In this research paper, an automatic solar tracker based on gear system is designed and developed. The solar tracker follows the sun from east to west during the day. Driving software has been developed using FLOWCODE and then it is burnt into the microcontroller (PIC 16F72). An intelligent sensor board followed by a sensor circuit has been used to sense the position of the sun.The system has been programmed to detect the intensity of sunlight by a differential arrangement of two LDRs and subsequently actuate the motor to position the solar panel where it can receive maximum sunlight. The solar tracking system is a mechatronic system that integrates electrical and mechanical systems and computer hardware & software. The driving gear system and the structure of the PV module have been developed by using the locally available materials.In our research, the efficiency of this automatic solar tracker is 15% higher than the conventional tracker because of the designing automatic solar tracker and has got it successfully.This reveals that our system is compatible with the additional energy production.

Optical waveguides are characterized by regions of high refractive index bounded by regions of lower index regions and can be categorized as planar, channel, and fiber guides. Monochromatic Laser light is used as the signal carrier through the optical waveguide. If the strength of Laser light is increased, the repeater distance of an optical fiber network can be increased. So to obtain high intensities, it is usually necessary to focus laser beams into the higher index guided region of the optical waveguide where signal processing will take place. However, high laser intensity within a small guided region will cause nonlinear behavior of the waveguide. In this research work the refractive index of the waveguide is assumed to be the function of the square of electric field. Various guided structures are analyzed considering nonlinear refractive index. First the eigenvalue equation is solved to determine the confined guided modes and then the propagation of these modes through different structures are found using Beam Propagation Method (BPM). Since the efficiency of a nonlinear interaction depends at least linearly, and in many cases quadratically, on the interaction distance, clearly there is a trade-off in the efficiency between high intensity and interaction length.