7. (a) With the aid of simple diagrams, describe the basic principle of coherent optical detection. [7] (b) Explain why
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7. (a) With the aid of simple diagrams, describe the basic principle of coherent optical detection. [7] (b) Explain why
7. (a) With the aid of simple diagrams, describe the basic principle of coherent optical detection. [7] (b) Explain why coherent optical detection can improve receiver sensitivity and achieve much higher capacity in the same bandwidth compared to intensity modulation and direct detection. [16]
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