Abstract
Theoretical modeling, analysis, and experimental investigation of effect
of noise on an edge filter based ratiometric wavelength measurement system
have been carried out. A basic noise model for a ratiometric wavelength measurement
system which considers both optical and electrical noise is presented. The
ratio response of the system has been theoretically modeled considering the
limited signal-to-noise ratio (SNR) of source and noise of the receiver circuit
and experimentally verified using a macrobend fiber edge filter based ratiometric
system. It is shown both theoretically and experimentally that increasing
the slope of the edge filter is not necessarily an efficient solution to increasing
the resolution of the system and the effect of noise must be accounted for.
The resolution of the system changes with wavelength, and an optimization
of slope of the ratio of the system is necessary to determine the best possible
resolution for a wider wavelength range. In the demonstrated example, we have
shown that for systems with slopes of 0.16, 0.22, and 0.31 dB/nm, one can
achieve 10-pm resolution for a range of 36, 22, and 16 nm, respectively, starting
from 1500 nm in the presence of receiver noise at $-$10-dBm input power and with an optical signal SNR
of 50 dB.
© 2008 IEEE
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