Discussion

Match List I with List II and select the correct answer using codes given below :

Answer: C

The correct matching is a-iii, b-iv, c-ii, d-i.

1440 nm lies near the water (OH) absorption peak around 1383 nm, so it is a high loss region (iii).
850 nm is the first window, served by cheap GaAs LEDs and silicon detectors: low cost (iv).
1300 nm is near the zero-dispersion wavelength of standard silica fiber, which allows high speed (ii).
1550 nm is the minimum-attenuation window, about 0.2 dB/km: low loss (i).

The codes printed as options A and D are identical and both give 1440 nm low loss and 1550 nm high loss, the reverse of the attenuation curve.

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