## Multicore Fiber

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### Axel Schülzgen - One of the best experts on this subject based on the ideXlab platform.

• ##### bending sensor combining Multicore Fiber with a mode selective photonic lantern
Optics Letters, 2015
Co-Authors: Amy Van Newkirk, Jacques Albert, J E Antoniolopez, A M Velazquezbenitez, Rodrigo Amezcuacorrea, Axel Schülzgen
Abstract:

A bending sensor is demonstrated using the combination of a mode-selective photonic lantern (PL) and a Multicore Fiber. A short section of three-core Fiber with strongly coupled cores is used as the bend sensitive element. The supermodes of this Fiber are highly sensitive to the refractive index profiles of the cores. Small bend-induced changes result in drastic changes of the supermodes, their excitation, and interference. The Multicore Fiber is spliced to a few-mode Fiber and excites bend dependent amounts of each of the six linearly polarized (LP) modes guided in the few-mode Fiber. A mode selective PL is then used to demultiplex the modes of the few-mode Fiber. Relative power measurements at the single-mode PL output ports reveal a high sensitivity to bending curvature and differential power distributions according to bending direction, without the need for spectral measurements. High direction sensitivity is demonstrated experimentally as well as in numerical simulations. Relative power shifts of up to 80% have been measured at radii of approximately 20 cm, and good sensitivity was observed with radii as large as 10 m, making this sensing system useful for applications requiring both large and small curvature measurements.

• ##### 3D Bending Sensor Combining Multicore Fiber with a Mode-Selective Photonic Lantern
2015
Co-Authors: Amy Van Newkirk, A. M. Velazquez-benitez, Jose Enrique Antonio-lopez, Jacques Albert, Rodrigo Amezcua Correa, Axel Schülzgen
Abstract:

A bending sensor is demonstrated using the combination of a mode-selective photonic lantern and a Multicore Fiber, for simultaneous measurements of bending direction and radius of curvature.

• ##### Multicore Fiber sensors for simultaneous measurement of force and temperature
IEEE Photonics Technology Letters, 2015
Abstract:

We demonstrate a force and temperature sensor consisting of a Multicore Fiber (MCF) spliced between two single-mode Fibers. Increasing of the sensitivity to applied force is achieved through etching of the MCF cladding, with an overall increase of $7\times$ compared with a 125- $\mu \text{m}$ MCF device, and $12\times$ compared with a standard Fiber Bragg grating (FBG). Simultaneous decoupling of force and temperature with high accuracy is demonstrated using two MCF sections with different outer diameters. This device has robust operation up to 1000 °C, making it more suitable than FBGs for extreme environments.

• ##### Optimization of Multicore Fiber for high-temperature sensing
Optics letters, 2014
Co-Authors: Amy Van Newkirk, Enrique Antonio-lopez, G. Salceda-delgado, Rodrigo Amezcua-correa, Axel Schülzgen
Abstract:

We demonstrate a novel high-temperature sensor using Multicore Fiber (MCF) spliced between two single-mode Fibers. Launching light into such Fiber chains creates a supermode interference pattern in the MCF that translates into a periodic modulation in the transmission spectrum. The spectrum shifts with changes in temperature and can be easily monitored in real time. This device is simple to fabricate and has been experimentally shown to operate at temperatures up to 1000°C in a very stable manner. Through simulation, we have optimized the Multicore Fiber design for sharp spectral features and high overall transmission in the optical communications window. Comparison between the experiment and the simulation has also allowed determination of the thermo-optic coefficient of the MCF as a function of temperature.

• ##### Multicore Fiber sensor for high temperature applications up to 1000 c
Optics Letters, 2014
Co-Authors: Enrique J Antoniolopez, Axel Schülzgen, Zeinab Sanjabi Eznaveh, Patrick Likamwa, Rodrigo Amezcuacorrea
Abstract:

A novel high temperature sensor based on customized Multicore Fiber (MCF) is proposed and experimentally demonstrated. The sensor consists of a short, few-centimeter-long segment of MCF spliced between two standard single-mode Fibers. Due to interference effects, the transmission spectrum through this Fiber chain features sharp and deep notches. Exposing the MCF segment to increasing temperatures of up to 1000°C results in a shift of the transmission notches toward longer wavelengths with a slope of approximately 29  pm/°C at lower temperatures and 52  pm/°C at higher temperatures, enabling temperature measurements with high sensitivity and accuracy. Due to its compact size and mechanical rigidity, the MCF sensor can be subjected to harsh environments. The fabrication of the MCF sensor is straightforward and reproducible, making it an inexpensive Fiber device.

### Hervé Rigneault - One of the best experts on this subject based on the ideXlab platform.

• ##### Nonlinear imaging through a Fermat's golden spiral Multicore Fiber.
Optics letters, 2018
Co-Authors: Siddharth Sivankutty, Viktor Tsvirkun, Esben Ravn Andresen, Géraud Bouwmans, Olivier Vanvincq, Hervé Rigneault
Abstract:

We report two-photon lensless imaging through a novel golden spiral Multicore Fiber. This unique layout optimizes the sidelobe levels, field of view, cross-talk, group delay and mode density to achieve a sidelobe contrast of atleast 10.9 dB. We demonstrate experimentally the ability to generate and scan a focal point with a femtosecond pulse and perform two-photon imaging.

• ##### Nonlinear imaging through a Fermat’s golden spiral Multicore Fiber
Optics Letters, 2018
Co-Authors: Siddharth Sivankutty, Viktor Tsvirkun, Esben Ravn Andresen, Géraud Bouwmans, Olivier Vanvincq, Hervé Rigneault
Abstract:

We report two-photon lensless imaging through a novel golden spiral Multicore Fiber. This unique layout optimizes the sidelobe levels, field of view, cross-talk, group delay and mode density to achieve a sidelobe contrast of atleast 10.9 dB. We demonstrate experimentally the ability to generate and scan a focal point with a femtosecond pulse and perform two-photon imaging.

• ##### single shot polarimetry imaging of Multicore Fiber
Optics Letters, 2016
Co-Authors: Siddharth Sivankutty, Esben Ravn Andresen, Géraud Bouwmans, Thomas G Brown, Miguel A Alonso, Hervé Rigneault
Abstract:

We report an experimental test of single-shot polarimetry applied to the problem of real-time monitoring of the output polarization states in each core within a Multicore Fiber bundle. The technique uses a stress-engineered optical element, together with an analyzer, and provides a point spread function whose shape unambiguously reveals the polarization state of a point source. We implement this technique to monitor, simultaneously and in real time, the output polarization states of up to 180 single-mode Fiber cores in both conventional and polarization-maintaining Fiber bundles. We demonstrate also that the technique can be used to fully characterize the polarization properties of each individual Fiber core, including eigen-polarization states, phase delay, and diattenuation.

• ##### single shot polarimetry imaging of Multicore Fiber
arXiv: Optics, 2016
Co-Authors: Siddharth Sivankutty, Esben Ravn Andresen, Géraud Bouwmans, Thomas G Brown, Miguel A Alonso, Hervé Rigneault
Abstract:

We report an experimental test of single-shot polarimetry applied to the problem of real-time monitoring of the output polarization states in each core within a Multicore Fiber bundle. The technique uses a stress-engineered optical element together with an analyzer and provides a point spread function whose shape unambiguously reveals the polarization state of a point source. We implement this technique to monitor, simultaneously and in real time, the output polarization states of up to 180 single mode Fiber cores in both conventional and polarization-maintaining bundles. We demonstrate also that the technique can be used to fully characterize the polarization properties of each individual ber core including eigen-polarization states, phase delay and diattenuation.

### Siddharth Sivankutty - One of the best experts on this subject based on the ideXlab platform.

• ##### Nonlinear imaging through a Fermat's golden spiral Multicore Fiber.
Optics letters, 2018
Co-Authors: Siddharth Sivankutty, Viktor Tsvirkun, Esben Ravn Andresen, Géraud Bouwmans, Olivier Vanvincq, Hervé Rigneault
Abstract:

We report two-photon lensless imaging through a novel golden spiral Multicore Fiber. This unique layout optimizes the sidelobe levels, field of view, cross-talk, group delay and mode density to achieve a sidelobe contrast of atleast 10.9 dB. We demonstrate experimentally the ability to generate and scan a focal point with a femtosecond pulse and perform two-photon imaging.

• ##### Nonlinear imaging through a Fermat’s golden spiral Multicore Fiber
Optics Letters, 2018
Co-Authors: Siddharth Sivankutty, Viktor Tsvirkun, Esben Ravn Andresen, Géraud Bouwmans, Olivier Vanvincq, Hervé Rigneault
Abstract:

We report two-photon lensless imaging through a novel golden spiral Multicore Fiber. This unique layout optimizes the sidelobe levels, field of view, cross-talk, group delay and mode density to achieve a sidelobe contrast of atleast 10.9 dB. We demonstrate experimentally the ability to generate and scan a focal point with a femtosecond pulse and perform two-photon imaging.

• ##### Phase retrieval in Multicore Fiber bundles
Optics letters, 2017
Co-Authors: Dani Kogan, Siddharth Sivankutty, Viktor Tsvirkun, Gï¿½raud Bouwmans, Esben Ravn Andresen, Hervï¿½ Rigneault, Dan Oron
Abstract:

Multicore Fiber bundles are widely used in endoscopy due to their miniature size and their direct imaging capabilities. They have recently been used, in combination with spatial light modulators, in various realizations of endoscopy with little or no optics at the distal end. These schemes require characterization of the relative phase offsets between the different cores, typically done using off-axis holography, thus requiring both an interferometric setup and, typically, access to the distal tip. Here we explore the possibility of employing phase retrieval to extract the necessary phase information. We show that in the noise-free case, disordered Fiber bundles are superior for phase retrieval over their periodic counterparts, and demonstrate experimentally accurate retrieval of phase information for up to 10 simultaneously illuminated cores. Thus, phase retrieval is presented as a viable alternative for real-time monitoring of phase distortions in Multicore Fiber bundles.

• ##### Widefield lensless endoscopy with a Multicore Fiber
Optics letters, 2016
Co-Authors: Viktor Tsvirkun, Siddharth Sivankutty, Esben Ravn Andresen, Géraud Bouwmans, Ori Katz, Hervï¿½ Rigneault
Abstract:

We demonstrate pixelation-free real-time widefield endoscopic imaging through an aperiodic Multicore Fiber (MCF) without any distal opto-mechanical elements or proximal scanners. Exploiting the memory effect in MCFs the images in our system are directly obtained without any post-processing using a static wavefront correction obtained from a single calibration procedure. Our approach allows for video-rate 3D widefield imaging of incoherently illuminated objects with imaging speed not limited by the wavefront shaping device refresh rate.

• ##### single shot polarimetry imaging of Multicore Fiber
Optics Letters, 2016
Co-Authors: Siddharth Sivankutty, Esben Ravn Andresen, Géraud Bouwmans, Thomas G Brown, Miguel A Alonso, Hervé Rigneault
Abstract:

We report an experimental test of single-shot polarimetry applied to the problem of real-time monitoring of the output polarization states in each core within a Multicore Fiber bundle. The technique uses a stress-engineered optical element, together with an analyzer, and provides a point spread function whose shape unambiguously reveals the polarization state of a point source. We implement this technique to monitor, simultaneously and in real time, the output polarization states of up to 180 single-mode Fiber cores in both conventional and polarization-maintaining Fiber bundles. We demonstrate also that the technique can be used to fully characterize the polarization properties of each individual Fiber core, including eigen-polarization states, phase delay, and diattenuation.

### Esben Ravn Andresen - One of the best experts on this subject based on the ideXlab platform.

• ##### Nonlinear imaging through a Fermat's golden spiral Multicore Fiber.
Optics letters, 2018
Co-Authors: Siddharth Sivankutty, Viktor Tsvirkun, Esben Ravn Andresen, Géraud Bouwmans, Olivier Vanvincq, Hervé Rigneault
Abstract:

We report two-photon lensless imaging through a novel golden spiral Multicore Fiber. This unique layout optimizes the sidelobe levels, field of view, cross-talk, group delay and mode density to achieve a sidelobe contrast of atleast 10.9 dB. We demonstrate experimentally the ability to generate and scan a focal point with a femtosecond pulse and perform two-photon imaging.

• ##### OFC - Few-mode and Multicore Fiber Amplifiers Technology for SDM
Optical Fiber Communication Conference, 2018
Co-Authors: Laurent Bigot, Esben Ravn Andresen, Jean-baptiste Trinel, Géraud Bouwmans, Yves Quiquempois
Abstract:

The optical performances of few-mode and Multicore Fiber amplifiers will strongly influence the future of SDM for long-haul transmission. We review this topic with a special focus on a new generation of few-mode erbium-doped Fiber.

• ##### Nonlinear imaging through a Fermat’s golden spiral Multicore Fiber
Optics Letters, 2018
Co-Authors: Siddharth Sivankutty, Viktor Tsvirkun, Esben Ravn Andresen, Géraud Bouwmans, Olivier Vanvincq, Hervé Rigneault
Abstract:

We report two-photon lensless imaging through a novel golden spiral Multicore Fiber. This unique layout optimizes the sidelobe levels, field of view, cross-talk, group delay and mode density to achieve a sidelobe contrast of atleast 10.9 dB. We demonstrate experimentally the ability to generate and scan a focal point with a femtosecond pulse and perform two-photon imaging.

• ##### Phase retrieval in Multicore Fiber bundles
Optics letters, 2017
Co-Authors: Dani Kogan, Siddharth Sivankutty, Viktor Tsvirkun, Gï¿½raud Bouwmans, Esben Ravn Andresen, Hervï¿½ Rigneault, Dan Oron
Abstract:

Multicore Fiber bundles are widely used in endoscopy due to their miniature size and their direct imaging capabilities. They have recently been used, in combination with spatial light modulators, in various realizations of endoscopy with little or no optics at the distal end. These schemes require characterization of the relative phase offsets between the different cores, typically done using off-axis holography, thus requiring both an interferometric setup and, typically, access to the distal tip. Here we explore the possibility of employing phase retrieval to extract the necessary phase information. We show that in the noise-free case, disordered Fiber bundles are superior for phase retrieval over their periodic counterparts, and demonstrate experimentally accurate retrieval of phase information for up to 10 simultaneously illuminated cores. Thus, phase retrieval is presented as a viable alternative for real-time monitoring of phase distortions in Multicore Fiber bundles.

• ##### Widefield lensless endoscopy with a Multicore Fiber
Optics letters, 2016
Co-Authors: Viktor Tsvirkun, Siddharth Sivankutty, Esben Ravn Andresen, Géraud Bouwmans, Ori Katz, Hervï¿½ Rigneault
Abstract:

We demonstrate pixelation-free real-time widefield endoscopic imaging through an aperiodic Multicore Fiber (MCF) without any distal opto-mechanical elements or proximal scanners. Exploiting the memory effect in MCFs the images in our system are directly obtained without any post-processing using a static wavefront correction obtained from a single calibration procedure. Our approach allows for video-rate 3D widefield imaging of incoherently illuminated objects with imaging speed not limited by the wavefront shaping device refresh rate.

### Géraud Bouwmans - One of the best experts on this subject based on the ideXlab platform.

• ##### Nonlinear imaging through a Fermat's golden spiral Multicore Fiber.
Optics letters, 2018
Co-Authors: Siddharth Sivankutty, Viktor Tsvirkun, Esben Ravn Andresen, Géraud Bouwmans, Olivier Vanvincq, Hervé Rigneault
Abstract:

We report two-photon lensless imaging through a novel golden spiral Multicore Fiber. This unique layout optimizes the sidelobe levels, field of view, cross-talk, group delay and mode density to achieve a sidelobe contrast of atleast 10.9 dB. We demonstrate experimentally the ability to generate and scan a focal point with a femtosecond pulse and perform two-photon imaging.

• ##### OFC - Few-mode and Multicore Fiber Amplifiers Technology for SDM
Optical Fiber Communication Conference, 2018
Co-Authors: Laurent Bigot, Esben Ravn Andresen, Jean-baptiste Trinel, Géraud Bouwmans, Yves Quiquempois
Abstract:

The optical performances of few-mode and Multicore Fiber amplifiers will strongly influence the future of SDM for long-haul transmission. We review this topic with a special focus on a new generation of few-mode erbium-doped Fiber.

• ##### Nonlinear imaging through a Fermat’s golden spiral Multicore Fiber
Optics Letters, 2018
Co-Authors: Siddharth Sivankutty, Viktor Tsvirkun, Esben Ravn Andresen, Géraud Bouwmans, Olivier Vanvincq, Hervé Rigneault
Abstract:

We report two-photon lensless imaging through a novel golden spiral Multicore Fiber. This unique layout optimizes the sidelobe levels, field of view, cross-talk, group delay and mode density to achieve a sidelobe contrast of atleast 10.9 dB. We demonstrate experimentally the ability to generate and scan a focal point with a femtosecond pulse and perform two-photon imaging.

• ##### Widefield lensless endoscopy with a Multicore Fiber
Optics letters, 2016
Co-Authors: Viktor Tsvirkun, Siddharth Sivankutty, Esben Ravn Andresen, Géraud Bouwmans, Ori Katz, Hervï¿½ Rigneault
Abstract:

We demonstrate pixelation-free real-time widefield endoscopic imaging through an aperiodic Multicore Fiber (MCF) without any distal opto-mechanical elements or proximal scanners. Exploiting the memory effect in MCFs the images in our system are directly obtained without any post-processing using a static wavefront correction obtained from a single calibration procedure. Our approach allows for video-rate 3D widefield imaging of incoherently illuminated objects with imaging speed not limited by the wavefront shaping device refresh rate.

• ##### single shot polarimetry imaging of Multicore Fiber
Optics Letters, 2016
Co-Authors: Siddharth Sivankutty, Esben Ravn Andresen, Géraud Bouwmans, Thomas G Brown, Miguel A Alonso, Hervé Rigneault
Abstract:

We report an experimental test of single-shot polarimetry applied to the problem of real-time monitoring of the output polarization states in each core within a Multicore Fiber bundle. The technique uses a stress-engineered optical element, together with an analyzer, and provides a point spread function whose shape unambiguously reveals the polarization state of a point source. We implement this technique to monitor, simultaneously and in real time, the output polarization states of up to 180 single-mode Fiber cores in both conventional and polarization-maintaining Fiber bundles. We demonstrate also that the technique can be used to fully characterize the polarization properties of each individual Fiber core, including eigen-polarization states, phase delay, and diattenuation.