NFAD Arrays for Single Photon Optical Communications at 1.5 um

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$599,796.00
Award Year:
2011
Program:
SBIR
Phase:
Phase II
Contract:
NNX11CB10C
Award Id:
n/a
Agency Tracking Number:
094313
Solicitation Year:
2009
Solicitation Topic Code:
O1.06
Solicitation Number:
n/a
Small Business Information
NJ, Cranbury, NJ, 08512-3509
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
170161595
Principal Investigator:
MarkItzler
Principal Investigator
(609) 495-2551
mitzler@princetonlightwave.com
Business Contact:
MarkItzler
Chief Technical Officer
(609) 495-2551
mitzler@princetonlightwave.com
Research Institute:
Stub




Abstract
For this program, we propose to develop large pixel-count single photon counting detector arrays suitable for deployment in spacecraft terminal receivers supporting long-range laser communication systems at 1.5 um. To surmount the present obstacles to higher photon counting rate -- as well as the complexity of back-end circuitry required -- in using conventional single photon avalanche diodes (SPADs), we will leverage initial success in monolithically integrating "negative feedback" elements with state-of-the-art SPADs to beneficially modify the device avalanche dynamics. This approach can achieve extremely consistent passive quenching, and appropriate implementations can lead to rather small avalanches (e.g., ~10^4?10^5 carriers), for which reduced carrier trapping provides lower afterpulsing that will no longer limit the photon counting rate. When correctly implemented, this "negative feedback" avalanche diode (NFAD) design is also extremely simple to operate: with just a fixed dc bias voltage, the NFAD will autonomously execute the entire arm, avalanche, quench, and re-arm cycle and generate an output pulse every time an avalanche event is induced. During Phase 1 of this program, we characterized 5 different discrete NFAD designs to identify specific pixel-level design opportunities for reducing afterpulsing and timing jitter. We also fabricated and characterized wafer-level test structures that show excellent feedback element yield and uniformity sufficient for large-format NFAD arrays. These proofs-of-feasibility from Phase 1 position us to demonstrate space-qualifiable large pixel-count 128 x 128 NFAD arrays during a Phase 2 effort. This effort will also include the development of appropriate test platforms for NFAD array packaging and characterization.

* information listed above is at the time of submission.

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