DUAL WAVELENGTH HIGH POWER DOUBLE-CLAD ERBIUM/YTTERBIUM-DOPED FIBER LASER

2011 ◽  
Vol 20 (04) ◽  
pp. 443-451
Author(s):  
M. R. A. MOGHADDAM ◽  
S. W. HARUN ◽  
S. SHAHI ◽  
H. AHMAD
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Wavelength Region ◽  
Dual Wavelength ◽  
Comb Filter ◽  
Mode Competition ◽  
Mode Suppression ◽  
Loop Mirror ◽  
Power Variance ◽  
Side Mode

A dual wavelength high power double-clad erbium/ytterbium-doped fiber laser with a narrowest spacing of 0.4 nm and a M2 value of close to unity is presented in the region of 1565 nm. This result can be realized with a significant improvement of the mode competition problem using a loop mirror as a comb filter. The wavelength region can also be varied using polarization controllers in the loop mirror. This dual-wavelength fiber laser with side mode suppression ratio (SMSR) of 40 dB is quite stable, and the output power variance is as low as 0.46 dB.

Tunable multi-wavelength thulium-doped fiber laser incorporating two-stage cascaded Sagnac loop comb filter

2016 ◽  
Vol 30 (21) ◽  
pp. 1650292 ◽  
Author(s):  
Lianqing Zhu ◽  
Wei He ◽  
Mingli Dong ◽  
Xiaoping Lou ◽  
Fei Luo
Keyword(s):  
Fiber Laser ◽  
Wavelength Division Multiplex ◽  
Comb Filter ◽  
Two Stage ◽  
Wavelength Division ◽  
Mode Suppression ◽  
Multi Wavelength ◽  
Polarization Maintaining ◽  
Simultaneous Adjustment ◽  
Side Mode

A tunable multi-wavelength narrow-linewidth thulium-doped fiber laser employing two-stage cascaded Sagnac loop mirrors is proposed and experimentally demonstrated. The designed fiber laser is composed of a pump source, wavelength division multiplex, circulator, thulium-doped fiber, polarization controllers (PCs), couplers and polarization-maintaining fibers (PMFs). Two cascaded Sagnac loops are used as the cavity reflector and filter, and the proposed filter is fabricated using two sections of PMFs with 2-m and 1-m lengths, respectively. In the experiment, the laser threshold is 110 mW, and laser can emit single, double, triple, quadruple and quintuple wavelengths in the spectral range of 1873–1901 nm through the simultaneous adjustment of the two PCs. The power fluctuations and 3-dB linewidth are less than 2.1 dB and 0.2 nm, respectively, over 10 min at room temperature, and the side-mode suppression ratio is greater than 20 dB. The proposed laser will be useful in various fields, such as spectral analysis, fiber sensing and optical communication.

scholarly journals Dual-wavelength thulium/holmium-doped fiber laser generation in 2 μm region with high side-mode suppression ratio

2019 ◽  
Vol 21 (4) ◽  
pp. 045701
Author(s):  
K Y Lau ◽  
N H Zainol Abidin ◽  
N A Cholan ◽  
A F Abas ◽  
M T Alresheedi ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Suppression Ratio ◽  
Dual Wavelength ◽  
Laser Generation ◽  
Side Mode Suppression Ratio ◽  
Mode Suppression ◽  
High Side ◽  
Side Mode

High-power dual-wavelength loop-mirror cavity fiber laser

2003 ◽  
Vol 39 (4) ◽  
pp. 286-287 ◽  
Author(s):  
F. Abdullah ◽  
M. A. Mahdi ◽  
B. Bouzid ◽  
M. K. Abdullah
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Dual Wavelength ◽  
Loop Mirror

Switchable dual-wavelength SLM narrow linewidth fiber laser based on nonlinear amplifying loop mirror

2018 ◽  
Vol 98 ◽  
pp. 56-60 ◽  
Author(s):  
Pan Fu ◽  
Xiao-qiang Feng ◽  
Baole Lu ◽  
Xin-yuan Qi ◽  
Haowei Chen ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Dual Wavelength ◽  
Narrow Linewidth ◽  
Loop Mirror ◽  
Nonlinear Amplifying Loop Mirror

High-power wavelength stabilized 970nm tilted cavity laser with a 41.3dB side mode suppression ratio

2007 ◽  
Vol 91 (24) ◽  
pp. 241112 ◽  
Author(s):  
L. Ya. Karachinsky ◽  
M. Kuntz ◽  
G. Fiol ◽  
V. A. Shchukin ◽  
N. N. Ledentsov ◽  
...  
Keyword(s):  
High Power ◽  
Suppression Ratio ◽  
Side Mode Suppression Ratio ◽  
Mode Suppression ◽  
Cavity Laser ◽  
Side Mode

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

2018 ◽  
Vol 8 (7) ◽  
pp. 1135 ◽  
Author(s):  
Anum Khattak ◽  
Gerard Tatel ◽  
Li Wei
Keyword(s):  
Fiber Laser ◽  
Single Mode ◽  
Polarization Controller ◽  
Dual Wavelength ◽  
Comb Filter ◽  
Multimode Fiber ◽  
Erbium Doped ◽  
Optical Fiber Sensing ◽  
The Difference ◽  
Spectral Ranges

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.

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

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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