By Govind Agrawal
Many of the fabric during this quantity is new. the 1st 3 chapters take care of 3 vital fiber-optic components--fiber-based gratings, couplers, and interferometers--that function the development blocks of lightwave know-how. In view of the large influence of rare-earth-doped fibers, amplifiers and lasers made through the use of such fibers are coated in Chapters four and five. The final 3 chapters describe vital functions of nonlinear fiber optics and are dedicated to pulse-compression ideas, fiber-optic communique platforms, and soliton-based transmission schemes. This quantity should still serve good the necessity of the medical group attracted to such fields as ultrafast phenomena, optical amplifiers and lasers, and optical communications. it is going to even be priceless to graduate scholars in addition to scientists and engineers concerned with lightwave expertise. * education source for engineers concerned with lightwave know-how* Covers the significance of nonlinear results in designing WDM lightwave structures* modern info for researchers
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Extra resources for Applications of Nonlinear Fiber Optics (Optics and Photonics Series)
2, a fiber grating can exhibit bistable switching even when a CW beam is incident on it. However, optical pulses should be used in practice because of the high intensities required for observing SPMinduced nonlinear switching. Even then, one needs peak-intensity values in excess of 10 GW/cm2 . For this reason, bistable switching was first observed during the 1980s using DFB semiconductor amplifiers for which large carrierinduced nonlinearities reduce the switching threshold to power levels below 1 mW –.
29). The 94% peak reflectivity indicates κ L 2 for this grating. 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.
The occurrence of modulation instability in the normal-GVD region is solely a grating-induced feature. The preceding analysis completely ignores boundary conditions. For a finite-length grating, one should examine the stability of the CW solution obtained in terms of the elliptic functions. Such a study is complicated and requires a numerical solution to the nonlinear coupled-mode equations . The results show that portions of the upper branch of the bistability curves in Fig. 12 can become unstable, resulting in the formation of a pulse train through modulation instability.
Applications of Nonlinear Fiber Optics (Optics and Photonics Series) by Govind Agrawal