Performance monitoring is one of the key features to create self-managed optical networks. Monitoring the characteristics of an optical channel is important for designing robust and reliable optical telecommunication system. This book examines the use of highly integrated ( 500 microns) and low loss ( 1 dB) in-fiber taps for monitoring the power and the wavelength of an optical signal that propagates in the core of an optical fiber. The dispersive scattered light from single of multiple tilted fiber Bragg gratings (TFBG) may be measured and serve as a monitoring signal. Novel power and wavelength monitors have been designed and realized by exploiting this key characteristic. The power monitor can measure the power of a single wavelength signal over a bandwidth that can be adapted by the grating tilt angle. The wavelength monitor provides both a high wavelength selectivity (sub-picometer level) and a large operating wavelength window ( C-band). The impact of an undesirable variation of the polarization state of the incident light on the device performances has been analyzed as well as ways for compensating it.

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