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Exam Instructions: Answer the questions below on the provided answer sheet. Follow the instructions below the exam questions to submit your work to Gradescope. Examity must remain running until you finish submitting your work.  Problem 1 (20 points) Briefly describe wavelength division multiplexing (WDM). You can use a drawing or schematic to explain the concepts/steps involved.  Problem 2 (10 points)  How is WDM related to FDM (frequency division multiplexing)? Problem 3 (10 points) Mention 2 desired features of tunable optical filters for WDM applications. Problem 4 (10 points) Give 2 examples of tunable optical filters for WDM applications. Problem 5 (10 points) What does an optical cross-connect do? Problem 6 (10 points) What is an advantage of SONET (Synchronous Optical Network) over OTN (Optical Transport Network)? Problem 7 (10 points)  What is the primary working principle of CDM (Code Division Multiplexing)? Problem 8 (10 points) What is the primary working principle of TDM (Time Division Multiplexing)? Problem 9 (10 points)  We have talked about different modulation techniques such as amplitude-shift keying (ASK), frequency-shift keying (FSK), and phase-shift keying (PSK). If you were asked to design a communication network, which technique would you prefer? There is no single correct answer for this problem. Your score will depend on how you justify your choice and the specific advantage of your chosen technique. Congratulations, you are almost done with Exam 3.  DO NOT end the Examity session until you have submitted your work to Gradescope.  When you have answered all questions:  Use your smartphone to scan your answer sheet and save the scan as a PDF. Make sure your scan is clear and legible.  Submit your PDF to Gradescope as follows: Email your PDF to yourself or save it to the cloud (Google Drive, etc.).  Click this link to go to Gradescope: Exam 3 Submit your exam to the assignment Exam 3.  Return to this window and click the button below to agree to the honor statement. Click Submit Quiz to end the exam.  End the Examity session. 

Which factors contribute to low voter turnout in the United States? (pick all that apply)

What is the term for the right to be brought before a judge and informed of the charges and evidence against you?

___ are predominant residents of human’s normal microbiota 

When performing a Filter Paper Disk method, the clear zone around a disk is called ___

Which of the following is the defining feature of Enterococcus faecalis?

When performing a Kirby-Bauer plate, you should ___

Which cells are primarily involved in the pathogenesis of Stevens-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN)?

What is the key mechanism involved in the pathophysiology of TEN?

Lids invests a lot of their digital marketing efforts to draw customers into their online retail website when consumers are searching for hats and caps from their favorite sports teams. We would refer to this type of broad digital marketing approach as: