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Homework Help: Laser to be used in fiber optics

  1. Jul 4, 2007 #1
    1. The problem statement, all variables and given/known data

    Which of the following can / cannot be used for fiber optic communication.
    What is the general rule / cut-off (in terms of wavelength) for deciding ?
    Thank you.

    Choices (Laser type/wavelength, nm)

    Argon fluoride (UV) 193
    Krypton fluoride (UV) 248
    Xenon chloride (UV) 308
    Nitrogen (UV) 337
    Argon (blue) 488
    Argon (green) 514
    Helium neon (green) 543
    Helium neon (red) 633
    Rhodamine 6G dye (tunable) 570-650
    Ruby (CrAlO3) (red) 694
    Nd:Yag (NIR) 1064
    Carbon dioxide (FIR) 10600

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jul 5, 2007 #2


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    Science Advisor
    Homework Helper

    Depends on the fibre!
    Most coms fibres run at 1.55um, Si02 has very good transmission and very low dispersion around this band.

    In theory you could use most of those lasers although you might have difficulty getting low enough OH fibre to use the UV ones.
  4. Jul 9, 2007 #3
    Like mgb_phys said, it depends on the fiber.

    UV does not transmit well through glass.

    That is why you can't get a sunburn sitting in your car, but you can feel hot because IR does pass through glass.

    Each fiber has an optimal bandwidth (range of frequencies), consult the catalouge if in doubt.
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