This paper will discuss mission requirements and possible architectures of optical fibre network for the distribution of Master Local Oscillator (MLO) signals to multiple RF input ports on-board Satellite payloads. With that purpose, each of the MLO signals is modulated onto a different CW optical carrier in order to be distributed and power is equally split into multiple fibre paths while in the optical domain. The MLO signals to be delivered can be either lower power digital signals as well as high power analogue signals (> 0 dBm), and/or a combination of both, in the frequency range between 1 GHz and 20 GHz.
The novel contribution of this paper is the comparison of two architectures whose main distinction is a different number of amplifiers against the required RF ports. This in turn defines the optimum way for optical amplification implementation in the optical signal distribution network. The trade-off shows that for the high number of MLOs and smaller number (<32) of RF output ports the wavelength division multiplexing (WDM) before optical amplification is preferred, while for the low MLO number and high number (>100) of RF ports distribution network the high power highly efficient optical power amplification is more beneficial. These two types of networks are compared focusing on the DC power consumption of all the equipment and the flexibility to accommodate them onto the Spacecraft.
Pulsed dynamics are rigorously studied in coupled silicon photonic crystal cavity-waveguide nanostructures by developing a computational model based on coupled-mode theory, which describes cavity-waveguide coupling effects, key nonlinear interactions, such as the Kerr effect, two-photon-absorption, free-carrier (FC) dispersion and FC absorption, as well as waveguide dispersion effects. Propagation of optical pulses in a photonic system consisting of two photonic crystal cavities coupled to a photonic crystal waveguide operating in the slow-light regime is analyzed. Moreover, the influence of different parameters on pulse dynamics is investigated, including the separation between cavities, the distance between the cavities and the waveguide, and the input pulse width.
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