switch your focus to equalization what nonlinear optics can do for you cecilia j. vogel research...
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SWITCH YOUR FOCUS TO EQUALIZATION
What Nonlinear Optics
Can do for You
Cecilia J. Vogel
research with Dr. D. Andersen University of Iowa
SWITCH YOUR FOCUS TO EQUALIZATION
What Nonlinear Optics
Can do for You
Cecilia J. Vogel
research with Dr. D. Andersen University of Iowa
SWITCH YOUR FOCUS TO EQUALIZATION
What Nonlinear Optics
Can do for You
Cecilia J. Vogel
research with Dr. D. Andersen University of Iowa
SWITCH YOUR FOCUS TO EQUALIZATION
What Nonlinear Optics
Can do for You
Cecilia J. Vogel
research with Dr. D. Andersen University of Iowa
SWITCH YOUR FOCUS TO EQUALIZATION
What Nonlinear Optics
Can do for You
Cecilia J. Vogel
research with Dr. D. Andersen University of Iowa
SWITCH YOUR FOCUS TO EQUALIZATION
What Nonlinear Optics
Can do for You
Cecilia J. Vogel
research with Dr. D. Andersen University of Iowa
Nonlinearity• Linear:
• The glass is half full• m = V
• Nonlinear:
• The glass is 49.999999…% full• m = V) V
Nonlinear Optics
• Linear Optics: D=E
• Light is slowed in material by a factor of n, leads to refraction
• If very intense, and n depend on intensity
Self-focusing• Light has a tendency to diverge
• Lens slows light with glass
• Light bent toward the slower region
Slowed more
Slowed less
Slowed less
Self-focusing• Light has a tendency to diverge
• Solid state laser can use self-focusing
• Slowed most where beam is most intense
Slowed more
Slowed less
Slowed less
Optical switch
• Can a signal beam be switched from one path (0) to another (1)?
• Guide beam alters the nonlinear material
• Signal beam bent toward it
Equalization Needs
• Single fiber -- many signals
• Each signal -- a different wavelength
• Each signal degrades independently
• Needs to be boosted independently
Equalization
• First dim the brightest• Linear filter: transmission spectrum
constant
• Then boost all by same factor
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