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Characterization of Photon-Counting Detector Responsivity for Non-Linear Two-Photon Absorption ProcessSub-band absorption at 1550 nm has been demonstrated and characterized on silicon Geiger mode detectors which normally would be expected to have no response at this wavelength. We compare responsivity measurements to singlephoton absorption for wavelengths slightly above the bandgap wavelength of silicon (approx. 1100 microns). One application for this low efficiency sub-band absorption is in deep space optical communication systems where it is desirable to track a 1030 nm uplink beacon on the same flight terminal detector array that monitors a 1550 nm downlink signal for pointingcontrol. The currently observed absorption at 1550 nm provides 60-70 dB of isolation compared to the response at 1064 nm, which is desirable to avoid saturation of the detector by scattered light from the downlink laser.
Document ID
20150005771
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Sburlan, S. E.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Farr, W. H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
April 16, 2015
Publication Date
April 9, 2011
Subject Category
Communications And Radar
Meeting Information
Meeting: FORMOSAT-3/COSMIC Data Users Workshop 2011
Location: Taipei
Country: Taiwan, Province of China
Start Date: April 9, 2011
End Date: April 17, 2011
Sponsors: National Space Organization
Distribution Limits
Public
Copyright
Other
Keywords
Geiger mode detector
pixels
responsivity
two-photon
optical communications
detection efficiency
non-linear absorption
microlens array

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