Martin Rochette

McGill University | McGill · Department of Electrical & Computer Engineering

We present an all-fiber coherent supercontinuum spanning the spectral range of 1.7–5.0 µm from a cascade of silica, ZBLAN, and chalcogenide (ChG) nonlinear fibers (NLFs). Coherence is maintained by the combined use of femtosecond pump pulses as well as by allowing deterministic spectral broadening mechanism at every stage of the cascade. The use of...

Fiber-based wavelength converters employing soliton self-frequency shift (SSFS) are particularly attractive as tunable mid-infrared (MIR) sources due to their compact design and robust nature. Early attempts of wavelength conversion utilizing SSFS in the MIR spectral region involved cascading silica and fluoride nonlinear fibers (NLFs). In this wor...

We formulate moment equations that quantify the soliton self-frequency shift in amplifying fibers. Soliton evolution is quantified in terms of energy, chirp, duration, delay, and central frequency and as a function of fiber properties of gain, dispersion, and nonlinearity and their wavelength-dependence. Results from the moment equations agree clos...

We demonstrate the first all-fiber mid infrared ring cavity laser. This laser comprises an Er:ZBLAN fiber as a gain medium, and an optical fiber coupler made of fluoride glass for power splitting. The laser exhibits continuous-wave emission at a wavelength of 2.7-2.8 μm. The output is being compared for pumping wavelengths of 0.976 μm and 0.875 μm.

Le glissement en fréquence Raman (SSFS) est influencé par le chirp des impulsions injectées dans le milieu non-linéaire, amplificateur, et à dispersion anormale. Nous confirmons expérimentalement notre prédiction théorique qui stipule que l’amplitude du SSFS et de l’efficacité en conversion d’énergie sont maximisés pour un chirp C0 = 0.65gLD.

We report the demonstration of kW oscillating-amplifying integrated fiber laser 10 (OAIFL) lasers with Raman suppression of stimulated Raman scattering (SRS) in between the 11 oscillator and the amplifier stage. Each of the four OAIFL structures studied contains a length 12 m of ytterbium-doped fiber (YDF) in the oscillator section, and a length (4...

We demonstrate the optimal design conditions of a soliton self-frequency shift (SSFS) based wavelength converter with pulse pre-compression. Sidelobes energy of a compressed high-order soliton is partially recycled to maximize SSFS and energy conversion efficiency.

We experimentally demonstrate that in-amplifier soliton self-frequency shift and energy conversion efficiency are maximized using a pump pulse with chirp of C 0 ≈0.65g LD . This result is fundamental for optimal design of SSFS based wavelength converters.

We demonstrate the first all-fluoride mid-infrared ring cavity laser, comprising a single-mode ZBLAN optical fiber coupler and an Er: ZBLAN gain fiber. The laser exhibits continuous-wave emission at a wavelength of 2.7-2.8 μm.

We make the first demonstration of a polarization-dependent single-mode fluoride-based optical fiber coupler. The practicality of this mid-infrared compatible coupler is shown with the successful realization of an all-fiber mode-locked ring cavity laser.

We demonstrate the first proof of concept in-line polarization control using soft-glass fibers, crucial for mid-infrared applications. ZBLAN and hybrid As 2 S 3 fibers exhibit high polarization extinction ratios (PER) of 20.8 dB and 19.8 dB, respectively.

A single-mode fluoride optical fiber coupler is demonstrated with excess loss of ≤0.75 dB in the spectral range of 1500-2680 nm. Surface crystallization and associated losses are reduced by processing under an argon environment.

We present an all-fiber supercontinuum source spanning over the spectral range of 1.2-3.9 µm from an As 2 S 3 -polycarbonate hybrid microtaper. This is the broadest supercontinuum obtained from a robust polymer clad hybrid microtaper.

We present an all-fiber coherent supercontinuum spanning over the spectral range of 1.7-5.0 µm from a cascade of silica, ZBLAN, and chalcogenide nonlinear fibers. The estimated average coherence across the supercontinuum is 0.83.

A single-mode ZBLAN optical fiber coupler is demonstrated with an excess loss of 0.26 dB at a wavelength of 1550 nm and through/cross port coupling ratio of 26%/74% at a wavelength of 2730 nm. Crystallization is significantly suppressed thanks to an argon environment during tapering.

We present an efficient supercontinuum generation spanning in the wavelength range of 1.7-4.5 µm in a passive and filter-less cascade of silica, ZBLAN, and Ge10As22Se68 fibers. The supercontinuum is obtained with an energy conversion efficiency of ~17% and pulse energy of ~1.7 nJ.

We demonstrate the first all-fiber ring cavity laser operating in the mid-infrared. Utilizing a ZBLAN fiber coupler and erbium-doped fluoride fiber, the laser achieves continuous wave emission at a wavelength of 2.712 μm.

We demonstrate the first single-mode optical fiber couplers made with ZBLAN optical fiber. Couplers are fabricated using a controlled tapering procedure enabling high reproducibility while limiting glass crystallization. A coupling ratio of up to 41%/59% in cross/through ports with an excess loss of 2.5 dB is obtained at a wavelength of 2.73 μm. In...

We report a single-end forward-pumped fiber laser with a record high output power of 3 kW. The laser is assembled exclusively from commercially widespread components such as the Yb-doped fiber with core/cladding diameter of 20/400 µm, pump laser diodes at an emission wavelength of 915 nm, and a signal and pump fiber combiner that serves as the pump...

We report a single-end forward-pumped fiber laser with record high output power of 3 kW. The laser is assembled exclusively from commercially widespread components such as the Yb-doped fiber with core/cladding diameter of 20/400 µm, pump laser diodes at an emission wavelength of 915 nm, and a signal and pump fiber com-biner that serves as the pump...

We derive moment equations predicting adiabatic soliton spectral shift in a gain fiber. The resulting coupled equations provide insight and accurately quantify soliton properties without the computational resources required to solve the nonlinear Schrödinger equation.

We report a single end forward-pumped fiber laser with 3.03 kW record power. A pump recycler enhances pump absorption at 915 nm, and oscillator length is optimized to mitigate transverse mode instability.

We introduce soliton order preservation, a pumping mechanism that leads to soliton self-frequency shift with simultaneous high energy conversion efficiency (ECE) and broad tunability. We demonstrate tunable solitons over 180 nm while maintaining ECE>80%.

We present a supercontinuum spanning 1.8 µm to 3.2 µm from a passive cascade of anomalous silica fiber, anomalous ZBLAN fiber, and all-normal chalcogenide fiber taper. The resulting supercontinuum preserves coherence despite the cascaded architecture

We formulate the energy conversion efficiency from a high-order soliton to fundamental solitons by including the influence of interpulse Raman scattering in the fission process. The proposed analytical formula agrees closely with numerical results of the generalized nonlinear Schrödinger equation as well as to experimental results, while the result...

Alloys of sulphur, selenium and tellurium, often referred to as chalcogenide semiconductors offer a highly versatile, compositionally-controllable material platform for a variety of passive and active photonic applications. They are optically nonlinear, photoconductive materials with wide transmission windows that present various high- and low-inde...

We formulate the energy conversion efficiency from a high-order soliton to fundamental solitons by including the influence of interpulse Raman scattering in the fission process. The proposed analytical formula agrees closely with numerical results of the generalized nonlinear Schrodinger equation as well as to experimental results, while the result...

We demonstrate single-mode ZBLAN optical fiber couplers. A coupling ratio of 61%/39% is achieved with insertion loss of 4.3 dB at a wavelength of 2.7 µ m. Couplers are reproducible and remain stable over > 180 days.

We report a single end forward-pumped fiber laser with 3.03 kW record power. A pump recycler enhances pump absorption at 915 nm, and oscillator length is optimized to mitigate transverse mode instability.

We present a supercontinuum spanning 1.8 µm to 3.2 µm from a passive cascade of anomalous silica fiber, anomalous ZBLAN fiber, and all-normal chalcogenide fiber taper. The resulting supercontinuum preserve coherence despite the cascaded architecture.

We introduce soliton order preservation, a pumping mechanism that leads to soliton self-frequency shift with simultaneous high energy conversion efficiency (ECE) and broad tunability. We demonstrate tunable solitons over 180 nm while maintaining ECE>80%.

We derive moment equations predicting adiabatic soliton spectral shift in a gain fiber. The resulting coupled equations provide insight and accurately quantify soliton properties without the computational resources required to solve the nonlinear Schrödinger equation.

We report a simple design of Yb-doped fiber laser providing a record output power of 2kW and power conversion efficiency of 68%. The high output power of this unamplified laser oscillator is obtained thanks to the suppression of Raman emission over a spectral range of 21 nm from chirped and tilted fiber Bragg gratings inside the gain fiber of the l...

We present a reflection mode saturable absorber based on nonlinear multimode interference in a graded index multimode fiber. The saturable absorber provides a modulation depth of 12 % at a low saturation intensity of 18.5 MW/cm². The all-fiber structure and reflection mode design of this saturable absorber makes it an ideal device for the fabricati...

We present a soliton order preservation mechanism leading to broad tunability with high energy conversion efficiency (ECE) from a fiber-based soliton self-frequency shift (SSFS) system. Here, a pulse compressing fiber, placed before the Raman shifting nonlinear fiber (NLF), acts as a soliton order preserver. Thanks to this passive mechanism, the so...

Status The mid-infrared (mid-IR) spectrum of light (2-25 µm) is a topic of technological excitement and growing research activity. For instance, chemical substances exhibit vibrational and rotational absorption bands in the mid-IR, and the unique signature left by the absorption of light by these fundamental bands provides a universal means for the...

We demonstrate chalcogenide optical fiber couplers designed with a transmission spectrum response that varies with input power. The measured critical power is as low as 126 W at a wavelength of 1938 nm.

We demonstrate single-mode ZBLAN optical fiber couplers. A controlled tapering procedure leads to coupling ratios of 5%/95% and 14%/86% at a wavelength of 2200 nm, with insertion losses of 1.6 dB and 1.8 dB, respectively.

We present a reflection mode saturable absorber based on nonlinear multimode interference in a graded index multimode fiber. The saturable absorber provides a modulation depth of 12% at a low saturation intensity of 18.5 MW/cm 2. The all-fiber structure and reflection mode design of this saturable absorber makes it an ideal device for the fabricati...

p>We present a soliton order preservation mechanism leading to broad tunability with high energy conversion efficiency (ECE) from a fiber-based soliton self-frequency shift (SSFS) system. Here, a pulse compressing fiber, placed before the Raman shifting nonlinear fiber (NLF), acts as a soliton order preserver. Thanks to this passive mechanism, the...

p>We present a soliton order preservation mechanism leading to broad tunability with high energy conversion efficiency (ECE) from a fiber-based soliton self-frequency shift (SSFS) system. Here, a pulse compressing fiber, placed before the Raman shifting nonlinear fiber (NLF), acts as a soliton order preserver. Thanks to this passive mechanism, the...

We report an effective pump recycler for industrial kilowatt fiber lasers. The pump recycler is a $(6 + 1) \times 1$ ( 6 + 1 ) × 1 tapered fiber bundle, with signal ports of Ge-doped fiber (GDF) with core/cladding diameters of 20/400 µm and pump fiber ports (PFPs) with core/cladding diameters of 135/155 µm. By splicing PFPs in pairs, 77.9% of the r...

Fiber optical parametric oscillators (FOPOs) are compact optical sources of coherent and broadly tunable light compatible with operation in unconventional spectral bands. Highly nonlinear silica fibers have enabled the development of FOPOs in the telecommunication wavelength band, but the strong material absorption of silica glass at wavelengths >2...

We report a simple design of Yb-doped fiber laser providing a record output power of 2 kW and power conversion efficiency of 68%. The high output power of this unamplified laser oscillator is obtained thanks to the suppression of Raman emission over a spectral range of 21 nm from chirped and tilted fiber Bragg gratings inside the gain fiber of the...

We demonstrate the first all-chalcogenide ring fiber laser as well as the first all chalcogenide Brillouin fiber laser. The compact device is made from the combination of an As 2 Se 3 optical fiber coupler for the insertion of pump light and extraction of laser light, as well as an As 2 S 3 nonlinear gain fiber to ensure laser oscillation. Thanks t...

We report an effective pump recycler for industrial kW fiber lasers. The pump recycler is a (6 + 1) × 1 tapered fiber bundle, with signal ports of Ge-doped fibers (GDF) with core/cladding diameters of 20/400 µm and pump fiber ports (PFP) with core/cladding diameters of 135/155 µm. By splicing PFPs in pairs, 77.9% of the residual pump light reaching...

We demonstrate single-mode ZBLAN optical fiber couplers. A controlled tapering procedure leads to coupling ratios of 5%/95% and 14%/86% at a wavelength of 2200 nm, with insertion losses of 1.6 dB and 1.8 dB, respectively.

We demonstrate chalcogenide optical fiber couplers designed with a transmission spectrum response that varies with input power. The measured critical power is as low as 126 W at a wavelength of 1938 nm.

We demonstrate chalcogenide optical fiber couplers with a power-dependent coupling coefficient. The couplers are designed and fabricated using an As2Se3 fiber and characterized at a wavelength of 1938 nm, leading to a critical power of 126 W, the lowest ever reported for any optical fiber coupler. These nonlinear couplers enable all-optical switchi...

We demonstrate single-mode ZBLAN optical fiber couplers. The controlled tapering procedure leads to coupling ratios of 5%/95% and 14%/86% at a wavelength of 2.2 µm, with insertion losses of 1.6 dB and 1.8 dB, respectively.

A three-stage soliton self-frequency shift system composed of silica, ZBLAN, and microstructured As2S3 fiber is presented. From pumping at 1.94 µm, Raman soliton is shifted successively to 2.20 µm, 2.40 µm, and 3.12 µm.

We demonstrate a thulium-doped fiber laser that is mode-locked thanks to nonlinear polarization rotation (NPR) in a chalcogenide tapered fiber. The high nonlinearity of the tapered fiber leads to a combined reduction in mode-locking threshold power and cavity length compared to any all-silica NPR based mode-locked lasers. In the continuous wave mod...

We demonstrate a Thulium-doped fiber laser that is mode-locked thanks to nonlinear polarization rotation (NPR) in a chalcogenide tapered fiber. The high nonlinearity of the tapered fiber leads to a combined reduction in mode-locking threshold power and cavity length compared to any all-silica NPR based mode-locked lasers. In the continuous wave mod...

We demonstrate chalcogenide optical fiber couplers designed with a transmission spectrum response that depends on the input power. The measured switching power is as low as 126 W at a wavelength of 1938 nm.

We study the impact of inserting a chirped and tilted fiber Bragg grating in between variable lengths of oscillator and amplifier stage of a high-power fiber laser, reaching up to 2 kW in output power.

We present a simple and efficient design of wavelength converter tunable in the wavelength range of 2.10-2.65 µm. Raman solitons at 1.94 µm are frequency shifted in a fluoride fiber with conversion efficiency of 53%-91%.

We report two fiber optical parametric oscillators (FOPO) built entirely out of chalcogenide and fluoride fibers. The FOPOs show Raman assisted and pure parametric oscillation with tunable Stokes emission within 2.023-2.048 µm and 2.088-2.139 µm.

We demonstrate a Thulium-doped fiber laser that is Q-switched mode-locked via nonlinear polarization rotation in an As2S3 taper. The laser allows single and multiwavelength pulses, tunable central wavelength and tunable multiwavelength separation.

We experimentally and numerically evaluate the energy distribution of fundamental solitons following a high-order soliton fission process. Under certain conditions, this evaluation significantly diverges from the prediction led by the inverse scattering method.

We present a reflection mode saturable absorber based on nonlinear multimode interference in a graded index multimode fiber. The saturable absorber provides a modulation depth of 12% at a low saturation intensity of 18.5 MW/cm². The all-fiber structure and reflection mode design of this saturable absorber makes it an ideal device for the...

We present a reflection mode saturable absorber based on nonlinear multimode interference in a graded index multimode fiber. The saturable absorber provides a modulation depth of 12% at a low saturation intensity of 18.5 MW/cm². The all-fiber structure and reflection mode design of this saturable absorber makes it an ideal device for the...

Optical fibers are advantageously used for the delivery and the processing of light in optical systems due to their robust guiding mechanism, their immunity to electromagnetic interference as well as their small form factor and low weight. Applications that require fibers capable of guiding light from high power lasers in the mid-infrared (mid-IR),...

We study the impact of inserting a chirped and tilted fiber B ragg grating in between variable lengths of oscillator and amplifier stage of a high-power fiber laser, reaching up to 2 kW in output power.

We experimentally and numerically evaluate the energy distribution of fundamental solitons following a high-order soliton fission process. Under certain conditions, this evaluation significantly diverges from the prediction led by the inverse scattering method.

We demonstrate chalcogenide optical fiber couplers designed with a transmission spectrum response that depends on the input power. The measured switching power is as low as 126 W at a wavelength of 1938 nm .

We present a simple and efficient design of wavelength converter tunable in the wavelength range of 2.10-2.65 μm. Raman solitons at 1.94 μm are frequency shifted in a fluoride fiber with conversion efficiency of 53%-91%.

We predict analytically the energy conversion efficiency from the fission of a high-order soliton into fundamental solitons. Taking inter-pulse Raman gain into account, this prediction adds precision to the inverse scattering method prediction.

We report a 78% cladding pump recycler based on a tapered fiber bundle. The conversion efficiency of a 2.2 kW Yb-doped fiber laser is improved by the pump recycler from 66.7% to 73.0%.

A three-stage soliton self-frequency shift system composed of silica, ZBLAN, and microstructured AS2S3 fiber is presented. From pumping at 1.94 µm, Raman soliton is shifted successively to 2.20 µm, 2.40 µm, and 3.12 µm.

We demonstrate single-mode ZBLAN optical fiber couplers. The controlled tapering procedure leads to coupling ratios of 5%/95% and 14%/86% at a wavelength of 2.2 µ m, with insertion losses of 1.6 dB and 1.8 dB, respectively.

Tapered optical fibers (TOF) and tapered optical couplers (TOC) are compact optical devices with diverse and complementary functionalities yet sharing their origin from similar tapering setups. On one hand, TOFs offer exceptionally high nonlinearity and adjustable chromatic dispersion, a perfect blend for optical processing functions such as superc...

Emerging applications in the mid-infrared (MIR) stimulate the growth and development of novel optical light sources. Soliton self-frequency shift (SSFS) in soft glass fiber currently shows great potential as an efficient approach toward the generation of broadly tunable femtosecond pulses in the MIR. In this work, we demonstrate a highly efficient...

Emerging applications in the mid-infrared (MIR) stimulate the growth and development of novel optical light sources. Soliton self-frequency shift (SSFS) in soft glass fiber currently show great potential as an efficient approach towards the generation of broadly tunable femtosecond pulses in the MIR. In this work, we demonstrate highly efficient tu...

The polarization-maintaining performance of the traditional Panda-type polarization-maintaining fiber (PMF) coil is significantly affected by winding stress and temperature. Here, we present an elliptical core Panda-type PMF coil based on a fiber that employs both geometric and stress birefringence. The extinction ratio of the elliptical core PMF c...