SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session III

HL 13.2: Poster

Tuesday, September 28, 2021, 13:30–16:30, P

Synchronization Properties in Coupled Mode-Locked Lasers — •Clara Rodríguez Roca-Sastre, Stefan Meinecke, and Kathy Lüdge — Institut für Theoretische Physik, Technische Universität, Berlin, Deutschland

Passively mode-locked semiconductor lasers (PMLLs) are simple and compact sources of high-frequency ultrashort light pulses. These devices can be used in novel secure communication schemes and for optical clock synchronization. However, due to the lack of an external reference clock, this class of MLLs exhibits higher timing jitter than their active counterparts [1]. To overcome this detrimental effect, mutual all-optical coupling can be introduced to reduce the timing jitter [2]. This technique also allows access to different synchronization regimes of the laser outputs. To better understand the synchronization regime, we numerically model a coupled system using delay differential equations [1]. Two coupled identical lasers pumped differently can operate with a high degree of in-phase and localized synchronization if one of them is driven in stable FML operation and the detuning between the devices is not too pronounced. Otherwise, the ML output collapses and complex dynamics such as multi-pulse dynamics may arise. The lasers then exhibit mode-locked pulses with a finite number of different intensities. In addition, regions of anti-phase dynamics appear at delay times around fractional integers of the laser resonance round-trip time.

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

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