Ld Far-field Intensity Of Mathematical Modeling And Its Characteristic Parameters Of Measurement And Control,

With the progress of our society and the development of technology, more and more information is required by people. The optical communication is taking place of traditional electronic communication and the DWDM is a quite promising technique. It is obvious that 980nm LD is important as the pump of DWDM. So the coupling efficiency of LD(Laser Diode) and SMF(Single Mode Fiber) is a very important topic.Production technology and other reason cause different LD parameters of individual. Production firm can only give typical values, so carrying on with typical values in coupling efficiency estimation must cause inaccuracy and the misjudgment of the result. With the increment of the working time, the temperature change of the LD will further influent of the parameters like light power, etc. So it is a horrible thing to use such LD in coupling experiments.This paper discusses how to control a power controller of LD named LDC3900 which is manufactured by ILX cooperation via software written by Labview, a product of NI cooperation. The stable parameters such as current, voltage, power and temperature of LD can be provided through the controller of LD connected with LDC3900.With the control of the parameters of LD, the steady LD power can be offered for the coupling experiment.This paper also deduces the expression of the far-field light beam intensity distribution of LD at any location, establishes a mathematical model and draws a set of distribution curve of far-field light beam intensity of LD at some special locations. The foundation of the mathematical model mentioned in this paper can not only guide the detecting work of the far-field light intensity distribution of LD, but also guide the coupling with LD and SMF in order to shot the time which is needed in the coupling experiment.Although this paper is based on the 980nm LD, but the conclusion of this paper isnot merely applied to the 980nm LD.