AbstractsPhysics

Statical and dynamical characteristics ofinjection-locked Fabry-Pérot laser diodes

by Marko M Krstić




Institution: Univerzitet u Beogradu
Department:
Year: 2016
Keywords: injekciona sinhronizacija; optiˇcka bistabilnost; amplitudski kontrolisana komutacija; fazno kontrolisana komutacija; vreme komutacije
Posted: 02/05/2017
Record ID: 2132466
Full text PDF: https://fedorabg.bg.ac.rs/fedora/get/o:12216/bdef:Content/get


Abstract

Photonics and Quantum Electronics - Optoelectronics and Photonics Communication / Fotonika i kvantna elektronika - Optoelektronika i fotonske komunikacije Injection locking is a nonlinear phenomenon in which two (or more) selfsustained oscillators can synchronize their oscillations, i.e., their operating frequencies and phases, provided that there exists some kind of coupling between them. This phenomenon can be observed in diverse disciplines such as mechanics, physics, engineering, even biology, psychology, etc. With development of electronics, injection locking has been used in a number of engineering applications comprising oscillators such as electrical or microwave, while recent breakthroughs in photonics paved the way for injection locking to be employed in optical systems such as lasers. Semiconductor lasers represent a kind of electrically driven self-sustained oscillators, which support electromagnetic oscillations inside the resonator cavity. By using various feedback mechanisms, the number of supported oscillations or modes can be controlled, providing single- or multi-mode operation of the laser. One of the sophisticated methods to control oscillations in one laser indeed relies on synchronization with another laser, i.e., on the technique of injection locking. In the case of injection-locked lasers, light from one, which is referred as “master” laser, is injected into the cavity of another (“slave”) laser, to provide for the coupling of the two oscillators. Under certain conditions, the slave laser can become stably locked to the frequency of the master one. In this technique, successful synchronization, i.e., stable locking of the two lasers, depends on injection parameters, which are the number of injected photons, (injection power), and the frequency detuning between the free-running frequencies of the master and slave lasers. The technique of injection locking has been proven to benefit laser dynamics, by increasing side-mode-suppression-ratio, thus providing single-mode operation, damping the relaxation oscillations, increasing the modulation bandwidth, reducing the linewidth and frequency chirping, etc. For that matter, injection-locked semiconductor lasers are proposed as cost-eective transmitter solutions in modern architectures of optical networks, such as wavelength division multiplexing passive optical networks, where injection-locked lasers can substitute for much more expensive tunable lasers, since their frequency, i.e., wavelength can be controlled via injection locking. On the other hand, injection locking in semiconductor lasers can lead to optical bistability, which can be employed in modern photonics integrated circuits, aiming for all-optical signal processing, tending to surpass the bottleneck imposed by the electronic layer in existing hybrid optical networks. Injection-locked optically bistable components can be used for realization of alloptical flip-flops, memories, switches, logic gates, for all-optical wavelength conversion and other fundamental building blocks of every… Advisors/Committee Members: Gvozdić, Dejan, 1964-.