The Experts below are selected from a list of 41910 Experts worldwide ranked by ideXlab platform
Toshihiko Hirooka - One of the best experts on this subject based on the ideXlab platform.
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distortion free optical transmission using time domain optical Fourier Transformation and transform limited optical pulses
Journal of The Optical Society of America B-optical Physics, 2005Co-Authors: Masataka Nakazawa, Toshihiko HirookaAbstract:A method for distortion-free optical pulse transmission is theoretically proposed that employs optical Fourier Transformation and Fourier transform-limited (TL) pulses. With this technique, a Fourier TL pulse is used as an input signal. By noting that a Gaussian TL pulse has a Gaussian spectrum, the unchanged spectrum of the TL pulse after transmission is converted into the time domain using optical Fourier Transformation. Thus the transformed waveform in the time domain has no distortion as long as the transmitted spectral envelope is not changed owing to the perturbations.
Bahram Jalali - One of the best experts on this subject based on the ideXlab platform.
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Dispersive Fourier Transformation for fast continuous single-shot measurements
Nature Photonics, 2013Co-Authors: Keisuke Goda, Bahram JalaliAbstract:It's challenging to measure non-repetitive events in real time in the field of instrumentation and measurement. Dispersive Fourier Transformation is an emerging method that permits capture of rare events, such as optical rogue waves and rare cancer cells in blood. This Review article covers the principle of dispersive Fourier Transformation and its implementation in diverse applications.
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Dispersive Fourier Transformation and Application to Cancer Detection
Frontiers in Optics 2013, 2013Co-Authors: Keisuke Goda, Bahram Jalali, Kazuki Hashimoto, Shunnosuke Ueno, Shunya YamadaAbstract:We discuss the principle and biomedical utility of dispersive Fourier Transformation - a method that maps the spectrum of a pulse into a temporal waveform whose intensity mimics the spectrum for fast continuous single-shot spectroscopic measurements.
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noise figure of amplified dispersive Fourier Transformation
Physical Review A, 2010Co-Authors: Keisuke Goda, Bahram JalaliAbstract:Amplified dispersive Fourier Transformation (ADFT) is a powerful tool for fast real-time spectroscopy as it overcomes the limitations of traditional optical spectrometers. ADFT maps the spectrum of an optical pulse into a temporal waveform using group-velocity dispersion and simultaneously amplifies it in the optical domain. It greatly simplifies spectroscopy by replacing the diffraction grating and detector array in the conventional spectrometer with a dispersive fiber and single-pixel photodetector, enabling ultrafast real-time spectroscopic measurements. Following our earlier work on the theory of ADFT, here we study the effect of noise on ADFT. We derive the noise figure of ADFT and discuss its dependence on various parameters.
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theory of amplified dispersive Fourier Transformation
Physical Review A, 2009Co-Authors: Keisuke Goda, D R Solli, Kevin K Tsia, Bahram JalaliAbstract:Amplified dispersive Fourier Transformation (ADFT) is a powerful technique that maps the spectrum of an optical pulse into a time-domain waveform using group-velocity dispersion (GVD) and simultaneously amplifies it in the optical domain. It replaces a diffraction grating and detector array with a dispersive fiber and single photodetector, greatly simplifying the system and, more importantly, enabling ultrafast real-time spectroscopic measurements. Here we present a theory of ADFT by deriving the general equation and spectral resolution for ADFT and studying the evolution of the pulse spectrum into time, the effect of GVD coefficients on ADFT, and the requirement for dispersion. This theory is expected to lend valuable insights into the process and implementation of ADFT.
John T Sheridan - One of the best experts on this subject based on the ideXlab platform.
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optical operations on wave functions as the abelian subgroups of the special affine Fourier Transformation
Optics Letters, 1994Co-Authors: Sumiyoshi Abe, John T SheridanAbstract:The special affine Fourier Transformation (SAFT) is a generalization of the fractional Fourier Transformation (FRT) and represents the most general lossless inhomogeneous linear mapping, in phase space, as the integral Transformation of a wave function. Here we first summarize the most well-known optical operations on light-wave functions (i.e., the FRT, lens Transformation, free-space propagation, and magnification), in a unified way, from the viewpoint of the one-parameter Abelian subgroups of the SAFT. Then we present a new operation, which is the Lorentz-type hyperbolic Transformation in phase space and exhibits squeezing. We also show that the SAFT including these five operations can be generated from any two independent operations.
Masataka Nakazawa - One of the best experts on this subject based on the ideXlab platform.
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distortion free optical transmission using time domain optical Fourier Transformation and transform limited optical pulses
Journal of The Optical Society of America B-optical Physics, 2005Co-Authors: Masataka Nakazawa, Toshihiko HirookaAbstract:A method for distortion-free optical pulse transmission is theoretically proposed that employs optical Fourier Transformation and Fourier transform-limited (TL) pulses. With this technique, a Fourier TL pulse is used as an input signal. By noting that a Gaussian TL pulse has a Gaussian spectrum, the unchanged spectrum of the TL pulse after transmission is converted into the time domain using optical Fourier Transformation. Thus the transformed waveform in the time domain has no distortion as long as the transmitted spectral envelope is not changed owing to the perturbations.
Keisuke Goda - One of the best experts on this subject based on the ideXlab platform.
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Dispersive Fourier Transformation for fast continuous single-shot measurements
Nature Photonics, 2013Co-Authors: Keisuke Goda, Bahram JalaliAbstract:It's challenging to measure non-repetitive events in real time in the field of instrumentation and measurement. Dispersive Fourier Transformation is an emerging method that permits capture of rare events, such as optical rogue waves and rare cancer cells in blood. This Review article covers the principle of dispersive Fourier Transformation and its implementation in diverse applications.
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Dispersive Fourier Transformation and Application to Cancer Detection
Frontiers in Optics 2013, 2013Co-Authors: Keisuke Goda, Bahram Jalali, Kazuki Hashimoto, Shunnosuke Ueno, Shunya YamadaAbstract:We discuss the principle and biomedical utility of dispersive Fourier Transformation - a method that maps the spectrum of a pulse into a temporal waveform whose intensity mimics the spectrum for fast continuous single-shot spectroscopic measurements.
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noise figure of amplified dispersive Fourier Transformation
Physical Review A, 2010Co-Authors: Keisuke Goda, Bahram JalaliAbstract:Amplified dispersive Fourier Transformation (ADFT) is a powerful tool for fast real-time spectroscopy as it overcomes the limitations of traditional optical spectrometers. ADFT maps the spectrum of an optical pulse into a temporal waveform using group-velocity dispersion and simultaneously amplifies it in the optical domain. It greatly simplifies spectroscopy by replacing the diffraction grating and detector array in the conventional spectrometer with a dispersive fiber and single-pixel photodetector, enabling ultrafast real-time spectroscopic measurements. Following our earlier work on the theory of ADFT, here we study the effect of noise on ADFT. We derive the noise figure of ADFT and discuss its dependence on various parameters.
-
theory of amplified dispersive Fourier Transformation
Physical Review A, 2009Co-Authors: Keisuke Goda, D R Solli, Kevin K Tsia, Bahram JalaliAbstract:Amplified dispersive Fourier Transformation (ADFT) is a powerful technique that maps the spectrum of an optical pulse into a time-domain waveform using group-velocity dispersion (GVD) and simultaneously amplifies it in the optical domain. It replaces a diffraction grating and detector array with a dispersive fiber and single photodetector, greatly simplifying the system and, more importantly, enabling ultrafast real-time spectroscopic measurements. Here we present a theory of ADFT by deriving the general equation and spectral resolution for ADFT and studying the evolution of the pulse spectrum into time, the effect of GVD coefficients on ADFT, and the requirement for dispersion. This theory is expected to lend valuable insights into the process and implementation of ADFT.