OTN ultra-long-haul solution, using Dummylight can solve the problem of not being able to open Raman spans due to the small number of channels in the early stage of the project.

Question

Options

• ATrue
• BFalse

• A
  77% (20)
• B
  23% (6)

Explanation

A is correct because Raman amplification requires sufficient optical power in the fiber to function - power that comes from having multiple active channels. In early project phases when only a few traffic channels are lit, there isn't enough total power to sustain Raman gain across long spans. Dummy Light (unmodulated optical carriers at unused wavelengths) artificially fills those empty channel slots, boosting total in-fiber power to the threshold needed for Raman amplifiers to open and operate stably.

B is wrong because it denies a well-established practice in ultra-long-haul OTN design - Dummy Light is specifically engineered for this early-stage power shortfall scenario.

Memory tip: Think of Dummy Light as a "placeholder" - like adding fake weights to a barbell so the gym equipment (Raman amp) can still function properly even before the real load (live channels) arrives.

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