Hybrid integrated wavelength and reflectivity tunable III-V/Silicon transmitter

We demonstrate a novel wavelength-tunable hybrid silicon-based transmitter with integrated reflectivity tunable mirror. First, designs of a novel hybrid laser based on reflective symmetric and asymmetric Mach-Zehnder interferometer based mirrors are studied with single and double ring intra-cavity filters respectively. Asymmetric configuration is used in order to increase the tuning range of a single ring laser by more than 90 %. Furthermore, adjustment of the mirror reflectivity allows for control of laser characteristics such as threshold current, wall-plug efficiency, output power and linewidth. Finally, an ultra-compact hybrid tunable III-V/Si transmitter with more than 28 nm tuning range is then demonstrated based on such hybrid cavity design and one ring modulator. We successfully achieved modulation up to 40 Gbit/s and transmission over 20 (100) km at 25 (10) Gbit/s.