Discussion
Emission wavelength of InGaAsP/InP device is :
Answer: C
An InGaAsP/InP device emits at about 1.3 µm.
The passage says the second generation systems used 1.3 µm sources and names InGaAsP/InP LEDs and laser diodes as the typical ones. The other numbers in the passage are not emission wavelengths: 25 nm and 2 nm are the spectral widths of the LED and the laser diode, which is why options A and B are wrong. 0.8 µm is the first generation wavelength, with which the passage compares the 1.3 µm loss.
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