The main function of laser driver is to enlarge high speed signal outputted by a multiplexer to drive the laser diode to work effectively. Figure 1.The modulation modes of laser driver Subsequent circuit of laser driver is light emitting device and there are two driving modes to drive it, as shown in the figure 1. One is directly working on laser diode. The main principle is to change the input current of laser diode and then the required optical digital signal is generated, which is called dire...(more)
In optical fiber communication, optical module plays a very important role. Laser driver used on the front end of optical emission can realize the laser bias and modulation. High speed voltage signal is converted into high speed current signal to modulate laser. Actually, a laser driver is a kind of high speed switching current and its circuits mainly include:(1) high speed modulation circuit; (2) high speed bias current driving circuit; (3) automatic power control circuit. Our company specializ...(more)
Thermoelectric cooler (TEC) is built on the thermoelectric system, which can both cool and heat, depending on DC current direction. As TEC has no refrigerant, no pollution, no rotation parts, no noise, long service lifetime and some other advantages, it has been widely used in electronic fields, laser fields and so on. The physical photos of TEC According to temperature, TECs can be divided into two types, regular temperature rectangular TEC and high temperature rectangular TEC. The temperature...(more)
With the development of science and technology, there are more and more researches about thermoelectric cooler ( TEC ) and the achievements on the improvement of the material optimal value and the optimization of thermoelectric cooler has been obtained. Now TEC has been widely used in many fields, and along with the time and research development, TEC will play more and more important role in the electronic and some other fields. （1）Theoretical study of TEC technology is mature. Low optimal va...(more)
Thermoelectric cooler ( TEC ) is built based on Peltier effect. It is a kind of solid components, which has no pollution, high reliability, small size, rapid cooling, rapid heating and some other characteristics. It has been widely used in electronic, medicine, industry, agriculture and some other fields. However, TEC still has some problems. 1.In order to reach the equivalent cooling efficiency of mechanical compression refrigeration, the material optimal coefficient of TEC is not high, which i...(more)
During the cooling process of thermoelectric cooler ( TEC ), the dissipating effect has direct effect on the cooling performance. The bad performance of heat transfer will cause the temperature rise on hot-side, thus the cooling capacity will reduce a lot. Under certain current, heat transfer from hot side to cold side can be reduced with the decrease of temperature. Only when the heat on the hot-side is drained away in time to maintain different hot-side temperature, the cold side can continuou...(more)
Thermoelectric generator ( TEG ) is built based on Seebeck effect to convert heat directly into electricity. In the open circuit composed with two different conductors, if there is temperature difference on the two contact points of the conductor, electromotive force will come into being in this open circuit. The polarity of the output voltage depends on the polarity of the temperature difference on both ends of the TEG. If the hot end and the cold end of TEG are swapped over, the polarity of th...(more)
The MTBF for standard TECs is at least 200,000 hrs, which is based on relatively stable running conditions, with several times ON/OFF per day during operation. However, in other applications, the power is frequently on/off, especially in constant temperature controller application. There is a test for research the influence of the on/off switch cycle to the TECs in a constant temperature. Install the TEC module with silicon grease between a couple of convector radiators. The load time of the cur...(more)
