Abstract
A WDM transmission system using three wavelength bands of 1.3μm, 1.47μm, and 1.55μm are proposed. Selection of these wavelengths enables to use popular optical couplers and to apply known optical amplifiers. Among three kinds of optical amplifiers, Tm3+-doped fiber amplifiers for the 1.47-μm band are constructed and the basic properties are experimentally clarified. Crosstalk between the 1.48-μm and 1.55-μm bands originating from isolation of the couplers and Raman scattering is found to make negligibly small by consid-ering the combination of the couplers and suppressing input optical power to the single mode fiber (SMF) under 6 dBm. Experiments of repeaterless transmission over 50-km SMF showed error free performance in 10Gb/s×6 WDM case where two signal lights with different wavelength in each band are launched. Finally, utility of the 1.47-μm band is theoretically discussed.
