Asymmetric equivalent apodization sampling optical grating and laser based on reconstruction-equivalent chirp

Abstract

The invention discloses an asymmetric equivalent apodization sampling optical grating and a DFB semiconductor laser based on reconstruction-equivalent chirp technology. The optical grating inside a laser cavity is a sampling optical grating based on the reconstruction-equivalent chirp technology. A sampling optical structure comprises an equivalent optical grating corresponding to an ordinary Bragg grating, the phase shift of the equivalent optical grating is introduced through the equivalent chirp technology, and equivalent apodization section optical gratings with different apodization degrees are introduced to the left side and the right side of the equivalent phase shift area. The refractive index modulation intensity gradually becomes larger from the middle to the two ends through the apodization structure of the sampling optical grating in the cavity, the space hole-burning effect can be effectively weakened, and the single longitudinal mode stability of the laser is improved when the laser works in a high-power mode. Due to fact that the apodization degrees of the left side and the right side of the equivalent phase shift are not symmetrical, the intensity of the optical grating is not symmetrical, the feedback functions to the light are not equal, the frequency stability of the laser can be improved when the laser works in the high-power mode, and the effective output laser power of the end face can be improved under the condition that the laser power is constant.

Description

technical field [0001] The invention relates to the field of optoelectronic devices and photonic integrated chips, in particular to an asymmetric equivalent apodized sampling Bragg grating based on reconstruction-equivalent chirp technology and a DFB semiconductor laser thereof. Background technique [0002] High power, single longitudinal mode, narrow linewidth distributed feedback (DFB) semiconductor laser is the core light source of modern optical fiber communication technology. In order to improve the single longitudinal mode yield of DFB semiconductor lasers, a λ / 4 phase shift is introduced at the center of the laser cavity, but the λ / 4 phase shift structure makes the optical field distribution of the laser discontinuous at the center of the cavity, and in the center There is a sharp peak at the position, and the high concentration of the optical field in the center leads to a large consumption of carriers here, resulting in a spatial hole-burning effect. The spatial h...

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Problems solved by technology

[0027] In order to overcome the deficiencies in the prior art, the present invention provides an asymmetric equivalent apodized sampling grating and its distributed feedback (DFB) semiconductor laser based on the reconstruction-equivalent chirp technology to solve the problems in the distributed feedback In the (DFB) semiconductor laser, the problem of suppressing the space hole burning effect and increasing the effective output laser power of the end face is realized at the same time, so that when the laser power is constant, the effective output laser power of the laser end face is increased, the space hole burning effect is suppressed, and the laser is increased. Single Longitudinal Stability and Effect of Narrowing Laser Linewidth at High Power Operation

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