With the power budget & rise time budget, find the approximate maximum safe-distance a digital link @ 7Gbps (Assume an A

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With the power budget & rise time budget, find the
approximate maximum safe-distance a digital link @ 7Gbps (Assume an
ASK RZ signal) by using the following components:
n 10 optical fibers: [each fiber length is 50km]: [attenuation
coefficient: 0.16 dB/km @ 1550nm, 0.24 dB/km @ 1310nm] [dispersion:
18 ps/(nm*km) @ 1550nm, 1 ps/(nm*km) @ 1310nm]
n One transmitter: 1550nm laser with linewidth 0.05nm and power
is 3 dBm
n Two receivers: ( A: -20 dBm PIN diode and bandwidth is 5 Gb/s)
(B: -32 dBm APD diode and bandwidth is 10Gb/s)
n Assume the loss is 0.1 dB per splice and 1 dB per
connector.