Long-wavelength triangular ring laser for monolithic integration

We report the fabrication and testing of long wavelength triangular ring lasers operating at 1.26 micrometer. The triangular ring laser, fabricated in InGaAsP/InP, employs a ridge waveguide structure with the ridge and facets dry etched using high temperature CAIBE. Pulsed L-I, spectra and output characteristics are analyzed. Preliminary testing is done for ring lasers monolithically integrated with tapered amplifier. Temperature characteristics are studied by cooling the ring lasers with a TE cooler. Further work on noise characteristics require the use of optical isolator to reduce feedback from the optical fiber used in the measurement setup.