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9 March 2020 Extension of matched optical filtering to scalable multi-channel high-sensitivity photon-counting applications (Conference Presentation)
Katia Shtyrkova, Igor Gaschits, David O. Caplan
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Proceedings Volume 11272, Free-Space Laser Communications XXXII; 112720S (2020) https://doi.org/10.1117/12.2550003
Event: SPIE LASE, 2020, San Francisco, California, United States
Abstract
We present WDM-scalable low-loss and narrow-bandwidth optical filtering techniques for high-sensitivity photon-counting applications. A cascaded approach using two filtering elements is leveraged that can efficiently receive multi-spatial-mode WDM optical signals through the turbulent free-space optical channel: a periodic narrowband background-rejection filter in which each passband can be well matched to the incoming transmitter waveform; and a WDM separation filter that distributes received WDM channels to detection elements within a receiver array. This combination enables large-constellation modulation options with improved sensitivity and provides a scalable high-performance optical-filtering solution that is particularly attractive for bandwidth-constrained photon-counting applications.
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Katia Shtyrkova, Igor Gaschits, and David O. Caplan "Extension of matched optical filtering to scalable multi-channel high-sensitivity photon-counting applications (Conference Presentation)", Proc. SPIE 11272, Free-Space Laser Communications XXXII, 112720S (9 March 2020); https://doi.org/10.1117/12.2550003
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KEYWORDS
Optical filters
Wavelength division multiplexing
Electronic filtering
Receivers
Channel projecting optics
Chemical elements
Free space optics
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