Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers

Tronciu, Vasile; Lichtner, Mark; Radziunas, Mindaugas; Bandelow, U.; Wenzel, H.

doi:10.1007/s11082-009-9354-6

Cited by 9 publications

(13 citation statements)

References 16 publications

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“…In line with previous reports on 980 nm MOPAs [6][7][8], our qualitative interpretation of this behavior is as follows: At injection conditions A-like the lasing takes place at the wavelength selected by the design of the DFB grating and the device behaves as expected from a MOPA: the laser emission generated in the MO section undergoes amplification in the PA section without spectral changes. As I PA increases, the heat generated in the amplifier section slightly increases the temperature of the MO section and therefore, the spectral position of the Bragg condition shifts to a higher wavelength due to the thermal increase of its refractive index.…”

Section: Resultssupporting

confidence: 89%

“…At an eye-safe wavelength close to 1.5 urn, commercial devices achieve 1.6 W output power in CW conditions and recently we have demonstrated the generation of 100 ps wide pulses with peak power up to 2.7 W at 1 GHz by Gain-Switching (GS) the MO section of these devices [2]. However, the obvious advantages of integrated MOP As in comparison with their hybrid versions in terms of compactness and integrability can be jeopardized by the appearance of multiple emission instabilities even when both sections are driven in CW conditions [2][3][4][5][6][7][8]. Many of these instabilities are related with the appearance of modes of the whole MOPA cavity acting as a compound cavity due to the residual reflectance of the amplifier front facet that allows optical feedback.…”

Section: Introductionmentioning

confidence: 99%

“…Many of these instabilities are related with the appearance of modes of the whole MOPA cavity acting as a compound cavity due to the residual reflectance of the amplifier front facet that allows optical feedback. Interaction and competition between these modes and with the MO mode results in ripples in the Power-Current characteristics [2,3,[6][7][8] and self-pulsations caused by the mode beating at the frequency of the spacing between neighboring modes in the optical spectra [2][3].…”

Section: Introductionmentioning

confidence: 99%

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Emission regimes in a distributed feedback tapered master-oscillator power-amplifier at 1.5 μm

et al. 2014

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Integrated master-oscillator power amplifiers driven under steady-state injection conditions are known to show a complex dynamics resulting in a variety of emission regimes. We present experimental results on the emission characteristics of a 1.5 urn distributed feedback tapered master-oscillator power-amplifier in a wide range of steady-state injection conditions, showing different dynamic behaviors. The study combines the optical and radio-frequency spectra recorded under different levels of injected current into the master oscillator and the power amplifier sections. Under low injection current of the master oscillator the correlation between the optical and radio-frequency spectral maps allows to identify operation regimes in which the device emission arises from either the master oscillator mode or from the compound cavity modes allowed by the residual reflectance of the amplifier front facet. The quasi-periodic occurrence of these emission regimes as a function of the amplifier current is interpreted in terms of a thermally tuned competition between the modes of the master oscillator and the compound cavity modes. Under high injection current of the masteroscillator, two different regimes alternate quasi-periodically as a function of the injected current in the power amplifier: a stable regime with a single mode emission at the master oscillator frequency, and an unstable and complex self-pulsating regime showing strong peaks in the radio-frequency spectra as well as multiple frequencies in the optical spectra.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Emission regimes in a distributed feedback tapered master-oscillator power-amplifier at 1.5 μm

et al. 2014

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“…Theoretically, such a wavelength shift can be realized by uniform changes of the detuning factor d entering the TW model equations (1). More complicated wavelength shifting and jumping scenarios are reported in semiconductor lasers with several separate electrical contacts (Bandelow et al, 2001;Radziunas et al, 2008;Spreemann et al, 2009;Tronciu et al, 2009). In Spreemann et al (2009) and Radziunas et al (2008), we have proposed to model bias current induced (Joule) heating effects by the following modification of the detuning factor d…”

Section: Thermal Effectsmentioning

confidence: 99%

Modeling and simulations of broad-area edge-emitting semiconductor devices

Radziunas

2016

The International Journal of High Performance Computing Applica

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We present a (2 + 1)-dimensional partial differential equation model for spatial-lateral dynamics of edge-emitting broadarea semiconductor devices and several extensions of this model describing different physical effects. MPI-based parallelization of the resulting middle-size numerical problem is implemented and tested on the blade cluster and separate multi-core computers at the Weierstrass Institute in Berlin. It was found that an application of 25-30 parallel processes on all considered platforms guaranteed a nearly optimal performance of the algorithm with a speedup of around 20-25 and an efficiency of 0.7-0.8. It was also shown that simultaneous usage of several in-house available multi-core computers allows for a further increase of the speedup without a significant loss of efficiency. Finally, the importance of the considered problem and efficient numerical simulations of this problem were illustrated via a few examples occurring in real world applications.

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“…The master-oscillator (MO) tapered power-amplifier (PA) laser shown in Fig. 1(b) was analyzed theoretically and experimentally in [24,25,28]. A narrow waveguide of the MO enables an improvement of the lateral profile of the beam, which later is amplified in the tapered PA part of the device.…”

Section: Introductionmentioning

confidence: 99%

Effective Numerical Algorithm for Simulations of Beam Stabilization in Broad Area Semiconductor Lasers and Amplifiers

Radziunas

Čiegis

2014

Mathematical Modelling and Analysis

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Abstract. A 2 + 1 dimensional PDE traveling wave model describing spatial-lateral dynamics of edge-emitting broad area semiconductor devices is considered. A numerical scheme based on a split-step Fourier method is presented. The domain decomposition method is used to parallelize the sequential algorithm. The parallel algorithm is implemented by using Message Passing Interface system, results of computational experiments are presented and the scalability of the algorithm is analyzed. Simulations of the model equations are used for optimizing of existing devices with respect to the emitted beam quality, as well as for creating and testing of novel device design concepts.

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Improving the stability of distributed-feedback tapered master-oscillator power-amplifiers

Cited by 9 publications

References 16 publications

Emission regimes in a distributed feedback tapered master-oscillator power-amplifier at 1.5 μm

Emission regimes in a distributed feedback tapered master-oscillator power-amplifier at 1.5 μm

Modeling and simulations of broad-area edge-emitting semiconductor devices

Effective Numerical Algorithm for Simulations of Beam Stabilization in Broad Area Semiconductor Lasers and Amplifiers

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