Isamu Oshima, Katsuhiko Nishiyama, Katsuya Kurotori and Hirokazu Hayakawa
Abstract
Recently, WDM systems have been increasingly installed. As a result, we have been developing milan米兰体育官网 fiber amplifiers for WDM systems.
Compact milan米兰体育官网 fiber amplifiers for single channel and small channel applications are needed for SDH systems and for WDM systems to compensate for insertion losses of milan米兰体育官网 passive components. In response, we have developed compact milan米兰体育官网 fiber amplifiers using a coaxial pumping laser. However higher output power and higher gain have recently been demanded. Therefore, compact milan米兰体育官网 fiber amplifiers using a butterfly pumping laser or a mini-DIL pumping laser have been developed. These amplifiers are reported in this paper.
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