Abstract
As mobile beam-bandwidth-product requirements accelerate, millimeter-wave (mmW) bands have been opened to telecommunications networks to enable wider channel bandwidths, while Massive Multiple-Input Multiple-Output (mMIMO) technology has been implemented to concurrently address multiple devices at the same frequency from a single base station. Such space-division multiplexing can be combined with spectral multiplexing to enable a very large number of concurrent users, but currently is implemented through computationally intensive digital beamforming networks. We show that a radio-frequency (RF) photonic receiver system, previously shown to be capable of sorting signals into respective spatial-spectral ‘bins’ is further capable, through an injection-locked tunable optical local oscillator (TOLO), of recovering the data upon each signal in the RF scene. The TOLO is combined in free-space with an up-converted optical sideband and the combined optical field impinges upon an array of photodetectors, each corresponding to separate points in k-space, defined by unique combinations of angle-of-arrival (AoA) and carrier frequency. Using this free-space LO insertion, we demonstrate simultaneous recovery of multiple spatially co-located data streams with resilience to interference.
Highlights
M OBILE subscriptions have eclipsed the global population and are projected to continue increasing at a linear rate for at least the five years [1] with the rise of fifth-generation wireless technology (5G)
While previously published work has demonstrated the capability of a fiber-based arrayed waveguide grating (FAWG) in this application to introduce spectral dispersion at the image plane of the Fourier optical processor for the purpose of cueing detection [20], in this paper we demonstrate the capability of the spatial-spectral channelizing imager to perform signal recovery
A laser source is fed into an optical fiber network allowing for the simultaneous distribution of the carrier to 30 up-conversion modules, each consisting of a linear tapered slot antenna (LTSA) followed by a low-noise amplifier (LNA) serving as the signal input into a phase modulator
Summary
M OBILE subscriptions have eclipsed the global population and are projected to continue increasing at a linear rate for at least the five years [1] with the rise of fifth-generation wireless technology (5G). While previously published work has demonstrated the capability of a fiber-based arrayed waveguide grating (FAWG) in this application to introduce spectral dispersion at the image plane of the Fourier optical processor for the purpose of cueing detection [20], in this paper we demonstrate the capability of the spatial-spectral channelizing imager to perform signal recovery. This capability is enabled through the use of a tunable optical local oscillator (TOLO) which is injection locked to a modulation sideband of the ‘master’ laser supplying the array of up-conversion modules.
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