Abstract
Optical waveguide sensors based on cascaded double- ring
resonators are analyzed theoretically and experimentally, for both wavelength
interrogation and intensity interrogation methods. It is shown that for the
wavelength interrogation, the sensitivity can be increased by over three orders
of magnitude by combining the intensity ratio detection of two central peaks,
compared with the simple digital operation mode of the central peak wavelength
shift detection of the transmission spectrum. While the detection limit of
the wavelength interrogation method is several times smaller than that of
intensity interrogation method, the latter has advantages of simplicity and
low cost which can outweigh the sensitivity reduction for many practical applications.
Experimental results showed good agreements with the theoretical analysis.
© 2012 IEEE
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