The Experts below are selected from a list of 16743 Experts worldwide ranked by ideXlab platform
Michel Blondel - One of the best experts on this subject based on the ideXlab platform.
-
Round-Trip Time and Dispersion Optimization in a Dual-Wavelength Actively Mode-Locked Er-Doped Fiber Laser Including Nonchirped Fiber Bragg Gratings
2016Co-Authors: Michel BlondelAbstract:Abstract — Round-Trip Time and intracavity dispersion were optimized in a dual-wavelength actively mode-locked Er-doped fiber laser including two nonchirped fiber Bragg gratings. This optimization allowed to generate nearly transform-limited pulses as short as 16 and 13 ps at 1547 and 1562 nm, respectively, at a 3-GHz repetition rate only limited by the modulator bandwidth. In the experiment, the Round-Trip Time difference between pulses at two wavelengths was adjusted using a fiber strecher. Intracav-ity dispersion was managed at each wavelength separately. Index Terms—Active mode-locking, dual-wavelength pulse gen-eration, fiber Bragg gratings, fiber lasers. OPTICAL sources emitting high-repetition-rate picosec-ond pulses at two wavelengths simultaneously aRound 1.5 m are attractive devices for wavelength-multiplexed com-munication systems, optical sensing, fiber-optic metrology and Time-resolved spectroscopy. Dual-wavelength pulse generation was first demonstrated in actively mode-locked Er-doped fiber lasers by employing birefringence [1], and with chirped [2] or nonchirped fiber Bragg gratings (FBG’s) [3]–[5]. Indeed, FBG’s offer great flexibility for controlling the wavelength and optical bandwidth of the generated pulses. While pulses as short as a few picoseconds can be generated from actively mode-locked Er-doped fiber lasers [6], pulses of much longer duration and with high chirp have been reported until now in dual-wavelength actively mode-locked Er-doped fiber lasers using FBG’s (e.g., [5]). In this letter, we tackle the following issues related to the generation of dual-wavelength mode-locked pulses. First, due to the large homogeneous broadening of Erbium gain medium at room temperature ( 10 nm), it is difficult t
-
Round-Trip Time and dispersion optimization in a dual-wavelength actively mode-locked Er-doped fiber laser including nonchirped fiber Bragg gratings
IEEE Photonics Technology Letters, 1999Co-Authors: Olivier Deparis, Roman Kiyan, Ertan Salik, Dmitry Starodubov, Jack Feinberg, Olivier Pottiez, Patrice Mégret, Michel BlondelAbstract:Round-Trip Time and intracavity dispersion were optimized in a dual-wavelength actively mode-locked Er-doped fiber laser including two nonchirped fiber Bragg gratings. This optimization allowed to generate nearly transform-limited pulses as short as 16 and 13 ps at 1547 and 1562 nm, respectively, at a 3-GHz repetition rate only limited by the modulator bandwidth. In the experiment, the Round-Trip Time difference between pulses at two wavelengths was adjusted using a fiber stretcher. Intracavity dispersion was managed at each wavelength separately.
Olivier Deparis - One of the best experts on this subject based on the ideXlab platform.
-
Round-Trip Time and dispersion optimization in a dual-wavelength actively mode-locked Er-doped fiber laser including nonchirped fiber Bragg gratings
IEEE Photonics Technology Letters, 1999Co-Authors: Olivier Deparis, Roman Kiyan, Ertan Salik, Dmitry Starodubov, Jack Feinberg, Olivier Pottiez, Patrice Mégret, Michel BlondelAbstract:Round-Trip Time and intracavity dispersion were optimized in a dual-wavelength actively mode-locked Er-doped fiber laser including two nonchirped fiber Bragg gratings. This optimization allowed to generate nearly transform-limited pulses as short as 16 and 13 ps at 1547 and 1562 nm, respectively, at a 3-GHz repetition rate only limited by the modulator bandwidth. In the experiment, the Round-Trip Time difference between pulses at two wavelengths was adjusted using a fiber stretcher. Intracavity dispersion was managed at each wavelength separately.
Sereina Riniker - One of the best experts on this subject based on the ideXlab platform.
-
efficient Round Trip Time optimization for replica exchange enveloping distribution sampling re eds
Journal of Chemical Theory and Computation, 2017Co-Authors: Dominik Sidler, Michael Cristofolclough, Sereina RinikerAbstract:Replica-exchange enveloping distribution sampling (RE-EDS) allows the efficient estimation of free-energy differences between multiple end-states from a single molecular dynamics (MD) simulation. In EDS, a reference state is sampled, which can be tuned by two types of parameters, i.e., smoothness parameters(s) and energy offsets, such that all end-states are sufficiently sampled. However, the choice of these parameters is not trivial. Replica exchange (RE) or parallel tempering is a widely applied technique to enhance sampling. By combining EDS with the RE technique, the parameter choice problem could be simplified and the challenge shifted toward an optimal distribution of the replicas in the smoothness-parameter space. The choice of a certain replica distribution can alter the sampling efficiency significantly. In this work, global Round-Trip Time optimization (GRTO) algorithms are tested for the use in RE-EDS simulations. In addition, a local Round-Trip Time optimization (LRTO) algorithm is proposed fo...
-
Efficient Round-Trip Time Optimization for Replica-Exchange Enveloping Distribution Sampling (RE-EDS)
2017Co-Authors: Dominik Sidler, Michael Cristòfol-clough, Sereina RinikerAbstract:Replica-exchange enveloping distribution sampling (RE-EDS) allows the efficient estimation of free-energy differences between multiple end-states from a single molecular dynamics (MD) simulation. In EDS, a reference state is sampled, which can be tuned by two types of parameters, i.e., smoothness parameters(s) and energy offsets, such that all end-states are sufficiently sampled. However, the choice of these parameters is not trivial. Replica exchange (RE) or parallel tempering is a widely applied technique to enhance sampling. By combining EDS with the RE technique, the parameter choice problem could be simplified and the challenge shifted toward an optimal distribution of the replicas in the smoothness-parameter space. The choice of a certain replica distribution can alter the sampling efficiency significantly. In this work, global Round-Trip Time optimization (GRTO) algorithms are tested for the use in RE-EDS simulations. In addition, a local Round-Trip Time optimization (LRTO) algorithm is proposed for systems with slowly adapting environments, where a reliable estimate for the Round-Trip Time is challenging to obtain. The optimization algorithms were applied to RE-EDS simulations of a system of nine small-molecule inhibitors of phenylethanolamine N-methyltransferase (PNMT). The energy offsets were determined using our recently proposed parallel energy-offset (PEOE) estimation scheme. While the multistate GRTO algorithm yielded the best replica distribution for the ligands in water, the multistate LRTO algorithm was found to be the method of choice for the ligands in complex with PNMT. With this, the 36 alchemical free-energy differences between the nine ligands were calculated successfully from a single RE-EDS simulation 10 ns in length. Thus, RE-EDS presents an efficient method for the estimation of relative binding free energies
Patrice Mégret - One of the best experts on this subject based on the ideXlab platform.
-
Round-Trip Time and dispersion optimization in a dual-wavelength actively mode-locked Er-doped fiber laser including nonchirped fiber Bragg gratings
IEEE Photonics Technology Letters, 1999Co-Authors: Olivier Deparis, Roman Kiyan, Ertan Salik, Dmitry Starodubov, Jack Feinberg, Olivier Pottiez, Patrice Mégret, Michel BlondelAbstract:Round-Trip Time and intracavity dispersion were optimized in a dual-wavelength actively mode-locked Er-doped fiber laser including two nonchirped fiber Bragg gratings. This optimization allowed to generate nearly transform-limited pulses as short as 16 and 13 ps at 1547 and 1562 nm, respectively, at a 3-GHz repetition rate only limited by the modulator bandwidth. In the experiment, the Round-Trip Time difference between pulses at two wavelengths was adjusted using a fiber stretcher. Intracavity dispersion was managed at each wavelength separately.
Ertan Salik - One of the best experts on this subject based on the ideXlab platform.
-
Round-Trip Time and dispersion optimization in a dual-wavelength actively mode-locked Er-doped fiber laser including nonchirped fiber Bragg gratings
IEEE Photonics Technology Letters, 1999Co-Authors: Olivier Deparis, Roman Kiyan, Ertan Salik, Dmitry Starodubov, Jack Feinberg, Olivier Pottiez, Patrice Mégret, Michel BlondelAbstract:Round-Trip Time and intracavity dispersion were optimized in a dual-wavelength actively mode-locked Er-doped fiber laser including two nonchirped fiber Bragg gratings. This optimization allowed to generate nearly transform-limited pulses as short as 16 and 13 ps at 1547 and 1562 nm, respectively, at a 3-GHz repetition rate only limited by the modulator bandwidth. In the experiment, the Round-Trip Time difference between pulses at two wavelengths was adjusted using a fiber stretcher. Intracavity dispersion was managed at each wavelength separately.
