Simulation Of Three-sections Monolithic Integrated DFB Laser

As the practical light source in the field of optical fiber communication,semiconductor laser has the advantages of high electro-optic conversion efficiency,wide range output wavelength,long working life and easy electric modulation.In recent years,it has been paid more and more attention by researchers.The output wavelength of distributed feedback(DFB)semiconductor laser is stable,monochromatic and easy to integrate.Based on this,the DFB semiconductor laser based on monolithic integration is proposed to produce more widely used high-quality lasers.Traditional semiconductor lasers are often used as discrete devices in optical fiber communication systems.The shortcomings of a huge system,high energy consumption and vulnerability to environmental impacts brings very bad influence to the application of semiconductor lasers.Single-chip photonic integration technology that can integrate semiconductor lasers with other optical devices as a whole system with compact structure,small size and high reliability will generate the suitable signals for wider applications.Based on the optical mutual injection coupling method,a three-sections monolithic integrated DFB laser structure is proposed in this paper.The structure can be fabricated directly based on the whole growth of the current monolithic integrated process.The structure has stable performance and is conducive to large-scale applications.It is necessary to verify the feasibility of producing highquality laser by simulation before it is made.Based on the transmission line model of the laser,the traveling wave rate equations of the integrated laser are derived.The static and dynamic characteristics of the three-sections monolithic integrated DFB laser are simulated and analyzed by PICS3 D simulation software and MATLAB simulation software,respectively.The simulation provides theoretical support for the fabrication and application of monolithic photonic integrated devices.The three-sections monolithic integrated DFB laser is simulated by PICS3 D,its structure parameters,including the related parameters of the epitaxial layer materials and doping of the integrated laser,are analyzed and designed.The static characteristics of the three-sections monolithic integrated laser are analyzed,and the relative optimal fabrication parameters of DFB lasers are obtained,which provides a theoretical basis for the practical fabrication of three-sections monolithic integrated DFB lasers.The MATLAB is used to simulate and calculate the dynamic characteristics of the integrated laser,and the microwave signal is generated.The effects of laser grating coupling constant,bias current of every section,detuning and other parameters on the microwave signal of the integrated laser are analyzed.It provides theoretical support for the generation of microwave signals by integrated semiconductor lasers.