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Optics for Engineers
book

Optics for Engineers

by Charles A. DiMarzio
August 2011
Intermediate to advanced content levelIntermediate to advanced
564 pages
20h 45m
English
CRC Press
Content preview from Optics for Engineers
OPTICAL DETECTION 421
which is considerably higher than the photon noise for the visible detector in Table 13.1; this
detector will not be quantum-limited.
13.3.2 Noise-Equivalent Power
It is often useful to ask how much power would have been required at the input to the detector,
to produce a signal equivalent to this noise. This power is called the noise-equivalent power,
or NEP. In general,
NEP =
i
n
ρ
i
, (13.27)
and specically for Johnson noise,
NEP =
4k
B
TB
R
hν
ηe
(Johnson noise). (13.28)
Several other sources of noise may also arise in detection. A typical detector specication
will include the NEP, or more often the NEP per square root of bandwidth,
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Publisher Resources

ISBN: 9781439807255