Tunable and Switchable Erbium-Doped Fiber Laser Using a Multimode-Fiber Based Filter

We demonstrated a compact tunable and switchable single/dual-wavelength erbium-doped fiber laser. The fiber laser can be tuned and switched from single-wavelength to dual-wavelength oscillation by using our recently proposed tunable comb filter. The comb filter consists of a section of multimode fiber (MMF) coiled into a polarization controller and two sections of single mode fibers (SMFs) to form a SMF/MMF/SMF structure, serving as a simple tunable all-fiber Mach-Zehnder interferometer. Due to the insertion of the MMF-based polarization controller (PC), an additional phase shift is introduced from the difference of the birefringence intensity in different dominant modes, which can be used to tune the fiber laser. In the experiment, by properly adjusting the PC, a tuning range of 9.3 nm can be achieved for the single-wavelength operation. Moreover, dual-wavelength operation with different free-spectral-ranges can be obtained. The tunable and switchable fiber lasers are of great importance for their applications in optical testing, optical fiber sensing, and signal processing.

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Continuously spacing-tunable dual-wavelength erbium-doped fiber laser based on polarization-dependent in-line multimode-single-mode-multimode fiber filter

Acta Physica Sinica ◽

10.7498/aps.68.20190297 ◽

2019 ◽

Vol 68 (15) ◽

pp. 154202

Author(s):

Wan-Jing Peng ◽

Peng Liu

Keyword(s):

Fiber Laser ◽

Single Mode ◽

Dual Wavelength ◽

Multimode Fiber ◽

Erbium Doped ◽

Fiber Filter

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Switchable and tunable linear cavity erbium-doped fiber laser based on FBGs embedded in Sagnac rings

Laser Physics ◽

10.1088/1555-6611/ac3512 ◽

2021 ◽

Vol 32 (1) ◽

pp. 015101

Author(s):

Gangxiao Yan ◽

Weihua Zhang ◽

Peng Li ◽

Qiuhao Jiang ◽

Meng Wu ◽

...

Keyword(s):

Fiber Laser ◽

Low Cost ◽

Single Mode ◽

Optical Signal ◽

Single Mode Fiber ◽

Hole Burning ◽

Linear Cavity ◽

Erbium Doped ◽

Optical Fiber Sensing ◽

Birefringence Effect

Abstract A switchable and tunable erbium-doped fiber laser with a linear cavity based on fiber Bragg gratings embedded in Sagnac rings is proposed and experimentally verified. Due to the stress birefringence effect and the polarized hole burning effect, which are introduced into the single-mode fiber in the polarization controllers (PCs) by the PCs, the designed laser can achieve seven kinds of laser-states output including three kinds of single-wavelength laser states, three kinds of dual-wavelength laser states and one kind of triple-wavelength laser state. The optical signal-to-noise ratios of the output wavelengths are all higher than 52 dB, and the wavelength shifts are all less than 0.04 nm. Furthermore, the temperature tuning of the wavelength range is also researched, which is about 1.2 nm. Due to advantages, such as low cost, simple structure, easy switching and multiple laser states, the designed laser has great application potential in laser radar, optical fiber sensing and so on.

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A Simple Mechanism to Suppress the Mode Competition for Stable and Tunable Dual-Wavelength Erbium-Doped Fiber Lasers

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.571.496 ◽

2012 ◽

Vol 571 ◽

pp. 496-499

Author(s):

Chen Fang Zhang ◽

Jiang Sun ◽

Si Wen Zheng ◽

Shui Sheng Jian

Keyword(s):

Polarization Controller ◽

Dual Wavelength ◽

Comb Filter ◽

Mode Competition ◽

Hole Burning ◽

Wavelength Shift ◽

Power Fluctuation ◽

Lasing Wavelength ◽

Erbium Doped ◽

Polarization Hole Burning

A suppressant effect for mode competition of dual-wavelength lasing oscillations induced by polarization hole burning effect in an ordinary erbium-doped fiber is proposed and experimentally demonstrated. The polarization hole burning effect is introduced by an all fiber polarization controller directly fused with a segment of erbium-doped fiber. The mechanism of the all fiber polarization controller to suppress the wavelength competition is described in detail. Results show that the mechanism is helpful to obtain stable dual-wavelength lasing oscillations at room temperature in the erbium-doped fiber laser. By adjusting the comb filter, the wavelength tuning between different dual-wavelength oscillations is realized. The side mode suppression ratio of each lasing wavelength is measured to be more than 55dB. The 3dB bandwidth of each lasing oscillation is 0.01nm and the 30dB bandwidth is 0.10nm. The power fluctuation and wavelength shift are measured to be less than 0.8dB and 0.05nm over 32 minutes for all the dual-wavelength lasing oscillations obtained in the experiment.

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