1. ABOUT THE DATASET
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Title: Dataset associated with: '14 Gb/s 32-QAM OFDM Free-Space Communication Using a Directly Modulated Terahertz Laser'

Creator(s): Jayaprasath Elumalai [1], Connor Kidd [1], Adam Brown [1], James Seddon [2], Martyn Fice [2], Lianhe Li [1], Edmund H. Linfield [1], Alexander Valavanis [1], Sanchit S. Kondawar [2], 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 2026 University of Leeds

Publication Year: 2026

Description: Dataset from figures in the paper and supplementary information '14 Gb/s 32-QAM OFDM Free-Space Communication Using a Directly Modulated Terahertz Laser'.

Cite as: Elumalai, Jayaprasath et al 	. (2026) Dataset for '14 Gb/s 32-QAM OFDM Free-Space Communication Using a Directly Modulated Terahertz Laser'. University of Leeds. https://doi.org/10.5518/1949.

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


2. TERMS OF USE
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Copyright 2026 University of Leeds.

This dataset is licensed under a Creative Commons Attribution 4.0 International License: 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
	Fig. 2b.dat		- CW LIV of the 3rd DFB QCL.
	Fig. 2d.dat		- Optical response of the complete link.
	Fig. 3a.dat		- Electrical spectrum of 32-QAM OFDM.
	Fig. 3b.dat		- Aggregate BER versus ROP for 16-QAM and 32-QAM OFDM at fixed modulation power.
	Fig. 3c.dat		- Aggregate BER versus RF modulation power for 16-QAM and 32-QAM OFDM at fixed ROP.
	Fig. 4(a1).dat		- BER versus subcarrier frequency for 16-QAM OFDM. 
	Fig. 4(b1).dat		- BER versus subcarrier frequency for 32-QAM OFDM.
	Fig. 5a.dat		- Payload net bit rate versus RF modulation power for 16-QAM and 32-QAM OFDM.
	Fig. 5b.dat		- Payload net bit rate versus ROP at fixed 15 dBm modulation power.
	Fig. 6a.dat		- Electrical spectrum for 32-QAM OFDM, with the first four low-frequency subcarriers unloaded in the transmitter DSP.
	Fig. 6b.dat		- Aggregate BER and payload net bit rate versus modulation power.
	Fig. 6c.dat		- Tone-resolved BER at 15 dBm modulation power. 
	
Supplementary Info
	Figure S2.dat		- Atmospheric attenuation spectrum at the measured QCL emission frequencies.
	Figure S3a.dat		- Aggregate EVM versus ROP for 16-QAM and 32-QAM OFDM at fixed modulation power.
	Figure S3b.dat		- Aggregate EVM versus RF modulation power for 16-QAM and 32-QAM OFDM at fixed ROP.
	Figure S4a.dat		- BER versus subcarrier frequency for 16-QAM OFDM.
	Figure S5a.dat		- Aggregate BER versus RF modulation power for 64-QAM OFDM.
	Figure S5b.dat		- Tone-resolved BER showing strongly impaired subcarriers across the occupied band.
	Figure S5c.dat		- Recovered electrical spectrum of 64-QAM OFDM.
	

5. METHODS
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- Raw data acquired from a high-speed oscilloscope.
- Raw data processed using code written in MATLAB