The Design Of A Test Analayzer For Wavelength Selective Switch Based On LabVIEW

Wavelength selective switch is the subsystem of ROADM developed in recent years rapidly，Compared with the last generation, the ROADM can provide better flexibility and control functions in thistechnology. The previous generation ROADM equipment to handle its internal wavelength used isrelatively simple, the following three: the need to deal with to continue transmission, loaded on the localwavelength transmission out directly to the wavelength downloads. Metro reconfigurable optical add-dropmultiplexer used in a large part of the wavelength locking this ROADM that need to be transmittedwavelength can be easily locked[1].Wavelength locker has some limitations, this technique all possiblerouting lines loaded on the wavelength, then the unwanted channels will be blocked. Solve this problemcan be locked multiple-wavelength cascaded combination together, but this will consume wavelengthalmost all of the power, then you must use the amplifier power level restitution buy amplifier you need tospend more money.ROADM equipment wavelength selective switch in the development of the advantage isobvious: the wavelength switch can achieve arbitrary input and output switching, wavelength bywavelength shifting process, users can download the wavelength and the wavelength of the transferfunction to the local, and when necessarywavelength exchange transfer, free transfer to other loop. Basedon the above, it ROADM using this technology are better able to call wavelength ROADM use of thistechnology to the DWDM system can be greatly enhanced the DWDM networking capability, played a roleto reduce costs[2].The ROADM market place more and more as an integral part of the production process,the demand for WSS also increased a lot. Followed in the production process of WSS detection efficiencyhigher requirements, Therefore, how to better and faster measurement WSS insertion loss, ripple, extinctionratio parameters, must be addressed.Traditional test instrument test speed is slow, tedious process, lowefficiency, high cost, and the requirements of the test, there is a gap.To solve the above problem, the authors analyzed the current WSS test commonly used methods aswell as the insufficient of the popular virtual instruments from the market point of view, a new type ofvirtual test system. The work to be accomplished by the implementation of the test system is divided intoWSS optical parameters to measure the part of the required hardware and software part of participation in this process is the main LabVIEW part, as well as some hardware, so only some of the following hardwareabrief introduction. In the system hardware, the use of fast scan tunable laser light source module, to ensurea fast wavelength, continuous scanning; using a specially designed circuit board to ensure that theparameters in real time, accurate processing;Data acquisition and pre-selection of the digital signalprocessing chip and its accompanying emulator to ensure the accuracy of the data into the computer againafter the completion of the pre-treatment, and the form of a report presented to the user. In the systemsoftware using the LabVIEW development platform and DSP programmable application-specificchips,Constructed for use by the user operating the front panel, the preparation of the test system need toimplement the function of the program, and ultimately the test of the optical parameters of the instrument,analysis instrument in the production process can be used to detect.Short for Laboratory Virtual Instrument Engineering Workbench is LabVIEW is a graphicalprogramming language, has the following characteristics[3]: to create an application icon, replacing theprevious line of text; application created by the icons instead of lines of text, datastreamed programming[4];programming process of the formation of a large number of nodes, the data flow between the nodes, theflow direction of the data flow is the order of execution of virtual instruments and functions.Operation ofLabVIEW, we can choose according to need controls, and then use these controls "arrangement" to useinterface for user operation, also known as the front panel, the appearance of these controls looks like weuse the instrument, soit constitutes a virtual instrument much like our previous operation of the equipment.So that the user can use the icon and connector on the front panel control[5].