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- Dual MZI-SOA with serial configuration for quadrature phase modulationPublication . Dionísio, Rogério Pais; Reis, Cláudia; Pavlovic, Natasa B.; Nogueira, Rogério; Teixeira, AntónioA novel generation scheme of QPSK format using dual MZI-SOA in serial configuration is presented. The feasibility of 20 Gb/s QPSK signal with coherent detection is experimentally shown.
- Advanced optical modulation and format conversionPublication . Dionísio, Rogério Pais; Teixeira, António; Nogueira, RogérioOver the years, the increased search and exchange of information lead to an increase of traffic intensity in todays optical communication networks. Coherent communications, using the amplitude and phase of the signal, reappears as one of the transmission techniques to increase the spectral efficiency and throughput of optical channels. In this context, this paper present a survey on format conversion of modulated signals using MZI- SOAs, based exclusively on all-optical techniques through wavelength conversion. We also present two proposal using all-optical techniques: One for the conversion of amplitude modulation signals to a continuous phase modulation format, and another technique for the conversion of OOK signals to QPSK and QAM signals. Both approaches are experimentally validated.
- Parametric impairments analysis of all-optical format conversion techniques with a MZI-SOAPublication . Dionísio, Rogério Pais; Nogueira, Rogério; Teixeira, AntónioThis paper proposes a new methodology for the generation of quadrature amplitude modulation signals, based on all-optical processing from nonlinear interferometric devices. The degradation of the systems performance is numerically analyzed, as a function of operational parameter’s unbalance and physical impairments of the system. The results shows that the probe laser power and the coupling factor of optical couplers are the most sensitive parameters of the proposed format conversion system.
- All-optical phase modulation using MZI-SOAPublication . Reis, Cláudia; Dionísio, Rogério Pais; Neto, Berta; André, P.S.; Teixeira, AntónioThis paper experimentally demonstrate an all-optical phase modulation technique using both arms of a Mach-Zehnder interferometer structure with Semiconductor Optical Amplifiers (MZI-SOA), with NRZ modulated signals driven at 10 Gbit/s. The proposed optical phase modulator can be used in multi-level modulation signals generation, as an optical routing element, as well in optical code division multiple access transmission systems.