Compare dispersion effects single mode and multimode fibre, Electrical Engineering

Assignment Help:

Compare dispersion effects in single mode and multimode fibres?

The optical fibres were categorized within two according to the number of modes it passes as:
• Single mode fibres
• Multi mode fibres

The single mode fibre is which one that passes just the axial ray (fundamental mode) and the multimode fibre passes number of modes by it.

Dispersion of the transmitted optical signal causes distortion for both digital and analog signal transmission by the fibre. When considering the main implementation of the optical fibre transmission that includes some form of digital modulation, the dispersion mechanism inside the fibre causes the broadening of the transmitted light pulse as they travel along the cannel. The dispersion can be separated within two as:

• Intermodal dispersion
• Intramodal dispersion/ chromatic dispersion

The purpose for the intermodal dispersion is number of modes within the fibre. This is the main source of dispersion in multimode fibres.
The Intramodal dispersion occurs in all kinds of optical fibres and results from the finite spectral width of the optical source. Because optical sources do not emit just a single frequency, other than a band of frequencies, then there will be propagation delay differences among various spectral components of the transmitted signal. This causes the broadening of each transmitted mode and therefore intramodal dispersion. The delay differences might be caused through the dispersive properties of the waveguide material (material dispersion) and also the guidance effect inside the fibre structure (waveguide dispersion).

The intermodal dispersion within single mode fibre is extremely low. But in multimode fibres the intermodal dispersion is extremely prominent. Since in multimode fibres number of modes passes by the fibre. The different modes cover various distances and thus reach at the destination at different times. Therefore an input pulse is get as a broadent pulse at the destination. To avoid this problem in multimode fibres the refractive index is varies slowly in the core so that the different rays travels about equal distance and therefore reaches at the destination at the same time. These fibres are known as multimode graded index fibres. Therefore we say in which the dispersion for a graded index fibre is smaller compared to multimode step index fibre other than it is higher compared to single mode fibre. These are describing as shown below:

2134_single mode and multimode fibres.png


Related Discussions:- Compare dispersion effects single mode and multimode fibre

Sketch the phasor diagram showing all the voltages, Q. A balanced wye-conne...

Q. A balanced wye-connected load with a per-phase impedance of 4 + j3  is supplied by a 173-V, 60-Hz three-phase source. (a) Find the line current, the power factor, the total

E. mechanics, a train weight 5 megaN is taking a slope of 1 in 200 at 45 km...

a train weight 5 megaN is taking a slope of 1 in 200 at 45 kmper hour.the engine put in 100 kw.determine the power to be put in by the engine it the train take the slope up of 1 in

Mainframes - introduction to microprocessors , Mainframes Computers lar...

Mainframes Computers larger than minicomputer more power  operating at very high speed  called  mainframes.  They  can processes 64  bit data.  Such computers are used  in defe

Give some applications of german silver, Give some applications of German s...

Give some applications of German silver. German silver is an alloy of zinc, nickel and copper. German silver is used in electrical measuring instruments.

Determine the e.m.f., A 6-pole armature has 1000 conductors and a flux per ...

A 6-pole armature has 1000 conductors and a flux per pole of 40mWb. Determine the e.m.f. generated when running at 600 rev/min when (a) lap wound (b) wave wound.

Determine the kva rating of the synchronous motor, An induction motor takes...

An induction motor takes 350 kW at 0.8 power factor lagging while driving a load. When an overexcited synchronous motor taking 150 kW is connected in parallel with the induction mo

Evaluate the transfer function of the nested-loop system, Q. Determine the ...

Q. Determine the transfer function C(s)/R(s) of the nested-loop feedback system shown in Figure.

Stakeholders - legal requirements for distribution licensees, Stakeholders ...

Stakeholders - Legal Requirements for Distribution licensees There have to be consultations among several stakeholders such as the licensees, the governments, consumers, gener

Logic Gates, A former employs a servant to look after his form house. He in...

A former employs a servant to look after his form house. He instructs the servant to keep a watch on his goat. So that he does not harm the kitchen garden, when the entrance-door

Digital electronic, What are the advantages of wired-AND connection of digi...

What are the advantages of wired-AND connection of digital IC

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd