The invention discloses a
wavelength-tunable electro-absorption modulated
laser and a preparation method thereof. The
laser comprises a substrate, and a first modulator region, a first
gain region, a
grating region, a second
gain region and a second modulator region which are sequentially arranged on the substrate and are positioned on the same plane,
phosphorus ions are doped in constituent materials of the first modulator region and the second modulator region. The first
gain region and the second gain region are used for exciting
laser with various wavelengths under the action of different direct currents; the
grating area is used for carrying out
mode selection on the various wavelengths; the first modulator area and the second modulator area serve as light emitting ends to emit
tunable laser, and double-end laser emission is achieved. The two electro-absorption modulators and the
wavelength tunable laser are integrated back to back, a
wavelength tuning area is shared, and bandwidth doubling is achieved. Through epitaxial growth of one-time active material and one-time passive material, integration of three forbidden bandwidth materials is realized, the manufacturing process is simplified, and the performance of the device is improved.