The Experts below are selected from a list of 2520 Experts worldwide ranked by ideXlab platform
S Bose - One of the best experts on this subject based on the ideXlab platform.
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towards mitigating the effect of sine gaussian noise transients on searches for gravitational waves from compact binary coalescences
Physical Review D, 2016Co-Authors: S Bose, S Dhurandhar, A Gupta, A P LundgrenAbstract:Gravitational wave signals were recently detected directly by LIGO from the coalescences of two stellar mass black hole pairs. These detections have strengthened our long held belief that compact binary coalescences (CBCs) are the most promising gravitational wave detection prospects accessible to ground-based interferometric detectors. For detecting CBC signals, it is of vital importance to characterize and identify non-Gaussian and nonstationary noise in these detectors. In this work, we model two important classes of transient artifacts that contribute to this noise and adversely affect the detector sensitivity to CBC signals. One of them is the sine-Gaussian ``glitch,'' characterized by a central frequency ${f}_{0}$ and a quality factor $Q$ and the other is the Chirping sine-Gaussian glitch, which is characterized by ${f}_{0}$, $Q$ as well as a Chirp Parameter. We study the response that a bank of compact binary inspiral templates has to these two families of glitches when they are used to match filter data containing any of these glitches. Two important characteristics of this response are the distributions of the signal-to-noise ratio and the time lag (i.e., how long after the occurrence of a glitch the signal-to-noise ratio of a trigger arises from its matched filtering by a template peaks) of individual templates. We show how these distributions differ from those when the detector data has a real CBC signal instead of a glitch. We argue that these distinctions can be utilized to develop useful signal-artifact discriminators that add negligibly to the computational cost of a CBC search. Specifically, we show how the central frequency of a glitch can be used to set adaptive time windows around it so that any template trigger occurring in that window can be quarantined for further vetting of its supposed astrophysical nature. Second, we recommend focusing efforts on reducing the incidence of glitches with low central-frequency values because they create CBC triggers with the longest time lags. This work allows us to associate such triggers with the glitches that otherwise would have escaped attention.
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towards mitigating the effect of sine gaussian noise transients on searches for gravitational waves from compact binary coalescences
Physical Review D, 2016Co-Authors: S Bose, S Dhurandhar, A Gupta, A P LundgrenAbstract:Gravitational wave (GW) signals were recently detected directly by LIGO from the coalescences of two black hole pairs. These detections have strengthened our belief that compact binary coalescences (CBCs) are the most promising GW detection prospects accessible to ground-based interferometric detectors. For detecting CBC signals it is of vital importance to characterize and identify non-Gaussian and non-stationary noise in these detectors. In this work we model two important classes of transient artifacts that contribute to this noise and adversely affect the detector sensitivity to CBC signals. One of them is the sine-Gaussian glitch, characterized by a central frequency $f_0$ and a quality factor $Q$ and the other is the Chirping sine-Gaussian glitch, which is characterized by $f_0$, $Q$ as well as a Chirp Parameter. We study the response a bank of compact binary inspiral templates has to these two families of glitches when they are used to match-filter data containing any of these glitches. Two important characteristics of this response are the distributions of the signal-to-noise ratio and the timelag of individual templates. We show how these distributions differ from those when the detector data has a real CBC signal instead of a glitch. We argue that these distinctions can be utilized to develop useful signal-artifact vetos that add negligibly to the computational cost of a CBC search. Specifically, we show how $f_0$ of a glitch can be used to set adaptive time-windows around it so that any template trigger occurring in that window can be quarantined for further vetting of its supposed astrophysical nature. Second, we recommend focusing efforts on reducing the incidence of glitches with low $f_0$ values because they create CBC triggers with the longest timelags. This work allows us to associate such triggers with the glitches which otherwise would have escaped attention.
A P Lundgren - One of the best experts on this subject based on the ideXlab platform.
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towards mitigating the effect of sine gaussian noise transients on searches for gravitational waves from compact binary coalescences
Physical Review D, 2016Co-Authors: S Bose, S Dhurandhar, A Gupta, A P LundgrenAbstract:Gravitational wave signals were recently detected directly by LIGO from the coalescences of two stellar mass black hole pairs. These detections have strengthened our long held belief that compact binary coalescences (CBCs) are the most promising gravitational wave detection prospects accessible to ground-based interferometric detectors. For detecting CBC signals, it is of vital importance to characterize and identify non-Gaussian and nonstationary noise in these detectors. In this work, we model two important classes of transient artifacts that contribute to this noise and adversely affect the detector sensitivity to CBC signals. One of them is the sine-Gaussian ``glitch,'' characterized by a central frequency ${f}_{0}$ and a quality factor $Q$ and the other is the Chirping sine-Gaussian glitch, which is characterized by ${f}_{0}$, $Q$ as well as a Chirp Parameter. We study the response that a bank of compact binary inspiral templates has to these two families of glitches when they are used to match filter data containing any of these glitches. Two important characteristics of this response are the distributions of the signal-to-noise ratio and the time lag (i.e., how long after the occurrence of a glitch the signal-to-noise ratio of a trigger arises from its matched filtering by a template peaks) of individual templates. We show how these distributions differ from those when the detector data has a real CBC signal instead of a glitch. We argue that these distinctions can be utilized to develop useful signal-artifact discriminators that add negligibly to the computational cost of a CBC search. Specifically, we show how the central frequency of a glitch can be used to set adaptive time windows around it so that any template trigger occurring in that window can be quarantined for further vetting of its supposed astrophysical nature. Second, we recommend focusing efforts on reducing the incidence of glitches with low central-frequency values because they create CBC triggers with the longest time lags. This work allows us to associate such triggers with the glitches that otherwise would have escaped attention.
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towards mitigating the effect of sine gaussian noise transients on searches for gravitational waves from compact binary coalescences
Physical Review D, 2016Co-Authors: S Bose, S Dhurandhar, A Gupta, A P LundgrenAbstract:Gravitational wave (GW) signals were recently detected directly by LIGO from the coalescences of two black hole pairs. These detections have strengthened our belief that compact binary coalescences (CBCs) are the most promising GW detection prospects accessible to ground-based interferometric detectors. For detecting CBC signals it is of vital importance to characterize and identify non-Gaussian and non-stationary noise in these detectors. In this work we model two important classes of transient artifacts that contribute to this noise and adversely affect the detector sensitivity to CBC signals. One of them is the sine-Gaussian glitch, characterized by a central frequency $f_0$ and a quality factor $Q$ and the other is the Chirping sine-Gaussian glitch, which is characterized by $f_0$, $Q$ as well as a Chirp Parameter. We study the response a bank of compact binary inspiral templates has to these two families of glitches when they are used to match-filter data containing any of these glitches. Two important characteristics of this response are the distributions of the signal-to-noise ratio and the timelag of individual templates. We show how these distributions differ from those when the detector data has a real CBC signal instead of a glitch. We argue that these distinctions can be utilized to develop useful signal-artifact vetos that add negligibly to the computational cost of a CBC search. Specifically, we show how $f_0$ of a glitch can be used to set adaptive time-windows around it so that any template trigger occurring in that window can be quarantined for further vetting of its supposed astrophysical nature. Second, we recommend focusing efforts on reducing the incidence of glitches with low $f_0$ values because they create CBC triggers with the longest timelags. This work allows us to associate such triggers with the glitches which otherwise would have escaped attention.
C Cuadradolaborde - One of the best experts on this subject based on the ideXlab platform.
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experimental demonstration of fractional order differentiation using a long period grating based in fiber modal interferometer
Optics Communications, 2016Co-Authors: L Povedawong, Antonio Carrascosa, C Cuadradolaborde, J L Cruz, M V AndresAbstract:Abstract In this work we demonstrate both, experimentally and theoretically, that a long-period grating-based in-fiber modal interferometer can perform an all-optical arbitrary-order fractional differentiation. Experimentally, we fractionally differentiated to the 0.5th order a secant hyperbolic-like pulse of 23 ps time width provided by a 1039.5 nm emission wavelength modelocked fiber laser, with a Chirp Parameter of −30. An analytical expression relating the fractional order of differentiation n with the characteristics of the modal interferometer was also derived, with the purpose to simplify the design procedure. The proposal was corroborated also numerically. This device may find applications in real time phase recovery.
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long period grating assisted fractional differentiation of highly Chirped light pulses
Optics Communications, 2016Co-Authors: L Povedawong, Antonio Carrascosa, C Cuadradolaborde, A Diez, J L Cruz, M V AndresAbstract:Abstract We experimentally demonstrate the possibility to perform a fractional differentiation of arbitrary order on a given light pulse by propagation through a single long-period grating. A simple analytical expression is obtained also, relating the fractional order of differentiation with the Parameters of the long-period grating. A secant hyperbolic like pulse of 23 ps time width with a Chirp Parameter of −30 was successfully fractionally differentiated to the 0.5th order. The proposal was corroborated experimentally and numerically. The device may find applications in real time phase recovery.
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periodic pulse train conformation based on the temporal radon wigner transform
Optics Communications, 2007Co-Authors: C Cuadradolaborde, Pablo A Costanzocaso, Ricardo Duchowicz, Enrique E SicreAbstract:Abstract By using the Radon–Wigner transform (RWT), we analyze the temporal selfimaging or Talbot effect for producing well-conformed pulse trains with variable repetition rates and duty-cycles. The relationships linking the selfimaging conditions with the fractional orders of the RWT are first obtained for unChirped pulse trains. Then, we extend the analysis to Chirped pulse sequences by deriving the conditions to be fulfilled by an equivalent unChirped pulse train producing the same selfimage irradiances. This result becomes relevant for observing well-defined high order fractional selfimaging, which are of interest due to their repetition rate multiplication. Besides, the effect of the finite extension of the pulse train on the selfimage quality is analyzed and a condition is found for relating the required minimum pulse number with the Chirp Parameter of the pulses.
John E Bowers - One of the best experts on this subject based on the ideXlab platform.
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thermally insensitive determination of the Chirp Parameter of inas gaas quantum dot lasers epitaxially grown onto silicon
Novel In-Plane Semiconductor Lasers XVIII, 2019Co-Authors: Jianan Duan, John E Bowers, Heming Huang, Bozhang Dong, Daehwan Jung, Zeyu Zhang, Justin Norman, Frederic GrillotAbstract:A common way of extracting the Chirp Parameter (i.e., the α-factor) of semiconductor lasers is usually performed by extracting the net modal gain and the wavelength from the amplified spontaneous emission (ASE) spectrum. Although this method is straightforward, it remains sensitive to the thermal effects hence leading to a clear underestimation of the α-factor. In this work, we investigate the Chirp Parameter of InAs/GaAs quantum dot (QD) lasers epitaxially grown on silicon with a measurement technique evaluating the gain and wavelength changes of the suppressed side modes by optical injection locking. Given that the method is thermally insensitive, the presented results confirm our initial measurements conducted with the ASE i.e. the α-factor of the QD lasers directly grown on silicon is as low as 0.15 hence resulting from the low threading dislocation density and high material gain of the active region. These conclusions make such lasers very promising for future integrated photonics where narrow linewidth, feedback resistant and low-Chirp on-chip transmitters are required.
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self calibrated microwave characterization of high speed optoelectronic devices by heterodyne spectrum mapping
Journal of Lightwave Technology, 2017Co-Authors: Shangjian Zhang, Heng Wang, Yali Zhang, Chong Zhang, John E BowersAbstract:A four-in-one electrical method is proposed based on heterodyne spectrum mapping for self-calibrated frequency response measurements of high-speed semiconductor laser diodes, Mach–Zehnder modulators, phase modulators, and photodetectors with a shared self-heterodyne interferometer. The self-heterodyne interferometer provides mapping of the desired optical spectrum components from the optical domain to electrical domain, and allows indirect but self-calibrated measurement of these optical spectra in the electrical domain. Frequency responses including modulation index of semiconductor laser diodes, half-wave voltage and Chirp Parameter of Mach–Zehnder modulators, half-wave voltage of phase modulators, and responsivity of photodetectors are experimentally extracted with this method, and compared to the results obtained with conventional methods for accuracy.
M V Andres - One of the best experts on this subject based on the ideXlab platform.
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experimental demonstration of fractional order differentiation using a long period grating based in fiber modal interferometer
Optics Communications, 2016Co-Authors: L Povedawong, Antonio Carrascosa, C Cuadradolaborde, J L Cruz, M V AndresAbstract:Abstract In this work we demonstrate both, experimentally and theoretically, that a long-period grating-based in-fiber modal interferometer can perform an all-optical arbitrary-order fractional differentiation. Experimentally, we fractionally differentiated to the 0.5th order a secant hyperbolic-like pulse of 23 ps time width provided by a 1039.5 nm emission wavelength modelocked fiber laser, with a Chirp Parameter of −30. An analytical expression relating the fractional order of differentiation n with the characteristics of the modal interferometer was also derived, with the purpose to simplify the design procedure. The proposal was corroborated also numerically. This device may find applications in real time phase recovery.
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long period grating assisted fractional differentiation of highly Chirped light pulses
Optics Communications, 2016Co-Authors: L Povedawong, Antonio Carrascosa, C Cuadradolaborde, A Diez, J L Cruz, M V AndresAbstract:Abstract We experimentally demonstrate the possibility to perform a fractional differentiation of arbitrary order on a given light pulse by propagation through a single long-period grating. A simple analytical expression is obtained also, relating the fractional order of differentiation with the Parameters of the long-period grating. A secant hyperbolic like pulse of 23 ps time width with a Chirp Parameter of −30 was successfully fractionally differentiated to the 0.5th order. The proposal was corroborated experimentally and numerically. The device may find applications in real time phase recovery.