eprintid: 1443006 rev_number: 31 eprint_status: archive userid: 608 dir: disk0/01/44/30/06 datestamp: 2014-08-24 18:33:24 lastmod: 2024-06-18 10:44:18 status_changed: 2015-12-08 16:32:49 type: article metadata_visibility: show item_issues_count: 0 creators_name: Lavdas, S creators_name: Zhao, S creators_name: Panoiu, NC creators_name: Driscoll, JB creators_name: Grote, RR creators_name: Osgood, RM title: Wavelength conversion and parametric amplification of optical pulses via quasi-phase-matched four-wave mixing in long-period Bragg silicon waveguides ispublished: pub divisions: UCL divisions: A01 divisions: B04 divisions: C05 divisions: F46 keywords: Wavelength conversion devices; Nonlinear optical devices; Waveguides, channeled; Nonlinear optics, four-wave mixing; (190.4975) Parametric processes; Nonlinear optics, integrated optics. note: This version is the author-accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. abstract: We present a theoretical analysis supported by comprehensive numerical simulations of quasi-phase-matched fourwave mixing (FWM) of ultrashort optical pulses that propagate in weakly width-modulated silicon photonic nanowire gratings. Our study reveals that, by properly designing the optical waveguide such that the interacting pulses copropagate with the same group velocity, a conversion efficiency enhancement of more than 15 dB, as compared to a uniform waveguide, can readily be achieved. We also analyze the dependence of the conversion efficiency and FWM gain on the pulse width, time delay, walk-off parameter, and grating modulation depth. © 2014 Optical Society of America. date: 2014-07-01 official_url: https://doi.org/10.1364/OL.39.004017 vfaculties: VENG oa_status: green full_text_type: other primo: open primo_central: open_green verified: verified_manual elements_source: Scopus elements_id: 949420 doi: 10.1364/OL.39.004017 lyricists_name: Panoiu, Nicolae-Coriolan lyricists_id: NPANO59 full_text_status: public publication: Optics Letters volume: 39 number: 13 pagerange: 4017 - 4020 issn: 0146-9592 citation: Lavdas, S; Zhao, S; Panoiu, NC; Driscoll, JB; Grote, RR; Osgood, RM; (2014) Wavelength conversion and parametric amplification of optical pulses via quasi-phase-matched four-wave mixing in long-period Bragg silicon waveguides. Optics Letters , 39 (13) 4017 - 4020. 10.1364/OL.39.004017 <https://doi.org/10.1364/OL.39.004017>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1443006/1/Panoiu_1405.7434v1.pdf