Ph.D. in physics, electrical engineering (EE), or electrical and computer engineering (ECE) with dissertation work encompassing III-V compound semiconductor device design, fabrication, and characterization; non-Ph.D. applicants with equivalent experience will be considered. Experience in device packaging, detector hybridization, and high-speed circuit design is a major plus, as is specific experience with photodiode design and characterization. The successful applicant will work closely with another Ph.D. who specializes in photodiode design and epitaxial layer growth; a complementary skill set with greater emphasis on wafer processing, device characterization, and circuit applications would be ideal, but knowledge of semiconductor device physics and optoelectronic design is required. A motivated, self-directed individual is desired, with good written and verbal communication skills and the ability to plan and manage research projects.
Responsibilities
The successful applicant will be responsible for the design, planning, and execution of photodiode manufacturing processes run at foundry partners. This includes photomask layout, process specification, and foundry interface. Other responsibilities include working with foundry partners to develop packaging and hybridization processes, management of photoreceiver circuit development by in-house electrical engineers, and oversight of Voxtel’s in-house device testing personnel. The successful applicant will be responsible for coordinating the design interface between photodiodes and receiver circuitry, and will be expected to assist test engineers in designing experiments and interpreting device characterization data. Lastly, the successful applicant will be expected to participate in business development and program management activities, including authorship of technical proposals and reports, customer interface, and planning and deploying company resources to meet customer goals.
March 15, 2010 — Beaverton, Ore. — Voxtel has announced the release of an avalanche photodiode (APD) receiver with 1-gigahertz bandwidth and a large 200-μm-diameter optical area. The company believes it to be the highest-bandwidth large-area NIR APD receiver, which makes it optimal for a broad range of laser rangefinders and laser designators, and for applications in free-space optical communications, optical instrumentation, and LADAR/LIDAR.
The model RIP1-NJAC APD photoreceiver is the latest entry in Voxtel’s Siletz™ line of single-carrier multiplication avalanche photodiode (SCM-APD) products. The receiver integrates the low-excess-noise SCM-APD with a low-noise transimpedance amplifier (TIA). Voxtel’s Siletz™ SCM-APDs are the lowest-excess-noise NIR–SWIR APDs available (with an equivalent ionization coefficient keff < 0.02), and allow for the receiver to operate at high avalanche gain, boosting the optical signal over the amplifier noise level without the degrading effects of avalanche-induced excess noise. The ultra-low excess noise and high gain make the RIP1-NJAC the most sensitive photoreceiver available on the market, offering a maximum responsivity over 50 A/W at 1550 nm, with operating gain up to 50.
A single-stage thermoelectric (TE) cooler is included to eliminate temperature-induced gain variation and allow optimal performance over the range of application environments. The receiver is available with an optional fiber pigtail.
The product is immediately available for sale.
About Voxtel
Voxtel, Inc. of Beaverton, Ore. is a provider of optoelectronic devices using novel semiconductor architectures and engineered nanostructured materials, and a leading developer of sophisticated detectors and electro-optical imaging systems for a wide range of government, industrial, and scientific markets. Voxtel’s product technologies include near-infrared laser radar (LADAR) receivers, radiation-hardened imagers for space applications, highly sensitive avalanche photodiodes for fiber and free-space telecommunications, and nanotechnology-engineered materials. For more information, visit Voxtel’s homepage.
]]>February 15, 2010 — Beaverton, Ore. — Voxtel has announced the release of its latest product line, the Deschutes BSI™ series of back-side-illuminated APDs.
The Deschutes BSI™ APDs are available on ceramic submounts, with a co-mounted temperature sensor. Compared to front-side-illuminated APDs, they offer superior responsivity and lower capacitance. Deschutes BSI™ APDs offer typical responsivity greater than 1.0 A/W at 1550 nm and 0.73 A/W at 1064 nm, and operating gain from 3 to 20. These InGaAs/InAlAs APDs have been custom-designed for low excess noise, with a design exploiting the non-local behavior of impact ionization. The resulting APDs, which are characterized by an equivalent ionization coefficient of keff < 0.2, have 40% less excess noise than conventional telecom InGaAs/InP APDs, which makes them ideal for optical communications, laser radar (LADAR) and LIDAR, and laser rangefinding/designating applications. Configured for low capacitance, the parts are well suited for high-bandwidth applications. The Deschutes BSI™ model series VFC-1000 is available in 30-, 75-, and 200-μm-diameter versions; it is available on submounts, in hermetic packages with optional thermoelectric cooling, and packaged into photoreceivers. All packaged versions are available with optional fiber pigtails.
The product is immediately available for sale.
About Voxtel
Voxtel, Inc. of Beaverton, Ore. is a provider of optoelectronic devices using novel semiconductor architectures and engineered nanostructured materials, and a leading developer of sophisticated detectors and electro-optical imaging systems for a wide range of government, industrial, and scientific markets. Voxtel’s product technologies include near-infrared laser radar (LADAR) receivers, radiation-hardened imagers for space applications, highly sensitive avalanche photodiodes for fiber and free-space telecommunications, and nanotechnology-engineered materials. For more information, visit Voxtel’s homepage.
]]>Just as important as Voxtel’s cost leadership is our product quality: Voxtel’s process is not only much more cost-effective than past synthesis methods, but also makes a higher-quality product with less size dispersity. Combined with our ability to provide most of our products using environmentally friendly materials, Voxtel has a clear advantage in quality, price, and ease of use.
]]>May 11, 2009 – Beaverton, Oregon – Voxtel has announced the release of its ‘Siletz’ series of APD receivers, responding to the demand for eye-safe and highly sensitive optical communications, LIDAR, and LADAR in the near infrared (NIR) spectrum. Voxtel’s Siletz APD receiver optical subassembly provides sensitivity 2 to 4 dBm improved over any other APD receiver currently available on the market covering the 950–1700 nm spectral range, and operates at frequencies up to 2.7 GHz.
Voxtel’s Siletz receiver series is based on its patented single carrier multiplication InGaAs APD (SCM-APD). The SCM-APD provides higher gain (M > 50) and lower excess noise (F(M) ~ 2) than conventional APDs. The higher gain and lower avalanche noise of the SCM-APD provides amplification of the NIR optical signal over the amplifier noise floor, providing better than –44 dBm noise equivalent power (NEP) and superior bit error rate (BER) performance over the entire frequency range. The SCM-APDs provide 2x better temperature stability compared to conventional APDs, reducing demands on bias stabilization and temperature compensation.
The REP-1XJ0A model Siletz receiver is packaged in a hermetic TO-8 package with a thermoelectric cooler (TEC). The TEC provides the ability to stabilize the APD temperature, easing the system integration effort. The APD receiver is available with the option for single- and multi-mode fiber tails.
Voxtel’s SCM-APD receiver is a high-performance product not yet available from any other manufacturer.
About Voxtel
Voxtel, Inc. of Beaverton, Ore. is a provider of devices using novel semiconductor architectures and engineered nanostructured materials, and a leading developer of sophisticated detectors and electro-optical imaging systems for a wide range of government, industrial, and scientific markets. Their product technologies include near-infrared laser radar (LADAR) receivers, radiation-hardened imagers for space applications, highly sensitive avalanche photodiodes for fiber and free-space telecommunications, and nanotechnology-engineered materials. For more information, visit Voxtel’s homepage.
]]>February 16, 2009 – Beaverton, Oregon – Voxtel Incorporated announces a new class of near-infrared photodetectors: single carrier multiplication APDs (SCM-APDs). SCM-APDs are nanostructured indium gallium arsenide/indium aluminum arsenide (InGaAs/ InAlAs) devices that have been designed to overcome the limitations of conventional avalanche photodiodes (APDs) in the 0.9 to 1.6 micron spectral region, including the eye-safe range beyond 1.3 microns. These new photodetectors exceed the capabilities of APDs in both gain and noise performance. With their high gain and low noise, combined with high quantum efficiency, Voxtel’s SCM-APDs are ideal for low-light-level detection, or any other applications that call for industry-leading sensitivity in the near-infrared spectral band. Coupling the SCM-APD to a low-noise amplifier produces a receiver with high gain, superior noise equivalent power, and better overall sensitivity. The SCM-APD operating bias has low temperature sensitivity compared to APDs, making it easier and more cost-effective to integrate SCM-APDs into systems and laboratory instrumentation.
In the past, APDs have been used by designers of LIDAR, telecommunications, and other active optical systems to boost the photosignal above downstream electronics noise. However, the benefits of conventional APDs are restricted by their limited useful amplification — typically less than 15x — and the noise that the avalanche gain process adds to the signal. Voxtel’s SCM-APDs are engineered for operation at high gain with low noise, allowing for active optical systems with better sensitivity, longer range, and lower laser power.
Featuring ultra-low-noise analog optical detection up to approximately 1 GHz, Voxtel’s new Siletz series of SCM-APDs have very low effective ionization coefficients (k ~ 0.02), and can be operated with low excess noise: F(M) ~ 2 up to gain M = 50. The maximum linear-mode gain of Siletz SCM-APDs is typically above M = 100. By contrast, standard telecom NIR APDs are generally not useful above M = 15, and carry a much greater noise penalty (k = 0.4; F(M) > 7 at M = 15).
Other applications for the new near-infrared SCM-APD include quantum cryptography, optical time domain reflectometry, near-infrared Raman spectroscopy, biomedical NIR spectroscopy, time-resolved emission detection for failure analysis, and singlet oxygen detection.
Voxtel is a global supplier of optoelectronic and nanophotonic products for industrial, commercial, military, agricultural and biomedical markets. For additional information on SCM-APD detectors, photon counting detectors, and laser radar sub-systems, visit Voxtel’s homepage at www.voxtel-inc.com.
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