Which type of measurement should be used to ensure that a laser is working properly in a single-mode fiber? A. Optical insertion loss b. Optical return loss c. Attenuation 4. How many OC signals are combined into a 40 Gbps SONET network? A. 768  b. 192 c. 256

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3. Which type of measurement should be used to ensure that a laser is working properly in a single-mode
fiber?
A. Optical insertion loss
b. Optical return loss
c. Attenuation
4. How many OC signals are combined into a 40 Gbps SONET network?
A. 768
 b. 192
c. 256

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