MSSI System Combined with Dispersion-Managed Link Configured with Random-Based RDPS Differently Controlled by Fiber Length
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsThis study explores a novel approach using random-based residual dispersion per span (RDPS) and 'random-inverse’ configuration to effectively tackle the challenges posed by chromatic dispersion and fiber nonlinearity in wavelength division multiplexed (WDM) signals. Through numerical simulations, the authors demonstrate how the proposed dispersion map enhances signal compensation, outperforming 'non-random fixed' methods.
Line “223” In equation (1), the author shows the importance of the nonlinear coefficient, how do you plan to address the challenges posed by nonlinear effects in high-power transmission scenarios?
Line “278” Does the compensation of amplitude and phase components for the distorted WDM signal depend on the random array RDPS and the specific method used to create it, resulting in performance differences between the actual arrangement of the "random inverse" configuration? Furthermore, is the configuration of the first half not fully random?
Line “284” Figure 2. The simulation results show that the varied DMF length gives better low jitter but relatively large EOP. Can authors explain why low jitter can result in a larger EOP?
Line “295” In most cases, a randomly generated scheme is better than “non-random fixed” scheme. But there are still some worst cases. Is there any other method besides the numerical simulation to identify the best and worst cases from the random pattern?
Line “335” the Author mentioned the advantage of the 'random-inverse' over 'non-random fixed' dispersion map. But there is no direct comparison between two methods. Can author add additional info or cite some of their previous results regarding the comparison?
Author Response
Thank you for your valuable and meaningful review comments. We have summarized our responses to the reviewers' comments in the attached cover letter, so please confirm the attached document.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsThe article presents the dispersion map configured by random-based residual dispersion per span (RDPS) applied into the mid-span spectral inversion (MSSI) system to mitigate the impact of chromatic dispersion and fiber nonlinearity in wavelength division multiplexed (WDM)
signals. More specifically, the article confirms that the method of randomly determining the RDPSs by varying the length of the dispersion compensation fibers improves system performance more than the variation of the length of single-mode fibers. This is the main novelty of the presented work.
The content of the article is within the scope of the Journal.
The literature does provide the necessary background for the article’s case (in particular ref. [15] which forms the basis for the presented work).
Simulation results (figs 2-6) confirm the article’s argument (the superiority of varying the length of the dispersion compensation fibers against varying the length of the standard single-mode fibers).
Optional: The authors could add a comment (possibly, after line 150) regarding the attenuation in each SSMF span. More specifically, they could make a reference of the fact that keeping the span attenuation at about 16 dB allows for a large number of successive amplifications (30, in this case) without the need of regeneration.
Use of English
Regarding the use of English, a moderate editing would be sufficient.
Review decision
I consider the article publishable subject to a moderate editing regarding the use of English.
Comments on the Quality of English LanguageRegarding the use of English, a moderate editing would be sufficient.
Author Response
Thank you for your valuable and meaningful review comments. We have summarized our responses to the reviewers' comments in the attached cover letter, so please confirm the attached document.
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for AuthorsChung and Lee have investigated the effect of the factor of the factor of determining RDPS on the compensation for the distorted WDM signals by numerical example. The topic is very interesting. The paper corresponds to basic topics of Applied Sciences. But, the discussions are needed concerning possible applications of results in optical communications. The following questions should be considered before it can be accepted for publication.
1. Equation (2) should be rewritten.
2. How the eye diagrams affected by random number? Why is random number 24 and 39 set? Please explain.
3. When the intensity changes, how is the signal affected by the nonlinear Kerr effect?
4. In practice, can the numerical results be applied? Please explain it.
Comments on the Quality of English LanguageMinor editing of English language required.
Author Response
Thank you for your valuable and meaningful review comments. We have summarized our responses to the reviewers' comments in the attached cover letter, so please confirm the attached document.
Author Response File: Author Response.pdf
