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Tunable Spacing Dual-Wavelength Q-Switched Fiber Laser Based on Tunable FBG Device. PHOTONICS 2021. [DOI: 10.3390/photonics8120524] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A tunable spacing dual-wavelength Q-switched fiber laser is experimentally demonstrated based on a fiber Bragg grating tunable device incorporated in an erbium-doped fiber laser (EDFL). The system utilizes two identical fiber Bragg gratings (FBGs) at 1547.1 nm origin to enable two laser lines operation. The wavelength separations between two laser lines are controlled by fixing one of the FBGs while applying mechanical stretch and compression to the other one, using a fiber Bragg grating tunable device. The seven steps of wavelength spacing could be tuned from 0.3344 to 0.0469 nm spacing. Pulse characteristics for both close and wide spacing of dual-wavelength Q-switched fiber laser are successfully being recorded. The findings demonstrate the latest idea of dual-wavelength fiber laser based on FBG tunable device, which offers a wide range of future applications.
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Chen X, Dai D, Zhang Y, Wu H, Gao Y, Chen G, Wang Y. Wavelength-Flexible Thulium-Doped Fiber Laser Based on Digital Micromirror Array. MICROMACHINES 2020; 11:mi11121036. [PMID: 33255755 PMCID: PMC7760504 DOI: 10.3390/mi11121036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 11/13/2020] [Accepted: 11/21/2020] [Indexed: 06/12/2023]
Abstract
Wavelength-tunable thulium-doped fiber laser is demonstrated employing a digital micromirror device (DMD) in combination with a fixed grating. The diffraction property of four typical models of DMDs and its steering efficiency for the laser system are analyzed based on two-dimensional grating theory. By spatially modulating reflective patterns on a DMD, the stable, fast, and flexible tuning of lasing wavelength from 1930 nm to 2000 nm is achieved with wavelength tuning accuracy of 0.1 nm. The side-mode suppression ratio is larger than 50 dB around the 2 μm band with 3 dB linewidth less than 0.05 nm. The wavelength drift and power fluctuation are lower than 0.05 nm and 0.1 dB within 1 h at the room temperature, respectively.
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Ibarra-Escamilla B, Hernández-Arriaga MV, Durán-Sánchez M, Santiago-Hernández H, Bello-Jiménez M, Pérez ER, Rodríguez-Morales LA, Kuzin EA. Abrupt-tapered fiber filter arrangement for a switchable multi-wavelength and tunable Tm-doped fiber laser. OPTICS EXPRESS 2018; 26:14894-14904. [PMID: 30114794 DOI: 10.1364/oe.26.014894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 05/12/2018] [Indexed: 06/08/2023]
Abstract
A switchable and tunable multi-wavelength Tm-doped fiber laser is successfully demonstrated using a filter constructed with two tapered fiber elements in the cavity. The proposed system design uses a low-cost simple filter that allows stable dual, triple, quadruple, and quintuple-wavelength emission operation in the region around 1.9 μm. In the dual wavelength regime, the laser is capable of independently tuning each wavelength. For switching and tuning, a curvature is applied to the tapered fibers.
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Sun B, Luo J, Yan Z, Liu K, Ji J, Zhang Y, Wang QJ, Yu X. 1867-2010 nm tunable femtosecond thulium-doped all-fiber laser. OPTICS EXPRESS 2017; 25:8997-9002. [PMID: 28437973 DOI: 10.1364/oe.25.008997] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We propose and demonstrate a broadly wavelength tunable mode-locked thulium-doped all-fiber laser, delivering sub-400 femtosecond (fs) pulses and tuning from 1867 nm to 2010 nm. The tunable range of 143 nm, to our best knowledge, is the widest in the femtosecond mode-locked thulium-doped fiber lasers (TDFLs). The broadly tunable range and femtosecond pulse oscillation attribute to the large free spectral range and bandwidth of the fiber-based Lyot filter, benefiting from the hybrid device based compact configuration. The hybrid device, integrating wavelength-division-multiplexer, polarization-sensitive isolator and output coupler, effectively diminishes the birefringence and net dispersion.
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Yan Z, Sun B, Li X, Luo J, Shum PP, Yu X, Zhang Y, Wang QJ. Widely tunable Tm-doped mode-locked all-fiber laser. Sci Rep 2016; 6:27245. [PMID: 27263655 PMCID: PMC4893705 DOI: 10.1038/srep27245] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 04/27/2016] [Indexed: 11/25/2022] Open
Abstract
We demonstrated a widely tunable Tm-doped mode-locked all-fiber laser, with the widest tunable range of 136 nm, from 1842 to 1978 nm. Nonlinear polarization evolution (NPE) technique is employed to enable mode-locking and the wavelength-tunable operation. The widely tunable range attributes to the NPE-induced transmission modulation and bidirectional pumping mechanism. Such kind of tunable mode-locked laser can find various applications in optical communications, spectroscopy, time-resolved measurement, and among others.
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Affiliation(s)
- Zhiyu Yan
- Center for Optoelectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave, 639798, Singapore
- Precision Measurements Group, Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075, Singapore
| | - Biao Sun
- Precision Measurements Group, Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075, Singapore
| | - Xiaohui Li
- Center for Optoelectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave, 639798, Singapore
- School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, P.R. China
| | - Jiaqi Luo
- Center for Optoelectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave, 639798, Singapore
- Precision Measurements Group, Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075, Singapore
| | - Perry Ping Shum
- Center for Optoelectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave, 639798, Singapore
| | - Xia Yu
- Precision Measurements Group, Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075, Singapore
| | - Ying Zhang
- Precision Measurements Group, Singapore Institute of Manufacturing Technology, 71 Nanyang Drive, 638075, Singapore
| | - Qi Jie Wang
- Center for Optoelectronics and Biophotonics, School of Electrical and Electronic Engineering & The Photonics Institute, Nanyang Technological University, 50 Nanyang Ave, 639798, Singapore
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Jin X, Wang X, Wang X, Zhou P. Tunable multiwavelength mode-locked Tm/Ho-doped fiber laser based on a nonlinear amplified loop mirror. APPLIED OPTICS 2015; 54:8260-8264. [PMID: 26479593 DOI: 10.1364/ao.54.008260] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We propose and demonstrate a tunable multiwavelength mode-locked Tm/Ho-doped fiber laser based on a nonlinear amplified loop mirror (NALM). Without using polarization-maintaining fiber, only passive fibers with low birefringence were inserted into the NALM to help overcome mode competition and realize mode-locking. The spacing between adjacent channels was measured to be ∼6 nm. By adjusting the polarization controllers (PCs) to an appropriate position, self-started mode-locking was achieved, which further overcame the mode competition in the fiber laser. A multiwavelength mode-locked fiber laser with at least three available channels were tunable in the widest range of 30 nm (from 1935 to 1965 nm) with a 3 dB channel bandwidth of ∼1.6 nm. This multiwavelength mode-locked fiber laser is quite stable with the maximum peak fluctuation within 0.47 dB in long-term observations.
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Shao Z, Qiao X, Rong Q, Su D. Generation of dual-wavelength square pulse in a figure-eight erbium-doped fiber laser with ultra-large net-anomalous dispersion. APPLIED OPTICS 2015; 54:6711-6716. [PMID: 26368084 DOI: 10.1364/ao.54.006711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A type of wave-breaking-free mode-locked dual-wavelength square pulse was experimentally observed in a figure-eight erbium-doped fiber laser with ultra-large net-anomalous dispersion. A 2.7 km long single-mode fiber (SMF) was incorporated as a nonlinear optical loop mirror (NOLM) and provided largely nonlinear phase accumulation and anomalous dispersion, which enhanced the four-wave-mixing effect to improve the stability of the dual-wavelength operation. In the NOLM, the long SMF with small birefringence supported the Sagnac interference as a filter to manage the dual-wavelength lasing. The dual-wavelength operation was made switchable by adjusting the intra-cavity polarization loss and phase delay corresponding to two square pulses. When the pump power was increased, the duration of the square pulse increased continuously while the peak pulse power gradually decreased. This square-type pulse can potentially be utilized for signal transmission and sensing.
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