Plug-in type 1.3-/spl mu/m fiber amplifier module for rack-mounted shelves

The success of digital and analog signal transmission experiments using Pr-doped fibre amplifier (PDFA) modules has resulted in the need to develop a plug-in type PDFA module, which is assembled on a printed-board for practical field applications. In order to achieve this, it is essential to have highly efficient Pr/sup 3+/-doped fiber and high-power laser diodes (LDs). We believe we have developed a PbF/sub 2//InF/sub 2/-based fluoride single-mode fiber with the highest reported gain coefficient and a wavelength-stabilized high-power 1.02-/spl mu/m LD module using the fiber Bragg grating technique. This paper reports on a plug-in type PDFA module, which we have developed using the above fiber and LD module.