JEE Main · 2019 · 08 Apr 2019 · Shift 1 · EM Waves

The wavelength of the carrier waves in a modern optical fiber communication network is close to:

(A)1500 nm✓ Correct
(B)600 nm
(C)2400 nm
(D)900 nm

Answer: (A)

Solution

Silica optical fibres are run at the wavelengths where the glass loses the least light, the low-loss windows near

1310

nm and especially

1550

nm in the near infrared. Of the values offered,

1500

nm sits squarely in that minimum-loss region, so it is the carrier wavelength used in such networks.

JEE Main · 2019 · 08 Apr 2019 · Shift 1 · Single correct option

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