Hybrid FRA consisting of general fiber G652 and dispersion compensation fiber DCF includes DCF +G652, G652 +DCF and G652+DCF +G652. The operation principle is discussed. The optimum design of hybrid FRA has been done by using optimum design software of FRA--OptiAmplifier 4.0. The best structure is G652 +DCF. It can compensate dispersion and widen operation wavelength range of optical fiber network. Using Raman laser (1427 nm) as an exciting source, Raman gain spectrum and small signal amplification spectrum of optical fiber are measured by optical spectrum analyzer Q8384. The hybrid FRA has gain bandwidths of 88 nm in S and C band. It will increase the transmission channels of fiber communication network

The problem of configuring fiber delay lines (FDLs) for recirculation FDL buffer in a slotted and synchronous optical packet switched network is researched in this paper. By studying the distributions of the lost packet in switch with uniform degenerate buffers configuration, it is found that the lost packets arouse by the taking up of small granularity FDL are much more than the lost packets arouse by the taking up of large granularity FDL. So a good scheme to cut down the Packet Lost Ratio is by increasing the proportion of the small granularity FDL at a cost of decreasing the proportion of the large granularity FDL. Simulation results show this scheme is effective