A four-laser array based on sampled Bragg grating distributed feedback (DFB) lasers in which each sampled period contains four phase-shift sections is proposed, fabricated, and experimentally demonstrated. The wavelength spacing between adjacent lasers is accurately controlled to 0.8 nm ± 0.026 nm and the lasers have single mode suppression ratios larger than 50 dB. Using an integrated semiconductor optical amplifier, the output power can reach 33 mW and the optical linewidth of the DFB lasers can be as narrow as 64 kHz. This laser array uses a ridge waveguide with sidewall gratings and needs only one metalorganic vapor-phase epitaxy (MOVPE) step and one III-V material etching process, simplifying the whole device fabrication process, and meeting the requirements of dense wavelength division multiplexing systems.
Based on four-phase shifted sampled Bragg gratings, a stable dual-wavelength DFB laser array is reported with frequency separations of 240 GHz, 320 GHz, 640 GHz, 800 GHz, and 1000 GHz.
A 1.55 μm dual-wavelength DFB laser with a frequency spacing of 1.28 THz using a four phase shifted sampled Bragg grating is demonstrated. The grating coupling coefficient is 2.83 times that of conventional sampled Bragg gratings while the frequency spacing resolution can reach 0.83 GHz.
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