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Fig. 4: Automated tests can be accomplished by connecting to the OUI or by connecting directly to the MATLAB workspace. zing the use of a capital investment. For instance, when a project requiring four 70 GHz channels comes to an end, a lab has the ability to easily redeploy the oscilloscopes to other labs. A four-unit configuration can be divided in half to create two systems or further subdivided into single-unit stand-alone instruments by simply removing UltraSync cables, allowing four projects to each use one instrument. The ATI system-based dual-polarization 400G system described above is built up from four individual instruments tied to a common 12.5 GHz sample clock via Ultra-Sync. Each of the four instruments can be operated as a complete stand-alone oscilloscope without any other hardware required. This provides the ultimate flexibility when it comes time to re-deploy the instruments from the original lab to another. Other multi-instrument oscilloscope architectures employ a master control instrument controlling multiple acquisition instruments. The drawback to this approach is that the acquisition instruments cannot be used on their own. Separating this system into individual oscilloscopes without investing in additional control hardware is simply not possible. Analysis for conclusive evaluation Test and measurement coherent receivers typically come with analysis and visualization software. However, it is not uncommon for designers or researchers to need a particular type of measurement or visualization that is not present in the software from the coherent receiver manufacturer. Or, for example, perhaps the researcher is evaluating the quality of a new phase recovery algorithm. The ideal optical modulation analysis software will provide not only the basic building blocks for measurements, but also allow complete customization of the signal processing. The Tektronix OM1106 software for example provides a complete applica¬tions programmatic interface (API) to these algorithms. Using these APIs to provide a substantial feature set is the OM Series User Interface (OUI). The OUI provides a complete coherent optical tool suite allowing any user to conduct detailed analysis of complex modulated optical signals without requiring any knowledge of MATLAB, analysis algorithms, or software programming. PCB Prototypes & Small Series PCB Manufacturing from 8 hours FREE SMT stencil with EVERY Prototype order! sales@pcb-pool.com www.pcb-pool.com PCB-POOL® is a registered trademark of Beta LAYOUT GmbH www.electronics-eetimes.com Electronic Engineering Times Europe May 2015 31


EETE MAY 2015
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