![]() Contact M2 Optics for your custom optical fiber platform. As a result, these techniques are widely used to help solve the problem of chromatic dispersion.Ĭheck out our free downloadable fiber optics resources. Another method calls for using dispersion compensating fiber at the end of a length to correct or reverse the dispersion that was realized as the signal traversed the optical fiber. Easy to use Windows-based software provides all industry standard calculation techniques for the determination of zero dispersion wavelength and dispersion slope. One method involves pre-compensating the signal for the anticipated dispersion before it's sent down the optical fiber. The 2800 Chromatic Dispersion Measurement System provides fast, accurate measurements of chromatic dispersion and length of all types of single-mode optical fibers. The bottom line is that chromatic dispersion becomes a major consideration and must be accounted for when developing or deploying fiber optic equipment for use in telecommunications, cable TV, or other high-speed optical networks.įortunately, techniques have been developed that help compensate for the negative effects of chromatic dispersion. Dispersion is added as the modulated beam of light, consisting of a number of closely spaced wavelengths, travels down this nearly transparent waveguide. The result is that at any given length, the effective information capacity, or bandwidth, of the fiber optic cable can be significantly reduced. This degradation makes the signals (1s and 0s) more difficult to distinguish from each other at the far end of the fiber. Its effect is essentially to stretch or flatten the initially sharply-defined binary pulses of information. In fiber-based systems, an optical fiber, comprised of a core and cladding with differing refractive index materials, inevitably causes some wavelengths of light to travel slower or faster than others.Ĭhromatic dispersion is a serious consideration in long-haul optical fibers. This dispersion occurs because different colors, or light frequencies, act slightly differently as they pass through a medium such as glass. Sir Isaac Newton observed this phenomenon when he passed sunlight through a prism and saw it diverge into a spectrum of different colors. Special care must be taken to compensate for this dispersion so that the optical fiber delivers its maximum capacity.Ĭhromatic dispersion is commonplace, as it is actually what causes rainbows - sunlight is dispersed by droplets of water in the air. The result is a spreading, or dispersion, of the on-off light pulses that convey digital information. Chromatic dispersion causes the temporal broadening or narrowing of the pulse, while time jitter complicates the detection process at the receiver. It is the result of the different colors, or wavelengths, in a light beam arriving at their destination at slightly different times. Chromatic dispersion is described by the Abbe number ( Figure 2 ), which corresponds to the reciprocal of the first partial derivative of refractive index with respect to, and partial dispersion, which corresponds to the second derivative of refractive index with respect to wavelength. Chromatic dispersion is a phenomenon that is an important factor in fiber optic communications.
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