Active stabilization of the DFB laser injection-locked to an external fiber-optic ring resonator

Vasily V. Spirin, J.L. Bueno Escobedo, Krassimir Panayotov, P. Megret, Dmitry A. Korobko, Igor O. Zolotovskii, A.a. Fotiadi

Onderzoeksoutput: Conference paper


Spectrally pure lasers are the heart of precision high-end scientific and commercial applications. Self-injection locking of a DFB laser through an external feedback is one of the most promising mechanisms for the laser line narrowing. To provide the effect, a part of the optical radiation emitted by the laser is returned back into the laser cavity. This relatively simple technique allows to design cost-effective narrow-band laser sources based on standard laser diodes making them an attractive solution in comparison with conventional laser systems based on an active feedback. Recently, we have demonstrated significant line narrowing (similar to 1000 times) of a conventional low-cost DFB laser locked to an external fiber optic ring resonator. Once locking, any slow change of resonator mode frequency (due to temperature fluctuations, for example) leads to a simultaneous change of the laser generation frequency. However, in real conditions, in the presence of environment noise the stable laser operation in a single longitudinal mode occurs within a time interval limited to several seconds. These intervals are interrupted by short-time jumps in the lasing intensity caused by laser mode-hopping. Here, we report on linewidth narrowing and stabilization of semiconductor DFB laser implementing the self-injection locking in conjugation with an active optoelectronic feedback controlled by the simplest low-cost USB-DAQ card. In this assemble, the principle laser linewidth narrowing is provided by the self-injection-locking mechanism, whereas the applied active feedback helps to maintain this passive stabilization regime. Therefore, in terms of the feedback bandwidth, complexity, and allocated memory the proposed combined solution is much less consuming than active stabilization schemes based on the Pound-Drever-Hall (PDH) and Hansch-Couillaud methods commonly used with fiber lasers. Moreover, we will show that the active optoelectronic feedback which is initially implemented for better laser stabilization plays a second role granting control and tunability to laser linewidth.
Originele taal-2English
TitelActive stabilization of the DFB laser injection-locked to an external fiber-optic ring resonator
RedacteurenMarc Sciamanna, Rainer Michalzik, Krassimir Panajotov, Sven Hofling
Aantal pagina's9
ISBN van elektronische versie9781510634848
StatusPublished - 1 jan 2020
EvenementConference on Semiconductor Lasers and Laser Dynamics IX - ELECTR NETWORK
Duur: 6 apr 202010 apr 2020

Publicatie series

NaamProceedings of SPIE - The International Society for Optical Engineering
ISSN van geprinte versie0277-786X
ISSN van elektronische versie1996-756X


ConferenceConference on Semiconductor Lasers and Laser Dynamics IX


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