Abstract
An investigation is performed on the characteristics of two self-referencing resonant fiber optic intensity sensors supported by a Michelson topology. The sensors are based in transmissive and reflective configurations respectively. Via the definition of the measurement parameter (R parameter) the sensitivity and Linearity of the sensors are analyzed. The problem of sensor design and optimization is considered and the features of the two configurations are addressed.

Abstract
A closed loop technique for measuring Bragg wavelength shifts based on active wavelength tuning of a WDM coupler is presented. By stretching the coupling region of a fused biconical WDM, the 3 dB point is set by the feedback loop to always match the reflected Bragg wavelength. With this scheme, sensitivities usually associated with highly selective WDM can be obtained without compromising the measurement range.

Abstract

Abstract
We report on the integration of optical fiber containing Bragg gratings in the structure of both optical and power cables. It is shown that fiber Bragg gratings provide an efficient method to monitor quasi-distributed mechanical strength along optical cables. This technology is also applied to the monitoring of temperature in power cables for transmission/distribution infrastructures. We show that there are no losses introduced during the cabling process, and the temperature sensitivity of the fiber Bragg grating was found to be only slightly affected by the extrusion process. Results are presented for cable operation in real environment.

Abstract
In this paper, we report experimental results on the frequency control of an optical oscillator based on a single-cavity DFB-MQW laser and a fiber loop reflector. Self-pulsation frequency can be controlled by changing the step amplitude of the laser bias current.

Abstract
An experimental set-up configuration, which allows the self-pulsation frequency of an optical oscillator to be modified by simply adjusting the bias current between 25 and 100 mA, is presented. For lower currents, the self-pulsation frequency is near 6 GHz and the device is stable. For higher currents, the self-pulsation frequency increases to near 11 GHz.