Long description of figure 2

The diagram shows the path from the pattern generator to the phase shift keying modulator (155 Mbit/sec) to the acoustically phased modulator to wavelength 1 to a directional coupler. It also shows the path from the distributed feedback laser to the optical splitter to the isolator to the erbium-doped fiber amplifier to the acoustically tuned filter to the acoustically phased modulator to a directional coupler. It also shows the path from the laser to the optical splitter to wavelength 2 to a directional coupler and to wavelength 4 and wavelength 3 to a directional coupler. Finally it shows the path from the directional couplers to the optical splitter to the acoustically tuned filter to the photodetector to the frequency shift keying demodulator to bit error detection.

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