St. Lee et Cj. Chae, Low-cost bidirectional optical amplifier using a unidirectional Er-doped fiber amplifier and a fiber Mach-Zehnder interferometer, IEEE PHOTON, 13(1), 2001, pp. 76-78
We propose a cost-effective bidirectional optical amplifier consisting of a
single unidirectional Er-doped fiber amplifier and a fiber Mach-Zehnder in
terferometer (MZI), We demonstrated its feasibility by observing the optica
l spectra and measuring bit error rates when four optical signals were bidi
rectionally transmitted at 2.5 Gb/s over a 160-km single-mode fiber. A net
gain of 17 dB and a power penalty of 0.5 db were obtained.