An amplitude—phase-conversion self-referencing technique for intensity-modulated photonic sensors that uses two different-wavelength fiber Bragg gratings is presented. With this technique, the system response has been demonstrated to be almost unafffected by network power variations as high as 90% of the total power launched by the source. We prove the multiplexing capability of this type of self-referenced fiber sensor by wavelength-division multiplexing two of them in a star network. A tunable fused biconical wavelength-division multiplexer is used for sensor addressing at the detection block, providing both good isolation and low cross-talk values.
© 2002 Optical Society of America
S. Abad, M. López-Amo, F. M. Araújo, L. A. Ferreira, and J. L. Santos, "Fiber Bragg grating—based self-referencing technique for wavelength-multiplexed intensity sensors," Opt. Lett. 27, 222-224 (2002)