Improvement of Coiling Mode to Suppress Higher-Order-Modes by Considering Mode Coupling for Large-Mode-Area Fiber Laser

Li, J.; Wang, Jun; Feng, Jing

doi:10.1163/156939310791586070

Cited by 7 publications

(6 citation statements)

References 20 publications

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“…Nowadays, majority of studies were carried out to show that both the TMI and IM-FWM can be suppressed by the reduction of bending diameter which can enhance the loss of high-order modes [14], [15]. However, considering the bend-induced coupling will be relieved with the increment of bending diameter [42], [43], it is interesting how these two thresholds will be varied by increasing Fig. 7.…”

Section: Im-fwm and Tmi Under Different Bending Diametermentioning

confidence: 99%

“…To the best of our knowledge, this is the first demonstration on the positive effect of increasing the bending diameter on the suppression of IM-FWM. Such a result may be induced by the bending-dependent mode coupling which can enhance the high-order mode [42]- [45], if the bending diameter is not small enough to loss the high-order mode.…”

Section: Im-fwm and Tmi Under Different Bending Diametermentioning

confidence: 99%

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Experimental Investigations on TMI and IM-FWM in Distributed Side-Pumped Fiber Amplifier

et al. 2020

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The intermodal four-wave mixing (IM-FWM) and transversal mode instabilities (TMI) are experimentally studied in high-power distributed side-pumped fiber amplifiers. To the best of our knowledge, we have made the first demonstration of TMI and IM-FWM which can be suppressed simultaneously by increasing the bending diameter. Besides, the experimental results show that the counter-pumping scheme is beneficial to suppress both of IM-FWM and TMI, when comparing with co-pumping scheme. Furthermore, these two effects cannot be observed when the M 2 factor is lower than 1.3, which can give a condition to estimate whether these two effects should be considered or not. The pertinent study can provide some guidance for understanding TMI and IM-FWM in the high-power fiber laser and amplifier.

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Section: Im-fwm and Tmi Under Different Bending Diametermentioning

confidence: 99%

Section: Im-fwm and Tmi Under Different Bending Diametermentioning

confidence: 99%

Experimental Investigations on TMI and IM-FWM in Distributed Side-Pumped Fiber Amplifier

et al. 2020

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“…For a DC-PCF with a length (z), suppose that the power of the injected light on the input side of the fiber core-A and the fiber core-B is 1 and 0, respectively. According to the conventional coupled-mode theory [69][70][71][72][73], the output power on the output side of the fiber core-A and the fiber core-B of the DC-PCF Output spectra (from fiber core-B) of the 10-cm DC-PCF when the (x-) bending curvature is 0, 4, 7, 10, and 12 m −1 , respectively.…”

Section: Structure Principle and Performancementioning

confidence: 99%

Bending Analysis of a Dual-Core Photonic Crystal Fiber

Chen¹,

Hu²,

Liu

et al. 2011

PIER

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Abstract-A dual-core photonic crystal fiber (DC-PCF) is proposed, and bending characteristics of the DC-PCF are investigated. Two fiber cores are employed in the cross-section of the DC-PCF, which result in a mode coupling between the two fiber cores when the light propagates inside the DC-PCF. The mode coupling between two fiber cores of the DC-PCF is sensitive to the directional bending of the DC-PCF which essentially provides a method to achieve bending sensing. A DC-PCF-based bending sensor is proposed by injecting a broadband light into one fiber core of the DC-PCF on one side and detecting output spectrum from another fiber core of the DC-PCF on the other side. In our simulations, a parabola curve which shows the relationship between the wavelength shift of the transmission spectrum of the DC-PCF-based bending sensor and the bending curvature of the DC-PCF is presented.

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“…More recently, several microstructured fibers (MSFs) (i.e., photonic crystal fibers (PCFs)) were also proposed for pressure sensing [13][14][15][16][17][18][19][20][21][22]. Thanks to the design flexibility of the cross-section, MSFs have achieved excellent properties in birefringence [23][24][25][26][27][28][29], dispersion [30][31][32][33][34], single polarization single mode [35][36][37], nonlinearity [38], and effective mode area [39][40][41] over the past several years. MSFs have shown some advantages for applications in optical fiber sensors, such as temperature insensitivity for strain sensing, high sensitivity for pressure sensing and so on.…”

Section: Introductionmentioning

confidence: 99%

Highly Birefringent Four-Hole Fiber for Pressure Sensing

Chen¹,

Tse²,

Wu³

et al. 2011

PIER

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Abstract-A highly birefringent four-hole fiber (FHF) with a pair of large air holes and a pair of small air holes are proposed for air/hydrostatic pressure sensing. The birefringence of the FHF can be up to 0.01 due to the rectangle-like fiber core surrounded by four air holes. Therefore, a FHF with a length of only several centimeters is required for high-sensitivity pressure sensing based on a Sagnac interferometer. Optical properties of the FHF such as effective index and birefringence are investigated. Pressure sensor based on the FHF depends on the pressure-induced refractive index change or pressureinduced birefringence. The stress distribution of the FHF subjected to an air/hydrostatic pressure is represented. Simulations show that the principal stress component parallel to the slow axis of the of the FHF under the air/hydrostatic pressure is greatly enhanced due to the existence of two large air holes, which consequently results in a high sensitivity of the FHF-based pressure sensor. Relationships between the pressure-induced birefirngence and the radius of the large air hole, the external diameter of the FHF, or the ellipticity of the elliptical FHF are investigated. The polarimetric pressure sensitivity of the FHF can be up to 607 rad/MPa/m.

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Improvement of Coiling Mode to Suppress Higher-Order-Modes by Considering Mode Coupling for Large-Mode-Area Fiber Laser

Cited by 7 publications

References 20 publications

Experimental Investigations on TMI and IM-FWM in Distributed Side-Pumped Fiber Amplifier

Experimental Investigations on TMI and IM-FWM in Distributed Side-Pumped Fiber Amplifier

Bending Analysis of a Dual-Core Photonic Crystal Fiber

Highly Birefringent Four-Hole Fiber for Pressure Sensing

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