We have demonstrated simultaneous bidirectional transmission of signals over a 2-km monomode fiber link utilizing only a single light source. This is potentially significant for subscriber loops and local area networks wherein a major part of the cost may be contained within semiconductor lasers used as the source elements. In the system described here, one source is used both to provide data transmission in one direction and as a light source for transmission in the other direction, the encoding being achieved in the latter case by means of an integrated optic modulator in a reflecting configuration. The data rates employed in our demonstration system are 565 Mbit/s (forward direction) and 34 Mbit/s (reverse direction). Both signals are carried simultaneously by a single monomode fiber.
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