The Design Of Data Acquisition System Based On Constant Temperature Control System Of Semiconductor Laser Diode

EDFA(Er Doped Fiber Amplifier) and online RAMAN amplifier, made the capacity and distance of the information transferred in optical fiber develop farther. Semiconductor laser diode, as a core device of optical fiber communication, has the character of high efficiency, small size, low weight, high reliability, direct modulation and high-integrated ability with other semiconductor devices. Semiconductor laser have been applied to spectrum ,communication,laser light and radar e.t field. In order to attain the high-effect and stable laser lamp-source, except design of stable antrum form, many influence factor(machine vibration,air harass ,environment temperature)must be take into account. Thereinto, for the stable character of laser, precision temperature control of inner crystal component has important effect. At the same time, semiconductor laser diode is very sensitive to the temperature. The fluctuation of surrounding temperature not only leads to the fluctuation of supply current, but also makes threshold current, quantum efficiency, output wavelength and output light intensity of the laser diode change greatly. No matter which field semiconductor laser diode is applied to, it is always expected to work long and steadily. Especially in the benthic optical fiber communication system, semiconductor laser diode is required to work more than 25 years. However, actually used semiconductor laser diode cannot meet people's demand. Except of factor of the laser diode itself, many other factors result in the deterioration and unsteadiness of the device, such as the fluctuation of surrounding temperature, improper drive current, frequent impulse and heat dissipation. Therefore, the stable and constant control of semiconductor laser diode is rather important. The stable and constant control system of semiconductor laser diode includes constant current control, constant power control and constant temperature control. This paper is belonging to the design and research category of constant temperature control system. The constant temperature control system include liner mode and switch...