Waves Flashcards
functions of cladding
-with lower refractive index(less optically dense) so allows TIR
-protection to avoid light escape
benefits of optical fibre
-no heat loss
-more info as frequency is higher
-quickly travel
-no electrical interference
How could signals be degraded
absorption and dispersion
what is absorption
info loss as the material absorbs signals energy, reducing the amplitude
what is dispersion
causes pulse broadening, receiving signal is broader than the initial, broadened pulses overlap, resulting in info loss
what is material dispersion
caused by different amounts of refraction experienced by different wavelengths of light
how to prevent material dispersion
-monochromatic light
-optical fibre repeaters
what is modal dispersion
caused by light rays entering at different angles so different paths, the one travel straight through always faster
how to prevent modal dispersion
-single mode fibre=narrower the paths
What colour of light get diffracted the most(in the same medium)
Blue/violet
State the relationship between refractive index, wavelength and amount of refraction
-short wavelength of ray=high refractive index =more refraction
-long wavelength=lower refractive index=less refraction
What does “optically dense” mean
High refractive index
