![]() ![]() In more specific scenarios, it can also perform polarization tracking and modulation format identification. Furthermore, by exploiting the spectral correlation properties of the modern communication signals, it can also monitor chromatic dispersion (CD), polarization-mode dispersion (PMD), baudrate and timing phase. It is capable of scanning the optical spectrum, measuring the optical power, wavelength, and the optical signal-to-noise ratio (OSNR). Here we show that, by using a pair of lowbandwidth coherent receivers and two local lasers, a multiparameter OPM at the intermediate nodes can be constructed. ![]() However, this is considerably challenging for OPM at the intermediate nodes in consideration of cost efficiency, dynamic range, monitoring accuracy, etc. A more effective network controller requires OPM to monitor multiple parameters in order to perform better network planning. OPM exists either as standalone devices integrated in the intermediate nodes, or it could be a set of algorithms running in devices such as the optical transceivers. OPM measures the states of the physical layer and provides feedback to the network controller for performing tasks such as link diagnosis and fault detection. Optical performance monitoring (OPM) is an important tool to facilitate the management of future optical fiber communication networks. ![]()
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