Abstract
Recent development in wavelength division multiplexing (WDM) technology have realized terabit-scale transmission utilizing a hybrid architecture including C-band and L-band of the telecommunication window.1 However, due to the ever-increasing demand for the transmission capacity, alternative bands have been continuously investigated. Practically, two bands have been considered as potential candidates. One is the second communication window at 1290– 1330 nm and the other is so-called S-band located at 1460–1510 nm region. Pr3+ (or Dy3+) and Tm3+ have been used as active ions for these two bands.2–4 These rare-earth ions, however, suffer strong multiphonon relaxation when doped into conventional silica glass. Therefore, host glasses have been limited to rather uncommon glasses such as tellurite, 2 fluoride3 and chalcogenide glasses.4
© 2002 Optical Society of America
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