On the noise of high-transimpedance amplifiers for long-wavelength pulse OTDRs

Noise measurements on high-transimpedance amplifiers suitable for long-wavelength OTDRs give results higher than is predicted by normal noise models. Consequently, the authors have developed two useful techniques to measure independently the noise contribution of the JFET and the feedback resistor t...

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Bibliographic Details
Published in:Optical and quantum electronics 1987-03, Vol.19 (2), p.123-129
Main Authors: HOWARD, R. M, JEFFERY, R. D, HULLETT, J. L
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Miscellaneous
Optical and optoelectronic circuits
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Summary:Noise measurements on high-transimpedance amplifiers suitable for long-wavelength OTDRs give results higher than is predicted by normal noise models. Consequently, the authors have developed two useful techniques to measure independently the noise contribution of the JFET and the feedback resistor to the overall amplifier noise. Results show that the noise of the JFET is in accordance with an accurate theoretical model for such a device. In contrast, the noise from the feedback resistor is much higher than is predicted from the normal resistance-capacitance model for such a component. This increase results from the distributed nature of high-ohmic resistors.
ISSN:0306-8919
1572-817X
DOI:10.1007/BF02029880