Abstract
In recent years, an approach of photonic true-time delay (TTD) unit which employs a linear chirped fiber grating (LCFG) and a tunable multi-wavelength laser (TMWL) for phased array antennas (PAAs) has been reported. In this paper, several key parameters of the LCFG and TMWL are analyzed. The beam-pointing resolution is effected by the parameters including the group delay slope of LCFG, the tuning accuracy of the wavelength spacing of TMWL. The relationship between the beam-pointing angle and the wavelength spacing of TMWL is an inverse trigonometric function. So linear output of the beam-pointing angle could be obtained by tuning the wavelength spacing as sine function. Furthermore, the relationship of the beam-pointing resolution and the beam-pointing angle with different tuning accuracies of the wavelength spacing of TMWL and different group delay slopes of LCFG are also analyzed.
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