SOA-MZI Differential Transformation Approach Applied on Simultaneous Electro-Optical Mixing

Round 1

Reviewer 1 Report

Review of "SOA–MZI Differential Transformation Approach Applied on Simultaneous Electro-Optical Mixing" by Termos and Mansour

 

This paper concerns the electro optic mixing of baseband signals to RF frequencies about 60 GHz using an SOA. The authors directly  modulate the SOA using an optical pulse source with repetition frequency of 58 GHz that has detected on  a high speed photodiode. The authors then pass a baseband modulated optical wave the SOA and the information is then upscaled to 58 GHz via the SOA current modulation.

The paper is interesting, well written, and should be published provided the following points are addressed:

 

The SOAs in an interfermetric configuration do seem to offer much higher modulation bandwidths than a single SOA, it would be beneficial to give a brief explanation why in the paper.

The symbol for LNAs in Fig. 2  has the pointy side of the triangle going into the photodiode, should the direction not be into the SOA?

 

The X-axes in the RF spectra in Fig 3 and Fig 9 should be properly numerated instead of centre and span.

 

 

 

 

Author Response

Kindly, find attached, the response of the first reviewer.

Author Response File: Author Response.docx

Reviewer 2 Report

The author presented good work in SOA–MZI Differential Transformation Approach Applied on 2 Simultaneous Electro-Optical Mixing. The results are satisfactory

Author Response

Kindly, find attached, the response of the first reviewer.

Author Response File: Author Response.docx

Reviewer 3 Report

In this paper, a simultaneous electro-optical mixing system based on SOA-MZI differential transformation simultaneous is designed, and the simulation results of important optical and electrical indicators are presented. However, the paper still lacks some necessary simulation results, and the text description is too cumbersome. Therefore, the author needs to address the following issues before publication:

1.      The proposed scheme is very similar to the author's previous research work [47]. Please explain the difference between the two papers.

2.      Where is the differential modulation reflected in Figure 1?

3.      The author claims to use VPI simulation software for testing, so "Experimental Setup" should be changed to "Simulation Setup". Similarly, all relevant descriptions in the text need to be revised.

4.      The spectrum shown in Figure 3 has a high noise level, please explain the reason.

5.      Why are the wavelength intervals and optical power of the four IF data signals different?

6.      What is the bandwidth of each IF OFDM-128QAM signal?

7.      In practice, PDs with a bandwidth of 300GHz and a responsivity of 0.85A/W are very rare. If the author knows about related products, please explain.

8.      Please explain why the channel with 1540 nm wavelength has the highest output light power in Fig. 4 and Table 1. In addition, it is recommended to supplement the relevant spectra. Moreover, Tables 1 and Figure 5 essentially reflect the same information, and the authors should simplify it.

9.      The authors need to explain the necessity of testing the power stability of the system in a simulated environment.

10.  Without correlative spectrogram evidence, the author's statement "Its output optical power is 30 dBm while its noise power is −52 dBm." is not convincing. Therefore, whether the OSNR can reach 82dB remains to be verified.

11.  According to the spectrum shown in Figure 9, the proposed mixing system has a lot of spurs, how does the author consider this problem?

Author Response

Kindly, find attached, the response of the third reviewer.

Author Response File: Author Response.pdf

Round 2

Reviewer 3 Report

The manuscript has been carefully revised and can be considered for publication.