2. Consider a system operating at a 1300 nm wavelength at a 100 Mbs-1 data rate with the following
components:
Transmitter: InGaAs LED producing 50 milli W into a fiber pigtail. The spectral width is 40 nm.
Connectors: 1 dB losses.
Fiber:
- Losses = 1.5 dB/km.
- Intermodal bandwidth-distance product (measured in 1 km sample) = 800 MHz.km.
- Mode mixing-moderate mode mixing observed (q = 0.7)
- Lengths-any length is available.
Receiver:
- InGaAs pin photodiode with a connectorized pigtail
- Sensitivity required for a BER = 10-9' is given by
where PR is in dBm and BR is the data bit rate in Mb.s-l.
- Allowance for aging, etc.: 6 dB.
- Coding: NRZ.
With these specification and assuming other parameters, write a technical feasibility report to layout a system which supports the total length of fiber in LAN as 75 Km.