Sensory passive optical networks and the key issues of fiber Bragg gratings application inside them
Abstract
Sensory passive optical networks and the key issues of fiber Bragg gratings application inside them
Incoming article date: 23.05.2016The principles of construction of sensory passive optical networks, implemented the concept of the unified field of complexed fiber optic sensors and based on hybrid wave and time division multiplexing, are discussed. Their advantages in comparison with classical techniques of oneparameter multiplexing by time, wavelength, frequency, space, codes, etc. are shown. Prototypes and the structure of the sensory passive optical network with a hybrid wave and time division multiplexing are presented. The ability how to survey the point sensors, sensors of quasi-distributed and distributed types are defined, so as ability how to use the probing signals of pulse and continuous types. Especially the issues of similar probing of consecutive Bragg gratings using layered exclusion mechanisms (pulse sensing) and Q-factor measurement of the total envelope of the gratings spectrum (continuous amplitude-phase sensing) are explained. The requirements for the construction of sensory passive optical networks based on the hybrid wave and time division multiplexing in diverse parameters matching of Bragg gratings wavelength with multiplexers based on arrayed waveguide grating are presented. This requrements are based on the possibility of using the latter as support structures for interrogation of the first. Variants of the networks and their characteristics are presented.
Keywords: unified field of complexed fiber-optic sensors, sensory passive optical network, the hybrid time and wave division multiplexing, pulse and continuous probing, fiber Bragg grating, arrayed waveguide grating