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1.06-µm Single-Photon-Counting APD

Princeton Lightwave
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CRANBURY, N.J., Jan. 4, 2007 -- Princeton Lightwave Inc. (PLI), a provider of semiconductor lasers and detectors for optical communications, instrumentation and defense applications, has introduced an indium-phosphide single-photon-counting avalanche photodiode (SPAD) designed for optimum performance at 1.06 µm.

The PLI 1.06-µm SPAD bridges the performance gap between silicon and conventional indium-phosphide devices, PLI said. Silicon, which reaches its maximum responsivity below 1 µm, suffers from very low detection efficiency at 1.06 µm.

"Conventional indium phosphide SPADs, with a responsivity peak at 1.55 µm, have excellent detection efficiency, but the excess noise generated by the unused spectrum increases the dark count rate at 1.06 µm," the company said in a statement.

The device combines an adjustment in the spectral peak through material engineering with single-photon capabilities stemming from PLI's prior designs for longer wavelengths. The result is a SPAD with peak responsivity at 1.06 µm that enables very low dark-count rates while providing a larger detection efficiency -- by an order of magnitude, compared to silicon, PLI said.

The PLI 1.06-µm SPAD is available in 80 and 200 µm, packaged with a thermoelectric cooler inside a windowed TO-8 can. The low dark-count rate allows operations in either gated or nongated mode. A detection efficiency of 50 percent is achievable.

Applications include low-light YAG laser detection and time-resolved spectroscopy in biomedical, lidar and ladar systems designed for remote sensing and for free-space optical transmission.

For more information, visit:; e-mail:

Princeton Lightwave Inc.
2555 US Route 130 S.
Cranbury, NJ 08512
Phone: (609) 495-2600
Fax: (609) 395-9114
Jan 2007
APDBiophotonicsCommunicationsdefensedetectionindium phosphideLADARlidarnanooptical communicationsphotonicsPLIPrinceton LightwaveProductsremote sensingsemiconductor lasersSensors & Detectorssiliconsingle-photonSPADspectroscopyYAGlasers

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