Which statement best describes optical return loss (RL) and optical insertion loss (IL)?

Which statement best describes optical return loss (RL) and optical insertion loss (IL)?

• A. RL is the forward power loss; IL is the reflected power ratio
• B. RL is the reflected power ratio back toward the source; IL is the forward power loss through the connection
• C. RL measures reflections toward the source; IL measures forward loss
• D. RL is the forward power ratio measured at the far end; IL is the backward loss

Answer: (B)