The Experts below are selected from a list of 6348 Experts worldwide ranked by ideXlab platform
Erich P. Ippen - One of the best experts on this subject based on the ideXlab platform.
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ultrashort pulse fiber Ring Lasers
Applied Physics B, 1997Co-Authors: L.e. Nelson, D J Jones, Hermann A. Haus, K. Tamura, Erich P. IppenAbstract:This paper reviews recent progress on ultrashort pulse generation with erbium-doped fiber Ring Lasers. The passive mode-locking technique of polarization additive pulse mode-locking (P-APM) is used to generate stable, self- starting, sub-500 fs pulses at the fundamental repetition rate from a unidirectional fiber Ring laser operating in the soliton regime. Saturation of the APM, spectral sideband genera- tion, and intracavity filteRing are discussed. Harmonic mode- locking of fiber Ring Lasers with soliton pulse compression is addressed, and stability regions for the solitons are mapped and compared with theoretical predictions. The stretched- pulse laser, which incorporates segments of positive- and negative-dispersion fiber into the P-APM fiber Ring, gen- erates shorter (sub-100 fs) pulses with broader bandwidths (> 65 nm) and higher pulse energies (up to 2: 7n J). We dis- cuss optimization of the net dispersion of the stretched-pulse laser, use of the APM rejection port as the laser output port, and frequency doubling for amplifier seed applications. We also review the analytical theory of the stretched-pulse laser as well as discuss the excellent noise characteristics of both the soliton and stretched-pulse Lasers.
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relaxation oscillation behavior in polarization additive pulse mode locked fiber Ring Lasers
Applied Physics Letters, 1996Co-Authors: Shu Namiki, Erich P. Ippen, Hermann A. Haus, K. TamuraAbstract:The noise characteristics of a polarization additive pulse mode‐locked erbium‐doped fiber soliton Ring laser are examined. Relaxation oscillations are found only when the cw background copropagates with the soliton and not when the soliton operates alone. This observation proves that the mode‐locked pulse stream has a strong self‐stabilization that exempts the soliton from the relaxation oscillations, leading to extremely quiet operation.
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stretched pulse additive pulse mode locking in fiber Ring Lasers theory and experiment
IEEE Journal of Quantum Electronics, 1995Co-Authors: Hermann A. Haus, L.e. Nelson, K. Tamura, Erich P. IppenAbstract:Stretched-pulse additive pulse mode-locking uses segments of fiber of large positive and large negative group velocity dispersion (GVD) in the cavity. The changes in pulse width per pass due to the varying GVD can be an order of magnitude or more. A theory is developed based on the master equation that covers this case of large pulse changes in one transit. The general predictions of the theory are verified by experimental results. >
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soliton versus nonsoliton operation of fiber Ring Lasers
Applied Physics Letters, 1994Co-Authors: K. Tamura, L.e. Nelson, Hermann A. Haus, Erich P. IppenAbstract:To date most passively mode‐locked erbium‐doped fiber laser systems have employed solitons for short pulse generation, and ultrashort high energy pulses have been difficult to achieve. We show that by reducing the system nonlinearity via pulse stretching and employing net positive dispersion cavities, pulses of sub‐100‐fs duration and ≳100 pJ energy are readily generated. Data are presented for varying net dispersion in a fiber Ring.
J M Lopezhiguera - One of the best experts on this subject based on the ideXlab platform.
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stabilization of dual wavelength erbium doped fiber Ring Lasers by single mode operation
IEEE Photonics Technology Letters, 2010Co-Authors: M A Quintela, R A Perezherrera, I Canales, M Fernandezvallejo, M Lopezamo, J M LopezhigueraAbstract:In this work, a novel single-longitudinal-mode (SLM) dual-wavelength laser configuration is proposed and demonstrated. This laser is based on Ring resonators, and employs fiber Bragg gratings to select the operation wavelengths. It includes a short piece of highly doped Er-fiber that acts as the active medium. The stable SLM operation is guaranteed when the two lasing channels present similar output powers. This behavior is shown for different pump powers.
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stabilization of dual wavelength erbium doped fiber Ring Lasers by single mode operation
IEEE Photonics Technology Letters, 2010Co-Authors: Maria Angeles Quintela, R A Perezherrera, I Canales, M Fernandezvallejo, M Lopezamo, J M LopezhigueraAbstract:In this work, a novel single-longitudinal-mode (SLM) dual-wavelength laser configuration is proposed and demonstrated. This laser is based on Ring resonators, and employs fiber Bragg gratings to select the operation wavelengths. It includes a short piece of highly doped Er-fiber that acts as the active medium. The stable SLM operation is guaranteed when the two lasing channels present similar output powers. This behavior is shown for different pump powers.
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comparison between a symmetric bidirectional pumping and a unidrectional pumping configurations in an erbium fiber Ring laser
Proceedings of SPIE the International Society for Optical Engineering, 2007Co-Authors: M A Quintela, C Quintela, M Lomer, F J Madruga, Olga M Conde, J M LopezhigueraAbstract:An experimental comparative study between two wide-band wavelength-tunable erbium doped fiber Ring Lasers (EDFRLs) with the same active fiber length but with two different pumping configuration (forward unidirectional pumping and symmetric bidirectional pumping) is reported in this paper. Both fiber Lasers cover almost the whole C-band and L-band with a single setup laser. The signal wavelength can be tuned in a wide range of 60 nm with the two presented Lasers. Nevertheless, experimental results verify that a higher output power is obtained with the bidirectional pump configuration.
K. Tamura - One of the best experts on this subject based on the ideXlab platform.
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ultrashort pulse fiber Ring Lasers
Applied Physics B, 1997Co-Authors: L.e. Nelson, D J Jones, Hermann A. Haus, K. Tamura, Erich P. IppenAbstract:This paper reviews recent progress on ultrashort pulse generation with erbium-doped fiber Ring Lasers. The passive mode-locking technique of polarization additive pulse mode-locking (P-APM) is used to generate stable, self- starting, sub-500 fs pulses at the fundamental repetition rate from a unidirectional fiber Ring laser operating in the soliton regime. Saturation of the APM, spectral sideband genera- tion, and intracavity filteRing are discussed. Harmonic mode- locking of fiber Ring Lasers with soliton pulse compression is addressed, and stability regions for the solitons are mapped and compared with theoretical predictions. The stretched- pulse laser, which incorporates segments of positive- and negative-dispersion fiber into the P-APM fiber Ring, gen- erates shorter (sub-100 fs) pulses with broader bandwidths (> 65 nm) and higher pulse energies (up to 2: 7n J). We dis- cuss optimization of the net dispersion of the stretched-pulse laser, use of the APM rejection port as the laser output port, and frequency doubling for amplifier seed applications. We also review the analytical theory of the stretched-pulse laser as well as discuss the excellent noise characteristics of both the soliton and stretched-pulse Lasers.
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relaxation oscillation behavior in polarization additive pulse mode locked fiber Ring Lasers
Applied Physics Letters, 1996Co-Authors: Shu Namiki, Erich P. Ippen, Hermann A. Haus, K. TamuraAbstract:The noise characteristics of a polarization additive pulse mode‐locked erbium‐doped fiber soliton Ring laser are examined. Relaxation oscillations are found only when the cw background copropagates with the soliton and not when the soliton operates alone. This observation proves that the mode‐locked pulse stream has a strong self‐stabilization that exempts the soliton from the relaxation oscillations, leading to extremely quiet operation.
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stretched pulse additive pulse mode locking in fiber Ring Lasers theory and experiment
IEEE Journal of Quantum Electronics, 1995Co-Authors: Hermann A. Haus, L.e. Nelson, K. Tamura, Erich P. IppenAbstract:Stretched-pulse additive pulse mode-locking uses segments of fiber of large positive and large negative group velocity dispersion (GVD) in the cavity. The changes in pulse width per pass due to the varying GVD can be an order of magnitude or more. A theory is developed based on the master equation that covers this case of large pulse changes in one transit. The general predictions of the theory are verified by experimental results. >
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soliton versus nonsoliton operation of fiber Ring Lasers
Applied Physics Letters, 1994Co-Authors: K. Tamura, L.e. Nelson, Hermann A. Haus, Erich P. IppenAbstract:To date most passively mode‐locked erbium‐doped fiber laser systems have employed solitons for short pulse generation, and ultrashort high energy pulses have been difficult to achieve. We show that by reducing the system nonlinearity via pulse stretching and employing net positive dispersion cavities, pulses of sub‐100‐fs duration and ≳100 pJ energy are readily generated. Data are presented for varying net dispersion in a fiber Ring.
Younggeun Han - One of the best experts on this subject based on the ideXlab platform.
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novel multiwavelength erbium doped fiber and raman fiber Ring Lasers with continuous wavelength spacing tunability at room temperature
Journal of Lightwave Technology, 2007Co-Authors: Younggeun Han, Ju Han Lee, Sang Bae Lee, L Poti, Antonella BogoniAbstract:In this paper, we investigate a flexibly tunable multiwavelength fiber Ring laser with a continuous wavelength spacing tunability, incorporating a superimposed chirped fiber Bragg grating (CFBG) at room temperature. We exploit versatile gain media such as erbium-doped fiber (EDF) and Raman amplifiers in generating the multiwavelength fiber Ring laser. The wavelength spacing of a superimposed CFBG can be continuously controlled by modifying the chirp ratio of the grating with the specially designed apparatus. After configuRing a fiber Ring cavity with the proposed multichannel filter, we realize stable multiwavelength fiber Ring Lasers at room temperature, which are based on an EDF amplifier incorporating a highly nonlinear dispersion-shifted fiber or a Raman amplifier using a dispersion-compensated fiber. Power fluctuation is less than ~0.6 dB. No lasing wavelength change is severally observed for the whole tuning range. For the multiwavelength EDF laser, stable 11-wavelength simultaneous operation spaced at 0.51 nm, with a signal-to-noise ratio (SNR) of more than ~45 dB at room temperature, is achieved. A high-quality multiwavelength Raman laser output with stable 30 lasing wavelengths spaced at 0.51 nm with a high SNR of more than ~45 dB is also realized. By applying the proposed tuning technique to both the multiwavelength EDF and Raman Lasers, a wide and continuous tunability of lasing wavelength spacing is successfully achieved, which is measured to be ~ plusmn0.033 nm/mm. By controlling the pump power in the multiwavelength Raman fiber Ring laser, we can control the number of lasing channels at a wavelength spacing of 0.51 nm.
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multiwavelength raman fiber Ring laser based on tunable cascaded long period fiber gratings
IEEE Photonics Technology Letters, 2003Co-Authors: Younggeun Han, Changseok Kim, Jin U Kang, Unchul Paek, Youngjae ChungAbstract:Multiwavelength Raman fiber Lasers using intracavity tunable cascaded long-period fiber gratings (LPFGs) are discussed. The application of the cascaded LPFGs as a multichannel fiber filter for the multiple-wavelength generation is proposed and experimentally demonstrated. The characteristics of multiwavelength fiber-Ring Lasers can be controlled by changing the physical parameters of cascaded LPFGs such as the separation distance between the gratings, grating length, and number of gratings. The multiwavelength Raman fiber-Ring laser with nine wavelength-division-multiplexing channels with 100-GHz spacing and 19 channels with 50-GHz spacing has been achieved by varying the physical parameters of cascaded LPFGs.
Hermann A. Haus - One of the best experts on this subject based on the ideXlab platform.
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ultrashort pulse fiber Ring Lasers
Applied Physics B, 1997Co-Authors: L.e. Nelson, D J Jones, Hermann A. Haus, K. Tamura, Erich P. IppenAbstract:This paper reviews recent progress on ultrashort pulse generation with erbium-doped fiber Ring Lasers. The passive mode-locking technique of polarization additive pulse mode-locking (P-APM) is used to generate stable, self- starting, sub-500 fs pulses at the fundamental repetition rate from a unidirectional fiber Ring laser operating in the soliton regime. Saturation of the APM, spectral sideband genera- tion, and intracavity filteRing are discussed. Harmonic mode- locking of fiber Ring Lasers with soliton pulse compression is addressed, and stability regions for the solitons are mapped and compared with theoretical predictions. The stretched- pulse laser, which incorporates segments of positive- and negative-dispersion fiber into the P-APM fiber Ring, gen- erates shorter (sub-100 fs) pulses with broader bandwidths (> 65 nm) and higher pulse energies (up to 2: 7n J). We dis- cuss optimization of the net dispersion of the stretched-pulse laser, use of the APM rejection port as the laser output port, and frequency doubling for amplifier seed applications. We also review the analytical theory of the stretched-pulse laser as well as discuss the excellent noise characteristics of both the soliton and stretched-pulse Lasers.
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relaxation oscillation behavior in polarization additive pulse mode locked fiber Ring Lasers
Applied Physics Letters, 1996Co-Authors: Shu Namiki, Erich P. Ippen, Hermann A. Haus, K. TamuraAbstract:The noise characteristics of a polarization additive pulse mode‐locked erbium‐doped fiber soliton Ring laser are examined. Relaxation oscillations are found only when the cw background copropagates with the soliton and not when the soliton operates alone. This observation proves that the mode‐locked pulse stream has a strong self‐stabilization that exempts the soliton from the relaxation oscillations, leading to extremely quiet operation.
-
stretched pulse additive pulse mode locking in fiber Ring Lasers theory and experiment
IEEE Journal of Quantum Electronics, 1995Co-Authors: Hermann A. Haus, L.e. Nelson, K. Tamura, Erich P. IppenAbstract:Stretched-pulse additive pulse mode-locking uses segments of fiber of large positive and large negative group velocity dispersion (GVD) in the cavity. The changes in pulse width per pass due to the varying GVD can be an order of magnitude or more. A theory is developed based on the master equation that covers this case of large pulse changes in one transit. The general predictions of the theory are verified by experimental results. >
-
soliton versus nonsoliton operation of fiber Ring Lasers
Applied Physics Letters, 1994Co-Authors: K. Tamura, L.e. Nelson, Hermann A. Haus, Erich P. IppenAbstract:To date most passively mode‐locked erbium‐doped fiber laser systems have employed solitons for short pulse generation, and ultrashort high energy pulses have been difficult to achieve. We show that by reducing the system nonlinearity via pulse stretching and employing net positive dispersion cavities, pulses of sub‐100‐fs duration and ≳100 pJ energy are readily generated. Data are presented for varying net dispersion in a fiber Ring.
