Abstract
An edge filter-based ratiometric wavelength measurement system is modeled and
analyzed in this paper. The results confirm that the noise of input signal and
photodetectors limits the resolution of the wavelength measurement system. The
achievable resolution is calculated for a given noise level of the input signal and
photodetectors' resolution. An improved ratiometric wavelength measurement system
consisting of two fiber comb filters is presented both theoretically and experimentally,
which performs coarse and fine wavelength measurements simultaneously. The resolution of
the system is significantly improved to better than 5pm while maintaining the potential
for high measurement speed and wide measurable wavelength range.
© 2011 IEEE
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