Abstract

Recently, distributed Er-doped fiber amplifiers have become of great interest.^1)-5) Intrinsic fiber loss can be compensated by the distributed gain. As a result, a fiber which is free from the attenuation can be realized.²⁾ Due to its small gain, the distributed EDFA also has the advantage of low amplified spontaneous emission(ASE). Moreover, no isolator to prevent lasing is necessary, so bi-directional transmission is possible. This kind of fiber is also applicable to soliton transmission.⁵⁾

© 1991 Optical Society of America