Distributed Feedback Semiconductor Lasers

Carroll, J.E.; Whiteaway, J.E.A.; Plumb, Dick

doi:10.1049/pbcs010e

Cited by 218 publications

(126 citation statements)

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“…... general, but here we focus on the single-mode case where only one of them is relevant, which can be achieved using distributed Bragg gratings (DBG) [22] or periodic PT symmetric structures [17]. In Eq.…”

Section: Analytical Results: Supermode Coupled Equations For Susy Arraysmentioning

confidence: 99%

“…However, it was shown that their operation is dominated by multimode chaotic emission [19]. In general, the longitudinal modes associated with each cavity can be eliminated by using distributed Bragg gratings (DBG) [22] or periodic PT symmetric structures [17]. On the other hand, eliminating the transverse collective modes of the array is a daunting job.…”

Section: Introductionmentioning

confidence: 99%

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Supersymmetric laser arrays

El‐Ganainy

Khajavikhan

et al. 2015

Phys. Rev. A

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Section: Analytical Results: Supermode Coupled Equations For Susy Arraysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Supersymmetric laser arrays

El‐Ganainy

Khajavikhan

et al. 2015

Phys. Rev. A

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“…Its contribution to the optical field is harmonically oscillating and dominates beyond threshold, giving rise to high coherence. Distributed feedback (DFB) semiconductor lasers come close to this ideal [CWP98]. They exhibit continuous wave (CW) single mode emission up to high pump currents.…”

Section: Introductionmentioning

confidence: 99%

Self-Organization in Semiconductor Lasers with Ultrashort Optical Feedback

et al. 2004

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In this work, self-organization in semiconductor lasers with ultra-short optical feedback is investigated. Exploiting dc currents to tune the relevant feedback parameters, we have experimentally prepared and studied a number of novel nonlinear dynamical scenarios.Two different types of self-sustaining intensity-pulsations are detected depending on strength and phase of the feedback. One type of pulsations is emerging in a Hopf-bifurcation from relaxation oscillations. These oscillations become undamped due to dispersive self-Q switching. The second type of pulsations is a beating of distinct compound-cavity modes. It is also born in a Hopf bifurcation. These findings represent experimental evidence for theoretical predictions. A supplementary mode and stability analysis agrees well with measurements.Coexistence of mode beating and relaxation oscillations gives rise to the break-up of regular pulsations into chaotic emission via a quasi-periodic route to chaos. The sudden destruction of chaos is indicative of a boundary crisis scenario, in which we see a discontinuous disappearance of an attractor. The existence of chaotic saddles underlying transient chaotic dynamics which appears behind boundary crisis is experimentally verified. It is experimentally demonstrated that an excitation of chaotic transients is closely related to a conventional excitability. The experiment is supplemented by numerical simulations.The influence of external Gaussian noise close to the onset of sub-and super-critical Hopf bifurcations is studied. Noise-induced oscillations appear as a noisy precursor with Lorentzian shape peak in the power spectrum. The coherence factor defined by the product of height and quality factor exhibits non-monotonic behavior with a distinct maximum at a certain noise intensity for both types of Hopf bifurcations, demonstrating coherence resonance. Besides these similarities, the measurements reveal also qualitative differences between the two cases. Whereas the width of the noise induced peak increases monotonically with noise intensity for the supercritical bifurcation, it traverses a pronounced minimum in the subcritical case. The experimental findings are examined in terms of general model for the noise driven motion close to bifurcations. Keywords

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“…Coupled mode equations are used to model laser mode in the device [11] [14]. The electric field in the device is presented as: …”

Section: Mathematical Model and Simulation Parametersmentioning

confidence: 99%

An Improved Design for an All-Optical Flip-Flop Based on a Nonlinear 3-Sections DFB Laser Cavity

Zoweil¹

2016

OPJ

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A new all optical flip-flop based on a 3-sections nonlinear semiconductor DFB laser structure is proposed and simulated. The operation of the device does not require a holding beam. Electrical current injection into an active layer provides optical gain to the laser mode. The wave-guiding layer consists of a linear grating section centered between 2 detuned nonlinear grating sections. The average refractive index in the nonlinear sections is slightly higher than the refractive index of the middle section. A negative nonlinear refractive index coefficient exists along the nonlinear sections. In the "OFF" state, the DFB structure does not provide enough optical feedback to lase due to the detuned sections. At high light intensity in structure, "ON" state, detuning decreases and the DFB structure allows for a laser mode that sustains the decrease in detuning to exist. The nonlinearity is provided by direct photon absorption at the Urbach tail. Numerical simulations using GPGPU computing show nanoseconds transition times between "OFF" and "ON" states.

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Distributed Feedback Semiconductor Lasers

Cited by 218 publications

References 0 publications

Supersymmetric laser arrays

Supersymmetric laser arrays

Self-Organization in Semiconductor Lasers with Ultrashort Optical Feedback

An Improved Design for an All-Optical Flip-Flop Based on a Nonlinear 3-Sections DFB Laser Cavity

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