2016

• Record 13 of
  
  Title:Thin film wavelength converters for photonic integrated circuits
  
  Author(s):Chang, Lin(1); Li, Yifei(1); Volet, Nicolas(1); Wang, Leiran(1,2); Peters, Jon(1); Bowers, John E.(1)
  Source: Optica  Volume: 3  Issue: 5  DOI: 10.1364/OPTICA.3.000531  Published: May 20, 2016  
  Abstract:Quasi-phase-matched (QPM) wavelength converters are highly desirable for emerging nonlinear optics applications in photonic integrated circuits, but available waveguide and quasi-phase-matching technologies have so far constrained their realization. In this work, we present a periodically poled lithium niobate (LN) waveguide on a silicon nitride-thin film LN platform. It contains a submicrometer waveguide core for enhancing nonlinear interactions that is more than one order of magnitude smaller than those of previous QPM waveguides. Periodic poling was applied directly to the thin film LN for quasi-phase-matching by a new surface poling technology. We demonstrated 160% W-1 · cm-2 normalized efficiency for second harmonic generation at 1530 nm with ultralow propagation loss (0.3 dB/cm) in the telecom band. This highly efficient and compact wavelength converter has the potential for straightforward integration with various photonic platforms, e.g., on-chip microsystems such as optical communication networks, quantum storage, and optical frequency referencing. © 2016 Optical Society of America.
  Accession Number: 20173204035082
• Record 14 of
  
  Title:An Orthogonal Method for Measurement Matrix Optimization
  
  Author(s):Pan, Jinfeng(1,2,3); Qiu, Yuehong(1)
  Source: Circuits, Systems, and Signal Processing  Volume: 35  Issue: 3  DOI: 10.1007/s00034-015-0107-4  Published: March 1, 2016  
  Abstract:Compressive sensing theory states that signals can be sampled at a much smaller rate than that required by the Nyquist sampling theorem, because the sampling of a signal in the former is performed as a relatively small number of its linear measurements. Thus, the design of a measurement matrix is important in compressive sensing framework. A random measurement matrix optimization method is proposed in this study based on the incoherence principle of compressive sensing, which requires the mutual coherence of information operator to be small. The columns with mutual coherence are orthogonalized iteratively to decrease the mutual coherence of the information operator. The orthogonalization is realized by replacing the columns with the orthogonal matrix (Formula presented.) of their QR factorization. An information operator with smaller mutual coherence is acquired after the optimization, leading to an improved measurement matrix in terms of its relationship with the information operator. Results of several experiments show that the improved measurement matrix can reduce its mutual coherence with dictionaries compared with the random measurement matrix. The signal reconstruction error also decreases when the optimized measurement matrix is utilized. © 2015, Springer Science+Business Media New York.
  Accession Number: 20160801981523
• Record 15 of
  
  Title:Research progress of magneto-optical property of chalcogenide glasses
  
  Author(s):Chen, Gang(1,2); Xu, Yantao(1,3); Guo, Haitao(1); Lu, Min(1); Yu, Fengxia(2); Xiao, Xusheng(1,3); Peng, Bo(1)
  Source: Cailiao Daobao/Materials Review  Volume: 30  Issue: 10  DOI: 10.11896/j.issn.1005-023X.2016.19.012  Published: October 10, 2016  
  Abstract:Recently, the magneto-optical chalcogenide glasses have attracted great interest in the field of magneto-optical materials owing to their excellent properties, including but not limited to the independence of Verdet constant to temperature, easy fabrication of optical fiber and optical waveguide, etc. The progress in investigation and development of magneto-optical properties in chalcogenide glasses is systematically introduced. Meanwhile, the factors that influence the Verdet constant of chalcogenide glasses are analyzed in detail. In addition, the possible development direction for chalcogenide glass is discussed. © 2016, Materials Review Magazine. All right reserved.
  Accession Number: 20165003129450
• Record 16 of
  
  Title:Nanosecond passively mode-locked laser with a hundred megahertz spectral bandwidth
  
  Author(s):Kues, Michael(1); Reimer, Christian(1); Wetzel, Benjamin(1,2); Roztocki, Piotr(1); Little, Brent E.(3); Chu, Sai T.(4); Moss, David J.(1,5); Morandotti, Roberto(1)
  Source: Optics InfoBase Conference Papers  Volume:   Issue:   DOI: 10.1364/FIO.2016.JTh2A.192  Published: 2016  
  Abstract:We demonstrate a passively mode-locked laser emitting 4.3 nanosecond quasi-Fourierlimited pulses with a record low (104.9 MHz) spectral bandwidth. The laser relies on the simultaneous nested-cavity filtering and cavity-enhanced nonlinear interactions within an integrated microring resonator. © OSA 2016.
  Accession Number: 20171503548041
• Record 17 of
  
  Title:Effect of the gradient constant temperature on the electrochemical capacitance of cotton stalk-based activated carbon
  
  Author(s):Li, Wenlong(1,2); Wumaier, Tuerdi(3); Chen, Mingde(1); Zhang, Ji(3); Liu, Huan(1,2); Yang, Li Qing(1); Wang, Haojing(1)
  Source: Journal of Solid State Electrochemistry  Volume: 20  Issue: 8  DOI: 10.1007/s10008-016-3235-2  Published: August 1, 2016  
  Abstract:The cost-effective activated carbon based from waste cotton stalks by the KOH activation method is investigated as the electrode material in supercapacitor for the first time. Activation temperature control is one of the most important factors affecting the surface area and pore structure of activated carbon, and it influences the capacitive performance of activated carbon based from cotton stalk. The optimized conditions are as follows: cotton stalk base charcoals and activating agent with a mass ration of 1:4, at an activation temperature of 600, 700, and 800°C for 1, 1, and 2 h, respectively. With these experimental conditions, the activated carbon presents excellent electrochemical characteristics. The specific capacitance of the prepared activated carbon was as high as 180 F g−1at 2 A g−1 in 1.0 mol·L−1 Et4NBF4/AN electrolyte and the specific capacitance without obvious attenuation after 2000 cycles. So, it is reasonable to believe that the activated carbons from cotton stalks by the KOH gradient constant temperature activation method might be one of the innovative carbon electrode materials for supercapacitor. © 2016, Springer-Verlag Berlin Heidelberg.
  Accession Number: 20162202445119
• Record 18 of
  
  Title:Micro-resonator frequency comb source based time domain Hilbert transform
  
  Author(s):Shoeiby, Mehrdad(1); Nguyen, Thach G.(1); Schröeder, Jochen(1); Chu, Sai T.(2); Little, Brent E.(3); Morandotti, Roberto(4); Mitchell, Arnan(1,5); Moss, David J.(6)
  Source: Optics InfoBase Conference Papers  Volume:   Issue:   DOI: 10.1364/iprsn.2016.iw2a.4  Published: 2016  
  Abstract:We demonstrate a temporal Hilbert transformer based on an integrated microresonator optical frequency comb source, and perform a temporal transform of a Gaussian pulse with a fullwidth half maximum of 0.12ns. © OSA 2016.
  Accession Number: 20171403515705
• Record 19 of
  
  Title:On-chip Generation of Four-Photon Entangled Qubit States
  
  Author(s):Reimer, Christian(1); Kues, Michael(1); Roztocki, Piotr(1); Caspani, Lucia(1,2); Bromberg, Yaron(3); Wetzel, Benjamin(1); Little, Brent E.(4); Chu, Sai T.(5); Moss, David J.(1,6); Morandotti, Roberto(1)
  Source: Optics InfoBase Conference Papers  Volume:   Issue:   DOI:   Published: 2016  
  Abstract:We demonstrate four-photon entangled qubits generated from an integrated quantum frequency comb source. This is confirmed by four-photon quantum interference with a visibility above 89%, and quantum state tomography revealing a fidelity above 64%. © OSA 2016.
  Accession Number: 20223512636763
• Record 20 of
  
  Title:Temporal Hilbert transform based on an integrated frequency comb source
  
  Author(s):Shoeiby, Mehrdad(1); Nguyen, Thach G.(1); Schroeder, Jochen(1); Chu, Sai T.(2); Little, Brent E.(3); Morandotti, Roberto(4); Mitchell, Arnan(1,5); Moss, David J.(6)
  Source: 2016 Conference on Lasers and Electro-Optics, CLEO 2016  Volume:   Issue:   DOI: 10.1364/cleo_si.2016.sf1g.1  Published: December 16, 2016  
  Abstract:An experimentally demonstrated temporal Hilbert transformer based on an integrated optical frequency comb source is exploited to obtain the temporal Hilbert transform of a Gaussian pulse with a full-width half maximum duration of 0.12ns. © 2016 OSA.
  Accession Number: 20170503301144
• Record 21 of
  
  Title:On-chip generation of four-photon entangled qubit states
  
  Author(s):Reimer, Christian(1); Kues, Michael(1); Roztocki, Piotr(1); Caspani, Lucia(1,2); Bromberg, Yaron(3); Wetzel, Benjamin(1); Little, Brent E.(4); Chu, Sai T.(5); Moss, David J.(1,6); Morandotti, Roberto(1)
  Source: 2016 Conference on Lasers and Electro-Optics, CLEO 2016  Volume:   Issue:   DOI: 10.1364/cleo_qels.2016.fm2n.1  Published: December 16, 2016  
  Abstract:We demonstrate four-photon entangled qubits generated from an integrated quantum frequency comb source. This is confirmed by four-photon quantum interference with a visibility above 89%, and quantum state tomography revealing a fidelity above 64%. © 2016 OSA.
  Accession Number: 20170503300924
• Record 22 of
  
  Title:Demonstration of flexible optical time-division multiplexing system for high-speed free-space optical communications
  
  Author(s):Hu, Hui(1,2,3); Qian, Fengchen(1,2); Xie, Xiaoping(1); Duan, Tao(1); Feng, Huan(1,2)
  Source: Journal of Optics (India)  Volume: 45  Issue: 1  DOI: 10.1007/s12596-016-0318-5  Published: March 1, 2016  
  Abstract:A high-speed free-space optical communication scheme based on optical time-division multiplexing (OTDM) is experimentally demonstrated. By multiplexing eight 2.5Gb/s base-rate signals, which is generated from a repetition-tunable actively mode-locked fiber ring laser modulated by pseudo-random binary sequence data stream, a 20Gb/s OTDM packet is obtained. After 50 m high-speed FSO system transmission, the 20Gb/s OTDM packet is injected into a highly nonlinear fiber (HNLF) loop to realize polarization-insensitive de-multiplexing based on four-wave mixing (FWM). Experimental results show that the OTDM de-multiplexer bit error rate (BER) can achieve 10−9 level with steady operation over 24 h, proving the practicality of this system. © 2016, The Optical Society of India.
  Accession Number: 20160601897838
• Record 23 of
  
  Title:Four-photon entanglement generation with integrated optical frequency combs
  
  Author(s):Reimer, Christian(1); Kues, Michael(1); Roztocki, Piotr(1); Caspani, Lucia(1,2); Bromberg, Yaron(3); Wetzel, Benjamin(1); Little, Brent E.(4); Chu, Sai T.(5); Moss, David J.(1,6); Morandotti, Roberto(1)
  Source: Optics InfoBase Conference Papers  Volume:   Issue:   DOI: 10.1364/iprsn.2016.iw3a.5  Published: 2016  
  Abstract:We demonstrate the generation of four-photon entangled quantum states with integrated optical frequency comb sources. We measure four-photon quantum interference with a visibility above 89%, and perform quantum state tomography revealing a fidelity above 64%. © OSA 2016.
  Accession Number: 20171403515616
• Record 24 of
  
  Title:Multi-photon entangled quantum state from integrated optical frequency combs
  
  Author(s):Reimer, Christian(1); Kues, Michael(1); Roztocki, Piotr(1); Caspani, Lucia(1,2); Bromberg, Yaron(3); Wetzel, Benjamin(1); Little, Brent E.(4); Chu, Sai T.(5); Moss, David J.(1,6); Morandotti, Roberto(1)
  Source: Optics InfoBase Conference Papers  Volume:   Issue:   DOI: 10.1364/LAOP.2016.LTh2B.2  Published: August 15, 2016  
  Abstract:We show the generation of four-photon entangled quantum states exploiting spontaneous four-wave mixing and the multi-mode characteristic of integrated micro-resonators. This is confirmed by four-photon quantum interference and quantum state tomography. © OSA 2016.
  Accession Number: 20171503549319