By Sylvia Schikora
The stabilization of volatile states hidden within the dynamics of a approach, particularly the keep watch over of chaos, bought a lot awareness within the final years. during this paintings, a well known keep an eye on strategy known as not on time suggestions regulate is utilized for the 1st time totally within the all-optical area. A multisection semiconductor laser gets optical suggestions from an exterior Fabry-Perot interferometer. The regulate sign is a phase-tunable superposition of the laser sign, and provokes the laser to function in an another way volatile periodic nation with a interval equivalent to the time hold up. The keep an eye on is noninvasive, as the mirrored sign has a tendency to 0 whilst the objective country is reached.
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Extra resources for All-Optical Noninvasive Delayed Feedback Control of Semiconductor Lasers
13 shows a photograph of the realized experiment. Analysis The extracted laser emission is analyzed by an optical power meter, a FP spectrometer, and a 40 GHz electrical spectrum analyzer (ESA). Additionally, the power |Et |2 transmitted by the FP is measured. |Et |2 is detected by a large IR diode (2 mm by 2 mm area) placed behind the FP etalon. Optical Power Meter The power of the extracted optical signal is determined by a Noyes Fiber Systems OPM 5 optical power meter. The power meter detects the time-averaged absolute optical power: P(t) = |E(t)|2 , with E(t) the complex amplitude of the emitted optical ﬁeld.
Instead, the transmitted signal is monitored, and the laser emission is adjusted by a maximization of the transmitted power. A large-area infrared (IR) photodiode placed behind the FP detects the mean transmitted power |Et |2 . From the level of |Et |2 it is possible to conclude for the power |Eb |2 coupled back to the laser. Actually, only a ‘relative FP transmission’ can be measured. The detected ‘relative FP transmission’ is the spectrally integrated power transmitted by the FP, divided by the spectrally integrated power of the freerunning laser without FP, but in the same point of operation.
The value of F is determined by the selected etalon and cannot be inﬂuenced in measurement. 3) are well controllable by the experimentalist. 3) can be illustrated in Fourier space. The optical intensity spectrum |E(ω)|2 of a selfpulsation with period T is a comb of equidistant lines, separated by a frequency shift 2π/T (dashed lines in Fig. 12). The reﬂectivity spectrum |Er (ω)|2 /|Ei (ω)|2 of a FP interferometer with internal roundtrip time τ has equidistant minima (’resonances’), separated by 2π/τ (gray line in Fig.
All-Optical Noninvasive Delayed Feedback Control of Semiconductor Lasers by Sylvia Schikora