Personne : LaRochelle, Sophie
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LaRochelle
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Sophie
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Université Laval. Département de génie électrique et de génie informatique
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ncf10263799
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Publication Accès libre Tunable slow-light in silicon photonics subwavelength grating waveguides(IEEE, 2019-12-09) Jean, Philippe; Gervais, Antoine; LaRochelle, Sophie; Shi, WeiSlow-light is experimentally demonstrated in subwavelength grating waveguides integrated on a silicon photonic chip. At the band-edge, a group index up to 30 is measured. We show that the band-edge wavelength varies linearly with the subwavelength grating period and can be shifted by thermal tuning.Publication Accès libre Silicon photonic modulator loaded by NPN junctions(Institute of electrical and electronics engineers, 2020-08-17) Jafari, Omid; LaRochelle, Sophie; Shi, WeiWe experimentally demonstrate an asymmetric Bragg grating modulator with a phase shifter length of 240 μm, loaded by p-n junctions. The mode conversion by the asymmetric sidewall grating allows us to operate a Bragg modulator in reflection without a circulator. Simulation results show that there is room for improving the modulator efficiency and footprint by exploiting NPN junctions instead of p-n junctions.Publication Accès libre Analysis of inter-core cross-gain modulation in cladding pumped multi-core fiber amplifiers(IEEE Xplore, 2018-11-15) Essiambre, René-Jean.; Chen, Haoshuo; Matte-Breton, Charles; Fontaine, Nicolas K.; LaRochelle, Sophie; Ryf, Roland; Messaddeq, YounèsWe numerically investigate pump-induced gain variations in eight-core fi ber amplifi ers. We compare two fi bers with different erbium profi les by varying input power from -25 dBm to 0 dBm in one or four cores. Inter-core cross-gain modulation is < 0.6 dB.Publication Accès libre Silicon photonic modulator based on coupled Bragg grating resonators used as phase shifters(Optical Society of America, 2018-03-11) Jafari, Omid; Sepehrian, Hassan; LaRochelle, Sophie; Shi, WeiBragg gratings with phase-shifts are inserted in a Mach-Zehnder modulator to enhance phase modulation, reduce device length and improve efficiency (Vπ×L=0.28 Vcm). Simulations show 3 nm optical bandwidth corresponding to 50 K operating temperature range.Publication Accès libre Silicon photonic modulator using mode conversion with asymmetric sidewall bragg gratings(IEEE, 2018-10-04) Jafari, Omid; LaRochelle, Sophie; Shi, WeiAn asymmetric sidewall grating allows to operate a Bragg modulator in reflection without circulator and with less than 1.5 dB on-chip loss. An asymmetric Y-branch directs the incident TE0 mode to the grating, while the reflected TE1 mode is guided to the drop port.Publication Accès libre A model for electro-optic response of lumped slow-light silicon photonic modulators(IEEE, 2020-11-16) Jafari, Omid; LaRochelle, Sophie; Shi, WeiWe model the electro-optic bandwidth of lumped slow-light modulators. In agreement with experiments, the model shows that modulators speed is determined by the RC constant and the interaction time in the slow light Brag structure.Publication Restreint Mode-conversion-based silicon photonic modulator using asymmetric Bragg grating and Y-branch(2019-09-22) Lin, Jiachuan; Jafari, Omid; LaRochelle, Sophie; Shi, WeiWe experimentally demonstrate a Bragg-grating-based modulator operating in reflection with low loss and without a circulator by using mode conversion and an asymmetric Y-branch. With a compact footprint of 240μm, we demonstrate OOK up to 30 Gbit/s with an estimated switching energy of 150 fJ/bit.Publication Accès libre Silicon photonic modulator using coupled bragg grating resonators in a Mach-Zehnder structure(Optical Society of America, 2019) Jafari, Omid; LaRochelle, Sophie; Shi, WeiWe demonstrate a silicon modulator enhanced by Bragg-grating resonators. The compact modulator (130- µm phase shifters) with Vπ×L= 0.25 V.cm has a 32-GHz EO bandwidth consuming only 80 fJ/bit at 10 Gbit/s