Mode Suppression in Injection Locked Multi-Mode and Single-Mode Lasers for Optical Demultiplexing
, Maryam Shayesteh 1,2, William Cotter 1, Alison H. Perrott 1,2, Mohamad Dernaika 2,3 and Frank H. Peters 1,2Round 1
Reviewer 1 Report
Review for “Mode Suppression in Injection Locked Multi-Mode and Single Mode Lasers for Optical Demultiplexing,” by Shortiss, Shayesteh, William Cotter, Dernaika, and Peters.
This paper demonstrates injection locking by an optical frequency comb of a slotted Fabry-Perot laser. The author fabricate a comb demultiplexor based on the slotted lasers , show injection locking to an externally injected comb source. The authors use a multi-mode rate equation approach to replicate the experimental behaviour, especially when the Fabry-Perot laser becomes single mode due to stable injection locking. The authors use their theory to suggest optimal designs of lasers for such purposes as comb demultiplexors using injection locking by evaluating the Q-factor of the laser cavity.
The paper is well written and the results are clearly presented. One aspect that could be clearer is that a wideband continuous spectrum for the simulations are presented in Figs 4,5 and 7. Are the authors stitching the output of the multi-mode rate equations together (and then convolving with a Voigt-function) to create the wideband spectra?
Author Response
Please see the attached .pdf letter.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
This paper presents an experimental/theoretical study of side mode suppression in injection locked FP lasers in both cases of single frequency and optical comb injection. Their simple model could provide the theoretical expectations on the injected wavelength/temperature sweeps which are similar with the experimental results. The suggested model describes SMSR and the optical properties of the injection locked FP laser very well, therefore, I think the paper can give simple guidelines to design the injection locked FP lasers. I recommend this paper can be published if some discrepancies between model and the experimental ones.
In table.1, the parameters used in calculations are presented. Please comment on how the values are determined.
In Fig. 4 and 5, experimental graphs are well matched to the calculated ones. However, there are still some discrepancies such as (1) Fig.4, each horizontal line in (a) has some thickness variation in contrast to that each horizontal line in (b) has constant thickness. (2) Fig. 5, (b) has separate vertical box region with constant horizontal width near temperature 20.8, indicated by flat lines. However, in (a), the width of the separate box region near 20.8 changes with increasing wavelength. Authors should comment on what factors, not included in model, can make such discrepancies.
In conclusion, authors should mention the limitations of the proposed model.
Author Response
Please see the attached .pdf file.
Author Response File: Author Response.pdf
