An optical fibre communication link 5 km long is to be constructed with an analoguemodulation bandwidth of 1.0 MHz. The proposed system uses multimode step indexfibre with a core refractive index of 1.48 and a numerical aperture of 0.24. The fibreexhibits an attenuation of 2.5 dB/km at the operating wavelength. The emitter is a lightemitting diode that has a rise time of 10 ns and can launch 20 mW of optical power intothe fibre. No splices are required, but a loss of 1 dB is expected both where the fibre iscoupled to the source and to the detector. Determine, giving a clear explanation of yourreasoning, both the sensitivity and the bandwidth required of the detector in order toensure that the link will operate satisfactorily.

GivenAn optical fibre communication link 5 km long is to be constructed with an analogue modulation…

Answered: An optical fibre communication link 5…

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