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We propose a novel structure that can reduce the power consumption and extend the transmission distance of an electro-absorption modulator integrated with a DFB (EADFB) laser. To overcome the tradeoff relationship of the optical loss and chirp parameter of the EA modulator, we integrate a semiconductor optical amplifier (SOA) with an EADFB laser. With the proposed SOA assisted extended reach EADFB laser (AXEL) structure, the LD and SOA sections are operated by an electrically connected input port. We describe a design for AXEL that optimizes the LD and SOA length ratio when their total operation current is 80 mA. By using the designed AXEL, the power consumption of a 10-Gbit/s, 1.55μm EADFB laser is reduced by 1/2 and at the same time the transmission distance is extended from 80 to 100 km. key words: electro-absorption modulator, semiconductor optical amplifier, DFB laser

Advantages of SOA Assisted Extended Reach EADFB Laser (AXEL) for Operation at Low Power and with Extended Transmission Reach