Optical fiber communication equipment form a complete set of heating refrigeration type thermostatic bath!
As is known to all, all of the semiconductor devices are more sensitive to changes in temperature, especially for LD.
LD of the threshold current Ith as temperatures rise and become bigger, if the original offset current IB unchanged, and LD luminous power will reduce.
So a relatively constant temperature environment for LD is very necessary.
Using the thermistor with LD encapsulated in Rt can effectively monitor the LD working environment temperature.
When the temperature changes, the resistance changes of Rt, give ATC circuit changes the signal output, and ATC circuit after amplification processing control cooling device in LD component.
To achieve the purpose of the LD working environment temperature constant.
cooling method are many, such as forced cooling, constant temperature trough refrigeration and temperature cooling, etc.
The most advanced thermoelectric cooling.
Temperature thermocouple with special semiconductor materials, when in which current heat cooling at one end and the other end.