Single-mode Brillouin fiber laser passively stabilized at resonance frequency with self-injection locked pump laser

Abstract

We demonstrate a single-mode Brillouin fiber ring laser, which is passively stabilized at pump resonance frequency by using self-injection locking of semiconductor pump laser. Resonance condition for Stokes radiation is achieved by length fitting of Brillouin laser cavity. The laser generate singlefrequency Stokes wave with linewidth less than 0.5 kHz using approximately 17-m length cavity.

Locking of the DFB laser through fiber optic resonator on different coupling regimes

“…Such solutions are of particular interest for RF-generation and Brillouin sensing, since the same fiber configuration is able to generate additional waves, providing very high stability in the differences between the generating frequencies [8,12]. The transfer characteristics of the fiber cavities used in different configurations are altered and the minimal laser linewidth is as well varying from tens of kHz [11] down to hundreds of Hz [13]. However, the effect of the fiber cavity characteristics on the efficiency of self-injection locking in DFB laser has not been investigated, yet.…”

“…A huge Q-factor of cavities used in such systems ( $ 10 11 ) is not flexible for tuning. Alternatively, all-fiber cavity approach based on long, but relatively low-Q-factor cavities (Fabry-Perot [7] or ring ones [12,13]) is able to provide the similar laser linewidth employing low-cost fiber configuration built from standard telecom components. Such solutions are of particular interest for RF-generation and Brillouin sensing, since the same fiber configuration is able to generate additional waves, providing very high stability in the differences between the generating frequencies [8,12].…”

Fiber Laser for Phase-Sensitive Optical Time-Domain Reflectometry

“…To provide the DFB laser locking, a part of the optical radiation emitted by the DFB laser is passed through the filtering in a fiber ring resonator and returned into the laser cavity. This low-cost all-fiber solution allows achieving the laser linewidth as narrow as 500 Hz [36].…”

“…In our previous works, we have demonstrated substantial narrowing of the laser linewidth due to a spectrally selective feedback realized with FORR built from low-cost standard fiber telecom components [35][36][37]. To provide the DFB laser locking, a part of the optical radiation emitted by the DFB laser is passed through the filtering in a fiber ring resonator and returned into the laser cavity.…”

Ultra-narrow linewidth fiber laser with self-injection feedback based on Rayleigh backscattering

“…It can also be used as a seed laser to create the excellent microwave signal or as an optical frequency standard to measure the unknown light frequency accurately [1][2][3][4]. Up to now, several techniques are reported to realize SLM fiber laser, such as saturable absorber [5][6][7], short cavity [1,4,[8][9], mode selection elements [10][11], passive multiple ring cavities [12], or self-injection feedback [13] and so on. The 3dB linewidth of the laser can be compressed to ~1-2 kHz by using the above mentioned methods.…”