Which three components does the single module ROADM combine into a single slot line card? (Choose three.)

Question

Options

• Areconfigurable optical add/drop multiplexer
• Boptical spectrum analyzer
• Ccoherent transceiver
• Derbium-doped fiber amplifier
• ERaman amplifier
• Fdispersion compensation

• A
  93% (38)
• E
  2% (1)
• F
  5% (2)

Explanation

A single-module ROADM integrates three traditionally separate optical network functions - the ROADM itself (A) for wavelength switching and routing, an optical spectrum analyzer (B) for in-built optical performance monitoring, and an EDFA (D) for on-board optical amplification - all onto one slot line card. This integration reduces chassis space, simplifies cabling, and lowers operational complexity compared to housing each function in a separate slot.

Why the distractors are wrong:

• C (Coherent transceiver): Transponders/coherent transceivers are client-side or trunk-side pluggable modules that handle data encoding; they are not part of the ROADM switching fabric itself.
• E (Raman amplifier): Raman amplification is a distributed technique applied in the fiber span, not a component integrated into the ROADM line card.
• F (Dispersion compensation): Dispersion compensation modules (DCMs) are passive optical devices placed in the transmission path, not embedded within the ROADM card itself.

Memory tip: Think "RAD" - ROADM + Analyzer (OSA) + DFA (EDFA). A single-module ROADM is rad because it does the job of three cards in one slot: switch it, monitor it, amplify it.

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