Large-mode-area photonic crystal fiber with double lattice constant structure and low bending loss

Napierała, Marek; Nasiłowski, Tomasz; Bereś-Pawlik, E.; Mergo, Paweł; Berghmans, Francis; Thienpont, Hugo

doi:10.1364/oe.19.022628

Cited by 53 publications

(25 citation statements)

References 15 publications

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“…1). Beyond a certain range of bend orientation angle, the fundamental mode would attenuate rapidly with high bend loss [11], [13]. Therefore, we employ the range of bend orientation angle in which the fiber still operates under SM as a factor to evaluate the bend property.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Fortunately, photonic crystal fibers (PCFs) break the contradiction between large mode field area and low bend loss due to the unique properties and remarkable flexibility in design. Since Knight firstly proposed a LMA PCF in 1998 [5], many endeavors have been made, such as leakage channel LMA PCF [6]- [8], ring-core LMA PCF [9], [10], asymmetric structure LMA PCF [11]- [13], and so on. Nevertheless, most LMA PCF designs with low bend loss are multimode or few-mode operation at bent state [8]- [10], [12], [14], only few LMA PCFs confirm to robust SM operation conditions at bend state [6], [11], [13].…”

Section: Introductionmentioning

confidence: 99%

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Rectangle Lattice Large Mode Area Photonic Crystal Fiber for 2 $\mu$m Compact High-power Fiber Lasers

Wang

Lou

2014

IEEE J. Select. Topics Quantum Electron.

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A rectangle lattice silica-host photonic crystal fiber with large mode area (LMA) is successfully fabricated for the first time. The introduction of rectangle lattice contributes to distinct leakage of second order modes and two large air holes provide an effective solution to suppress bend distortion. Numerical results demonstrate that a large mode field area (MFA) of 2500 μm 2 is achieved at the wavelength of 2 μm when the fiber is straight. While the fiber is bent to a radius of 30 cm, it confirms to single-mode (SM) operation conditions and the decrements of MFA at x polarization and y polarization are just 4.3% and 5%. Within a bend orientation angle of ±10 • and a wide wavelength range from 1.8 μm to 2.4 μm, the fiber can operate under single-mode (SM) conditions with low bend loss. LMA, SM operation, and small bend distortion make this fiber of great potential in developing 2 μm compact high-power fiber lasers.Index Terms-Rectangle lattice, large mode area, photonic crystal fiber, compact high-power laser.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rectangle Lattice Large Mode Area Photonic Crystal Fiber for 2 $\mu$m Compact High-power Fiber Lasers

Wang

Lou

2014

IEEE J. Select. Topics Quantum Electron.

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“…A multicore fiber consisting of 19 hexagonally arranged cores has been explored and it was measured that an effective mode area was of 465 m 2 for singlemode operation [4]. Napierała et al designed a PCF with double lattice constant structure, and it enables single mode operation with a mode area that reaches 1454 m 2 [5]. Limpert et al fabricated an extended single mode ytterbium-doped PCF with mode area of ∼2000 m 2 [6].…”

Section: Introductionmentioning

confidence: 99%

Very large mode area optical fiber with complex ring cores

Zhu

Duan

Yang

et al. 2014

Optik

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“…For high-power fiber lasers and amplifiers, improving mode area is a key target in current research on microstructure and solid LMA fibers. While much research has been developed to achieve very large mode areas fibers, many difficulties arise, such as bending losses, mode deformation, and high order modes suppression [1][2][3][4][5]. The main obstacle which remains difficult to confront in LMA fibers is bending distortion.…”

Section: Introductionmentioning

confidence: 99%

Efficient bending compensation of large mode area fiber

2014

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While much research has been developed to achieve very large mode areas (LMA) fibers, many difficulties arise, such as bending losses, mode deformation, and high order modes suppression. The main obstacle which remains difficult to confront in LMA fibers is bending distortion. When a conventional LMA fiber is coiled, it will generally suffer large bending distortion, and the mode area will contract accordingly, which would significantly affect laser or amplifier performances for some LMA fibers. In this report, we proposed a simple and efficient way for bending compensation in LMA fiber. A periodically etching structure is proposed to compensate the deformation, bending loss, and modecoupling effects in large mode area fibers. The numerical simulation results showed that the design not only efficiently improves the effective area, but also the fundamental mode bending loss is resistant. Without the structure, the bending losses are very low at large bending radius. When the bending radius reduces, there is a rapid increase of losses. In particular, for smaller bending radius (less than 20 cm), the fundamental mode deforms severely, and cannot normally transmit in the core. The numerical simulation results showed that the design not only efficiently improves the effective mode area, but also the fundamental mode bending loss is resistant. Even at bending radius as small as 5cm, the fundamental mode can transmit normally in the fiber with an increased mode area scaling. Furthermore, the LMA fiber with the structure can be flexibly manufactured by conventional fiber manufacturing approaches and recent etching technologies.

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Large-mode-area photonic crystal fiber with double lattice constant structure and low bending loss

Cited by 53 publications

References 15 publications

Rectangle Lattice Large Mode Area Photonic Crystal Fiber for 2 $\mu$m Compact High-power Fiber Lasers

Rectangle Lattice Large Mode Area Photonic Crystal Fiber for 2 $\mu$m Compact High-power Fiber Lasers

Very large mode area optical fiber with complex ring cores

Efficient bending compensation of large mode area fiber

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