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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{V}_{\pi }$ </tex-math></inline-formula> 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.