Calculate Power & Energy Loss in Optical Fibre: 0.8dB/km @ 1250nm

In summary, the conversation is about calculating power loss in an optical fiber. The initial question is posed about the amount of power lost at a distance of 20km down the fiber, and the energy loss over a 24-hour period. The conversation then moves on to discussing the meaning of 0.8 dB and how it relates to power. A reference is provided for further understanding of dB and power relationships. Overall, the conversation is focused on understanding and solving the problem of power loss in an optical fiber.
  • #1
aero_mech13
1
0
Hi guys,

can anyone help me with this question?-

An optical fiber has a loss of 0.8dB/km at a wavelength of 1250nm. If 120uW of power is injected into the fibre at the transmitter, how much power would be lost at a distance of 20km down the fibre, also calculate the energy loss over a 24hr period?

Regards
 
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  • #2
What's the meaning of 0.8 db? If you're not sure, review here: http://hyperphysics.phy-astr.gsu.edu/hbase/sound/db.html"
 
Last edited by a moderator:
  • #3
Welcome to the forums,

Have you made any attempt at this question yourself? My first suggestion would be to figure out how dB relates to power...

Edit: This is getting to be a regular occurrence Doc :redface:
 
  • #4
Doc Al is putting you on the right track. But his dB reference may be confusing to someone just learning about power relationships. Here's another reference to shed more light. You will see some examples relating power.
 

Related to Calculate Power & Energy Loss in Optical Fibre: 0.8dB/km @ 1250nm

What is the formula for calculating power loss in optical fibre?

The formula for calculating power loss in optical fibre is: Power Loss = 10^(dB loss/10) x Power Input

What is the significance of 0.8dB/km in optical fibre?

0.8dB/km is the attenuation coefficient of the optical fibre at a specific wavelength (1250nm). It represents the amount of power loss per kilometer of fibre length.

How do you calculate energy loss in optical fibre?

To calculate energy loss in optical fibre, you can use the formula: Energy Loss = Power Loss x Time. This takes into account both the power loss in the fibre and the duration of time over which the loss occurs.

What factors can affect power and energy loss in optical fibre?

The main factors that can affect power and energy loss in optical fibre include the length of the fibre, the type of fibre used, the wavelength of light being transmitted, and any external factors such as bends, splices, or connectors in the fibre.

How can power and energy loss in optical fibre be minimized?

To minimize power and energy loss in optical fibre, you can use higher quality fibres with lower attenuation coefficients, use shorter fibre lengths, and ensure that all connectors and splices are properly aligned. Additionally, using signal amplifiers and choosing the appropriate wavelength for transmission can also help to minimize loss.

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