Tunable narrow-linewidth high-speed laser and modulation method thereof

The invention provides a tunable narrow-linewidth high-speed laser and a modulation method thereof. The laser comprises a substrate (1); the first temperature control carrier (2), the second temperature control carrier (3), the third temperature control carrier (4), the standard carrier (5) and the fourth temperature control carrier (6) are sequentially arranged on the substrate (1) at intervals along the light emitting direction of the laser chip; the laser chip comprises a gain region (7), a grating region (8) and a modulation region (9) which are sequentially arranged on the fourth temperature control carrier (6) along the light emitting direction; the collimating lens (10) is arranged on the standard carrier (5); a first F-P etalon (11) and an F-P etalon (12), the first F-P etalon (11) being arranged on the third temperature control carrier (4), and the second F-P etalon (12) being arranged on the second temperature control carrier (3); and the reflecting crystal (13) is arranged on the first temperature