How Does Material Dispersion Affect Pulse Length in a Waveguide?

  • Thread starter Thread starter tuanle007
  • Start date Start date
  • Tags Tags
    Diode Light
tuanle007
Messages
35
Reaction score
0

Homework Statement



A Light emitting diode (LED) drives a single mode waveguide that is 10 km long, and has a material dispersion of – 100 ps/km/nm for wavelengths near 800 nm. The LED radiation has a spectral width of 60 nm and is centered at 800 nm.

a) If the LED is pulsed on and off in 5 ns, what is the length of the optical pulse when it arrives at the end of the waveguide?
b) What is the maximum practical pulse rate for this system, if the received pulses are to be distinguishable from one another?


Homework Equations





The Attempt at a Solution

 
Physics news on Phys.org
i got it.
thank you!
 
tuanle007 said:
i got it.
thank you!

You're welcome! Glad we could be of help :biggrin: :confused:
 
Thread 'Need help understanding this figure on energy levels'

Thread 'Need help understanding this figure on energy levels'

This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
View full post »
Thread 'Understanding how to "tack on" the time wiggle factor'

Thread 'Understanding how to "tack on" the time wiggle factor'

The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
View full post »

Similar threads

Light Emitting Diode (LED) Driving 10km Waveguide
Replies
1
Views
2K
Estimating loss-limited transmission distance
Replies
6
Views
2K
Engineering Optical Fibres: Wavelength for Zero net Dispersion
Replies
3
Views
1K
Engineering Optical Fibres: Spectral Width Calculation
Replies
4
Views
2K
Connect: Coupling Light from 2 LEDs into a Single Fiber
Replies
2
Views
3K
How Does Pulse Duration Affect Frequency Spread in a Gaussian-Enveloped Laser?
Replies
1
Views
2K
How does graded-index material reduce pulse spreading in optical fibres?
Replies
5
Views
2K
What is the coherence length and coherence time of the filtered light?
Replies
2
Views
7K
How long does it take a 1ms pulse of light to travel 20m
Replies
11
Views
3K
MHB How Many Photons Does a Laser Emit in a Single Pulse?
Replies
10
Views
9K

Hot Threads

Recent Insights

Back
Top