Research On Optical Characteristics Of Sampled Fiber Gratings

As a result of the widely use of wavelength division multiplexing (WDM) technology and the fast progress of all-optical communication networks, high-performance photonic devices become one of the key issues for further development optical communication technology. It can be said, to a certain extent, that the prospect and the development direction of optical communication technique depends largely on the research of various novel photonic devices with high performances.Optical fiber gratings have many advantages when they are used in fiber systems, such as the flexible structures, low insertion loss, full compatibility, and good filtering performance. Optical fiber gratings have found many applications in the fields of fiber lasers, fiber sensing, multiplexing and demultiplexing in WDM systems, optical signal processing and so on. Due to their multiple-wavelength filtering properties, sampled fiber gratings can be used as the key components in the developments of tunable fiber lasers, multi-channel dispersion compensation, and multi-wavelength filters, and received more and more attentions in resent years. In this thesis, the optical properties of various sampled fiber gratings have been discussed and analyzed via numerical techniques. The major points are as follows.(1) As the basis for the analysis of fiber gratings with arbitrary structures, the coupled mode equations for fiber gratings were derived in great details, based on which, the numerical methods for calculating the optical properties of arbitrary structure fiber gratings were analyzed and discussed, and the corresponding programs have been complied.(2) The optical spectral properties of various amplitude sampled fiber gratings have been calculated and analyzed in details. The effects of various design parameters, such as grating length, chirp parameters, etc. on the grating properties were studied.(3) Based on the discussion of the great advantages of phase sampled fiber gratings, the optical properties of binary sampled fiber gratings were calculated, and the effects of various parameters were analyzed and discussed.(4) A theoretical basis and guide line for the design of sampled fiber gratings for specific applications have been concluded based on large amount of calculations.