We report the first experimental demonstration of a single-electrode-controlled digitally wavelength switchable V-coupled-cavity laser with high side-mode-suppression-ratio (SMSR) in the $40\mathrm{dB}$ range. Sixteen-channel and twenty-six channel wavelength switchable lasers with $100\mathrm{GHz}$ spacing are demonstrated with the maximal SMSR of $40\mathrm{dB}$ and $37\mathrm{dB}$ , respectively. They do not require complex gratings, multiple epitaxial growths, or complex tuning algorithms. The device size is only $500\mathrm{\mu m}\times 300\mathrm{\mu m}$ . Such a simple, compact, and high-performance laser has great potential as a low-cost alternative to existing complex tunable lasers for wide deployment in optical networks and beyond.