High-Speed EA-DFB Laser for 40-G and 100-Gbps

We have developed a high-speed electroabsorption modulator integrated distributed feedback (EA/DFB) lasers. Transmission performance over 10km was investigated under 25Gbps and 43Gbps modulation. In addition, the feasibility of wide temperature range operation was also investigated. An uncooled EA/DFB laser can contribute to the realization of low-power-consumption, small-footprint and cost-effective transceiver module. In this study, we used the temperature-tolerant InGaAlAs materials in an EA modulator. A wide temperature ranged 12km transmission with over 9.6dB dynamic extinction ratio was demonstrated under 25Gbps modulation. A 43Gbps 10km transmission was also demonstrated. The laser achieved a clear, opened eye diagram with a dynamic extinction ratio over 7dB from 25°C to 85°C. The modulated output power was more than +2.9dBm even at 85°C. These devices are suitable for next-generation, high-speed network systems, such as 40Gbps and 100Gbps Ethernet.