Applications of Nonlinear Fiber Optics (Optics and Photonics by Govind Agrawal

By Govind Agrawal

Lots of the fabric during this quantity is new. the 1st 3 chapters take care of 3 very important fiber-optic components--fiber-based gratings, couplers, and interferometers--that function the construction blocks of lightwave know-how. In view of the big influence 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 very important purposes of nonlinear fiber optics and are dedicated to pulse-compression suggestions, fiber-optic communique structures, and soliton-based transmission schemes. This quantity should still serve good the necessity of the clinical group drawn to such fields as ultrafast phenomena, optical amplifiers and lasers, and optical communications. it is going to even be valuable 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 platforms* brand new details for researchers

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Extra info for Applications of Nonlinear Fiber Optics (Optics and Photonics Series)

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An 8-cm-long grating, with its Bragg wavelength centered near 1536 nm, was used in the experiment. It had a peak reflectivity of 98% and its stop band was only 4-GHz wide. The 3-ns input pulses were obtained by amplifying the output of a pulsed DFB semiconductor laser to power levels as high as 100 kW. Their shape was highly asymmetric because of gain saturation occurring inside the amplifier chain. 9 GHz). 18(a) shows a sharp rise in the transmittivity from a few percent to 40% when the peak power of input pulses increases beyond 2 kW.

However, above a certain input power, most of the incident power is transmitted. Switching from a low-to-high transmission state can be understood qualitatively by noting that the effective detuning δ in Eqs. 2) becomes power dependent because of the nonlinear contribution to the refractive index in Eq. 1). Thus, light that is mostly reflected at low powers because its wavelength is inside the stop band may tune itself out of the stop band and get transmitted when the nonlinear index change becomes large enough.

We refer to Ref. [79] for details. 12 shows the transmitted versus incident power [both normalized to a critical power Pcr 4 ´3γ Lµ] for several detuning values within the stop band by taking κ L 2. The S-shaped curves are well known in the context of optical bistability occurring when a nonlinear medium is placed inside a cavity [88]. In fact, the middle branch of these curves with negative slope is unstable, and the transmitted power exhibits bistability with hysteresis, as shown by the arrows on the solid curve.

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