Abstract
Comprehensive tuning optimization of an integrated optical ring resonator (ORR) based
$1\times 4$
optical beam forming network (OBFN) for W-band millimeter wave (mmW) phased arrays is reported. The OBFN chip is implemented using a ultralow loss silicon nitride technology and a two stage binary tree topology. The delay responses of a single- and multiORR delay line were carefully measured, and the results agree well with a lossless theoretical model. Tuning of an ORR was calibrated and verification experiments were performed to verify the tuning accuracy. A flattened delay response for a 3-ORR delay line was achieved, demonstrating a bandwidth of
$6\ \text{GHz}$
and dynamic tuning range of
$209\ \text{ps}$
, which corresponds to a phase shift of
$33.4\pi$
for an 80-
$\text{GHz}$
signal. A larger bandwidth can be achieved by reducing the dynamic tuning range. The result is promising for high data rate mmW communications with beamforming.
© 2017 IEEE
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