Real-time characterisation of modal content in monolithic few-mode fibre lasers

Stutzki, Fabian; Jáuregui, César; Limpert, Jens; Tünnermann, Andreas

doi:10.1049/el.2010.3255

Cited by 11 publications

(1 citation statement)

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“…One possibility is to match the fiber modes to well-known resonator modes [10]. For active fibers, a fiber oscillator employing a fiber Bragg grating can be designed to map the effective indices of the modes into the wavelength space [11]. A very sensitive technique is given by low coherence interferometry [12].…”

Section: Introductionmentioning

confidence: 99%

Improved Modal Reconstruction for Spatially and Spectrally Resolved Imaging $({\rm S}^{2})$

Otto

Jansen

Stutzki

et al. 2013

J. Lightwave Technol.

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Spatially and spectrally resolved imaging (S2) is a very sensitive, robust and elegant method to measure the power of excited modes in a fiber. For the common reconstruction technique an approximation is necessary, which is based on dominant fundamental mode content. In this work we present several algorithms that significantly improve the accuracy of modal reconstruction for weak excited fundamental mode content. We show that in some cases general analytical solutions exist that can completely overcome the former limitation. In addition, we introduce an iterative procedure to improve the mode modal reconstruction independent of the specific used algorithm.Index Terms-Optical fiber applications, optical fibers, sensor phenomena and characterization.

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Section: Introductionmentioning

confidence: 99%