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DY: Fachverband Dynamik und Statistische Physik

DY 6: Nonlinear Dynamics, Synchronization and Chaos

DY 6.4: Vortrag

Montag, 16. März 2020, 10:45–11:00, ZEU 147

Synchronization and Frequency Pulling in Mutually Coupled Mode-Locked Lasers — •Clara R. Roca-Sastre, Jakob Eberhardt, Stefan Meinecke, and Kathy Lüdge — Institut für Theoretische Physik, Technische Universität Berlin, Berlin, Germany

Monolithic passively mode-locked semiconductors lasers (PMLLs) are simple and compact sources of high-frequency ultra-short light pulses. These devices can be utilized in novel secure communication schemes or optical clock synchronization. However, due to the absence of an external reference clock, this class of MLLs exhibits higher timing jitter than their active counterparts [1]. In order to overcome this detrimental effect, a mutual all-optical coupling can be introduced to reduce the timing jitter. This technique also gives access to different synchronization regimes of the laser outputs. In pursuance of a better understanding of the synchronization regime, we model numerically a coupled system by using delay differential equations [3]. For the mutual coupling of two non-identical lasers, frequency pulling in addition to a wide range of interesting dynamics can be found. At delay times around half of the cold cavity roundtrip time and in an intermediate feedback strength regime, regions of leap frogging arise where the lasers show an effective doubling of the pulse repetition rate, emitting pulses alternately at the fundamental repetition frequency.

[1] Otto et al., New J. Phys. 14, 113033 (2012).

[2] Simos et al., IEEE JQE 54, 2001106 (2018)

[3] Vladimirov et al., Phys. Rev. A 72, 3, 033808 (2005).