Agilent Technologies today introduced the industry's first system impairments analysis for chromatic dispersion (CD) and first-order polarization mode dispersion (PMD) with the N4391A optical modulation analyzer. The new tools allow system engineers, for the first time, the ability to characterize distortions of constellation diagrams caused by the CD or PMD of an optical link. Agilent will demonstrate the new tools, together with a 224 Gb/s transmitter (courtesy of the University of Karlsruhe, Germany), at OFC/NFOEC 2010, March 23-25, 2010, San Diego, Calif., Booth 1515.
The N4391A optical modulation analyzer offers comprehensive tools to analyze and quantify the signal integrity of a vector modulated signal (e.g., error vector magnitude and quadrature error). The N4391A is the first optical modulation analyzer offering measurement and compensation of the link's CD and first order PMD by analyzing the received signals, offering engineers deep-insight into the root cause of constellation distortions The CD and PMD compensation helps system researchers and engineers to quantify their signal quality along the link and down to the receiver input. This is accomplished by correcting for CD and PMD distortions in the constellation diagram and displaying CD and first order PMD values in the status line of the N4391A.
In order to offer the highest flexibility to the user, the raw digitized data coming from the N4391A's optical coherent receiver can be processed using Microsoft's .NET(r) framework and included as a user-provided library. For greater flexibility of data analysis, customers can include their algorithms in the burst-mode processing system of the N4391A. The N4391A can handle any number of user algorithms in a user-selectable sequence.
Our optical modulation analyzer provides the highest flexibility of analysis tools for advanced research of next-generation optical transmission systems, said Juergen Beck, general manager of Agilent's Digital Photonic Test business. The addition of CD and PMD analysis offers system test engineers a powerful tool for transmission system characterization with the option to include user-developed processing algorithms.
At OFC 2010, Agilent will show a live demonstration of the N4931A's new features on a 224 Gb/s transmission system operating with dual polarization and 16 QAM at a symbol rate of 28 GBaud.