By Govind Agrawal
Many of the fabric during this quantity is new. the 1st 3 chapters care for 3 vital fiber-optic components--fiber-based gratings, couplers, and interferometers--that function the construction blocks of lightwave know-how. In view of the big effect of rare-earth-doped fibers, amplifiers and lasers made by utilizing such fibers are lined in Chapters four and five. The final 3 chapters describe vital functions of nonlinear fiber optics and are dedicated to pulse-compression concepts, fiber-optic conversation structures, and soliton-based transmission schemes. This quantity should still serve good the necessity of the medical neighborhood drawn to such fields as ultrafast phenomena, optical amplifiers and lasers, and optical communications. it is going to even be beneficial to graduate scholars in addition to scientists and engineers all in favour of lightwave know-how. * education source for engineers concerned with lightwave expertise* Covers the significance of nonlinear results in designing WDM lightwave platforms* modern details for researchers
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Extra info for Applications of Nonlinear Fiber Optics (Optics and Photonics Series)
In the case of a fiber grating, the presence of an intensity-dependent term in Eq. 1) leads to SPM and XPM of counterpropagating waves. These nonlinear effects can be included by solving the nonlinear coupled-mode equations, Eqs. 12). 23 CW Nonlinear Effects In this section, these equations are used to study the nonlinear effects for CW beams. The time-dependent effects are discussed in later sections. 1 Nonlinear Dispersion Curves In almost all cases of practical interest, the β 2 term can be neglected in Eqs.
7-nm wide. 84 mm and an index change of 1 2 ¢ 10 3 . The coupled-mode theory explains the observed reflection and transmission spectra of fiber gratings quite well. An undesirable feature seen in Figs. 8 from a practical standpoint is the presence of multiple sidebands located on each side of the stop band. These sidebands originate from weak reflections occurring at the two grating ends where the refractive index changes suddenly compared to its value outside the grating region. Even though the change in refractive index is typically less than 1%, the reflections at the two grating ends form a Fabry–Perot cavity with its own wavelength-dependent transmission.
Such gratings are called λ 4shifted or phase-shifted gratings since a distance of λ 4 (half grating period) corresponds to a π 2 phase shift. They are used routinely for making distributed-feedback (DFB) semiconductor lasers . Their use for fiber gratings was suggested in 1994 . The π 2 phase shift opens a narrow transmission window within the stop band of the grating. 13(a) compares the transmission spectra for the uniform and phase-shifted gratings at low powers. At high powers, the central peak bends toward left, as seen in the traces in Fig.
Applications of Nonlinear Fiber Optics (Optics and Photonics Series) by Govind Agrawal