The Experts below are selected from a list of 5991 Experts worldwide ranked by ideXlab platform
Szymon Suckewer - One of the best experts on this subject based on the ideXlab platform.
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Compression of laser pulses by near-forward Raman Amplification in plasma
Physics of Plasmas, 2020Co-Authors: Q. Chen, A. Morozov, Szymon SuckewerAbstract:We propose a new scheme for compression of ultrashort laser pulses enabled by Near-Forward Raman Amplification (NFRA) in plasma. In contrast to traditional forward Raman Amplification in plasma, the seed pulse in NFRA propagates faster than the pump through manipulation of the spatiotemporal properties of the pump beam. A “π-pulse” solution similar to that of stimulated Raman backscattering Amplification is obtained, indicating that NFRA can be used for compression of ultrashort laser pulses. NFRA is numerically demonstrated with a 2D simulation using a front-tilt near-forward pump pulse.We propose a new scheme for compression of ultrashort laser pulses enabled by Near-Forward Raman Amplification (NFRA) in plasma. In contrast to traditional forward Raman Amplification in plasma, the seed pulse in NFRA propagates faster than the pump through manipulation of the spatiotemporal properties of the pump beam. A “π-pulse” solution similar to that of stimulated Raman backscattering Amplification is obtained, indicating that NFRA can be used for compression of ultrashort laser pulses. NFRA is numerically demonstrated with a 2D simulation using a front-tilt near-forward pump pulse.
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Raman Amplification of Laser Pulses in Microcapillary Plasmas
AIP Conference Proceedings, 2002Co-Authors: Y Ping, Nathaniel J. Fisch, A. Morozov, I Geltner, Szymon SuckewerAbstract:Raman Amplification of ultrashort pulses is demonstrated in microcapillary plasmas. Experiments in very short microcapillaries (0.2 – 0.5 mm) with a broadband seed pulse show that the Amplification factor is in agreement with the linear growth rate.
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Raman Amplification of ultrashort laser pulses in microcapillary plasmas.
Physical review. E Statistical nonlinear and soft matter physics, 2002Co-Authors: Y Ping, A. Morozov, I Geltner, N J Fisch, Szymon SuckewerAbstract:Experimental evidences of Raman Amplification of ultrashort pulses in microcapillary plasmas are presented. The Amplification of 100-500 fs pulses was investigated in microcapillaries with different lengths. The experimental data, together with simulation results, indicate that the resonance condition for Raman Amplification in high-density plasma, n(e) approximately 1-3x10(20) cm(-3), existed only in a very short plasma column. Such an assumption makes it possible to reconcile the experimental results and theoretical predictions. Investigations in very short microcapillaries (0.2-0.5 mm) with a broadband seed pulse further support this hypothesis and the Amplification factor is in agreement with the linear growth rate.
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Raman Amplification of ultrashort laser pulses in microcapillary plasmas.
Physical Review E, 2002Co-Authors: Y Ping, A. Morozov, I Geltner, N J Fisch, Szymon SuckewerAbstract:Experimental evidences of Raman Amplification of ultrashort pulses in microcapillary plasmas are presented. The Amplification of 100\char21{}500 fs pulses was investigated in microcapillaries with different lengths. The experimental data, together with simulation results, indicate that the resonance condition for Raman Amplification in high-density plasma, ${n}_{e}\ensuremath{\sim}1\ensuremath{-}3\ifmmode\times\else\texttimes\fi{}{10}^{20}{\mathrm{cm}}^{\ensuremath{-}3},$ existed only in a very short plasma column. Such an assumption makes it possible to reconcile the experimental results and theoretical predictions. Investigations in very short microcapillaries (0.2\char21{}0.5 mm) with a broadband seed pulse further support this hypothesis and the Amplification factor is in agreement with the linear growth rate.
Paul Harper - One of the best experts on this subject based on the ideXlab platform.
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Transmission performance improvement using random DFB laser based Raman Amplification and bidirectional second-order pumping.
Optics express, 2016Co-Authors: M. Tan, Muhammad Azhar Iqbal, I. D. Phillips, Son Thai Le, P. Di Rosa, Paul HarperAbstract:We demonstrate that a distributed Raman Amplification scheme based on random distributed feedback (DFB) fiber laser enables bidirectional second-order Raman pumping without increasing relative intensity noise (RIN) of the signal. This extends the reach of 10 × 116 Gb/s DP-QPSK WDM transmission up to 7915 km, compared with conventional Raman Amplification schemes. Moreover, this scheme gives the longest maximum transmission distance among all the Raman Amplification schemes presented in this paper, whilst maintaining relatively uniform and symmetric signal power distribution, and is also adjustable in order to be highly compatible with different nonlinearity compensation techniques, including mid-link optical phase conjugation (OPC) and nonlinear Fourier transform (NFT).
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extended reach of 116 gb s dp qpsk transmission using random dfb fiber laser based Raman Amplification and bidirectional second order pumping
Optical Fiber Communication Conference, 2015Co-Authors: M. Tan, P. Di Rosa, Ian Phillips, Paul HarperAbstract:We propose a novel random DFB fiber laser based Raman Amplification using bidirectional second-order pumping. This extends the reach of 116 Gb/s DP-QPSK WDM transmission up to 7915 km, compared with other Raman Amplification techniques.
M. Tan - One of the best experts on this subject based on the ideXlab platform.
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Transmission performance improvement using random DFB laser based Raman Amplification and bidirectional second-order pumping.
Optics express, 2016Co-Authors: M. Tan, Muhammad Azhar Iqbal, I. D. Phillips, Son Thai Le, P. Di Rosa, Paul HarperAbstract:We demonstrate that a distributed Raman Amplification scheme based on random distributed feedback (DFB) fiber laser enables bidirectional second-order Raman pumping without increasing relative intensity noise (RIN) of the signal. This extends the reach of 10 × 116 Gb/s DP-QPSK WDM transmission up to 7915 km, compared with conventional Raman Amplification schemes. Moreover, this scheme gives the longest maximum transmission distance among all the Raman Amplification schemes presented in this paper, whilst maintaining relatively uniform and symmetric signal power distribution, and is also adjustable in order to be highly compatible with different nonlinearity compensation techniques, including mid-link optical phase conjugation (OPC) and nonlinear Fourier transform (NFT).
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extended reach of 116 gb s dp qpsk transmission using random dfb fiber laser based Raman Amplification and bidirectional second order pumping
Optical Fiber Communication Conference, 2015Co-Authors: M. Tan, P. Di Rosa, Ian Phillips, Paul HarperAbstract:We propose a novel random DFB fiber laser based Raman Amplification using bidirectional second-order pumping. This extends the reach of 116 Gb/s DP-QPSK WDM transmission up to 7915 km, compared with other Raman Amplification techniques.
Vahid Ahmadi - One of the best experts on this subject based on the ideXlab platform.
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Enhanced Raman Amplification by conventional and hybrid photonic crystal based ring structure
Optical and Quantum Electronics, 2016Co-Authors: Amire Seyedfaraji, Vahid AhmadiAbstract:In this paper, we present new structures based on ring, conventional photonic crystal and hybrid PhC for enhanced Raman Amplification. The structures consist of two separate entrances for the pump and signal. In this way, only pump is coupled into the ring and signal passes through the amplified pump without creating coupling noise. Using engineered nano holes filled with optofluidic materials in the signal and pump paths, we reduce pump and signal group velocity to improve the structure and achieve larger Raman gain and less dispersion. The time evolution and propagation of picosecond signal pulses and dispersion inside the device are analyzed and Raman gain, Raman bandwidth and bit rate are studied in one-ring and two-ring structures. To model Raman Amplification in these structures, Maxwell equations are solved using finite difference time domain method considering optical nonlinear parameters like two photon absorption, free carrier absorption and Kerr effect.
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Enhanced Raman Amplification by photonic crystal based waveguide structure
2012 14th International Conference on Transparent Optical Networks (ICTON), 2012Co-Authors: Amire Seifaraji, Vahid AhmadiAbstract:In this paper, we investigate the enhancement of Raman Amplification bandwidth in silicon based photonic crystal waveguides with self-phase modulation (SPM) effect. The Maxwell equations are solved using finite difference time domain method considering two photon absorption, free carrier absorption, Kerr and SPM effects. We also studied the effects of shape, width and average power on the Raman Amplification bandwidth.
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Enhanced Raman Amplification by hybrid photonic crystal based ring structure
6th International Symposium on Telecommunications (IST), 2012Co-Authors: Amire Seyedfaraji, Vahid AhmadiAbstract:In this paper, we investigate the enhancement of Raman Amplification gain and bandwidth in silicon based Raman amplifier with a hybrid photonic crystal ring resonator. The Maxwell equations are solved using finite difference time domain method considering two photon absorption, free carrier absorption and Kerr effects. We also study the effects of effective refractive index of pump, and effective refractive index of signal on the Raman Amplification gain with addition of several nano holes filled by optofluidic materials inside the ring in the signal path. Finally, by injecting 3 pumps with appropriate wavelength and power, we increased the Raman Amplification bandwidth to larger than 1.875nm.
D J Digiovanni - One of the best experts on this subject based on the ideXlab platform.
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capacity upgrades of transmission systems by Raman Amplification
IEEE Photonics Technology Letters, 1997Co-Authors: P B Hansen, L Eskildsen, Stephen Gregory Grubb, Andrew John Stentz, Thomas Andrew Strasser, Justin Boyd Judkins, J J Demarco, R Pedrazzani, D J DigiovanniAbstract:Raman Amplification is added to a transmission system to provide an increase in power budget allowing for a four-fold upgrade in capacity either by TDM or WDM. Here, a TDM upgrade from 2.5 to 10 Gb/s and a WDM upgrade from a single 10-Gb/s channel to four channels of 10 Gb/s each were experimentally verified with an improvement in the power budget of 7.4 dB. Raman gain is an attractive upgrade method for installed systems requiring no changes to the fiber span.
