Research on a novel composite structure Er^3+-doped DBR fiber laser with a π-phase shifted FBG

Zhao, Yuchen; Chang, Jun; Wang, Qingpu; Ni, Jiasheng; Song, Zi-Xia; Qi, Haifeng; Wang, Chang; Wang, Pengpeng; Gao, Liang; Sun, Zhihui; Lv, Guangping; Liu, Tongyu; Peng, Gang-Ding

doi:10.1364/oe.21.022515

Cited by 42 publications

(17 citation statements)

References 23 publications

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“…In addition, it is more accurate to calculate the linewidth of the fiber laser using the 20-dB bandwidth since the 3-dB bandwidth is too small to introduce calculation error. The 20-dB bandwidth achieved from the Lorentzian fit curve is 16.8 kHz, meaning that the real laser linewidth of the proposed EDFL is as narrow as 840 Hz since the laser linewidth is about 1/20 (1/2 √ 99) of the 20-dB bandwidth of the Lorentzian fit curve [22], [23].…”

Section: Experiments and Resultsmentioning

confidence: 95%

Stable Single-Longitudinal-Mode Fiber Laser With Ultra-Narrow Linewidth Based on Convex-Shaped Fiber Ring and Sagnac Loop

Wang

Shang

et al. 2019

IEEE Access

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In this investigation, a convex-shaped fiber ring (CSFR)-based single-longitudinal-mode (SLM) erbium-doped fiber laser (EDFL) is proposed and experimentally verified. The CSFR, composed of only two optical couplers and forming a double-ring architecture, is employed to serve as a high quality mode filter to eliminate the dense longitudinal modes of the EDFL. The unpumped erbium-doped fiber in the Sagnac loop is utilized to produce the ultra-narrowband auto-tracking filter effect as a saturable absorber to guarantee the SLM out. The experimental results show that the linewidth of the proposed EDFL is 840 Hz with a high optical signal to noise ratio of 63 dB. In addition, the stability of the EDFL with the maximum output power fluctuation of 0.01 dB and the maximum central wavelength variation of 0.01 nm, in both the short-term and the long-term observations. Hence, we obtained a SLM EDFL with extremely high stability, ultra-narrow linewidth and high optical signal to noise ratio (OSNR). INDEX TERMS Single longitudinal mode (SLM), erbium-doped fiber laser (EDFL), saturable absorber.

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Section: Experiments and Resultsmentioning

confidence: 95%

Stable Single-Longitudinal-Mode Fiber Laser With Ultra-Narrow Linewidth Based on Convex-Shaped Fiber Ring and Sagnac Loop

Wang

Shang

et al. 2019

IEEE Access

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“…where β is the propagation constant of the propagated light wave, and σ = βπ/Λ is the phase mismatch factor and 3 12 ( / )sin( ) At the same time the transfer matrix of the traditional (only index modulated) Bragg gratings is described by the following matrix (i = 1, 2):…”

Section: Transfer Matrix For Fabry-perot Cavity With a Single Pt-sbgmentioning

confidence: 99%

“…These modes are selected to lase due to their large spatial and spectral overlap when gain is placed into the resonator cavity. The recently proposed approach to add into a traditional FP cavity a filtering element in form of with a π-phase shifted FBG [12] to pass only a single lasing mode and block excitation of other longitudinal modes is a partial solution. The proposed DBR with the PT-SBG offers a distributed gain structure that produces very different mode lasing behavior, and a very different lasing threshold condition.…”

Section: Lasingmentioning

confidence: 99%

Novel optical characteristics of a Fabry-Perot resonator with embedded PT-symmetrical grating

Kulishov¹,

Kress²,

Jones³

2014

Opt. Express

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Abstract:We explore the optical properties of a Fabry-Perot resonator with an embedded Parity-Time (PT) symmetrical grating. This PTsymmetrical grating is non diffractive (transparent) when illuminated from one side and diffracting (Bragg reflection) when illuminated from the other side, thus providing a unidirectional reflective functionality. The incorporated PT-symmetrical grating forms a resonator with two embedded cavities. We analyze the transmission and reflection properties of these new structures through a transfer matrix approach. Depending on the resonator geometry these cavities can interact with different degrees of coherency: fully constructive interaction, partially constructive interaction, partially destructive interaction, and finally their interaction can be completely destructive. A number of very unusual (exotic) nonsymmetrical absorption and amplification behaviors are observed. The proposed structure also exhibits unusual lasing performance. Due to the PT-symmetrical grating, there is no chance of mode hopping; it can lase with only a single longitudinal mode for any distance between the distributed reflectors.

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“…Over decades, tremendous progress has been made in fiber Bragg gratings (FBGs) due to its extensive applications in optical fiber lasers [ 1 , 2 , 3 ], optical fiber communications [ 4 , 5 , 6 ] and single-point [ 7 , 8 , 9 ] or quasi-distributed [ 10 , 11 ] optical fiber sensing fields. For more recently, FBG arrays are widely employed in quasi-distributed sensing networks for long distance, online health monitoring of large structures [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Inscription of Fiber Bragg Grating Array with High-Energy Nanosecond-Pulsed Laser Talbot Interferometer

Zhang

et al. 2020

Sensors

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A high-energy nanosecond-pulsed ultraviolet (UV) laser Talbot interferometer for high-efficiency, mass production of fiber Bragg grating (FBG) array was experimentally demonstrated. High-quality FBG arrays were successfully inscribed in both H2-free and H2-loaded standard single-mode fibers (SMFs) with high inscription efficiency and excellent reproducibility. Compared with the femtosecond pulse that had a coherent length of several tens of micrometers, a longer coherent length (~10 mm) of the employed laser rendered a wider FBG wavelength versatility over 700 nm band (1200–1900 nm) without the need for optical path difference (OPD) compensation. Dense FBG array with center wavelength separation of ~0.4 nm was achieved and more than 1750 FBGs with separated center wavelength could be inscribed in a single H2-free or H2-loaded SMF in theory, which is promising for mass production of FBG arrays in industry. Moreover, precise focusing of laser beam was superfluous for the proposed system due to the high energy density of pulse. The proposed FBG inscription system was promising for industrialization production of dense FBG arrays.

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Research on a novel composite structure Er^3+-doped DBR fiber laser with a π-phase shifted FBG

Cited by 42 publications

References 23 publications

Stable Single-Longitudinal-Mode Fiber Laser With Ultra-Narrow Linewidth Based on Convex-Shaped Fiber Ring and Sagnac Loop

Stable Single-Longitudinal-Mode Fiber Laser With Ultra-Narrow Linewidth Based on Convex-Shaped Fiber Ring and Sagnac Loop

Novel optical characteristics of a Fabry-Perot resonator with embedded PT-symmetrical grating

High-Efficiency Inscription of Fiber Bragg Grating Array with High-Energy Nanosecond-Pulsed Laser Talbot Interferometer

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