Question

Consider an optical communication system operating at l ~ 800 nm. Suppose, only 1% of the optical source frequency is the available channel bandwidth for optical communication. How many channels can be accommodated for transmitting audio signals requiring a bandwidth of 8 kHz ?

(a)  4.8 × 10⁸

(b)  48

(c)  6.2 × 10⁸

(d)  4.8 × 10⁵

Answer 1

Correct option (a) 4.8 × 10⁸

Explanation:

 Optical source frequency

Bandwidth of channel (1% of above) = 3.8 × 10¹²Hz Number of channels = (Total bandwidth of channel) / (Bandwidth needed per channel)

(a) Number of channels for audio signal