Quantum well interferometric modulator monolithically integrated with 1.55 mu m tunable distributed Bragg reflector laser

The first monolithically integrated laser/interferometric modulator is reported. The total chip length of 2.5 mm includes a 970 μm-long strained InGaAs/InGaAsP quantum well gain section, a 230 μm-long wavelength tuning section containing a distributed Bragg reflector grating, and an 800 μm-long active length Mach-Zehnder modulator based on electrorefractive InGaAsP/InP quantum wells. 4 V pushpull drive voltage produces 12.5 dB modulation depth with −9 dBm optical power coupled into a cleaved fibre.