Find the Frequency Spectrum of an optical communication link

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Homework Statement



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2. Homework Equations

10 Log[10](g/mW)= GdBw

The Attempt at a Solution


I have attached a document of my approach to this question. I would like to know if my approach is correct? Thank you for your assistance
 

Attachments

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I have completed the question in the attached word document, and I was looking for confirmation as to whether my approach was correct. Unfortunately I was not given the answer to this question from my professor, that is why I am looking to solve it through this forum.