Hybrid Receiver for Optical Wireless Communication
A hybrid optical wireless communication (OWC) receiver combining the near-quantum sensitivity of a single photon avalanche diode (SPAD) array and the classical operating performance of a linear photodiode (LPD). The device enables OWC with a single receiver in scenarios requiring a highly extended dynamic range.
- Wireless backhaul
- Visible Light Communication
- Underwater optical communication
- Prototype in development
- UK priority patent application
- Licensing and/or co-development
With limitations in radio frequency spectrum and technologies increasingly representing a bottleneck for the expansion of wireless communication networks, OWC has attracted significant interest due to its potential advantages such as high data rate, and licence-free spectrum – both in terms of outdoor Free Space Optics (FSO) and indoor Visible Light Communication (VLC). The nature of OWC means that signals may vary significantly including to very low levels which would be below the threshold of conventional optical receivers (e.g. due to adverse weather conditions in FSO or blockage / dimming in VLC). There remains an unmet need for effective OWC receivers which can operate consistently across such an extended dynamic range.
Edinburgh researchers have developed a hybrid OWC receiver that is capable of transitioning from sensitivity levels of classical (e.g., thousand photons per bit) to near-quantum regimes (e.g., ten photons per bit). This is achieved by combining the capabilities of an array of single photon avalanche photodiodes (SPADs) and conventional photodetectors operating in linear mode (LPD), e.g., pin diode. Notably, the technology incorporates an approach to overcome the inherent operating gap that exists between SPAD array detectors and LPDs in high-speed applications, resulting in a system which provides reliable and smooth operation over a very large dynamic range of incident light intensity.
- Hybrid sensitivity spanning large dynamic range
- Effective for high speed optical communication
- Continuous operation under low and variable signal levels
- Huang and M. Safari, “Hybrid SPAD/PD Receiver for Reliable Free-Space Optical Communication,” IEEE Open Journal of the Communications 10.1109/OJCOMS.2020.3023009.
Edinburgh Innovations Ltd
The University of Edinburgh
+44 (0)131 650 9090