Impact of Geometric Input Fibers’ Core Positioning on the Adiabaticity of Photonic Lanterns
Round 1
Reviewer 1 Report
Comments and Suggestions for Authors
1. Page 2, Line 48 аnd further along the text.: «...we first...». I think it's better to stick to an impersonal style in scientific articles (exclude «we»).
2. Page 2, Line 72: «we define» – It is unnecessary phrase.
3. Page 2, Line 68, Line 78 and Figures 2 and 3a: It is said, that "claddings in pink color", but at Fig. 2 it is orange. Please, bring the figures and text to one color scheme.
4. Figure 4: It is better to clarify term «adiabatic requirement» (is the same as left part of equation 2 ?)
5. Page5, Line 162: The abbreviations IL and MDL must be transcribed.
Author Response
Thanks for reviewer's suggestion. Modifications have been made, following are the list of modifications.
1. Page 2, Line 48 аnd further along the text.: «...we first...». I think it's better to stick to an impersonal style in scientific articles (exclude «we»).
Answer: corrected
2. Page 2, Line 72: «we define» – It is unnecessary phrase.
Answer: corrected
3. Page 2, Line 68, Line 78 and Figures 2 and 3a: It is said, that "claddings in pink color", but at Fig. 2 it is orange. Please, bring the figures and text to one color scheme.
Answer: corrected
4. Figure 4: It is better to clarify term «adiabatic requirement» (is the same as left part of equation 2 ?)
Answer: Yes, it is the left part of equation 2. We added "Figure. 4(a) shows the adiabatic requirement LP01- LP11 at r/R ranges from 0.3 to 0.075, which is calculated from Equation. 2 (left side)." for the clarification
5. Page5, Line 162: The abbreviations IL and MDL must be transcribed.
Answer: Corrected
Reviewer 2 Report
Comments and Suggestions for AuthorsThank you for putting an effort to make optical communication better and more efficient, however, the level of novelty presented in the manuscript is somehow limited. I would like to know if the the equations 1) and 2) are sole ideas proposed by the authors or based on previous research. This has to be clear and properly referenced. Some Figures: 1) and 2) are not really informative and can be removed, espesially when the same logic is presented in Fig. 3a. You should also state what step was used to calculate Fig. 4 -I see its 0.05 but it needs to be clearly stated in the text. Conclusions needs to be improved as well.
I hope these comments will be usefull. I wish you success!
Comments on the Quality of English Language
Authors present great introduction, however, to make further reading clear, majority of the manuscript needs to be rewritten. Please try to avoid repeating the same phrases over and over. I know sometimes it's not possible to find a substitution for technical terms, but some more effort needs to be put prior the publication.
To name few:
line 111: typo corrections
line 117-120: rephrase it please ("need")
line 149-161: whole section shall be revised
line 167: needs English editing
Author Response
Thanks for reviewer's suggestion. Modifications have been made, following are the list of modifications.
1. I would like to know if the the equations 1) and 2) are sole ideas proposed by the authors or based on previous research. This has to be clear and properly referenced.
Answer: corrected, reference has been added
2. Some Figures: 1) and 2) are not really informative and can be removed, espesially when the same logic is presented in Fig. 3a.
Answer: Figure .1 is used to show the schematics of photonic lantern. Figure. 2 shows the geometric facet of photonic lantern by conventional method. Figure 3 a is the facet of photonic lantern by our proposed method for better performance. We clarify this by modifying the illustration of figure.2 "The geometric facet of 3-mode (a) and 6-mode (b) photonic lantern by conventional method".
3. You should also state what step was used to calculate Fig. 4 -I see its 0.05 but it needs to be clearly stated in the text.
Answer: We added "Figure. 4(a) shows the adiabatic requirement LP01- LP11 at r/R ranges from 0.3 to 0.075, which is calculated from Equation. 2 (left side)." for the clarification
4. Conclusions needs to be improved as well.
Answer: The discussion section has been rewritten "We explore the impact geometric input fiber positionings on the adiabatic requirement of 3-mode photonic lantern and demonstrate the optimal structure to further improve the adiabaticity. Our results could apply to photonic lantern with large number of modes. Making high-quality photonic lantern with large number of modes is hard at the current stage, since ways to alleviate adiabatic requirement are exhaustive. Our method provides a new dimension for the alleviation of adiabatic requirement of photonic lantern."
5. Comments on the Quality of English Language
Answer: corrected
Reviewer 3 Report
Comments and Suggestions for AuthorsGeneral comments:
The presented paper is devoted to issues related to improving the method of design a photonic lantern by assembling it from several stacked fibers in hollow low-index outer cladding that then creates a taper. The authors presented the state-of-the-art in this area in a very synthetic manner. The reviewer believes that the article will be successfully published with a few minor extensions.
Detailed comments:
The work has been written concisely, but requires a few extensions and clarifications:
1. What wavelength of light was used to perform the research?! Were the tests performed for different wavelengths?
2. Please, in addition to the description at the beginning of Section 3, present the refractive index profile graphically, in the cross-section of the entire structure at both ends of the taper, which will clearly illustrate the geometric and profile changes.
3. How were the calculations or simulations performed? What tools were used for this purpose?
4. Before the fundamental mode acquires the shape shown in Figure 3(c), it must propagate in the fiber. What assumptions have been made in this context?
5. Was any part of the experiment physical or were all results obtained by simulation (calculations)?
6. In Figure 3(a), please label the LP11 modes as a and b.
7. In Figure 4, there are charts in different colors with a legend that is not described in the content of the paper or in the caption after the block of drawings.
Author Response
Thanks for reviewer's suggestion. Modifications have been made, following are the list of modifications.
1. What wavelength of light was used to perform the research?! Were the tests performed for different wavelengths?
Answer: Photonic lantern is known as a photonic device with broadband wavelength covering C and L band. To clarify this point, we modify in the Introduction part "Photonic lantern is a broadband photonic device that maps fundamental modes into ordered modes in multimode waveguide ".
2. Please, in addition to the description at the beginning of Section 3, present the refractive index profile graphically, in the cross-section of the entire structure at both ends of the taper, which will clearly illustrate the geometric and profile changes.
Answer: corrected in Figure 3 (a)
3. How were the calculations or simulations performed? What tools were used for this purpose?
Answer: The method is called Beam Propagation Method (BPM) which we have specified in our paper.
4. Before the fundamental mode acquires the shape shown in Figure 3(c), it must propagate in the fiber. What assumptions have been made in this context?
Answer: The process of mode evolution has to be adiabatic, other than that, no particular assumptions have been made.
5. Was any part of the experiment physical or were all results obtained by simulation (calculations)?
Answer: Thanks for your question, current research is all simulations.
6. In Figure 3(a), please label the LP11 modes as a and b.
Answer : We modified Figure 3(a), thanks for your suggestion.
7. In Figure 4, there are charts in different colors with a legend that is not described in the content of the paper or in the caption after the block of drawings.
Answer: Corrected. The legend is r/R.
