Personne : Jafari, Omid
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Jafari
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Omid
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Université Laval. Faculté des sciences et de génie
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ncf11921344
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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 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 Transmission of 120 Gbaud QAM with an all-silicon segmented modulator(Institute of Electrical and Electronics Engineers, 2022-06-08) Mohammadi, Abdolkhalegh; Jafari, Omid; Sepehrian, Hassan; Zheng, Zibo; Zhang, Xiaoguang; Shi, Wei; Rusch, LeslieSegmenting a silicon modulator can substantially increase its electro-optic bandwidth without sacrificing modulation efficiency. We demonstrate a segmented silicon IQ modulator and experimentally explore both modulator design and operating point to optimize systems trade-offs in coherent detection. An electro–optic bandwidth of greater than 40 GHz is measured for a 4-mm-long segment, and greater than 60 GHz for a 2-mmlong segment. We evaluate optical transmission experimentally at 120 Gbaud for 16-ary quadrature amplitude modulation (QAM) and 32QAM. The segments are operated in tandem with identical data at each segment. We present an experimental method to align data timing between the segments. Through the optimization of segment biasing and linear compensation, we have achieved a bit error rate (BER) of 16QAM well below the 20% forward error correction (FEC) threshold (2 × 10−2 ). Adding nonlinear pre-compensation allows for 32QAM with a BER below the 24% FEC threshold (4.5 × 10−2 ), enabling a net rate of 483 Gbs per polarization. The modulator can also be operated as an optical digital analogy converter for complex optical signal generation, for which 100 Gbs is achieved for a proof of concept.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