A long-distance transmission system using erbium-doped fiber amplifiers (EDFA) has been intensively investigated.[1],[2] In IM-DD system, an external modulation is essential to minimize the modulation induced chirp effect. In many long-distance transmission experiments, a LiNbO3 Mach-Zehnder modulator has been used. However, an electro-absorption (EA) modulator may be another candidate for this application although it was pointed out that it has inherent chirp.[3] The equivalent performance is expected for the EA modulator in the system with the dispersion well tuned to around zero. The purpose of this report is to demonstrate the capability of the EA modulator in such long-distance transmission by a circulating loop using EDFAs.

© 1991 Optical Society of America

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