An Enhanced Method for Dynamic Characterization of High-Power LEDs for Visible Light Communication Applications

Round 1

Reviewer 1 Report

In this paper, the authors propose an alternative method for determining the electrical equivalent of LEDs subject to high current variations at very high frequency, in the MHz range, i.e., in an operating range for VLC applications. The paper is technically sound with an interesting idea.  The paper presentation must be improved starting from the badly written abstract to the conclusion and future work. Authors should highlight the novelty and contributions clearly in the abstract and the introduction section. Related studies must be analyzed and compared in a separate section while the research motivations must be addressed clearly in the Introduction section. The paper organization is not reader-friendly and it is difficult to identify the adopted methods that should be described clearly. Section 2 is too brief and it is not clear if it belongs to the conventional methods or is utilized in the proposed method. Better to explain the proposed method in comparison with the conventional method and then compare the obtained results from both methods in the results and discussion section. The analysis of each method individually makes it difficult to understand the benefits and merits of the proposed method. Authors should emphasize the novelty of the proposed method and its validation compared with the conventional methods. All notations and abbreviations must be defined after each equation and a table for all will be helpful. The way of describing figures is not consistent and not in a correct sequence, authors jump from one figure to other figures randomly which makes it confusing (For example, talk about Fig. 10 then return to Fig. 3 as in the last paragraph Page 8). Also many similar inconsistent descriptions in other sections, each figure must be cited in the text near to the figure.     

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

The authors have investigated the estimation of the electrical equivalent and analyzed the electrical behaviour of LEDs subject to high current variations at very high frequency, in the MHz range. The work has also been compared with traditional methods for characterizing the equivalent circuit of the LEDs. Results and discussions are interesting and helpful for visible light communication systems. This paper can be published in Electronics, provided following issues can be addressed.

1. Some abbreviations should be clarified when they appear for the first time.
2. Add a Conclusion section.
3. Specify parameters used in the considered components in a table.
4. The font size in Figure 5 has to be increased.
5. Add some discussion regarding the bandwidth of the LED on the proposed method.
6. Supplement discussions on the state of the art of other optical wireless communication systems.

See e.g.

Z. Chowdhury et al., Optical wireless hybrid networks: trends, opportunities, challenges, and research directions, IEEE Communications Surveys & Tutorials, 2020.

W Hu et al., High-dimensional feature based non-coherent detection for multi-intensity modulated ultraviolet communications, IEEE Journal of Lightwave Technology, 2021.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

The authors have addressed the Reviewer's concerns.