Abstract
An experimental prototype is presented that illustrates the
implementation aspects and feasibility of the novel ring resonator-based
optical beamformer concept that has been developed and analyzed in Part I of
this paper . This concept can be used for seamless control of the
reception angle in broadband wireless receivers employing a large phased
array antenna (PAA). The design, fabrication, and characterization of a
dedicated chip are described, in which an 8$\,\times\,$1 optical beamforming network, an optical sideband filter for
single-sideband suppressed carrier modulation, and a carrier re-insertion
coupler for balanced optical detection are integrated. The chip was designed
for satellite television reception using a broadband PAA, and was realized
in a low-loss, CMOS-compatible optical waveguide technology. Tuning is
performed thermo-optically, with a switching time of 1 ms. Group delay
response and power response measurements show the correct operation of the
OBFN and OSBF, respectively. Measurements on a complete beamformer prototype
(including the electro-optical and opto-electrical conversions) demonstrate
an optical sideband suppression of 25 dB, RF-to-RF delay generation up to
0.63 ns with a phase accuracy better than $\pi/10$ radians, and coherent combining of four RF input signals, all in
a frequency range of 1–2 GHz.
© 2009 IEEE
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