Ultrathin endoscopes based on multicore fibers and adaptive optics: a status review and perspectives

Andresen, Esben Ravn; Sivankutty, Siddharth; Tsvirkun, Viktor; Bouwmans, Géraud; Rigneault, Hervé

doi:10.1117/1.jbo.21.12.121506

Cited by 53 publications

(47 citation statements)

References 76 publications

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“…In our earlier work we have shown how lensless endoscopes based on MCF (as opposed to MMF) simplify many of the considerations pertaining to the TM [19]. In particular, in Ref.…”

Section: Twisted Multi-core Fiber (Mcf)mentioning

confidence: 99%

Flexible lensless endoscope with a conformationally invariant multi-core fiber

Tsvirkun¹,

Sivankutty²,

Baudelle³

et al. 2019

Optica

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The lensless endoscope represents the ultimate limit in miniaturization of imaging tools: an image can be transmitted through a (multi-mode or multi-core) fiber by numerical or physical inversion of the fiber's premeasured transmission matrix. However, the transmission matrix changes completely with only minute conformational changes of the fiber, which has so far limited lensless endoscopes to fibers that must be kept static. In this letter we report for the first time a lensless endoscope which is exempt from the requirement of static fiber by designing and employing a custom-designed conformationally invariant fiber. We give experimental and theoretical validations and determine the parameter space over which the invariance is maintained.

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“…In our earlier work we have shown how lensless endoscopes based on MCF (as opposed to MMF) simplify many of the considerations pertaining to the TM [19]. In particular, in Ref.…”

Section: Twisted Multi-core Fiber (Mcf)mentioning

confidence: 99%

Flexible lensless endoscope with a conformationally invariant multi-core fiber

Tsvirkun¹,

Sivankutty²,

Baudelle³

et al. 2019

Optica

Self Cite

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“…Moreover, due to their low inter-core crosstalk levels, disordered MCFs exhibiting transverse Anderson localization 14,15 could also be proposed as a means to reduce the impact of the IMCD on some applications. In particular, disordered MCFs could be of extreme utility to improve the image quality in lensless endoscopy 50 . In the Supplementary Information we also analyse in Figs S4 and S5 the higher-order effects of the IMCD when including mode-coupling between orthogonal polarizations induced by the circular fiber birefringence.…”

Section: Resultsmentioning

confidence: 99%

Ultra-short pulse propagation model for multi-core fibers based on local modes

Macho

García-Meca

Fraile-Peláez

et al. 2017

Sci Rep

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Multi-core fibers (MCFs) have sparked a new paradigm in optical communications and open new possibilities and applications in experimental physics and other fields of science, such as biological and medical imaging. In many of these cases, ultra-short pulse propagation is revealed as a key factor that enables us to exploit the full potential of this technology. Unfortunately, the propagation of such pulses in real MCFs has not yet been modelled considering polarization effects or typical random medium perturbations, which usually give rise to both longitudinal and temporal birefringent effects. Using the concept of local modes, we develop here an accurate ultra-short pulse propagation model that rigorously accounts for these phenomena in single-mode MCFs. Based on this theory, we demonstrate analytically and numerically the intermodal dispersion between different LP01 polarized core modes induced by these random perturbations when propagating femtosecond pulses in the linear and nonlinear fiber regimes. The ever-decreasing core-to-core distance significantly enhances the intermodal dispersion induced by these birefringent effects, which can become the major physical impairment in the single-mode regime. To demonstrate the power of our model, we give explicit strategies to reduce the impact of this optical impairment by increasing the MCF perturbations.

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“…DTU Fotonik,Technical University of Denmark,Frederiksborgvej 399,4000 Roskilde,Denmark 3. SUPA,School of Physics and Astronomy,University of St Andrews,St Andrews,Fife,KY16 9SS,Scotland Lensless endoscopes provide means for delivery and collection of light to and from tissue without any need for additional optical elements at the fibre distal end [1]. This requires a comprehensive investigation of the optical beam propagation through the fibre, since any focussing or scanning at the sample site requires the beam to be shaped at the fibre proximal end.…”

Section: Numerical Comparison Of Robustness Of Multimode and Multicorementioning

confidence: 99%

Numerical Comparison of Robustness of Multimode and Multicore Fibre Sensitivity against Fibre Bending

Veettikazhy

Hansen

Marti

et al. 2019

2019 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

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Ultrathin endoscopes based on multicore fibers and adaptive optics: a status review and perspectives

Cited by 53 publications

References 76 publications

Flexible lensless endoscope with a conformationally invariant multi-core fiber

Flexible lensless endoscope with a conformationally invariant multi-core fiber

Ultra-short pulse propagation model for multi-core fibers based on local modes

Numerical Comparison of Robustness of Multimode and Multicore Fibre Sensitivity against Fibre Bending

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