For the hybrid transmission system with dispersion compensation, the requirements for the optical power entering the fiber should be consistent with the requirements of the original non- coherent…

Question

Options

• ATrue
• BFalse

• A
  73% (11)
• B
  27% (4)

Explanation

Option A is correct because dispersion compensation in a hybrid system addresses the timing/phase distortion caused by chromatic dispersion, but it does not alter the fundamental optical power constraints governing the fiber link. The fiber's nonlinear thresholds (stimulated Raman scattering, four-wave mixing, self-phase modulation) and the minimum received power requirements are properties of the fiber and detection scheme, not the dispersion management strategy - so the original power window remains binding.

Option B is wrong because it incorrectly implies that adding dispersion compensation somehow relaxes or changes the power envelope. Dispersion compensation (whether via DCF modules, FBGs, or electronic post-processing) operates independently of the power budget; the signal must still enter the fiber within the same safe power range to avoid nonlinear penalties and ensure adequate SNR.

Memory tip: Think "DCF fixes time, not power." Dispersion compensation corrects pulse spreading along the time axis, but the power axis - bounded below by noise and above by nonlinearities - is set by the fiber itself and stays fixed regardless of what compensation scheme you bolt on.

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