Optical communication –WDM experiment system
The system simulate the communication principle of wavelength divison multiplex (WDM),
,the WDM  process is displayed ,Crystal electro-optic effect,acousto-optic effect and laser`s internal modulation technologies are respectively used  to modulate the three channels and to transmit audio signals and video images,
Purpose of the experiment and related  subjects:
l        All-optical network.
l        Wavelenght Division Multiples  ,solution reuse .
l        Electro-optical characteristics of semiconductor lasers.
l        Electro-optic effect of crystal.
l        Acousto-optic effect,
l        Electro-optic effect of liquid crystal.
l        Internal modulation and external modulation of signal,
l        Transmission of audio and video signal,
l        Working principles and application of photodiode,PN photoes,avalanche photodiode.
Features of the instruments :
l        The system can not only demonstrante the basic principles of WDM ,but also can carry out deep and detailed research the electro-optical properties of semiconductor lasers , electro-optical characteristics of crystals,electro-optical,properties of liquid crystal and caousto-optic properties of materials ,A large mumber of experimental devices  and alxundant contains  are in this experiment which is the ideal presentations ,research and laboratory  equipment for  optics and optical communication  professional.
Completes  set of equipment
l        Red laser 650 nm,green laser 532nm,blue laser 473nm
l        WDM  prism ,elctro-optic effect componets  of crystal  ,CCD  camera+monitor, various  recerption and amplification cimponents ,optica cross –component,fiber(multi mode), multi-band power indicator,various optical lenses, prisms ,polarizer ,grating,optical platform, oscilloscope(self-contained )and etc..