MULTI-WAVELENGTH NARROW-LINEWIDTH SINGLE-FREQUENCY OPTICAL FIBER LASER SOURCE FOR LASER RADAR SYSTEM

摘要

Provided is a multi-wavelength single-frequency optical fiber laser source for a laser radar system, comprising: a resonant cavity composed of a high-reflectivity chirped optical fiber grating (1), a high gain optical fiber (2), and a low-reflectivity chirped optical fiber grating (3); a single-mode semiconductor pump laser (5) as a pump light source; an optical wavelength division multiplexer (4); an optical coupler (6); an optical isolator (7); an optical circulator (8); an optical filter module (9); and a semiconductor optical amplifier (10). The pump light source performs optical fiber core pumping with respect to the high gain optical fiber (2). Wide-spectrum laser light output from the optical wavelength division multiplexer (4) is split by the optical coupler (6), and then a portion of the wide-spectrum laser light enters into the optical filter module (9) via the optical circulator (8), and is filtered by the optical filter module (9) to obtain a wavelength corresponding to a specific central frequency. The laser light returns into the resonant cavity via the optical circulator (8) and the optical coupler (6), to implement self-injection locking on the resonant cavity. Multi-wavelength laser lasing with a narrow linewidth and single longitudinal mode is implemented by combining a short linear resonant cavity structure and the optical filter module (9), and ultimately a stable multi-wavelength output and multi-wavelength single-frequency laser output meeting laser radar standards are realized.