In the system of optical communication, laser driver is an important part of an optical transmitter and it provides enough current to drive laser diode with direct modulation or enough voltage to drive electoral absorption device with indirect modulation. In order to meet different demands of design, our company has developed a variety of series of laser drivers and laser controllers : ultra-low noise laser controllers, high efficient laser controllers, high efficient laser drivers, dual channel...(more)
c) In order to avoid TECs losing effect due to obvious mechanical vibration, do not place any large mass device without support on the cold end of TECs. When involving lass mass device, its better to use chucking to fix the TECs between heat sinks and the object. Or place the device on a cold plate that can be media at first. At this time, damping screws can effectively increase the shear strength of the whole mechanical system. d) The TECs shall insulate from moisture in the air in order to avo...(more)
With the development of science and technology, laser technology has been used in many fields, such as national economy, national defense construction and so on. And it has wide applications in long-distance communications, digital signal storage and recovery, laser ranging, robotics, holographic application, medical diagnosis, etc. Picture ofthe laser driver However, laser has strict requirements for working conditions, that is, under the conditions of inappropriate work or storage, the perform...(more)
Laser is a kind of light source components. In actually, drive circuit refers to modulation circuit of light source device, which plays a role of converting digital signal to optical pulse signal and then sending to fibers. This part is the core of optical transmitter, which decides many important technical parameters. As shown in figure 1, the main function of laser drive circuit is to provide appropriate bias and modulation current for laser diodes, which can make laser work normally. Thereint...(more)
Based on the Piltier effect, thermoelectric cooling is an energy conversion process, using electric energy as power, that is: when the direct current is through two different conductive materials, nodes will have endothermic phenomenon (when the current is in the opposite direction, exothermic phenomenon will be generated). As the Peltier effect of semiconductor materials is very obvious, the thermoelectric modules are mostly made up of semiconductor materials at home and aboard. In the practica...(more)
A glass encapsulated thermistor mainly plays a role of temperature compensation. There are some kinds of packaging materials, such as epoxy resin, SMD, glass and so on. The glass encapsulative has high temperature resistance and moisture resistance. However, comparing with some other packaging forms, its responding speed is a little slow, around ten senconds. Application range 1. Temperature control and detection forhousehold appliances, such as air conditionor, microwave oven, electric fan and ...(more)
Thermistor is a kind of sensitive elements, which can be divided in two types, PTC thermistor and NTC thermistor , according to different temperature coefficients. The typical characteristics of thermistor are that at different temperatures, it can show different resistance values. With increase of temperature, the resistance of PTC can increase and the resistance of NTC can decline. PTC and NTC both belong to semiconductor devices. PTC came out in 1950 and then in 1954, PTC started to use bariu...(more)
Since the TEC module structure is constructed in a solid state, its common to regard it as having high reliability. In most applications, TECs can provide long term fault-free services. At present, in many practical applications, the service life of TECs exceeds 20 years, longer than other relative devices. However, failure rate is closely related to the application environment, so its difficult to achieve detailed reliability of TEC modules. For some stable cooling applications, a stable and co...(more)
