Question

An FSK coherent optical fiber system employing synchronous heterodyne detection

has a transmission wavelength of 1.3 μm where the fiber and splice/connector

losses average out at 0.4 dB km−1

. If 2 mW of optical power is launched into

the system link and an ideal photodetector is assumed, determine the absolute

maximum repeater spacing to maintain a BER of 10−9 at transmission rates of:

(a) 140 Mbit s−1

; (b) 2.4 Gbit s−1

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Answer 1

Answer:

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