Abstract
A new photonic microwave phase shifting structure that can realize a continuous 0° to 360°
phase shift with only little frequency dependent amplitude and phase variation over a wide
frequency range is presented. It is based on controlling the amplitude and phase of the optical
carrier and two antiphase RF modulation sidebands of two phase modulated optical signals by
adjusting the wavelength of the optical carriers that fall on the rising and falling edges of an
optical bandpass filter with a nonlinear phase response. The new photonic microwave phase shifter
has a simple structure. It only requires one normal electro-optic phase modulator and one low-cost
commercially available optical filter. It does not involve any electrical component, and has the
advantages of small size, lightweight, and robust performance. Experimental results are presented
which demonstrate the realization of a continuous 0
$^{\circ}$
to 360
$^{\circ}$
phase shift, with close to flat phase and amplitude response performance over a
wideband microwave range.
© 2013 IEEE
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