Tailorable Brillouin Light Scattering in a Lithium Niobate Waveguide
, Gong Wang 1,2, Kai Li 1,2, Changyu Song 1,2, Zhiyong Wang 1,2, Sensen Li 3, Yulei Wang 1,2, Zhiwei Lu 1,2, Yuhai Li 3, Tongyu Liu 3 and Xiusheng Yan 3Round 1
Reviewer 1 Report
See attached pdf.
Comments for author File: 
Comments.pdf
Author Response
Thank you very much for your suggestion. We have modified your suggestion point-to-point. And submit it as an attachment. At the same time, in response to the English problems in the article, we have found a special organization to polish the article.
Author Response File: Author Response.pdf
Reviewer 2 Report
Simulations of forwarded SBS in lithium niobate waveguides is novel and will be of interest this community. Lasing in this system is a good topic to consider. The paragraph "Therefore in this paper, we fabricate..." This is misleading as the work is numerical and did not involve fabrication. This paragraph should include mention of the specific lithium niobate platfrom and jey results, particularly relating to lasing which is in the title of the paper. But lasing isn't really explore in this paper which is confusing given that "laser" is in the title. I suggest remove lasing from the title.
If the submission is going to be placed in the context of SBS laser on-chip then it should cite the first demonstration: Irina V. Kabakova et al., "Narrow linewidth Brillouin laser based on chalcogenide photonic chip," Opt. Lett. 38, 3208-3211 (2013)
The reader wants to understand more intuitively why the design in Figure 2 is used, as it's the same as used by Van Laer et al. and is fragile. In the case of silicon is it designed in this way to inhibit the leaking of the acoustic mode in to the substrate because the speed of sound in silicon is higher than in silica, hence the acoustic mode is leaky. What is the case for lithium niobate on silica? Is the suspended geometry even necessary? Or is this specifically use to allow for Forward Brillouin and why is forward more interesting than traditional backward Brillouin. More discussion and explanation is needed. There is good background in this paper that should be cited: Christopher G. Poulton et al, "Acoustic confinement and stimulated Brillouin scattering in integrated optical waveguides," J. Opt. Soc. Am. B 30, 2657-2664 (2013)
The English needs to be improved, for example I don't know what the last sentence in the paper means:
"At the same time, this waveguide system has better integra-284 tion, using photon-phonon conversion, in order to avoid the traditional way of radio wave propagation, opened up a new way."
The introductory paragraph has bad grammar and poor expression. Please break the first paragraph.
Ref[2] and Ref [17] are the same.
Author Response
Thank you very much for your suggestion. We have modified your suggestion point-to-point. And submit it as an attachment. At the same time, in response to the English problems in the article, we have found a special organization to polish the article.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The manuscript is better now. Fig. 5b is still of low quality and barely readable. Maybe try to change the color scale as we do not see the red dashed lines very well and the color scale range is mainly blue so adapting the range might help. The formatting of the reference list is still inconsistent (name formatting mainly).
Author Response
Thank you very much for your suggestion. In response to your question, we have turned the red dashed line in Fig. 5b into a dotted star line and made it bold. At the same time, we made further improvements to refer to the problems in the literature.
Reviewer 2 Report
The authors have revised the submission and have addressed my concerns.
Author Response
Thank you very much for your recognition of my article.
