By Sylvia Schikora
The stabilization of volatile states hidden within the dynamics of a approach, specifically the keep watch over of chaos, got a lot awareness within the final years. during this paintings, a widely known keep an eye on technique referred to as not on time suggestions keep an eye on 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 risky periodic country 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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Extra resources for All-Optical Noninvasive Delayed Feedback Control of Semiconductor Lasers
In a CO2 laser [CLMG99]. The application of the original DFC scheme to unstable stationary states is studied in [NPT95, SG98, AP04, HS05, YWHS06, DHS07]. Experimental applications range from a Mackey-glass system [NPT95] to electrochemical systems [PPKH02], and a chaotic frequency doubled Nd-doped yttrium aluminium garnet laser [AP04]. However, all these experiments employ electronic feedback loops, and all-optical realizations are not reported. The functional principle of DFC of an unstable stationary state can be illustrated by a linearized model that considers only the local properties of the target state [Ott].
18 2 All-Optical Control Setup Operation of the MSL Chips The MSL devices normally come as plug-and-play modules in a robust housing with optical and electrical connectors. In all-optical DFC, a major challenge is the reduction of the latency time τl . Thus, the FP must be placed extremely close to the MSL. For this reason, it is not possible to operate the lasers as modules here. Instead, direct access to one laser facet is necessary, requiring the MSL to be operated as bare chips (like in Fig.
Unfortunately, the emission shows large aperture angles of 20° and 40° FWHM in vertical and lateral direction, respectively. This requires thoroughly designed collimating devices. At one facet, the emission is collected by an especially customized tapered glass ﬁber with a cone-shaped end (see Fig. 10 and the photograph in Fig. 2). Then it is transported via a single stage isolator, yielding a feedback suppression of > 50 dB, and via ﬁber optic cables to the measurement devices. At the other facet, the output is coupled to the external FP cavity.