Optical Computing for Digital Signal Process in Incoherent Fiber System Using Positive Realization
We discuss an optical digital signal process in incoherent optical fiber system. Due to the strong dependence on environmental fluctuations, stable photonic filters are difficult to implement under coherent operation. We pay attention to a stable robust technique operating in incoherent optical domain. Most of coefficients of filters working under incoherent optical domain are positive. Finding a realization of an optimal digital filter under positive constraints is known as an open and difficult problem. We propose a novel constructive method to implement optical digital filter using the sparse positive realization with possible lower order in the incoherent optical domain.
KeywordsOptical computing Photonic filter Optical fiber Incoherent domain Positive system Positive realization Optical networks
This research was supported by the MKE (The Ministry of Knowledge Economy), Korea, under the Support industry-university cooperation Specialization program (NIPA-2012-H0803-13-1004) supervised by the NIPA (National IT Industry Promotion Agency).