Functionalized Chiral Twisted Optical Fibers: A Review
Round 1
Reviewer 1 Report
Zhang et al submitted their review work to the Photonics journal entitled – “Functionalized Chiral Twisted Optical Fibers: A Review”. This review work focused on the development of chiral optical fibers and their applications in diverse fields. Although the authors covered a wide range of published literature in their review work, however, the objectives of this work and the prospects and limitations of this technology were not clearly described in the submitted manuscript. This work needs to be revised seriously before publication.
I would suggest going through the following comments that should be addressed before the final publication.
1. The review paper should not only focus on the summary of the recent work and applications. It should also contain the future aspect of this technology. Thus, I would suggest adding the key challenges of this field and a rigorous explanation of some potential research directions in Section 4. The authors only mentioned the following:
“Currently, the exploration of chiral twisted fibers is still in its early stages. In the near future, these applications may be realized and applied in real-life engineering.”
2. The background of this work is not clear to me. It requires a clear and concise explanation of why this study is important with proper References. In the “Introduction”, the first paragraph needs more explanation as a background with appropriate references.
3. I am not convinced by the following statement in the “Introduction” part. The authors should clearly state all three parts: Challenges, prospects, and opportunities.
“In the last section of this review, we present the challenges, prospects, and promising opportunities of the future functional chiral fiber for functionalized devices.”
4. Typos in line 63, ---- “refractive indices”, “mth”. Please check the text throughout the manuscript for typos and English.
5. Line -57, HLPGs should be in brackets. WGMs are not defined in the manuscript.
6. In Section 2, adding a section “Fabrication process of twisted optical fiber and challenges” would be good. - which helps the reader to identify the available fabrication techniques in the literature. The authors put a section “3.1 Fabrication of Chiral Twisted Fiber” later, where they only described the fabrication part with focusing the challenges.
7. In the caption of Fig. 1, (a) and (b) should be stated clearly.
8. I would suggest authors add a table of the summary for Twisted optical fiber, where they could include the fiber structure, material, fabrication techniques, challenges, applications, significant results, and so on. This will help the general reader to follow the technological improvements in the published literature.
9. The references of all the figures should be cited in the manuscript if taken from a source.
10. It would be good to add a classification table/chart/tree for Section “3.3. Chiral Twisted Microstructured optical fibers” for the general reader. In addition, the publication year in the chart will surely help to understand and follow the gradual development of this fiber technology.
11. It may be good a “characterization” subsection for Chiral Twisted Microstructured optical fibers to give a general idea about the process and required instrumentation for the characterization process.
12. The caption in Fig. 12 should reflect the actual scenario. Please add (a) and (b) for two parts.
Overall, the authors cited a lot of publications in the submitted manuscript, which is good for the reader, however, they need to maintain a consistent story and focus on the above-mentioned three parts: Challenges, prospects, and opportunities.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
1-Along the introduction, the authors do not use the term chiral as associated with the twisted fibers.
2- Before equation 1, the authors can add LPG, as mentioned in the text, close to references 2 and 3 (in the text).
3- Figure 4 is difficult to understand because it is difficult to read.
4- The authors used two formats for the references in the text: Numbers and Names with numbers.
5- The caption of Figure 5 does not mention the result. What result ( I think is the transmission more profound point)
6- On page 8, first paragraph, the authors do not write what AOM is.
7-The paper has a broad content related to twisted optical fibers and applications with relevant references set.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The authors have made substantial changes to address the comments that I made. This version looks good to me.
