By Asu Ram Jha
This publication bargains complete assurance of the optimal layout of a variety of FO structures. the writer avoids complicated arithmetic and derivations, yet he bargains the equations essential to eloquently describe FO parts and platforms. clarity is more suitable via very good figures, diagrams and graphs. one of many extra very important positive aspects of Fiber Optic expertise is superb insurance of a large choice of purposes together with army and area, advertisement and business structures, communications and telecommunications structures, scientific and clinical purposes, and commercial sensors.
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Additional resources for Fiber Optic Technology: Applications to Commercial, Industry, Military, and Space Optical Systems
It is important to mention that too little dispersion spreads the signals and reduces their interactions. On the other hand, too much dispersion limits the transmission distance and may require dispersion-control schemes. Optimum performance requires a fiber with a balanced amount of material dispersion, namely, 5 to 10 ps/nm-km. Projected material-dispersion curves as a function of wavelength for SM fibers are shown in Figure 1–8. 2 Chromatic Dispersion Chromatic dispersion in an optical fiber is strictly dependent on optical wavelength, operating temperature, CTE of the core material, and surface conditions 24 Chapter 1: Performance Requirements for Fiber Core, Cladding, and Jacket of the core.
Studies performed by the author on optical fibers indicate that the core diameter could have a spectrum variation as a function of parameter z. For small coupling magnitude or perturbation, the round-fiber theory and the slab-guide theory yield comparable results. The studies indicate that a round or circular optical fiber will have radiation loss much larger than the slab-guide radiation loss. On the other hand, coupling is strictly dependent on the correlation length. In the absence of loss, the short-correlation-length coupling produces a steadystate distribution of the optical power in the lowest-order mode.
1 Optical Limiters Optical limiters are used to protect the sensitive optical amplifiers and receivers from unexpected and sudden high-power optical pulses. The limiters only allow the transmission of low-intensity optical signals, while blocking the highintensity signals. These devices use microlens arrays, porous optical substrates, and optical fibers of specific lengths. The new generation of optical-limiter designs will be based on sol-gel glass fabrication technology capable of 55 56 Chapter 3: Fiber Optic Passive Components Circulator 1 λ1 λ3 λ5 λ7 1 Input λ 1,2,3,4,5,6,7,8 Fiber Bragg Gratings Isolator 2 λ2 λ6 3 Circulator 2 3-dB Coupler λ2 λ4 λ6 λ8 1 Fiber Bragg Gratings 2 3 λ1 λ5 BWDM4 λ4 BWDM8 BWDM2 λ8 λ2 BWDM6 BWDM3 λ6 λ3 BWDM7 BWDM1 λ7 λ1 BWDM5 λ5 Demultiplexer (a) Demultiplexer Configuration Circulator 1 λ4 BWDM4 λ8 λ2 BWDM8 BWDM2 λ6 λ3 BWDM6 BWDM3 λ7 λ1 BWDM7 BWDM1 λ5 BWDM5 λ6 λ2 2 3 Circulator 2 λ6 λ2 2 Input λ 1,2,3,4,5,6,7,8 1 3 dB Coupler 3 1 Multiplexer (b) Multiplexer Configuration Figure 3–1 Demultiplexing (a) and multiplexing system (b) configurations showing various FO components.