Demonstration of a Duplex Microwave Photonic Filter and Its Reconfigurability in a Frequency Range of 0–10 GHz
Round 1
Reviewer 1 Report
- In-Line 122-133, you have discussed the center frequency generated from simulation and calculation, which are 7.02 GHz and 6.95 GHz respectively. I think it is well-matched to the simulation result. At the same time, you need to show the other parameters such as insertion and return loss for both the simulation and the formulated one. If you have all these parameters then only we can do an accurate comparison between the two results.
- Figure 7 and Figure 8 are measurement data from simulation and RF spectrum. We can observe differences between stop bands in both the diagram. If you see the electrical power at the lower passband, in the measured diagram, it is around -10dBm but it is not the same case with the simulation data.
- The measure data generated for the seven different passbands represented in figure 10. By comparing the figure 9 and figure 10. There are certain thing that is not clearly stated.
- a) Passband center frequency power keeps on changing when we move to a higher frequency. At the same time stopband, power also keeps changing and goes on decreasing (with only value).
b) If you see figure 10, the center frequency of passband is somehow matching, but the other parameter such as stop band power is not with the simulation result.
c) For passband frequency f7, the measured data looks deteriorate.
Author Response
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Author Response.pdf
Reviewer 2 Report
Authors,
Please see the attached file.
Thanks.
Comments for author File: Comments.pdf
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
Review of the manuscript "Demonstration of a Duplex Microwave Photonics Filter and its Reconfigurability in a Frequency Range of 0-10 GHz"
The authors report about the application of a special modulation technology of a diode laser operating at the telecom frequency of 1550 nm. This modulated spectrum is fed in a Mach Zehnder type modulator. At the end of a transmission line the simulated and eventually measured at least six pass bands of the optical signal converted to an electrical signal. These distinct pass bands could act as transmission channels on a communication line.
The modulation of the diode laser itself was discussed in an earlier paper. In this manuscript this feature was used in modulator and transmission scheme. The comparison between theoretical calculation, simulation and experiment seems convincing.
I have just minor questions/comments about the manuscript:
(1) abstract: The abbreviations "SM-SF" and "MPF" should be additional introduced in the abstract. At least when the abstract is used later without giving the full text, this help the reader to understand the content.
(2) The authors state, that the "intermodal separation" of the diode laser was changed. However, the data of figure 5 shows a modulation of the mode scheme with an additional (larger) spacing. Moreover, a "real" change of the diode laser mode distance would require to tune/change the optical cavity length of the diode laser itself (by external cavity, temperature, carrier concentration, multiple cavity lasers etc.). Maybe it could be less confusing to call this an additional modulation of the diode laser mode.
(3) Line 128: It's maybe better to say "[...] described in Ref. [7] [...]"
(4) The model of the used OSA should be given, to rule out the possible question if the analysis of the signal is confused by measurement artifacts caused by a technical limitations of the OSA.
Author Response
Please see the Word file attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
The questions have been addressed. The paper can be accepted.
