Power supply of laser pointer is three pieces of AAA batteries

Power supply of laser pointer is three pieces of AAA batteries. 
Directly modulated optical transmitter, the RF signal after RF amplification, electronically controlled attenuation and pre-distortion compensation, direct-drive laser, the optical output intensity varies with the RF signal intensity changes. For the stability of the laser, the ATC is necessary, the general temperature control of laser die at 25 ° C; laser light power and nonlinear distortion depends on the bias current, bias control and pre-distortion compensation for optical transmitters key components; optical transmitter carrier to noise ratio and nonlinear distortion index depends on the optical modulation system, automatic control of the optical modulation system is also excellent optical transmitter must. laser pointer is with learning code.
Direct intensity modulation process, with the changes of the RF signal strength, the light frequency (or wavelength) changes, the additional frequency modulation, which is unwanted frequency modulation effects, these additional frequencies of light in optical fibers can cause dispersion, one of the reasons for the nonlinear distortion of optical transmission systems, directly modulated optical transmitter of the second order distortion products - especially the combination of second-order distortion (CSO) are more C / CSO, lower, about 60dB or so; In addition, direct modulation of the optical transmitter output optical power is relatively small, mostly in 20mW; These are the inadequacies of direct intensity modulation techniques, but due to the optical transmitter is a simple structure, low manufacturing costs, short-distance optical transmission The system has been widely used in today's wired network, 1310nm optical transmitter system accounts for more than 50% market share. Fiber fracture mechanism. Fiber fracture is due to the fiber in the fiber manufacturing process of micro-cracks in the role of the application of force, and gradually deepened, When microcrack deepened to more than the critical value, the fiber breaks. Fused fiber coupler production method is simple, cheap and easily with an external fiber-optic connections to become a whole, and can be resistant Fu mechanical vibration and temperature change, the current manufacturing technology of the mainstream market.
The opening sleeve using a highly flexible material, such as phosphor bronze, beryllium copper and zirconia ceramics produced when the pin is inserted into the sleeve after the sleeve pin of the clamping force should remain constant, these three materials sleeve application, but the majority of beryllium bronze and zirconia ceramic.