Constant-curvature loss in monomode fibers: an experimental investigation

Sharma, Awuashilal B.; Al-Ani, A.-H.; Halme, Seppo J.

doi:10.1364/ao.23.003297

Cited by 55 publications

(18 citation statements)

References 13 publications

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“…The usual approach is to use a simplified formula introduced by Marcuse [1], applicable to weakly guided waveguides, including most optical fibers, for sufficiently large radii of curvature. This formula agrees well with experiment for single-mode fiber, after adjustments are made for bend-induced stress [2]. However, for multimode fiber it can be quite inaccurate [3].…”

Section: Introductionsupporting

confidence: 82%

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Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment

Schermer

Cole

2007

IEEE J. Quantum Electron.

361

129

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Abstract-This paper presents an improved curvature loss formula for optical waveguides, which is shown to accurately predict the bend loss of both single-mode and multimode fibers. The formula expands upon a previous formula derived by Marcuse, greatly improving its accuracy for the case of multimode fiber. Also presented are the results of bent fiber simulations using the beam propagation method (BPM), and experimental measurements of bend loss. Agreement among simulation, formula and measurement support the validity of both theoretical methods. BPM simulations showed that the lowest order modes of the bent fiber were reduced to their linearly polarized constituents prior to the onset of significant bend loss. This implies that certain LP mode orientations should propagate with much lower loss than previously expected, and should impact the mode stripping ability of bent large mode area fibers, as employed in fiber lasers and amplifiers.Index Terms-Dielectric waveguides, laser amplifiers, optical fiber amplifiers, optical fiber lasers, optical waveguide theory, waveguide bends.

show abstract

Section: Introductionsupporting

confidence: 82%

“…The bracketed term represents the net effects of bending, and the effective bend radius accounts for the dominant stress effects. Note that for silica fiber, [2], so stress actually counteracts the effects of bending compared to curvature alone [12].…”

Section: Bent Fiber Simulationmentioning

confidence: 99%

Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment

Schermer

Cole

2007

IEEE J. Quantum Electron.

361

129

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show abstract

“…The fact that the measured results do not display this wave-like variation support a conclusion that the inner coating layer absorbs most of the radiated field from the cladding. In the previous published investigations, the elastooptical correction or a so-called effective bending radius was required in order to make the calculated bend losses agree with experimental results [5][6][7]10,11], due to the refractive index change caused by the bending stress. Generally the relationship between effective bend radius eff R in modeling and actual bend radius R in experiments is R R eff 27 .…”

Section: Comparisons Between Theoretical and Experimental Resultsmentioning

confidence: 99%

Theoretical and experimental investigations of macro-bend losses for standard single mode fibers

Wang¹,

Farrell²,

Freir³

2005

Opt. Express

135

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Abstract:Modeling of macro-bend losses for single mode fibers with multiple cladding or coating layers is presented. Macro-bend losses for standard single mode fibers (SMF28) are investigated theoretically and experimentally, showing that the inner primary coating layer of SMF28 has a significant impact on the bend losses and most of the radiation field is absorbed in the inner primary coating layer of SMF28. The agreement between theoretical calculations and experimental measurements suggests that the so-called elastooptical correction in modeling is not required for SMF28.

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“…In prior work [10,11], an "effective bend radius" (R eff ) was introduced to fit the theoretically calculated bend losses to experimentally measured values. R eff is related to the measured bend radius (R exp ) by a wavelength-dependent elasto-optic correction factor that accounts for the change in refractive index induced by axial bending stress [11].…”

Section: Correction Factor For Bent 1060xp Fiber With Coating and Absmentioning

confidence: 99%

“…R eff is related to the measured bend radius (R exp ) by a wavelength-dependent elasto-optic correction factor that accounts for the change in refractive index induced by axial bending stress [11]. Fig.…”

Section: Correction Factor For Bent 1060xp Fiber With Coating and Absmentioning

confidence: 99%

Investigation of polarization‐dependent loss for a macrobending loss sensitive single‐mode fiber

Wang

Farrell

Semenova

et al. 2009

Micro & Optical Tech Letters

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Constant-curvature loss in monomode fibers: an experimental investigation

Cited by 55 publications

References 13 publications

Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment

Improved Bend Loss Formula Verified for Optical Fiber by Simulation and Experiment

Theoretical and experimental investigations of macro-bend losses for standard single mode fibers

Investigation of polarization‐dependent loss for a macrobending loss sensitive single‐mode fiber

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