This paper presents a novel technique for dispersion compensation, employing a linear chirped fiber Bragg grating (CFBG) with a thermal head consisting of several micro-heaters. The micro-heaters temperature are controlled by computer, and the change of micro-heaters temperature will induce the change of grating temperature, and the change of Bragg wavelength, and the change of delay and dispersion of the grating. Thereby, the goal of tunable dispersion compensation to different systems dispersion and the survival dispersion has been achieved.
In this paper, the amplification mechanism of ultra-wide-band telluride-based fiber Raman amplifier (T-FRA) is described, and the Raman gain coefficient spectra of telluride-based fiber are studied thoroughly by compare the stimulated Raman scattering (SRS) characteristics of the telluride-based fiber with silica-based fibers. First, the cooperation of phonons and photons in telluride-based fibers is analyzed. Then the reason why Raman scattering of the telluride-based fibers can lead to a large gain coefficient and Stokes shift is discussed. The physical basis is analyzed in this paper and the energy of molecular vibration is taken into account. A multi-pumping scheme is provided at the end of the paper to apply gain-flattened T-FRA to WDM system.