The Experts below are selected from a list of 10236 Experts worldwide ranked by ideXlab platform
Stojan Radic - One of the best experts on this subject based on the ideXlab platform.
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phase preserving parametric wavelength conversion to swir band in highly nonlinear dispersion stabilized fiber
Optics Express, 2013Co-Authors: F Gholami, Nikola Alic, Sanja Zlatanovic, Stojan RadicAbstract:The first successful translation of a phase Modulated Optical Signal over 80 THz, from the near infrared to the short-wave infrared (SWIR) band is demonstrated. A Signal, phase-Modulated at 10 Gbps, was received in an error-free manner in the SWIR(1.7–2.2 μm) band. A new class of highly nonlinear fiber with reduced dispersion fluctuation was utilized as the platform for this phase-preserving distant parametric conversion.
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400 ns continuously tunable delay of 10 gb s intensity Modulated Optical Signal
IEEE Photonics Technology Letters, 2009Co-Authors: Evgeny Myslivets, Nikola Alic, Joshua Ray Windmiller, R M Jopson, Stojan RadicAbstract:A continuously tunable Optical delay line based on a two-pump parametric process in a highly nonlinear fiber providing 400.5-ns range for a 10-Gb/s Optical Signal is reported. This record 4005-bit delay used fixed dispersion elements, compatible with requirements for fast delay reconfiguration. The large delay range was made possible by partial dispersion slope cancelation.
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720-ns Continuously Tunable Parametric Delay of a 10-Gb/s Optical Signal
IEEE Photonics Technology Letters, 2009Co-Authors: S. Moro, Nikola Alic, Evgeny Myslivets, J.x. Zhao, A.j. Anderson, J.m. Aparicio, J.b. Coles, J. M. Chavez Boggio, Stojan RadicAbstract:We report a record 720-ns continuously tunable Optical delay of a 10-Gb/s intensity-Modulated Optical Signal, using a two-pump parametric process. Error-free performance is achieved over the entire 7200-bit delay range. The input and output wavelengths were identical, as is required for most applications.
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Translation of Gbps Phase-Modulated Optical Signal From Near-Infrared to Visible Band
Journal of Lightwave Technology, 2008Co-Authors: Rui Jiang, Nikola Alic, Evgeny Myslivets, Camille-sophie Brès, Stojan RadicAbstract:Phase-coded Optical Signal was spectrally translated from the conventional near-infrared communication band to the visible band. Spectrally narrow 780-nm pump was combined with phase-Modulated 1575-nm Signal in a small core photonic crystal fiber (PCF), to generate 518-nm idler through parametric process. The phase-Modulated idler carrying 1-Gbps information was received in an error-free manner. The onset of the stimulated Brillouin scattering (SBS) was found to be a major limitation for conversion efficiency and noise performance. The SBS effect and the birefringence properties of the small core PCF were studied at both 780 and 1550 nm and their impact on the parametric process was analyzed.
Lihong V Wang - One of the best experts on this subject based on the ideXlab platform.
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Frequency-Swept Ultrasound-Modulated Optical Tomography
Advances in Optical Imaging and Photon Migration, 1998Co-Authors: Lihong V WangAbstract:A novel frequency-swept (chirped) ultrasound Modulated Optical tomography technique was developed to image scattering media. Laser light was Modulated by a frequency-swept ultrasonic wave to add spatial information to the Modulated Optical Signal. The Modulated Optical Signal was received by a photomultiplier tube and was heterodyned with a reference modulation Signal. Frequency analysis was employed to obtain spatial resolution along the ultrasonic axis. A spectrum can be converted to a ID image. Multiple spectra were obtained and were used to form a 2D image of the scattering medium.
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Turbid acousto-optics and its potential for biomedical applications
Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging , 1997Co-Authors: Lihong V WangAbstract:Continuous-wave ultrasonic modulation of scattered laser light has been used to image objects in tissue-simulating turbid media for the first time. The Modulated laser light collected by a photomultiplier tube reflected the local mechanical and Optical properties in the modulation zone. Buried objects in 5-cm thick tissue phantoms were imaged with millimeter resolution by scanning and detecting alterations of the ultrasound-Modulated Optical Signal. The tissue phantoms had the following Optical properties: absorption coefficient /spl mu//sub a/=0.1 cm/sup -1/, reduced scattering coefficient /spl mu//sub s/'=10 cm/sup -1/, which are comparable with those of biological tissues in the visible and near IR range. This technique is merely a representation of a much broader discipline coined turbid acousto-optics, which means acousto-optics in turbid media.
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Ultrasound-Modulated Optical tomography of absorbing objects buried in dense tissue-simulating turbid media
Applied optics, 1997Co-Authors: Lihong V Wang, Xuemei ZhaoAbstract:Continuous-wave ultrasonic modulation of scattered laser light was used to image objects buried in tissue-simulating turbid media. The buried object had an absorption coefficient greater than the background turbid medium. The ultrasonic wave that was focused into the turbid media Modulated the laser light that passed through the ultrasonic field. The Modulated laser light that was collected by a photomultiplier tube reflected the local mechanical and Optical properties in the zone of ultrasonic modulation. Objects buried in the middle plane of 5-cm-thick dense turbid media were imaged with millimeter resolution through the scanning and detecting alterations of the ultrasound-Modulated Optical Signal. The Optical properties of the dense turbid media included an absorption coefficient of 0.1 cm-1 and a reduced scattering coefficient of 10 cm-1 and were comparable with those of biological tissues in the visible and near-IR ranges. The dependence of the ultrasound-Modulated Optical Signal on the off-axis distance of the detector from the optic axis and the area of the detector was studied as well.
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continuous wave ultrasonic modulation of scattered laser light to image objects in turbid media
Optics Letters, 1995Co-Authors: Lihong V Wang, Steven L Jacques, Xuemei ZhaoAbstract:Continuous-wave ultrasonic modulation of scattered laser light has been used to image objects in tissue-simulating turbid media for what is to our knowledge the first time. The ultrasound wave focused into the turbid media modulates the laser light passing through the ultrasonic focal zone. The Modulated laser light collected by a photomultiplier tube reflects the local mechanical and Optical properties in the focal zone. Buried objects are located with millimeter resolution by scanning and detecting alterations of the Modulated Optical Signal. This technique has the potential to provide a noninvasive, nonionizing, inexpensive diagnostic tool for diseases such as breast cancer.
A J Seeds - One of the best experts on this subject based on the ideXlab platform.
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millimeter wave Modulated Optical Signal generation with high spectral purity and wide locking bandwidth using a fiber integrated Optical injection phase lock loop
IEEE Photonics Technology Letters, 2000Co-Authors: L A Johansson, A J SeedsAbstract:We report the first experimental demonstration of millimeter-wave Modulated Optical Signal generation by an Optical injection phase-lock loop. A 36-GHz Signal was generated by combining Optical sideband injection locking with Optical phase-lock loop techniques for two fiber-coupled DFB lasers. Single sideband noise spectral density of -92 dBc/Hz at 10 kHz offset, and phase-error variance lower than 0.005 rad/sup 2/ in a 100 MHz bandwidth were measured. The locking bandwidth exceeded 30 GHz.
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high spectral purity millimetre wave Modulated Optical Signal generation using fibre grating lasers
International Microwave Symposium, 1998Co-Authors: F N Timofeev, A J Seeds, S Bennett, R A Griffin, P Bayvel, R Wyatt, Raman Kashyap, M J RobertsonAbstract:Millimetre-wave Optical Signal generation by heterodyning two semiconductor fibre grating lasers is demonstrated for the first time. The resulting beat Signal, has an extremely narrow linewidth (<100 kHz), is continuously tuneable (0-40 GHz) and exhibits negligible chirp under direct 2.6 Gbit/s modulation.
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high spectral purity millimetre wave Modulated Optical Signal generation using fibre grating lasers
Electronics Letters, 1998Co-Authors: F N Timofeev, A J Seeds, S Bennett, R A Griffin, P Bayvel, R Wyatt, Raman Kashyap, M J RobertsonAbstract:Millimetre-wave Optical Signal generation by heterodyning two fibre grating lasers is demonstrated. The resulting beat Signal has an extremely narrow linewidth (< 50 kHz), is continuously tunable (0 – 40 GHz) and exhibits negligible chirp under direct 2.6 Gbit/s modulation.
Xuemei Zhao - One of the best experts on this subject based on the ideXlab platform.
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Ultrasound-Modulated Optical tomography of absorbing objects buried in dense tissue-simulating turbid media
Applied optics, 1997Co-Authors: Lihong V Wang, Xuemei ZhaoAbstract:Continuous-wave ultrasonic modulation of scattered laser light was used to image objects buried in tissue-simulating turbid media. The buried object had an absorption coefficient greater than the background turbid medium. The ultrasonic wave that was focused into the turbid media Modulated the laser light that passed through the ultrasonic field. The Modulated laser light that was collected by a photomultiplier tube reflected the local mechanical and Optical properties in the zone of ultrasonic modulation. Objects buried in the middle plane of 5-cm-thick dense turbid media were imaged with millimeter resolution through the scanning and detecting alterations of the ultrasound-Modulated Optical Signal. The Optical properties of the dense turbid media included an absorption coefficient of 0.1 cm-1 and a reduced scattering coefficient of 10 cm-1 and were comparable with those of biological tissues in the visible and near-IR ranges. The dependence of the ultrasound-Modulated Optical Signal on the off-axis distance of the detector from the optic axis and the area of the detector was studied as well.
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continuous wave ultrasonic modulation of scattered laser light to image objects in turbid media
Optics Letters, 1995Co-Authors: Lihong V Wang, Steven L Jacques, Xuemei ZhaoAbstract:Continuous-wave ultrasonic modulation of scattered laser light has been used to image objects in tissue-simulating turbid media for what is to our knowledge the first time. The ultrasound wave focused into the turbid media modulates the laser light passing through the ultrasonic focal zone. The Modulated laser light collected by a photomultiplier tube reflects the local mechanical and Optical properties in the focal zone. Buried objects are located with millimeter resolution by scanning and detecting alterations of the Modulated Optical Signal. This technique has the potential to provide a noninvasive, nonionizing, inexpensive diagnostic tool for diseases such as breast cancer.
R A Minasian - One of the best experts on this subject based on the ideXlab platform.
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microwave photonic Signal processing
Optics Express, 2013Co-Authors: R A Minasian, Erwin H W ChanAbstract:Photonic Signal processing offers the advantages of large time-bandwidth capabilities to overcome inherent electronic limitations. In-fibre Signal processors are inherently compatible with fibre optic microwave systems that can integrate with wireless antennas, and can provide connectivity with in-built Signal conditioning and electromagnetic interference immunity. Recent methods in wideband and adaptive Signal processing, which address the challenge of realising programmable microwave photonic phase shifters and true-time delay elements for phased array beamforming; ultra-wideband Hilbert transformers; single passband, widely tunable, and switchable microwave photonic filters; and ultra-wideband microwave photonic mixers, are described. In addition, a new microwave photonic mixer structure is presented, which is based on using the inherent frequency selectivity of the stimulated Brillouin scattering loss spectrum to suppress the carrier of a dual-phase Modulated Optical Signal. Results for the new microwave photonic mixer demonstrate an extremely wide bandwidth operation of 0.2 to 20 GHz and a large conversion efficiency improvement compared to the conventional microwave photonic mixer.
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widely tunable single passband microwave photonic filter based on stimulated brillouin scattering
IEEE Photonics Technology Letters, 2011Co-Authors: Weiwei Zhang, R A MinasianAbstract:A new ultrawide continuously tunable single-passband microwave photonic filter with very high resolution, is presented. It is based on a stimulated Brillouin scattering technique using a phase Modulated Optical Signal and a dual-sideband suppressed-carrier pump. Results are presented which demonstrate a 1- to 20-GHz measured tuning range, together with continuous tuning, extremely high resolution with a -3-dB bandwidth of only 20 MHz, a single passband, shape-invariant tuning, and a high out-of-band rejection of 31 dB.