How Does Material Dispersion Affect Pulse Length in a Waveguide?

In summary, the given conversation discusses the characteristics and parameters of a light emitting diode (LED) and a single mode waveguide. It mentions the length and material dispersion of the waveguide, as well as the spectral width and center wavelength of the LED radiation. It also poses two questions related to the system's pulse length and maximum practical pulse rate.
  • #1
tuanle007
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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

 
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  • #2
i got it.
thank you!
 
  • #3
tuanle007 said:
i got it.
thank you!

You're welcome! Glad we could be of help :biggrin: :confused:
 

Related to How Does Material Dispersion Affect Pulse Length in a Waveguide?

1. What is a Light Emitting Diode (LED)?

A Light Emitting Diode, or LED, is a semiconductor device that emits light when an electric current passes through it. It contains a positively charged layer and a negatively charged layer, with a junction between them. When electrons flow across this junction, they release energy in the form of light.

2. How does an LED work?

LEDs work through a process called electroluminescence. When an electric current is applied to the LED, electrons flow from the negatively charged layer to the positively charged layer. As the electrons cross the junction, they release energy in the form of photons, or light particles.

3. What are the advantages of using LEDs?

LEDs have several advantages over traditional light sources, such as incandescent or fluorescent bulbs. They are more energy efficient, have a longer lifespan, and can produce a wider range of colors. They also do not contain harmful substances like mercury, making them more environmentally friendly.

4. What are the different types of LEDs?

There are several types of LEDs, including organic LEDs (OLEDs), inorganic LEDs, and high-powered LEDs. OLEDs use an organic compound to emit light, while inorganic LEDs use a semiconductor material. High-powered LEDs are used for applications that require a brighter and more focused beam of light, such as in automotive headlights or stadium lighting.

5. How are LEDs used in everyday life?

LEDs have a wide range of applications in everyday life. They are commonly used in lighting, such as in household bulbs, streetlights, and automotive lighting. They are also used in electronic devices, such as TVs, computer screens, and smartphones. LEDs are also used in signage, traffic lights, and medical devices.

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