How Does Material Dispersion Affect Pulse Length in a Waveguide?

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SUMMARY

The discussion centers on calculating the effects of material dispersion on pulse length in a 10 km single mode waveguide driven by an LED with a spectral width of 60 nm centered at 800 nm. The material dispersion is specified as -100 ps/km/nm. The calculations reveal that the optical pulse length at the end of the waveguide is influenced by this dispersion, and the maximum practical pulse rate must be determined to ensure distinguishable pulses. The results provide critical insights into the design and optimization of optical communication systems.

PREREQUISITES
  • Understanding of material dispersion in optical fibers
  • Knowledge of pulse propagation in waveguides
  • Familiarity with LED characteristics and spectral width
  • Basic principles of optical communication systems
NEXT STEPS
  • Calculate the impact of different material dispersion values on pulse length
  • Explore the relationship between spectral width and pulse rate in optical systems
  • Investigate advanced techniques for mitigating dispersion in waveguides
  • Learn about the design considerations for high-speed optical communication systems
USEFUL FOR

This discussion is beneficial for optical engineers, telecommunications professionals, and students studying optical communication systems, particularly those focusing on waveguide design and performance optimization.

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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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i got it.
thank you!
 
tuanle007 said:
i got it.
thank you!

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

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