- Over 1 55 Jim Fiber Optic Communication Transmits 10 Gb S Non Return To Zero Signals A Standard Singlemode Fiber The Tr 1 (63.49 KiB) Viewed 32 times
Over 1.55-jim fiber-optic communication transmits 10-Gb/s non-return-to-zero signals a standard singlemode fiber. The transmitter is composed of a laser diode (linewidth=5 MHz) followed by a chirp-free Mach-Zehnder modulator. The extinction ratio of the signal is 5 (+7 dB) and the average output power of the transmitter is 0.5 mW. The fiber has a loss coefficient of 0.25 dB/km and a dispersion of 10 ps/nm/km. The receiver is composed of a PIN detector with a quantum efficiency of 50% and a load resistor of 5000, followed by a 40-dB gain electrical amplifier with a noise figure of 6 dB. Estimate the loss-limited transmission distance and dispersion-limited transmission distance of the system, and then determine the maximum transmission distance. The noise temperature is 400 K and the system can tolerate the pulse broadening up to the half the bit duration. The target bit-error ratio is 10^-3