Single laser high selectivity bidirectional transmission system for local area network applications.
01 January 1987
Bidirectional transmission at 90 Mbit/s over km of fiber using a single laser source is demonstrated. At the subscriber end, a narrowband resonant optical amplifier, serves not only as amplifier, but also as detector, modulator, and optical filter. The coherent Rayleigh noise, encountered in previous single laser bidirectional systems, is eliminated by using a subcarrier modulation scheme. The demonstrated capacity is more than an order of magnitude improvement over similar systems.