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Temperature Control of Avalanche Photodiode Using Thermoelectric Cooler
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In this article, a proportional integral temperature controller for APDs using a Thermoelectric Cooler (TEC) is discussed. But the controller is compact and can successfully cool the APD to almost 0 degrees C in an ambient temperature environment of up to 27 percent C.Abstract:
Avalanche photodiode (APDs) are quantum optical detectors that are used for visible and near infrared optical detection applications. Although APDs are compact, rugged, and have an internal gain mechanism that is suitable for low light intensity; their responsivity, and therefore their output, is strongly dependent on the device temperature. Thermoelectric coolers (TEC) offers a suitable solution to this problem. A TEC is a solid state cooling device, which can be controlled by changing its current. TECs are compact and rugged, and they can precisely control the temperature to within 0.1 degrees C with more than a 150 degree C temperatue gradient between its surfaces. In this memorandum, a proportional integral (PI) temperature controller for APDs using a TEC is discussed. The controller is compact and can successfully cool the APD to almost 0 degrees C in an ambient temperature environment of up to 27 percent C.read more
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A simple device to allow enhanced bandwidths at 850 nm in multimode fibre links for gigabit LANs
Matthew P. Webster,L.J. Sargent,Peter J Heard,Kevin A. Williams,Richard V. Penty,Ian H. White,David G. Cunningham,M.R.T. Tan +7 more
TL;DR: This paper demonstrates a simpler approach for enhancing the performance of gigabit/s datacommunication links for computer LANs by using focused ion beam etching to suppress the emission at the centre of the output aperture.