Modal characteristics for W‐type and M‐type dielectric profile fibers

Neves, I. V.; Fernandes, Ângela

doi:10.1002/(sici)1098-2760(19990920)22:6<398::aid-mop10>3.3.co;2-0

Cited by 6 publications

(6 citation statements)

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“…A depressed core fiber (DCF) is a type of inversed index fibers, described by a three-layer fiber model with a low-index solid core, a finite high-index cladding, and surrounding air. This fiber structure is different from the M-type fiber [26], although in some papers it has been referred to as M-type fiber [27]. The refractive index of the central region of the M-type fiber has a minimum value set by the need for the core to have a refractive index equal to or lower than that of the surrounding medium, which if the surrounding region is air means that the core must also be air.…”

Section: Introductionmentioning

confidence: 99%

Anti-resonance, inhibited coupling and mode transition in depressed core fibers

Lian

Farrell

et al. 2020

Opt. Express

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The depressed core fiber (DCF), consisting of a low-index solid core, a high-index cladding and air surrounding, is in effect a bridge between the conventional step-index fiber and the tube-type hollow-core fiber from the point of view of the index profile. In this paper the dispersion diagram of a DCF is obtained by solving the full-vector eigenvalue equations and analyzed using the theory of anti-resonant and the inhibited coupling mechanisms. While light propagation in tube-type hollow-core fibers is commonly described by the symmetric planar waveguide model, here we propose an asymmetric planar waveguide for the DCFs in an anti-resonant reflecting optical waveguide (ARROW) model. It is found that the antiresonant core modes in the DCFs have real effective indices, compared to the anti-resonant core modes with complex effective indices in the tube-type hollow-core fibers. The antiresonant core modes in the DCFs exhibit similar qualitative and quantitative behavior as the core modes in the conventional step-index fibers. The full-vector analytical results for the simple-structure DCFs can contribute to a better understanding of the anti-resonant and inhibited coupling guidance mechanisms in other complex inversed index fibers.

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Section: Introductionmentioning

confidence: 99%

Anti-resonance, inhibited coupling and mode transition in depressed core fibers

Lian

Farrell

et al. 2020

Opt. Express

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“…We have selected the second option, and designed the core structure in such a way that the propagation loss at the Raman Stokes wavelength will be high while the loss at the signal wavelength will remain low. We have used a W-type fiber, which only guides light with wavelengths shorter than the cut-off wavelength of the fundamental LP 01 mode [13]. Light above that wavelength escapes from the core.…”

Section: Srs Suppression: Approach and Simulationsmentioning

confidence: 99%

Suppression of stimulated Raman scattering in a high power Yb-doped fiber amplifier using a W-type core with fundamental mode cut-off

Kim¹,

Dupriez²,

Codemard³

et al. 2006

Opt. Express

105

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We demonstrate the suppression of stimulated Raman scattering in a high power, single-mode Yb-doped fiber amplifier using a W-type core structure. Raman-scattered light is not guided by the core. The amplifier consists of a master oscillator power amplifier (MOPA) system, seeded with 103 ps pulses at 32 MHz repetition rate in the final amplification stage. An average output power of 53 W, which corresponds to 13 kW of peak power, was achieved in the 23 m long W-type double-clad fiber without any significant loss of power due to transfer from the signal wavelength at 1060 nm to the Raman Stokes wavelength at 1114 nm and amplified spontaneous emission from Yb-ions at longer wavelengths (~1070 nm). The power conversion efficiency at 1060 nm was 80% with respect to the absorbed pump power.

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“…To date, a number of various techniques and designs have been considered for the suppression of detrimental SRS, such as employing long-period gratings to attenuate the scattered beam [7]. Moreover, there were attempts to suppress SRS using special fibers, including resonant rings design [8]- [11], and photonic bandgap fibers [12]- [15]. However, in those designs, despite the Raman filtering due to the resonant coupling between core and cladding modes, the fiber bending must be carefully controlled, or only short fiber lengths are permitted.…”

Section: Introductionmentioning

confidence: 99%

Resonant SRS Filtering Fiber for High Power Fiber Laser Applications

Codemard

Vukovic

Chan

et al. 2018

IEEE J. Select. Topics Quantum Electron.

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We explore the properties of a novel stimulated Raman scattering (SRS) filtering fiber for high average or high peak optical power delivery applications. The fiber geometry is based on a series of circularly arranged high index rods embedded in a leaky silica cladding. The operation principle relies on the resonant coupling of the core and rod modes and the wavelength dependent leaking of the structure. The fabricated fiber demonstrated wide transmission window and filtering of SRS with extinction in excess of 20dB at the Raman Stokes wavelength, excellent robustness with bending, and high output beam quality. The fiber has been tested as a beam delivery fiber of a commercial pulsed fiber laser system in order to explore the filtering performance and its limitations.

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Modal characteristics for W‐type and M‐type dielectric profile fibers

Cited by 6 publications

References 0 publications

Anti-resonance, inhibited coupling and mode transition in depressed core fibers

Anti-resonance, inhibited coupling and mode transition in depressed core fibers

Suppression of stimulated Raman scattering in a high power Yb-doped fiber amplifier using a W-type core with fundamental mode cut-off

Resonant SRS Filtering Fiber for High Power Fiber Laser Applications

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