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How can i plot fiber waveguide dispersion using matlab programme?
Wiki User
∙ 14y ago
Hi,
First I assume you are familiar with the fiber characteristic wave equation. If not, it appears on many textbooks, like Okoshi Takanori, Amnon Yariv, Katsunary Okamoto or Dietrich Marcuze.
One option is to determine the "beta" ()propagation constant) at each "v" number separately. The low v numbers require high resolution since the char. equation oscillates very fast and erratically. Above v=1 it becomes relaxed and the beta shall be found very stably
Another thing is that if can make the relaxed approximated of using LP modes, rather than the full vectorial HE / EH / TM / TE, the equation if much simpler, If your fiber has small delta-n, below 0.02, this is the usually the case.
Good Luck.
Y. Sh.
Wiki User
∙ 14y ago
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What is the Unit for Dispersion in optical fiber?
unit of dispersion is: (picosecond)/ nanometer kilometer
What are the difference between dispersion and deviation?
DISPERSION In optics, dispersion is the phenomenon that the phase velocity of a wave depends on its frequency.[1] In a prism, dispersion causes the spatial separation of a white light into spectral components of different wavelengths. Dispersion is most often described in light waves, but it may happen to any kind of wave that interacts with a medium or can be confined to a waveguide, such as sound waves. Dispersion is sometimes called chromatic dispersion to emphasize its wavelength-dependent nature.There are generally two sources of dispersion: material dispersion and waveguide dispersion. Material dispersion comes from a frequency-dependent response of a material to waves. For example, material dispersion leads to undesired chromatic aberration in a lens or the separation of colors in a prism. Waveguide dispersion occurs when the speed of a wave in a waveguide (such as an optical fiber) depends on its frequency for geometric reasons, independent of any frequency dependence of the materials from which it is constructed. This type of dispersion leads to signal degradation in telecommunications because the varying delay in arrival time between different components of a signal "smears out" the signal in time.DEVIATIONA deviation is a difference or the (real or metaphorical) route followed by a different choice.Deviation can refer to:Deviation (statistics), the difference between the value of an observation and the mean of the population in mathematics and statistics.Standard deviation, which is based on the square of the difference.Absolute deviation, where the absolute value of the difference is used.Frequency deviation, the maximum allowed "distance" in FM radio from the nominal frequency a station broadcasts at.Magnetic deviation, the error induced in compasses by local magnetic fields.Deviationism, an expressed belief which is not in accordance with official party doctrine.Deviation Records, a record label.Deviant behavior, a behavior that is a recognized violation of social norms.Deviates is also the name of an American punk rock band.
How does dispersion affect optical fiber?
Dispersion affects optical fibers in the sense that dispersion causes a disruption in the frequency of lights waves and can focus the wavelength nature of light.
What has the author A G Hanson written?
A. G. Hanson has written: 'Optical waveguide communications glossary' -- subject(s): Fiber optics, Dictionaries
Why modal dispersion limits the fiber bandwidth?
In a multimode fiber modal dispersion causes each mode to have a different velocity and reach to the end of the fiber at a different time. This will cause inter-symbol interference (ISI) which means that we need to send data at lower rates in order to prevent ISI. Lower rates means a reduction in bandwidth.
What are the negative things about fiber optic?
In the fiber optics there are different types of losses; these are the bending loss, absorption loss, dispersion loss, and scattering losses. Bending losses is the loss which exists when an optical fiber undergoes bending, this includes macroscopic and microscopic bending. Absorption loss is the absorption of light energy resulting in dimming of light at the end of the fiber, this includes intrinsic and extrinsic absorption. Dispersion loss is the distortion of the signal as it travels along the fiber optic cable, this includes intermodal and intramodal dispersion. Scattering losses occurs due to microscopic variations in the material density, compositional fluctuations, structural homogeneities and manufacturing defects, this includes linear and non-linear scattering.
Material dispersion equation with curve?
Material dispersion in a step index fiber is given by:Dispersion = -(length/c)*((DELTA_wavelength)/wavelength)*(2nd derivitive of n1 wrt wavelength)c = speed of lightDELTA_wavelength/wavelength is usually given as a percentage2nd derivitive of n1 wrt wavelength can be found using a graph.Since n1 is a function of the fiber you're using you must obtain a graph of dispersion for that particular material. I have a graph for glass silica. Let me know if you need it.
Brief explanation about the types of waveguides?
A waveguide is a structure which guides waves, such as electromagnetic waves or sound waves. There are different types of waveguide for each type of wave. The original and most common meaning is a hollow conductive metal pipe used to carry high frequency radio waves, particularly microwaves.Waveguides differ in their geometry which can confine energy in one dimension such as in slab waveguides or two dimensions as in fiber or channel waveguides. In addition, different waveguides are needed to guide different frequencies: an optical fiber guiding light (high frequency) will not guide microwaves (which have a much lower frequency). As a rule of thumb, the width of a waveguide needs to be of the same order of magnitude as the wavelength of the guided wave.
What are cotton?
Cotton is a soft, fluffy staple fiber that grows in a boll, or protective capsule, around the seeds of cotton plants of the genus Gossypium. The fiber is almost pure cellulose. Under natural conditions, the cotton bolls will tend to increase the dispersion of the seeds.
How Radiation mode work in a optical fiber?
From Wikipedia, the free encyclopediaJump to: navigation, search For an optical fiber or waveguide, a radiation mode or unbound mode is a mode which is not confined by the fiber core. Such a mode has fields that are transversely oscillatory everywhere external to the waveguide, and exists even at the limit of zero wavelength.Specifically, a radiation mode is one for whichwhere β is the imaginary part of the axial propagation constant, integer l is the azimuthal index of the mode, n(r) is the refractive index at radius r, a is the core radius, and k is the free-space wave number, k = 2π/λ, where λ is the wavelength. Radiation modes correspond to refracted rays in the terminology of geometric optics.
What is the operating frequency of optical fiber?
In Optical Fiber Communication system 1300-1550 nm range wavelengths are used.. Reason for tis s "In this range only we can acheive low attenuation with zero dispersion"
Why do optical signals used in fiber optic cables have a very short wavelength?
The pulses of light used in optical fiber are in the infrared or visible spectrum, which is shorter wavelength than the microwave radio spectrum. Neither microwave radio wavelengths nor ultraviolet spectrum wavelengths can pass through the materials used for fiber optic cables.In the early 1950s A. T. & T. had begun laying a system of a few thousand miles of underground microwave waveguides (similar in purpose to modern underground fiber optics systems) but the system was never finished and ultimately proved to be not cost effective. But the cost per foot of fiber optic cables is nearly negligible compared to the cost of metallic waveguides, the diameter of fiber optic cables is much smaller compared to the diameter of waveguides allowing many more cables in the same space as one waveguide, and the shorter wavelength allows wider bandwidth signals on each of these fibers than the waveguide could carry.Perhaps someday fibers might be able to be made of material that can allow ultraviolet spectrum wavelengths to pass and even wider bandwidth signals could be sent, but not now.
