InAs/GaAs quantum dot laterally coupled distributed feedback lasers at 1.3 μm

Abstract

We report the InAs/GaAs quantum dot laterally coupled distributed feedback (LC-DFB) lasers operating at room temperature in the wavelength range of 1.31 μm. First-order chromium Bragg gratings were fabricated alongside the ridge waveguide to obtain the maximum coupling coefficient with the optical field. Stable continuous-wave single-frequency operation has been achieved with output power above 5 mW/facet and side mode suppression ratio exceeding 52 dB. Moreover, a single chip integrating three LC-DFB lasers was tentatively explored. The three LC-DFB lasers on the chip can operate in single mode at room temperature, covering the wavelength span of 35.6 nm.

Design of distributed feedback lasers grown on Si using time-domain traveling wave model combined with mode refractive index method

“…When utilizing lasers in wavelength division multiplexing (WDM) systems, distributed feedback (DFB) lasers have great significance. The DFB lasers can deliver a high side-mode suppression ratio (SMSR), narrow linewidth and stable output wavelength [9,10] by adjusting the grating period, making it a core component of long-distance optical fiber communication and WDM systems [11].…”