Tunable Dual-Wavelength Thulium-Doped Fiber Laser by Employing a HB-FBG

Abstract

A novel tunable dual-wavelength thulium-doped fiber laser is demonstrated experimentally. The wavelengthtuning by employing a high birefringence fiber Bragg grating is proposed in 2-µm band lasing for the first time. By adjusting the polarization controller, stable dual-wavelength operation at the wavelengths of 1941.40 and 1942.21 nm is obtained. The optical signal-to-noise ratio is better than 48 dB. A 15.5% slope efficiency is achieved using a 90% output coupling ratio for laser extracting. The wavelength-tuning range in dual-wavelength operation is as wide as 6.93 nm.Index Terms-High birefringence fiber Bragg gratings, fiber lasers, wavelength-tuning.

Tunable dual-wavelength operation of an all-fiber thulium-doped fiber laser based on tunable fiber Bragg gratings

“…Different techniques have been proposed to reduce the competition based on the adjustment of intra-cavity losses. These techniques include the use of optical fiber devices such as polarization controllers (PCs) [7,8], variable optical attenuators (VOAs) [9], optical fiber interferometers [10][11][12][13], and narrow bandwidth filters [14].…”

“…Moreover, the wide gain spectrum of the TDF makes TDFLs attractive for their application as widely tunable laser sources in optical instrumentation, microwave photonics, and terahertz generation at the 2 μm region. Several methods to obtain tunable laser emission in TDFL have been reported, where the wavelength tuning of the generated laser line is based on different fiber devices such as Hi-Bi FBGs [14][15][16][17][18][19][20], tunable filters [21][22][23], fiber optical loop mirrors (FOLMs) [24,25], and PCs [26][27][28]. In this regard, FBGs have proved their reliability as spectral filters for wavelength selection and tuning in fiber laser approaches.…”

“…In this regard, FBGs have proved their reliability as spectral filters for wavelength selection and tuning in fiber laser approaches. When FBGs are used as spectral filters, the laser emission line is tuned by applying strain on the FBG [14,15]. Double-cladding thulium-doped fiber (DCTDF) is attractive for design of high power and high beam quality fiber laser systems and fiber amplifiers operating at 2 μm region.…”

Spectral characteristics study of phase-shifted fiber Bragg gratings under pressure applied perpendicular to fiber axis

“…В настоящее время оптическое волокно (ОВ) находит широкое применение в качестве среды передачи информации в волоконно-оптических линиях связи [1,2], активной среды лазеров [3,4], чувствительных элементов датчиков различных физических величин [5,6] и т.д. Изучение явления фоторефрактивности легированных волокон позволило использовать волокна с измененной структурой в оптических фильтрах, резонаторах, компенсаторах дисперсии, усилителях, датчиках повышенной точности и т.д.…”

2-μm switchable, tunable and power-controllable dual-wavelength fiber laser based on parallel cavities using 3 × 3 coupler

“…Corresponding to the properties, various methods have been proposed and reported, such as cascaded FBGs [7], highly birefringent (Hi-Bi) fiber loop mirrors [8], Sagnac loop mirror [9], fiber Bragg gratings (FBGs) written in Hi-Bi fibers [10,11], acoustic waves [12], spatial mode beating of multimode fiber [13] and cascaded filter structures [14]. However, multi-wavelength lasers in some special applications require the specific wavelength to be tunable or controllable, for instance, switching from one lasing line to another or two lasing lines at the same time.…”