Abstract
A self-referenced passive optical network (PON) with coarse wavelength
division multiplexing (CWDM) is reported for remotely addressing optical intensity
sensors with enhanced sensitivity. The self-referencing remote configuration
is described as a finite-impulse-response (FIR) filter in reflective operation
using two fiber Bragg gratings (FBG) and a fiber delay line. The antisymmetrical
phase response of the configuration permits to achieve a self-referencing
measurement parameter two times more sensitive than reported previously. To
enhance the power budget of the network, CWDM devices with low insertion losses
are used for spectral splitting of a radio-frequency (RF) modulated broadband
light source (BLS). The network topology and the sensor's interrogation technique
are theoretically analyzed and experimental results validating the models
are reported.
© 2009 IEEE
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