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V = (2πa/λ) × NA V = (2π × 25×10⁻⁶ / 1.55×10⁻⁶) × 0.2 V = (50π / 1.55) × 0.2 V ≈ (101.3) × 0.2 = 20.26 Fiber Optic Communication Systems Agrawal Solution Manual
