DEVICE AND METHOD FOR GENERATING BROADBAND OPTICAL FREQUENCY COMB WITH ADJUSTABLE CENTRAL WAVELENGTH

Disclosed are a device and a method for generating a broadband optical frequency comb with adjustable central wavelength, and the invention relates to the technical field of optics. The device of the invention adopts a microwave frequency synthesizer to generate a high-power sinusoidal modulation signal with a frequency of 1.6GHz, and the sinusoidal modulation signal and the DC bias are superimposed by a T-shaped bias and loaded on a weakly resonant cavity Fabry-Perot laser, so that the laser presents a gain switch state. Then the continuous optical signal output by the first tunable laser source is injected into the gain-switched weakly resonant cavity Fabry-Perot laser in one direction after passing through the optical injection module and the optical circulator, so that the laser may output an optical frequency comb signal whose central wavelength may be tuned in a wide range and whose bandwidth changes periodically with an increase of the injected wavelength. In order to further improve the performance of the optical frequency comb, a second tunable laser source is additionally introduced, and double light is injected into the laser, so that an optical frequency comb signal with a wider bandwidth and a wide range of adjustable center wavelength may be obtained than that of single light injection. The invention is suitable for the fields of surveying, spectroscopy, optical communication, microwave photonics and the like.