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- Experimental study of a phase modulator using an active interferometric devicePublication . Dionísio, Rogério Pais; Reis, Cláudia; André, P.S.; Nogueira, Rogério; Teixeira, AntónioA novel architecture for an optical phase modulator is presented and experimentally demonstrated. This approach relies on a commercially available integrated Mach- Zehnder interferometer structure with Semiconductor Optical Amplifiers (MZI-SOA) and it is based in cross-phase modulation effect (XPM). The feasibility of the proposed optical phase modulator is experimentally investigated using different scenarios of input power and bit rates.
- 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.
- 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.
- Enhanced optical gain clamping for upstream packet based traffic on hybrid WDM/TDM-PON using fiber bragg gratingPublication . Neto, Berta; Klingler, A.; Reis, Cláudia; Dionísio, Rogério Pais; Nogueira, Rogério; Teixeira, António; André, P.S.In this paper, we propose a method to mitigate the temporal power transients arising from Erbium doped fiber amplifiers (EDFAs) on packeted/bursty scenario. The technique, applicable on hybrid WDM/TDM-PON for extended reach, is based on a low power clamping provided by a distributed feedback (DFB) laser and a fiber Bragg grating (FBG). An mprovement in the data signal Q factor was achieved keeping the clamping control signal with a low power, accompanied by a maximum reduction in the gain excursion of 1.12 dB