All-Optical Noninvasive Delayed Feedback Control of by Sylvia Schikora PDF

By Sylvia Schikora

ISBN-10: 365801539X

ISBN-13: 9783658015398

ISBN-10: 3658015403

ISBN-13: 9783658015404

​The stabilization of risky states hidden within the dynamics of a approach, particularly the regulate of chaos, bought a lot awareness within the final years. during this paintings, a widely known keep watch over strategy referred to as not on time suggestions regulate is utilized for the 1st time fullyyt within the all-optical area. A multisection semiconductor laser gets optical suggestions from an exterior Fabry-Perot interferometer. The keep watch over sign is a phase-tunable superposition of the laser sign, and provokes the laser to function in an another way volatile periodic kingdom with a interval equivalent to the time hold up. The keep watch over is noninvasive, as the mirrored sign has a tendency to 0 whilst the objective country is reached.

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3) value of F steers the depth of the minima in the FP reflectivity spectrum. For F = 1 they go to zero. 12: Adjustment of a selfpulsating optical signal to a Fabry-Perot cavity. Optical spectrum of the selfpulsation (dashed lines) and Fabry-Perot reflectivity spectrum (gray line). is satisfied3 . Noninvasive control requires Eq. 3) to be permanently fulfilled, making high demands on the stability of the FP phase φ . Under resonant adjustment the reflectivity of the Fabry-Perot cavity is zero for the optical frequency components of the target state, but for all other frequencies a finite feedback is generated.

Therefore, all adaptations can be realized by varying the point of operation in the laser. In the studied MSL, a temperature variation allows for a tuning of the emission frequency ω0 - and thereby of φ - without affecting other properties like pulsation frequency or pulsation damping too much. 3) is usually fulfilled by adaptation of the temperature. The pulsation period T is always adjusted via a laser current. In all control experiments, the tracing of a stabilized state is performed along a line in parameter space with constant ω0 and 1/T .

The dynamic system departs from an unstable focus along spirals, with the intrinsic focus period T0 . The control force F should suppress the outwards spiralling movement. The optimal choice for the delay time τopt is equal to half the intrinsic focus period T0 [HS05], τopt = T0 /2 = π/ω. 1) With this choice, a control force F = K(x(t − τ) − x(t)) (gray arrow in Fig. 1 (c)) always points towards the origin of the spiral, to the unstable focus. The outwards spiralling movement of the solution is suppressed.

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All-Optical Noninvasive Delayed Feedback Control of Semiconductor Lasers by Sylvia Schikora

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