By Govind Agrawal
Because the box grew, Agrawal determined to separate this article off from his Nonlinear Fiber Optics, that is extra fascinated by the discipline's basics. This variation is meant for senior undergraduates, graduate scholars, engineers and technicians within the telecommunications undefined, and scientists operating with fiber optics and optical communications. It covers the construction blocks of light-wave expertise - fiber-based gratings, couplers, and interferometers - in addition to amplifiers and lasers made utilizing rare-earth-doped fibers; pulse-compression recommendations; fiber-optic communique structures; and soliton-based transmission schemes.
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Extra info for Applications of Nonlinear Fiber Optics
053 µ m, chosen to coincide with the wavelength of an Nd:YLF laser . From the stop-band width, the coupling coefficient κ is estimated to be about 7 cm 1 . Note the sharp drop in reflectivity at both edges of the stop band and a complete absence of sidebands. The same apodized fiber grating was used to investigate dispersive properties in the vicinity of a stop-band edge by transmitting 80-ps pulses (nearly Gaussian shape) through it . 10 shows the variation of the pulse width (a) and changes in the propagation delay during pulse transmission (b) as a function of the detuning δ from the Bragg wavelength on the upper branch of the dispersion curve.
This aspect of chirped fiber gratings is discussed in Chapter 6. Chirped gratings also exhibit interesting nonlinear effects when the incident pulse is sufficiently intense. In one experiment, 80-ps pulses were propagated through a 6-cm-long grating whose linear chirp could be varied over a considerable range through a temperature gradient established along its length . The reflected pulses were split into a pair of pulses by the combination of SPM and XPM for peak intensities close to 10 GW/cm2 .
Located at z -5 2 -15 -10 -5 0 Detuning (b) 5 10 and (b) the phase of r g plotted as a function of 0. The reflection coefficient is then given by rg A˜ b ´0µ A˜ ´0µ B2 · r´qµA1 A1 · r´qµB2 f If we use the boundary condition A˜ b ´Lµ 0 in Eq. 28) Using this value of B2 and r´qµ from Eq. 22) in Eq. 29) The transmission coefficient tg can be obtained in a similar manner. The frequency dependence of rg and tg shows the filter characteristics associated with a fiber grating. 7 shows the reflectivity rg 2 and the phase of rg as a function of detuning δ for two values of κ L.
Applications of Nonlinear Fiber Optics by Govind Agrawal