Tunable V-Cavity Laser Monolithically Integrated with Traveling Wave Mach-Zehnder Modulator

We present the monolithic integrated widely tunable V-cavity laser and traveling wave Mach-Zehnder modulator operating in the C-band. A wide wavelength tuning of 64 channels from 1513 nm to 1565 nm is obtained with SMSRs mostly over 40 dB. The $\text{V}_{\pi }$ is 5.5 V and the static extinction ratio is 14 dB. The 3-dB electro-optic bandwidth is measured to be 14.2 GHz. By optimizing the device structure and thickness of intrinsic region on a semi-insulating substrate wafer, a theoretical bandwidth over 40 GHz can be achieved.