Discussion
Importance of 1.3 µm range in optical communication arises to the fact that the :
Answer: B
The importance of the 1.3 µm range is that the bandwidth is highest.
The passage says that at 1.3 µm material dispersion becomes extremely small, so the information-carrying capacity is limited only by intermodal dispersion, and single mode fibre removes even that. Less pulse spreading means a higher bit rate for a given length, that is, a higher bandwidth.
Attenuation (A) is smaller at 1.3 µm than at 0.8 µm, as the passage says, but it is not the lowest: the loss spectrum printed with the passage reaches its minimum near 1.55 µm. Component availability (C) is not the physical reason. Impurities (D) do affect transmission; the water-related loss peak near 1.4 µm in the same figure is one.
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