Effect of reflections on unisolated 2.5 Gbit/s gain-coupled 1300-nm DFBs over the -20/spl deg/C to +85/spl deg/C temperature range

Summary form only given. We have investigated gain-coupled 1300-nm DFB lasers for 2.5 Gbit/s operation without optical isolators to understand the affect on the system performance. Wide-temperature operation of unisolated 2.488 Gbit/s gain-coupled DFBs with grating strength of 90 cm/sup -1/, exhibit no saturation of the BER curve. The measured penalty is <1 dB worst case up to -14 dB optical return loss. These results highlight the fact that gain-coupled 1300-nm uncooled DFBs could be used in low-cost unisolated modules at 2.488 Gbit/s over the -20/spl deg/C-+85/spl deg/C temperature range.