Study on the sweeping characteristics of tunable semiconductor laser sources with external cavity feedback
The semiconductor laser source is critical in Lidar,space detection,and optical fiber intelligent perception.Particularly,tunable semiconductor laser sources are essential for measuring wavelength/polarization-dependent loss in optical devices within the next-generation reconfigurable optical division multiplexing systems.An external cavity feed⁃back tunable semiconductor laser based on the Littman configuration offers a solution for achieving broad tuning ranges,high spectral purity,and mode-hop-free lasing output.A gain chip with a central wavelength of 1 526.276 nm and a 3 dB bandwidth of 111.005 4 nm shows significant potential as an internal cavity seed source,with different wavelengths stabi⁃lized in the oscillator via a blazed grating.Additionally,a maximum sweep speed of 200 nm/s,a minimum trigger interval of 5 pm,an intrinsic linewidth of less than 10.02 kHz,and a single longitudinal mode sweep frequency output of 130 nm without mode-hopping are demonstrated.These results highlight the excellent wide-spectrum optical properties of the In⁃GaAsP/InP gain chip and the effectiveness of the Littman feedback principle.This study advances the development of fast wavelength scanning test systems and enhances the accuracy and efficiency of device testing.
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