Abstract
This paper details a theoretical modeling of Brillouin ring fiber laser which incorporates the interaction between multiple Brillouin Stokes signals. The ring cavity was pumped at several Brillouin pump (BP) powers and the output was measured through an optical coupler with various coupling ratios. The first-order Brillouin Stokes signal was saturated with the presence of the second-order Stokes signal in the cavity as a result of energy transfer between them. The outcome of the study found that the optimum point for the first-order Stokes wave performance is at laser power reduction of 10%. Resultantly, at the optimum output coupling ratio of 90%, the BFL was able to produce 19.2 mW output power at BP power and Brillouin threshold power of 60 and 21.3 mW respectively. The findings also exhibited the feasibility of the theoretical models application to ring-type Brillouin fiber laser of various design parameters.
Highlights
The rise of optical systems as the premier communication networks has attracted a lot of interest in fiber lasers
The erbium-doped fiber (EDF) was pumped by a 1480 nm laser diode for the amplification of seed signal from tunable laser source (TLS) to be used as the Brillouin pump (BP) signal prior to entering the ring cavity
Theoretical models of Brillouin fiber laser in a ring cavity were developed in this study
Summary
The rise of optical systems as the premier communication networks has attracted a lot of interest in fiber lasers. The 1st Stokes oscillates in the cavity and once it reaches a certain threshold, the same process repeats again generating another Stokes signal in the opposite direction This became the basis of multiwavelength laser, which is a very well known application of BFL. The integration of BFL with erbium is a popular choice due to the higher amplification accorded by the gain medium, which allows for higher Stoke power and simplifying the generation of subsequent Stokes signals. Work on this Brillouin-erbium fiber laser (BEFL) has found up to 24 channels in a general linear cavity design [6]. Investigation was done on the effect of second-order Stokes wave for the performance of BFL at various output coupling ratios
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