UNIQUE APPROACH TO ANALOG SIGNAL PROCESSING
Data Signals Intelligence
The Data Age is Here
Who We Are
We started as a team of curious innovators working from an academic basement with the goal of co-design and optimization between fabrication, systems, and software to solve next generation communications challenges. Our team includes leading signal processing pioneers, photonics researchers, and semiconductor industry veterans.
Advanced 3D Photonics
GXC’s photonics platform features the highest delay efficiency which enables long ultra-low loss integrated delays, high Q ring resonators, and large interferometric MZI meshes. Our planar waveguides with ultra-low optical propagation loss enable a plethora of passive photonic integrated circuits, such as splitters and combiners, filters, delay lines, and components for advanced modulation formats. We’ve designed the waveguides to utilize thin high-aspect ratio silicon nitride to minimize sidewall scattering and provide a dilute optical mode that can support very high waveguide intensities without inducing optical nonlinearities.
We overcome the tradeoff between propagation loss and device footprint through our monolithic integration of ultra-low loss Si3N4 with crystalline silicon. Key to 3D integration of photonic waveguides is the highly efficient vertical couplers. The couplers allow two waveguides to be combined on a single platform. This in turn enables complex and efficient photonic devices, leveraging the ultra-low loss and high-power handling capabilities of Si3N4 waveguides while utilizing Si for compact routing and fast and efficient phase shifters.
High Q Integrated Resonators
Integrated optical resonators are key building blocks for an ever-increasing range of applications including optical communications, sensing, and navigation. A challenge to today’s photonics integration is realizing circuits and functions that require ultralow loss waveguides on-chip while balancing the waveguide loss with device function and footprint. GXC’s advanced 3D photonics enable very high loaded Q resonators which require very low propagation loss enabled by Si3N4 waveguides.
Additionally, monolithic integration with crystalline silicon waveguides enable complex integration with a wide variety of previously demonstrated active components developed in silicon and SiGe such as modulators, fast switches, and detectors.
Full duplex is the simultaneous use of adjacent and overlapping frequency bands for both transmit and receive signals. This has the potential of fully utilizing valuable RF spectrum. However, the co-location of the transmit and receive circuitry inside a transceiver node enables the transmit signal to leak into the receive path which buries the desired signal and saturates receiver circuitry such as the low noise amplifier (LNA) and analog to digital converter (ADC).
Since the TX and RX signals utilize the same frequency, spectral filters do not help. Cancellation of this self-interference is a key technology in realizing 5G data rates and capabilities. Upconverting radio frequency (RF) signals to the optical domain for signal processing in a microwave photonic filter allows for support of large bandwidth due to the fractional bandwidth of the RF signals (MHz to GHz) relative to the optical carrier (THz).
GXC has developed a novel photonic integrated circuit for fine control of both signal amplitude and phase which enables large cancellation depths. This strategy benefits from other notable advantages inherent in all photonic systems including robustness against electromagnetic interference (EMI), compatibility with all modulation formats, and reduced SWaP (size, weight, and power).
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