The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
C J S De Matos - One of the best experts on this subject based on the ideXlab platform.
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multi kilowatt all Fiber integrated chirped pulse amplification system yielding 40 pulse compression using air core Fiber and conventional erbium doped Fiber amplifier
Optics Express, 2004Co-Authors: C J S De Matos, J.r. TaylorAbstract:We present a totally Fiber integrated chirped-pulse amplification system using air-core photonic bandgap Fiber and a conventional erbium-doped Fiber amplifier. ~40-ps input pulses, generated in a Mach-Zehnder modulator, were stretched and spectrally broadened in a Dispersion-Shifted Fiber before being amplified and subsequently compressed in 10 m of anomalously-dispersive photonic bandgap Fiber to yield ~960 fs pulses. The system gives multi-kilowatt peak powers while the amplifier nonlinearity threshold is as low as ~150 W. Higher peak powers could be obtained by the use of an amplifier with higher nonlinearity threshold.
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raman assisted Fiber optical parametric amplifier and wavelength converter in highly nonlinear Fiber
Journal of The Optical Society of America B-optical Physics, 2002Co-Authors: D A Chestnu, C J S De Matos, Roy J TayloAbstract:We present a continuous-wave pumped Fiber optical parametric amplifier and wavelength converter in 1 km of highly nonlinear Dispersion-Shifted Fiber. The reduced pump requirements of the Fiber allowed a low-signal-loss configuration in which respective net gains and wavelength-conversion efficiencies of up to 8.6 dB and 5.9 dB were obtained with only 89 mW of pump power. These values were increased to 19.5 dB and 17.3 dB, respectively, when a counterpropagating 680-mW pump was used to assist the parametric process through Raman amplification. Raman assistance in highly nonlinear Fiber further promotes parametric amplification and wavelength conversion as a viable technology for the future.
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low threshold self induced modulational instability ring laser in highly nonlinear Fiber yielding a continuous wave 262 ghz soliton train
Optics Letters, 2002Co-Authors: C J S De Matos, D A Chestnut, J.r. TaylorAbstract:Modulational instability (MI) is employed in a self-induced ring cavity configuration based on highly nonlinear Dispersion-Shifted Fiber (HNL DSF) and an erbium-doped Fiber amplifier to generate a continuous-wave 262-GHz train of 365-fs optical solitons. The laser operates around 1540 nm, with an average output power of 15 mW. MI is achieved at a low threshold as a result of low average cavity dispersion and high Fiber nonlinearity. It is shown that, because of the normal dispersion of the HNL DSF, the solitons exist in the average soliton regime.
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continuous wave pumped raman assisted Fiber optical parametric amplifier and wavelength converter in conventional dispersion shifted Fiber
Optics Letters, 2001Co-Authors: C J S De Matos, D A Chestnut, P C Reeveshall, J.r. TaylorAbstract:We present a continuous-wave-pumped Fiber optical parametric amplifier, operating near 1539 nm in conventional Dispersion-Shifted Fiber, with maximum on–off gain and wavelength-conversion efficiency of 13.7 and 13.1 dB, respectively. In addition, we show a novel configuration based on Raman amplification assistance in the parametric gain Fiber that further increases the gain and wavelength-conversion efficiencies to 16.7 and 16.2 dB, respectively.
J.r. Taylor - One of the best experts on this subject based on the ideXlab platform.
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multi kilowatt all Fiber integrated chirped pulse amplification system yielding 40 pulse compression using air core Fiber and conventional erbium doped Fiber amplifier
Optics Express, 2004Co-Authors: C J S De Matos, J.r. TaylorAbstract:We present a totally Fiber integrated chirped-pulse amplification system using air-core photonic bandgap Fiber and a conventional erbium-doped Fiber amplifier. ~40-ps input pulses, generated in a Mach-Zehnder modulator, were stretched and spectrally broadened in a Dispersion-Shifted Fiber before being amplified and subsequently compressed in 10 m of anomalously-dispersive photonic bandgap Fiber to yield ~960 fs pulses. The system gives multi-kilowatt peak powers while the amplifier nonlinearity threshold is as low as ~150 W. Higher peak powers could be obtained by the use of an amplifier with higher nonlinearity threshold.
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low threshold self induced modulational instability ring laser in highly nonlinear Fiber yielding a continuous wave 262 ghz soliton train
Optics Letters, 2002Co-Authors: C J S De Matos, D A Chestnut, J.r. TaylorAbstract:Modulational instability (MI) is employed in a self-induced ring cavity configuration based on highly nonlinear Dispersion-Shifted Fiber (HNL DSF) and an erbium-doped Fiber amplifier to generate a continuous-wave 262-GHz train of 365-fs optical solitons. The laser operates around 1540 nm, with an average output power of 15 mW. MI is achieved at a low threshold as a result of low average cavity dispersion and high Fiber nonlinearity. It is shown that, because of the normal dispersion of the HNL DSF, the solitons exist in the average soliton regime.
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continuous wave pumped raman assisted Fiber optical parametric amplifier and wavelength converter in conventional dispersion shifted Fiber
Optics Letters, 2001Co-Authors: C J S De Matos, D A Chestnut, P C Reeveshall, J.r. TaylorAbstract:We present a continuous-wave-pumped Fiber optical parametric amplifier, operating near 1539 nm in conventional Dispersion-Shifted Fiber, with maximum on–off gain and wavelength-conversion efficiency of 13.7 and 13.1 dB, respectively. In addition, we show a novel configuration based on Raman amplification assistance in the parametric gain Fiber that further increases the gain and wavelength-conversion efficiencies to 16.7 and 16.2 dB, respectively.
Kyo Inoue - One of the best experts on this subject based on the ideXlab platform.
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1 5 μm band quantum correlated photon pair generation in dispersion shifted Fiber suppression of noise photons by cooling Fiber
Optics Express, 2005Co-Authors: Hiroki Takesue, Kyo InoueAbstract:Spontaneous four-wave mixing in a Dispersion-Shifted Fiber (DSF) is a promising approach for generating quantum-correlated photon pairs in the 1.5 μm band. However, it has been reported that noise photons generated by the spontaneous Raman scattering process degrade the quantum correlation of the generated photons. This paper describes the characteristics of quantum-correlated photon pair generation in a DSF cooled by liquid nitrogen. With this technique, the number of noise photons was sufficiently suppressed and the ratio of true coincidence to accidental coincidence was increased to ~30.
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generation of polarization entangled photon pairs and violation of bell s inequality using spontaneous four wave mixing in a Fiber loop
Physical Review A, 2004Co-Authors: Hiroki Takesue, Kyo InoueAbstract:We report the generation of polarization entangled photon pairs in the 1550-nm wavelength band using spontaneous four-wave mixing in a Dispersion-Shifted Fiber loop. The use of the Fiber-loop configuration made it possible to generate polarization entangled states very stably. With accidental coincidences subtracted, we obtained coincidence fringes with $g90%$ visibilities, and observed a violation of Bell's inequality by seven standard deviations. We also confirmed the preservation of the quantum correlation between the photons even after they had been separated by 20 km of optical Fiber.
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spectral inversion with no wavelength shift based on four wave mixing with orthogonal pump beams
Optics Letters, 1997Co-Authors: Kyo InoueAbstract:Generation of phase-conjugate light with no wavelength shift that utilizes four-wave mixing (FWM) with two orthogonal pump beams is discussed. Owing to the polarization properties of nondegenerate FWM, phase-conjugate light generated at the original signal wavelength can be obtained. An experiment using Dispersion-Shifted Fiber as an optical nonlinear medium confirms the proposed scheme.
H. Suzuki - One of the best experts on this subject based on the ideXlab platform.
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Application of Raman-distributed amplification to WDM transmission systems using 1.55-/spl mu/m Dispersion-Shifted Fiber
Journal of Lightwave Technology, 2001Co-Authors: N. Takachio, H. SuzukiAbstract:A numerical design method for wavelength division multiplexing (WDM) transmission systems employing distributed Raman amplification (DRA) is proposed. This method evaluates Fiber nonlinear effects by considering the equivalent Fiber loss with DRA. The method is used to evaluate the performance of WDM transmission systems in which DRA is employed in a 1.55-/spl mu/m Dispersion-Shifted Fiber (DSF) transmission line. Transmission limit and the optimum Fiber input powers for 1550-nm band (C-band) and 1580-nm band (L-band) transmission are investigated. Results show that bidirectional pumping is the best approach to extending transmission distance. Furthermore, the transport limits of optical transport networks that use DRA and optical add/drop multiplexers are analyzed.
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1 tb s 100 x 10 gb s super dense wdm transmission with 25 ghz channel spacing in the zero dispersion region employing distributed raman amplification technology
IEEE Photonics Technology Letters, 2000Co-Authors: H. Suzuki, N. Takachio, K. Iwatsuki, Junichi Kani, Y Tada, M SumidaAbstract:We achieve 1 Tb/s (100/spl times/10 Gb/s) super-dense WDM (super DWDM) transmission with 25-GHz channel spacing (0.4 bit/s/Hz spectral efficiency) in the zero-dispersion region over a 4/spl times/80 km Dispersion-Shifted Fiber by employing backward pumped distributed Raman amplification and forward error correction. By adopting bi-directional pumping, we present experimental results showing that the transmission distance is extended approximately threefold to 1040 km.
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32 spl times 10 gb s distributed raman amplification transmission with 50 ghz channel spacing in the zero dispersion region over 640 km of 1 55 spl mu m dispersion shifted Fiber
Optical Fiber Communication Conference, 1999Co-Authors: N. Takachio, H. SuzukiAbstract:50-GHz-spaced, 32-channel, 10-Gb/s transmission in the zero-dispersion region over 80/spl times/80 km of 1.55-/spl mu/m Dispersion-Shifted Fiber was successfully conducted by employing distributed Raman amplification. This paper demonstrates a feasibility of dense WDM systems in zero-dispersion region.
Prem Kumar - One of the best experts on this subject based on the ideXlab platform.
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generation of high purity telecom band entangled photon pairs in dispersion shifted Fiber
Optics Letters, 2006Co-Authors: J. Chen, Paul L. Voss, Chuang Liang, Xiaoying Li, Prem KumarAbstract:We study the purity of correlated photon pairs generated in a Dispersion-Shifted Fiber at various temperatures. The ratio of coincidence to accidental-coincidence counts greater than 100 can be obtained as the Fiber is cooled to liquid-nitrogen temperature (77 K). We then generate polarization-entangled photon pairs by using a compact counterpropagating scheme. Two-photon interference with visibility >98% and Bell's inequality violation by >8 standard deviations of measurement uncertainty are observed at 77 K, without subtracting the accidental-coincidence counts due to background Raman photons.
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Generation of high purity telecom-band entangled photon-pairs in Dispersion-Shifted Fiber
2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, 2006Co-Authors: J. Chen, Paul L. Voss, Chuang Liang, Xiaoying Li, Prem KumarAbstract:We generate entangled photon-pairs from Dispersion-Shifted Fiber at various temperatures. Two-photon interference with > 98% visibility and Bellpsilas inequality violation by > 8 standard deviations are observed at 77 K, without subtracting background Raman photons.