Coupler Mux Structures: a$.$ Explain the concept of coupler multiplexing and its significance in communication systems. b$.$ Describe the structure of a star coupler and its role in combining and distributing signals. Coupler Mux Types: a$.$ Discuss the fiber$-$fusion technique as a popular construction method for N x N star couplers. b$.$ Explain the concept of cascading $3-$dB couplers and how they can be used to construct larger coupler mux devices. Performance Evaluation: a$.$ Provide an example of coupler performance and discuss key parameters that determine the efficiency of a coupler mux. b$.$ Compare and contrast the performance of different coupler mux structures in terms of signal loss and power distribution. Applications and Integration: a$.$ Explore the applications of coupler mux in various communication links, including long$-$distance transmission systems and metro networks. b$.$ Discuss the integration of coupler mux devices in fiber$-$to$-$the$-$premises $($FTTP$)$ networks and their role in enhancing connectivity. Evolution and Advancements: a$.$ Trace the evolution of coupler mux technology from basic designs to more advanced configurations like Dense WDM $($DWDM$).$ b$.$ Analyze the advantages of Dense WDM over traditional coupler mux structures in terms of scalability and spectral efficiency. Feel free to use these question couplings to delve deeper into the structure and applications of coupler mux in your studies!