Photonics-based communication systems can provide increasing data rates to meet the users’ requirements. Coherent optical communication system was implemented to satisfy the current and future applications, in which the transmission of optical signal over two polarizations can mainly achieve a double Baud rate as compared to a s ingle polarization. However, dual polarization systems have some hindrances whichare represented by polarization rotation, polarization-dependent loss (PDL), and polarization mode dispersion (PMD). In this paper, those impairments are demonstrated and investigated for either a single component or multiple components in the optical system. The theoretical and mathematical discussions reveal that the polarization rotation and PDL can cause a loss in the optical signal power and loss in the orthogonality between two polarization tributaries. Furthermore, simulations are carried out for 10 GBaud dual-polarization-quadrature phase shift keying (DP-QPSK) as an example of optical application. The simulation measurements in term of bit-error-rate (BER) show how the polarization impairments can significantly degrade the system performance.
Microwave imaging systems allowing the real-time scanning of short-range objects are difficult to implement on a large scale due to their complexity and cost. In this paper we introduce a new ultra-wideband multiple-input multiple-output radar using microwave photonic components in reception. These components permit ultra-fast time division multiplexing of all receiving signals and hence their measurement with a single acquisition channel. This architecture makes possible to decrease the time of acquisition compare to architecture with a sequential reception.
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