Laser to be used in fiber optics

In summary, the general rule for deciding which lasers can be used for fiber optic communication is that they must have a wavelength that is suitable for the specific fiber being used. Most common communication fibers run at 1.55um and have good transmission and low dispersion around this band. The UV lasers listed in the choices may have difficulty transmitting through glass fibers, so it is important to consult the catalog for the optimal bandwidth of each specific fiber.
  • #1
CL39
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Homework Statement



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




Homework Equations





The Attempt at a Solution

 
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  • #2
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.
 
  • #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.
 

1. What is a laser and how is it used in fiber optics?

A laser is a device that emits a highly concentrated beam of light. In fiber optics, lasers are used as the light source to transmit data through the fiber optic cables. The laser light is converted into electrical signals that can carry data over long distances at high speeds.

2. What types of lasers are commonly used in fiber optics?

The most commonly used lasers in fiber optics are semiconductor lasers, such as diode lasers and vertical-cavity surface-emitting lasers (VCSELs). These lasers are compact, efficient, and can emit light at specific wavelengths that are ideal for fiber optic communication.

3. How does the power and wavelength of the laser affect fiber optic communication?

The power of the laser determines the strength of the signal that is transmitted through the fiber optic cable. Higher power lasers can transmit data over longer distances. The wavelength of the laser is also important, as it determines the type of fiber optic cable that can be used. Different types of fiber optic cables are designed to work with specific wavelengths of light.

4. What are the advantages of using lasers in fiber optics?

Using lasers in fiber optics offers several advantages. They can transmit data at high speeds, over long distances, and with minimal loss of signal. Lasers are also smaller and more efficient than traditional light sources, making them ideal for use in compact fiber optic systems.

5. Are there any safety concerns with using lasers in fiber optics?

Yes, there are some safety concerns when working with lasers in fiber optics. Lasers emit high-energy light, which can be harmful to the eyes and skin. It is important to follow proper safety protocols and wear protective gear when handling lasers. Additionally, lasers should only be operated by trained professionals to minimize the risk of accidents.

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