READ ME File For 'Dataset for: Optimization and visualization of phase modulation with filtered and amplified maximal - length sequence for SBS suppression in a short fiber system: A theoretical treatment' Dataset DOI: 10.5258/SOTON/D1795 ReadMe Author: Yutong Feng, University of Southampton orcid.org/0000-0002-6839-2106 [OPTIONAL add ORCID ID] This dataset supports the publication: AUTHORS: Yifeng Yang,Binglin Li,Meizhong Liu,Xuchen Huang,Yutong Feng,Dan Cheng,Bing He,Jun Zhou,Johan Nilsson TITLE: Optimization and visualization of phase modulation with filtered and amplified maximal-length sequence for SBS suppression in a short fiber system: A theoretical treatment JOURNAL: Optics Express PAPER DOI IF KNOWN: https://doi.org/10.1364/OE.426070 This dataset contains: The figures are as follows: Fig. 2 (a) SBS reflectivity of unmodulated signal plotted as a function of the single-pass gain G (Np). (b) The ON-OFF-ON MLS phase modulation and the SBS dynamic for G = 30 Np and 150 Np. (c) The temporal evolution of SBS reflectivity for different single-pass gain G. (d) The time constant of the exponential growth of the Stokes wave as a function of G. Fig. 3 Normalized MLS-based phase sequences according to Eq. (5) in one period for MLS5, MLS7, MLS9, and MLS11 with 6.5 GHz clock rate. (a) Unfiltered MLS, one dot represents one bit, that is T = 0.1538 ns in our case. (b) MLS filtered by zero-phase low-pass filter with the amplitude response of a 6th-order Butterworth filter with a cutoff frequency of 2.2 GHz. (c) Enlargement over the longest run in a single period (TN) of MLS9 and MLS11. (d) The corresponding sections for the longest runs in filtered MLS9 and MLS11. Fig. 4 (a) The length of the longest uninterrupted sub-sequence (or dwell time) nT vs. clock rate and (b) the period NT vs. clock rate for different patterns. Fig. 5 An example calculation of the ACF for MLS3 phase modulated optical field. Fig. 6 PACF of the MLS phase modulated optical field, normalized by E¯L. Fig. 7 Intensity of (a) the carrier and (b) the adjacent sideband components vs. kp for n = 5, 7, 9, and 11. (c) Intensity of the carrier and the strongest sideband components around kp = π for different n. (d) Values of kp that lead to the same intensity in the carrier and the adjacent components for different power n. Fig. 8 Optical spectra for MLS phase modulation with n = 5, 7, 9, 11, and fcr = 6.5 GHz for kp equal to (a) π, (b) 1.12π, (c) 1.3π, and (d) 2π. Note the different vertical scales in (c) and (d). Fig. 9 Optical spectra as phase modulated by filtered and amplified MLS waveform with fcr = 6.5 GHz, fco/fcr = 0.4, and n = 3, 5, 7, 9, 11, and 13 for kσ equal to (a) 0.5π, (b) π, (c) 1.2π, and (d) 1.5π. Fig. 10 Normalized SBS threshold with unfiltered MLS and kp = π vs. clock rate for (a) n = 3, 5, 7, 9, 11, and 17 for clock rates from 0 GHz to 10 GHz, and (b) n = 7 for clock rates from 0 GHz to 30 GHz. Fig. 11 The normalized SBS suppression of MLS9 vs. clock rate for (a) different fco/fcr and (b) different kσ (fco/fcr = 0.4). (c) kσ/kp vs. fco/fcr with fcr = 10 GHz for different n (kp = π). Fig. 12 The normalized SBS suppression vs. fco/fcr and kσ for MLS9 takes values of -π/2 or π/2. (b) The RMS linewidth vs. fco/fcr and kσ. (c) The ratio of normalized SBS threshold to RMS linewidth vs. fco/fcr and kσ. Five local maxima are marked in red circle. Fig. 13 Power spectra of optical signal as phase modulated by filtered and amplified MLS waveform with fco/fcr and kσ taking values of (a) fco/fcr = 0.15, kσ = 2.6π (local maximum 1), (b) fco/fcr = 0.22, kσ = 2π (local maximum 2), (c) fco/fcr = 0.23, kσ = 1.4π (local maximum 3), (d) fco/fcr = 0.35, kσ = 0.93π (local maximum 4), and (d) fco/fcr = 0.54, kσ = 0.56π (local maximum 5). fcr = 10 GHz. Fig. 14 Normalized SBS threshold vs. fco/fcr and kσ (or kRMS) for (a) MLS3, (b) MLS5, (c) MLS7, (d) MLS9, and (e) MLS11 with 6.5 GHz clock rate. (f) The normalized SBS threshold vs. kσ for different patterns (fco/fcr = 0.4). Fig. 15 Normalized SBS threshold vs. fco/fcr and kσ for MLS9 with fcr equal to (a) 1 GHz, (b) 3 GHz, (c) 4 GHz, (d) 5 GHz, (e) 6.5 GHz, and (f) 10 GHz. Fig. 16 RMS linewidth (blue circles) of the optical spectra and normalized SBS threshold (red circles) plotted as a function of the clock rate, MLS9, fco/fcr = 0.54, kσ = 0.56π. Date of data collection: 2020 Information about geographic location of data collection: Licence: open Related projects: Youth Innovation Promotion Association of the Chinese Academy of Sciences (2020252); National Key Research and Development Program of China (2018YFB0504500); National Natural Science Foundation of China (61705243, 61735007, 61805261); Special Project for Research and Development in Key areas of Guangdong Province (2018B090904001); Air Force Office of Scientific Research (FA9550-17-1-0007). Date that the file was created: May, 2021