Coherent Receiver Dynamic Stress Testing with the AWG
应用文章
Introduction
The latest development in high-speed arbitrary waveform generators (AWG) offers sampling rates which enable to directly synthesize and generate complex modulated baseband signals with highest data rates, driving E/O converters and generating a true optical transmission channel with 256 Gb/s and beyond. This technique not only allows to flexibly switch data rates and transmission formats for coherent transmission testing but also allows to emulate optical signal properties and impairments which occur in a real optical fiber network, such as polarization rotation, polarization mode dispersion (PMD) or carrier phase noise.
In traditional coherent receiver stress testing using an optical fiber test bed, signal impairments are generated optically. Testing is subject to numerous stochastic processes where it is difficult to deterministically and repeatedly generate stress conditions1 . However, with an AWG this can be accomplished and test coverage can be increased at reduced test time (see Figure 1).