Advanced Various Fault Detection Scheme for Long-Reach Mode Division Multiplexing Transmission

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

This paper presents a method using multi-mode transmission reflection analysis for analyzing various fault types in long-reach FMF links. The presented work has great potential for the practical implementations in the FMF fault detection. I recommend to accepted this manuscript for publication in Photonics if the following issues are addressed.

(1) How to measure the crosstalk of the photonic lanterns and the mode coupling of FMF?

(2) The proposed technique seems to detect and localize just a single fault in the link. Is there a way to manage multiple events?

(3) The return loss at the fault point is treated as constant regardless of the order of the LP mode of the probe signal, but the reason is unclear.

(4) The detection sensitivity of weak Rayleigh backscattering with a CW light should be discussed.

(5) The formats of references are not unified.

Comments on the Quality of English Language

The English Language of the paper is OK.

Author Response

Dear Reviewer,

I hope this message finds you well. I am writing to express my sincere gratitude for the positive outcome of the peer review process for our manuscript titled "Advanced Various Fault Detection Method for Few Mode Fiber Links Based on Multi-Mode Transmission Reflection Analysis". I am delighted to learn that the reviewers have found our work to be suitable for publication in Photonics.  

I would also like to extend my appreciation to the reviewers for their insightful comments and constructive feedback, which have greatly helped to enhance the quality and clarity of our research. Please see the attachment.

Please let me know if there are any further steps we need to take or any additional information you require from us to move forward with the publication process.

Thank you once again for the opportunity to contribute to Photonics. I am looking forward to the final publication of our work.

                                                    

Best regards,

Feng Liu

Wenzhou University

[email protected]

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

Dear Authors, thank you for your work. It is interesting and showed some new schemes and methods for me. 

Few suggestions from my side:

1. Phi-OTDR is not related for fault detection in fiber line. While TRA method can have some references to previous works.

2. In my understanding - in Eq.2 in second brackets instead of passing through MUX and DEMUX you have double pass through MUX.

3. In table 4 I guess Dynamyc range values are switched for OTDR and MM-TRA.

4. Very interesting will be to look at real tests of such method (e.g. is 0.001 powermeter error real?). But your work already is quite big.

Author Response

Dear Reviewer,

I hope this message finds you well. I am writing to express my sincere gratitude for the positive outcome of the peer review process for our manuscript titled "Advanced Various Fault Detection Method for Few Mode Fiber Links Based on Multi-Mode Transmission Reflection Analysis". I am delighted to learn that the reviewers have found our work to be suitable for publication in Photonics.  

I would also like to extend my appreciation to the reviewers for their insightful comments and constructive feedback, which have greatly helped to enhance the quality and clarity of our research. Please see the attachment.

Please let me know if there are any further steps we need to take or any additional information you require from us to move forward with the publication process.

Thank you once again for the opportunity to contribute to Photonics. I am looking forward to the final publication of our work.

                                                      

 

Best regards,

Feng Liu

Wenzhou University

[email protected]

Author Response File: Author Response.pdf