1. ABOUT THE DATASET
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Title: Dataset associated with: 'Free-space Optical Communications at 4 Gbit/s Data Rate with a Terahertz Laser'

Creator(s): Jayaprasath Elumalai [1], Mohammed Salih [1], Martyn Fice [2], Adam Brown [1], Lianhe Li [1], Edmund H. Linfield [1], Alexander Valavanis [1], Alwyn J. Seeds [2], A. Giles Davies [1] and Joshua R. Freeman [1]

Organisation(s): 1. University of Leeds 2. University College London

Rights-holder(s): Copyright 2025 University of Leeds

Publication Year: 2025

Description: Dataset from figures in paper and supplementary information 'Free-space Optical Communications at 4 Gbit/s Data Rate with a Terahertz Laser'.

Cite as: Elumalai, Jayaprasath and Salih, Mohammed and Fice, Martyn and Brown, Adam and Li, Lianhe and Linfield,, Edmund H. and Valavanis, Alexander and Seeds, Alwyn J. and Davies, A Giles and Freeman Joshua R. (2025) Dataset for 'Free-space Optical Communications at 4 Gbit/s Data Rate with a Terahertz Laser'. University of Leeds. https://doi.org/10.5518/1754.

Contact: j.elumalai@leeds.ac.uk, j.r.freeman@leeds.ac.uk


2. TERMS OF USE
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Copyright 2025 University of Leeds.

This dataset is licensed under a Creative Commons Attribution 4.0 International Licence: https://creativecommons.org/licenses/by/4.0/.


3. PROJECT AND FUNDING INFORMATION
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Funding organisation: UKRI
Grant no.: EP/W028921/1
Grant no.: MR/S016929/1
Grant no.: MR/Y011775/1


4. CONTENTS
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Files are comma delimited '*.dat' files containing data from figures in the paper and supplementary information.

Paper
	Figure 3a.dat		    - Spectrogram of THz QCL as a function of drive current
	Figure 3b.dat		    - CW LIV of the QCL
	Figure 3c.dat		    - Optical response of the full system
	Figure 4a-b.dat		    - Transmitted and received signals of NRZ-OOK of 1 Gbit/s
	Figure 4c.dat		    - Power spectrum of the received signal of NRZ-OOK of 1 Gbit/s and noise floor
	Figure 5.dat		    - BER as a function of received optical power for different bit rates
	Figure 6a-b.dat		    - Transmitted and received signals of PAM-4 of 2 Gbit/s
	Figure 6c.dat		    - Power spectrum of the received signal of PAM-4 of 2 Gbit/s
	
Supplementary Info
	Figure S2.dat		    - QCL modes' IF peak power and THz power attenuation over the frequency
	Figure S3.dat		    - Noise power spectral density of the receiver
	Figure S4.dat		    - Measured reflection coefficient (S11) at of the QCL side bias-tee
	Figure S5a-b.dat	    - BER maps in {QCL current and Modulation power}
	Figure S6(i)a-b.dat	    - Transmitted and received signals of NRZ-OOK of 2 Gbit/s
	Figure S6(i)c.dat	    - Power spectrum of the received signal of NRZ-OOK of 2 Gbit/s and noise floor
	Figure S6(ii)a-b.dat    - Transmitted and received signals of NRZ-OOK of 3 Gbit/s
	Figure S6(ii)c.dat	    - Power spectrum of the received signal of NRZ-OOK of 3 Gbit/s and noise floor
	Figure S6(iii)a-b.dat   - Transmitted and received signals of NRZ-OOK of 4 Gbit/s
	Figure S6(iii)c.dat	    - Power spectrum of the received signal of NRZ-OOK of 4 Gbit/s and noise floor


5. METHODS
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- Raw data acquired from high-speed oscilloscope and high-bandwidth spectrum analyser
- Raw data processed using codes written in MATLAB