion life-testing, radiation, vibration and thermal testing.