Microwave Photonic Signal Generation in an Optically Injected Discrete Mode Semiconductor Laser

Round 1

Reviewer 1 Report

Authors have exerimentally demonstrated and numerically simulated microwave photonic signal generation based on period-one dynamic of optically injected discrete mode semiconductor lasers. The results are interesting. However, some problems must be solved before this manuacript is published. 

1、How did the MWP signal generate based on P1 dynamic in the optically injected DM lasers, i.e,  how to realize it in exeriment  and theory?

2.  When the injection Ratio is far more than 1 and frequency detuning is far more than 26GHz,  does the generated microwave increase linearly with the frequency detuning or optical injection ratio.

3. What is the expression of the linewidth as a function of injection ratio and feedback ratio. 

4.  How  does the linewidth affect the generated microwave?

5. In experiment,  How much is the feedback power ?

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

Dear Colleagues,

the article makes an excellent impression. A wide range of issues related to microwave photonic signal generation in an optically injected discrete mode semiconductor laser is methodically correctly stated. The range of articles devoted to the study of the used laser operation mode is quite extensive. Therefore, the version of presentation chosen by the authors, which is constantly compared with the characteristics of similar generators built on other types of lasers operating in this mode, makes the article rich in information and clearly shows the place of this work in the indicated field of research. At the same time, the authors managed not to overload the article with unnecessary information. The article is well read and written in a competent scientific language.

I would ask the authors to make one clarification. On fig. 4b and further, an inflection point appears on the graphs when the injection ratio 0.92 is reached. The authors do not explain its nature in detail, but only refer to other works where this phenomenon is described. Given the interest in the issue, I would like not to drive the reader to other articles, but to explain its nature as concisely as possible in the text of this article.

I recommend the article for publication with minimal corrections, if the authors deem it necessary to heed my request.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

Authors have been modified some issues mentioned in the orignal manuscript.  I agree that the modified manuscript is published in present form