-The topic of this paper is a hot topic, and there are in literature many recent good works about the methods to solve the routing and spectrum assignment problem. -The abstract well written, and contains well-defined aims and tasks of the research, but it is too long 273 words. Also, nothing has been mentioned about if they used the optical nodes with or without the spectrum conversion. -The title is informative and relevant. - Regarding the references, there are some references relevant, recent, and referenced correctly, but most of the references are old and outdated. Also, some references are not referenced correctly like 19 and 21. - The Introduction section is clear and well written to show what is already known about this topic, the authors have established the current knowledge in the field, also, the authors do clearly stated the gap in the research which they are looking to fill by their work. Also, this section has a good reflection of the aims that have been mentioned in the abstract of this paper. -You only need to define the abbreviations at the first mention, then used it directly. So, you can't use the abbreviation before the definition (Example: “RRTS"). -The literature survey on relevant or similar works is missing. A sporadic and short survey of some fields of the problem has been presented, and a mention to orient the reader about the fields of the problem by going to specific references for more reading. It is recommended to collect the previous works to be in one section. -The methodology of the paper is clear as a method, and the steps of the implementation of this method are clear, sequentially, and in a gradual to complete the steps to reach the results. The variables have been defined and measured appropriately, and the study methods are valid and reliable with enough detail to replicate the work with other topologies. -I also want to ask about why the authors didn't use more than two topologies? Also, what are the criteria that the authors adopted in choosing these two topologies only!! ". Besides, the authors did not care to mention what software tools were used in achieving these steps. - The results are not sufficient for this work, because the proposed algorithm in this work needs to be compared with the other methods used by the related works to show if there is an actual improvement by using the proposed method to solve the routing and spectrum assignment problem in optical networks. - In section 4, the authors mention that "We assume that all traffic will use QPSK modulation", but they didn't mention the reason!! Or why using only this modulation method? -The results and measurements are clear, and the data presented in an appropriate way by tables and figures which are relevant and clearly presented too. Also, the text in the results has added an explanation to the data. -The section of the discussion is clear and deals clearly with the results that have been obtained. -Regarding the section of the conclusions, I recommend rewriting it to show the effectiveness of the proposed method and also showing its performance compared to other methods used to solve this problem that this work addresses. The conclusion section is weak, hasn't supported by references or results, and lacks direction of interpretation and creative critical thinking, does not show the actual effect of achieving the aims set for the research, and does not clearly show the ability of the proposed method compared to other methods related to solving the same problem in optical networks.