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 10 km was investigated under 25 Gbps and 43 Gbps 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 costeffective transceiver module. In this study, we used the temperature-tolerant InGaAlAs materials in an EA modulator. A wide temperature ranged 12 km transmission with over 9.6 dB dynamic extinction ratio was demonstrated under 25 Gbps modulation. A 43 Gbps 10 km transmission was also demonstrated. The laser achieved a clear, opened eye diagram with a dynamic extinction ratio over 7 dB from 25◦C to 85◦C. The modulated output power was more than +2.9 dBm even at 85◦C. These devices are suitable for next-generation, high-speed network systems, such as 40 Gbps and 100 Gbps Ethernet. key words: electro absorption modulator, EA, DFB laser, uncooled, InGaAlAs, Ethernet, 40 Gbps, 100 Gbps