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Papers by Nicolas Godbout

Research paper thumbnail of All-fiber depolarizer

Research paper thumbnail of Tunable erbium doped fiber laser using a silicon micro-electro-mechanical Fabry-Perot cavity

2007 Ieee/leos International Conference on Optical Mems and Nanophotonics, 2007

Research paper thumbnail of Determination du coefficient de gain Raman de fibres de silice dopees au phosphore

Research paper thumbnail of OPTICAL COMMUNICATION-Periodic power oscillations from combined effect of polarisation-dependent loss and polarisation evolution in recirculating loops

Research paper thumbnail of Reply to comment on

Research paper thumbnail of Tapered fiber diameter measurements

Research paper thumbnail of All-fiber depolarizer

Research paper thumbnail of All-fiber few-mode OCT using a photonic lantern (Conference Presentation)

Research paper thumbnail of Raman-based cw supercontinuum generation in a fiber ring laser with low-output coupling

Fiber Lasers and Glass Photonics: Materials through Applications, 2018

We demonstrate a new technique to generate a continuous-wave supercontinuum based on the stimulat... more We demonstrate a new technique to generate a continuous-wave supercontinuum based on the stimulated Raman effect in an Yb-based ring laser configuration. Continuously pumping this ring cavity with a maximum of 19W optical power, we were able to excite up to 6 Stokes orders and achieved wavelengths up to 1600nm. Due to the feedback mechanism of the ring cavity the generated spectrum does not exhibit plain and separated stokes peaks but the fundamental Raman nature of the spectrum is altered additional nonlinear effects. This results in a dense coverage and an almost complete excitation of the wavelength range from the laser wavelength to the highest stokes wavelength and hence in a continuous-wave supercontinuum. Since the main mechanism of broadening is the Raman effect, we do not rely on anomalous dispersion and modulation instability as typically required to seed continuous wave supercontinuum generation.

Research paper thumbnail of All-fiber few-mode optical coherence tomography using a modally-specific photonic lantern

Biomedical Optics Express, 2021

Optical coherence tomography (OCT) was recently performed using a few-mode (FM) fiber to increase... more Optical coherence tomography (OCT) was recently performed using a few-mode (FM) fiber to increase contrast or improve resolution using a sequential time-domain demultiplexing scheme isolating the different interferometric signals of the mode-coupled backscattered light. Here, we present an all-fiber FM-OCT system based on a parallel modal demultiplexing scheme exploiting a novel modally-specific photonic lantern (MSPL). The MSPL allows for maximal fringe visibility for each fiber propagation mode in an all-fiber assembly which provides the robustness required for clinical applications. The custom-built MSPL was designed for OCT at 930 nm and is wavelength-independent over the broad OCT spectrum. We further present a comprehensive coupling model for the interpretation of FM-OCT images using the first two propagation modes of a few-mode fiber, validate its predictions, and demonstrate the technique using in vitro microbead phantoms and ex vivo biological samples.

Research paper thumbnail of High-efficiency, double-clad fiber coupler, cladding mode sensor using a tilted fiber Bragg grating

2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching (OECC/PS), 2013

A high-efficiency sensor for reflected cladding modes generated by a tilted fiber Bragg grating (... more A high-efficiency sensor for reflected cladding modes generated by a tilted fiber Bragg grating (TFBG) is demonstrated using a double-clad fiber (DCF) coupler (DCFC). The specially designed DCFC is spliced to a reflective TFBG written into photosensitive single mode fiber, tapered to match the inner cladding diameter of the DCFC. The DCFC is made by tapering and fusing two double-clad fibers (DCF) together. The device is capable of capturing low and high order backward propagating cladding modes to allow each mode to be clearly discriminated. A new mode of operation for refractive index sensing of a surrounding medium is possible with this sensor.

Research paper thumbnail of Fabrication and characterization of all-fiber 120-degree optical hybrids (Conference Presentation)

Research paper thumbnail of A Fair Loss-Tolerant Quantum Coin Flipping Protocol

AIP Conference Proceedings, 2009

Coin flipping is a cryptographic primitive in which two spatially separated players, who in princ... more Coin flipping is a cryptographic primitive in which two spatially separated players, who in principle do not trust each other, wish to agree on a random bit. Classical and quantum coin flipping protocols have been studied extensively for more than twenty-five years. However, until recently, quantum coin flipping protocols were designed without taking into consideration the losses of quantum information

Research paper thumbnail of Double-clad fiber coupler for confocal endomicroscopy at 800 nm

We report the development of a novel double-clad fiber coupler (DCFC) specifically designed for n... more We report the development of a novel double-clad fiber coupler (DCFC) specifically designed for near infrared confocal microscopy, confocal endomicroscopy and fluorescence imaging. The custom designed double-clad fiber (DCF) supports the propagation of a single mode (cutoff wavelength 610nm) in its 4 micron-diameter core (0.12 NA), while allowing as many as 150 modes in its 25 micron-diameter inner cladding (0.19 NA). The inner-cladding-to-mode-field-diameter ratio of ~6 allows for reduction in speckle contrast, while preserving the optical sectioning of confocal imaging. A DCFC is obtained using a standard fusion tapering technique and allows for achromatic (from 750 nm to 850 nm) transmission through the core (>90%) and achromatic extraction of >70% of inner cladding multimodal signal. The all-fiber coupler is inserted in a spectrally encoded confocal microscopy system using a simple splice with the laser’s SMF750 fiber having similar mode-field-diameter and NA. The laser is...

Research paper thumbnail of Propagating Pulses in Optical Fibers Using Second Order Moments

Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 2007

ABSTRACT Approximate yet efficient formulae describing the second order moments of a pulse propag... more ABSTRACT Approximate yet efficient formulae describing the second order moments of a pulse propagating in a nonlinear dispersive optical fiber over many dispersion and nonlinear lengths are presented. Examples in the normal dispersion regime are given.

Research paper thumbnail of Nonlinear Stabilization of Modes with an Orbital Momentum in Optical Fibers

Nonlinear Guided Waves and Their Applications, 2005

ABSTRACT

Research paper thumbnail of Two-fold symmetric geometries for tailored phase-matching in birefringent solid-core air-silica microstructured fibers

Optics express, Jan 10, 2010

The effect of birefringence in 2-fold-symmetric microstructured optical fibers on the phase match... more The effect of birefringence in 2-fold-symmetric microstructured optical fibers on the phase matching conditions for four-wave mixing is analyzed. The three general types of four-wave mixing are considered. General features are obtained through analytic expansions of phase-matching formulas. Three commonly used designs of fibers are analyzed numerically. Particular designs allow the generation of specified wavelengths, supercontinuum or entangled photons.

Research paper thumbnail of Atomic Quantum Metrology with Polarization-Entangled States of Light

Research in Optical Sciences, 2012

ABSTRACT We report on the first use of quantum entanglement to improve non-destructive measuremen... more ABSTRACT We report on the first use of quantum entanglement to improve non-destructive measurement of a delicate system: We use narrowband NOON states to break the standard quantum limit in an optical magnetometer.

Research paper thumbnail of Wavelength independent fused fibre couplers based on group velocity equalisation

2006 European Conference on Optical Communications, 2006

A new scheme to obtain wavelength-insensitive optical fibre couplers, based on group velocity equ... more A new scheme to obtain wavelength-insensitive optical fibre couplers, based on group velocity equalisation, is presented. It allows flattened wavelength response over the whole C-band.

Research paper thumbnail of Règles de design de lasers Raman tout-fibre en cascades

Research paper thumbnail of All-fiber depolarizer

Research paper thumbnail of Tunable erbium doped fiber laser using a silicon micro-electro-mechanical Fabry-Perot cavity

2007 Ieee/leos International Conference on Optical Mems and Nanophotonics, 2007

Research paper thumbnail of Determination du coefficient de gain Raman de fibres de silice dopees au phosphore

Research paper thumbnail of OPTICAL COMMUNICATION-Periodic power oscillations from combined effect of polarisation-dependent loss and polarisation evolution in recirculating loops

Research paper thumbnail of Reply to comment on

Research paper thumbnail of Tapered fiber diameter measurements

Research paper thumbnail of All-fiber depolarizer

Research paper thumbnail of All-fiber few-mode OCT using a photonic lantern (Conference Presentation)

Research paper thumbnail of Raman-based cw supercontinuum generation in a fiber ring laser with low-output coupling

Fiber Lasers and Glass Photonics: Materials through Applications, 2018

We demonstrate a new technique to generate a continuous-wave supercontinuum based on the stimulat... more We demonstrate a new technique to generate a continuous-wave supercontinuum based on the stimulated Raman effect in an Yb-based ring laser configuration. Continuously pumping this ring cavity with a maximum of 19W optical power, we were able to excite up to 6 Stokes orders and achieved wavelengths up to 1600nm. Due to the feedback mechanism of the ring cavity the generated spectrum does not exhibit plain and separated stokes peaks but the fundamental Raman nature of the spectrum is altered additional nonlinear effects. This results in a dense coverage and an almost complete excitation of the wavelength range from the laser wavelength to the highest stokes wavelength and hence in a continuous-wave supercontinuum. Since the main mechanism of broadening is the Raman effect, we do not rely on anomalous dispersion and modulation instability as typically required to seed continuous wave supercontinuum generation.

Research paper thumbnail of All-fiber few-mode optical coherence tomography using a modally-specific photonic lantern

Biomedical Optics Express, 2021

Optical coherence tomography (OCT) was recently performed using a few-mode (FM) fiber to increase... more Optical coherence tomography (OCT) was recently performed using a few-mode (FM) fiber to increase contrast or improve resolution using a sequential time-domain demultiplexing scheme isolating the different interferometric signals of the mode-coupled backscattered light. Here, we present an all-fiber FM-OCT system based on a parallel modal demultiplexing scheme exploiting a novel modally-specific photonic lantern (MSPL). The MSPL allows for maximal fringe visibility for each fiber propagation mode in an all-fiber assembly which provides the robustness required for clinical applications. The custom-built MSPL was designed for OCT at 930 nm and is wavelength-independent over the broad OCT spectrum. We further present a comprehensive coupling model for the interpretation of FM-OCT images using the first two propagation modes of a few-mode fiber, validate its predictions, and demonstrate the technique using in vitro microbead phantoms and ex vivo biological samples.

Research paper thumbnail of High-efficiency, double-clad fiber coupler, cladding mode sensor using a tilted fiber Bragg grating

2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching (OECC/PS), 2013

A high-efficiency sensor for reflected cladding modes generated by a tilted fiber Bragg grating (... more A high-efficiency sensor for reflected cladding modes generated by a tilted fiber Bragg grating (TFBG) is demonstrated using a double-clad fiber (DCF) coupler (DCFC). The specially designed DCFC is spliced to a reflective TFBG written into photosensitive single mode fiber, tapered to match the inner cladding diameter of the DCFC. The DCFC is made by tapering and fusing two double-clad fibers (DCF) together. The device is capable of capturing low and high order backward propagating cladding modes to allow each mode to be clearly discriminated. A new mode of operation for refractive index sensing of a surrounding medium is possible with this sensor.

Research paper thumbnail of Fabrication and characterization of all-fiber 120-degree optical hybrids (Conference Presentation)

Research paper thumbnail of A Fair Loss-Tolerant Quantum Coin Flipping Protocol

AIP Conference Proceedings, 2009

Coin flipping is a cryptographic primitive in which two spatially separated players, who in princ... more Coin flipping is a cryptographic primitive in which two spatially separated players, who in principle do not trust each other, wish to agree on a random bit. Classical and quantum coin flipping protocols have been studied extensively for more than twenty-five years. However, until recently, quantum coin flipping protocols were designed without taking into consideration the losses of quantum information

Research paper thumbnail of Double-clad fiber coupler for confocal endomicroscopy at 800 nm

We report the development of a novel double-clad fiber coupler (DCFC) specifically designed for n... more We report the development of a novel double-clad fiber coupler (DCFC) specifically designed for near infrared confocal microscopy, confocal endomicroscopy and fluorescence imaging. The custom designed double-clad fiber (DCF) supports the propagation of a single mode (cutoff wavelength 610nm) in its 4 micron-diameter core (0.12 NA), while allowing as many as 150 modes in its 25 micron-diameter inner cladding (0.19 NA). The inner-cladding-to-mode-field-diameter ratio of ~6 allows for reduction in speckle contrast, while preserving the optical sectioning of confocal imaging. A DCFC is obtained using a standard fusion tapering technique and allows for achromatic (from 750 nm to 850 nm) transmission through the core (>90%) and achromatic extraction of >70% of inner cladding multimodal signal. The all-fiber coupler is inserted in a spectrally encoded confocal microscopy system using a simple splice with the laser’s SMF750 fiber having similar mode-field-diameter and NA. The laser is...

Research paper thumbnail of Propagating Pulses in Optical Fibers Using Second Order Moments

Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, 2007

ABSTRACT Approximate yet efficient formulae describing the second order moments of a pulse propag... more ABSTRACT Approximate yet efficient formulae describing the second order moments of a pulse propagating in a nonlinear dispersive optical fiber over many dispersion and nonlinear lengths are presented. Examples in the normal dispersion regime are given.

Research paper thumbnail of Nonlinear Stabilization of Modes with an Orbital Momentum in Optical Fibers

Nonlinear Guided Waves and Their Applications, 2005

ABSTRACT

Research paper thumbnail of Two-fold symmetric geometries for tailored phase-matching in birefringent solid-core air-silica microstructured fibers

Optics express, Jan 10, 2010

The effect of birefringence in 2-fold-symmetric microstructured optical fibers on the phase match... more The effect of birefringence in 2-fold-symmetric microstructured optical fibers on the phase matching conditions for four-wave mixing is analyzed. The three general types of four-wave mixing are considered. General features are obtained through analytic expansions of phase-matching formulas. Three commonly used designs of fibers are analyzed numerically. Particular designs allow the generation of specified wavelengths, supercontinuum or entangled photons.

Research paper thumbnail of Atomic Quantum Metrology with Polarization-Entangled States of Light

Research in Optical Sciences, 2012

ABSTRACT We report on the first use of quantum entanglement to improve non-destructive measuremen... more ABSTRACT We report on the first use of quantum entanglement to improve non-destructive measurement of a delicate system: We use narrowband NOON states to break the standard quantum limit in an optical magnetometer.

Research paper thumbnail of Wavelength independent fused fibre couplers based on group velocity equalisation

2006 European Conference on Optical Communications, 2006

A new scheme to obtain wavelength-insensitive optical fibre couplers, based on group velocity equ... more A new scheme to obtain wavelength-insensitive optical fibre couplers, based on group velocity equalisation, is presented. It allows flattened wavelength response over the whole C-band.

Research paper thumbnail of Règles de design de lasers Raman tout-fibre en cascades