This project is within the optical communication networks area. In particular, in the area that studies the physical constraints in optical networks.

One of the most severe limitations in the network physical layer is crosstalk. This phenomenon has its origin, primarily, in the imperfect isolation of optical components, such as optical switches, multiplexers, and demultiplexers, that are key components in the design of an optical node. The type of crosstalk that causes the higher degradation to the system performance is the in-band crosstalk, in which the interfering (crosstalk) signals and the selected signal, despite coming from distinct optical sources, have the same nominal wavelength.

The main objectives of this project are:
* Develop a formalism to evaluate the impact of in-band crosstalk in optical DQPSK systems.
* Evaluate the impact of in-band crosstalk in a DPSK and DQPSK systems when the signal propagates through an optical network. Each optical node is formed by an optical switching architecture, optical amplifiers, optical filters, and possibly wavelength converters.
* Implement Monte Carlo (MC) simulation to study the impact of ASE noise and in-band crosstalk on the performance of DPSK and DQPSK systems and confirm the analytical results.
* Implement the multicanonical Monte Carlo (MMC) method to simulate the tails of the probability density function of the decision variable and to obtain lower values of the bit error rate (BER) than in the MC standard procedure.
* Evaluate by simulation the impact of in-band crosstalk in optical networks with DPSK and DQPSK signals, for a rigorous model of the optical node and validate the analytical tool developed for this case.

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