Abstract
We report on a polarimetry of harmonic mode-locked erbium-doped fiber laser with carbon nanotubes saturable absorber. We find new types of vector solitons with locked, switching and precessing states of polarization. The underlying physics presents interplay between birefringence of a laser cavity created by polarization controller along with light induced anisotropy caused by polarization hole burning.
Highlights
High repetition rate mode-locked fiber lasers (MLFLs) are of interest for telecommunication applications in the context of optical time-domain multiplexing, all-optical clock recovery [1], orthogonal frequency division multiplexing [2]
Higher repetition rates can be achieved in passive MLFLs by shortening cavity lengths below 20 cm [3], introducing comb filters [4], and increase of the pump power resulting in soliton breakup and harmonic mode-locking [5]
Polarization-locked vector solitons were obtained at all harmonics studied and fundamental mode-locking
Summary
High repetition rate mode-locked fiber lasers (MLFLs) are of interest for telecommunication applications in the context of optical time-domain multiplexing, all-optical clock recovery [1], orthogonal frequency division multiplexing [2]. Higher repetition rates can be achieved in passive MLFLs by shortening cavity lengths below 20 cm [3], introducing comb filters [4], and increase of the pump power resulting in soliton breakup and harmonic mode-locking [5]. In this paper we demonstrate experimentally, for the first time to our knowledge, polarization dynamics of harmonic mode-locked operation in erbium doped fiber laser with CNTs based saturable absorber. We reveal novel vector soliton types for multi-pulse and harmonic modelocked operation with locked, switched and precessing SOPs. The results can have potential applications for increased capacity in coherent communications using various polarizationbased modulation schemes, such as polarization division multiplexing, polarization switching, and modified coded hybrid subcarrier-amplitude-phase-polarization multiplexing [1, 2]. High flexibility in generation of dynamic polarization states can be of interest in secure communications [14], atoms and nanoparticles trapping [15], and control of magnetization [16]
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