As the number of operational optical fiber transmission systems increases, so does the need to Increase the transmission capacity of the systems already installed. A method gaining wide acceptance uses optical couplers enabling bidirectional transmission on a single fiber1 but carries a 6-dB loss penalty. This may be eliminated by operating at different wavelengths (1.3 and 1.55 µm) bidirectionally or unidirectionally.2

© 1988 Optical Society of America

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