For a coherent system, the reference point of the fiber-in optical power in the non-standard fiber- in scenario is the output port of the optical amplifier board at the sending end.

Question

Options

• ATrue
• BFalse

• A
  85% (39)
• B
  15% (7)

Explanation

In coherent optical transmission systems operating under a non-standard fiber-in scenario, the reference point for measuring fiber-in optical power is indeed defined at the output port of the optical amplifier board at the sending end - making option A correct. This reference point is chosen because it represents the precise, measurable location where the amplified optical signal exits the transmit-side equipment and enters the fiber span, providing a consistent and unambiguous measurement baseline. Option B is incorrect because denying this definition would contradict the standardized engineering convention used to ensure accurate power budgeting and system performance evaluation in coherent deployments. The non-standard fiber-in scenario specifically requires this explicit reference point because the typical demarcation (e.g., the ODF or patch panel) may not apply, so the amplifier output port substitutes as the agreed-upon boundary.

Memory tip: Think of the optical amplifier output port as the "launch pad" - in a non-standard scenario where the usual entry point is absent, the last active component (the amplifier) at the sending end defines where the fiber "officially" begins for power measurement purposes.

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