# Tag Info

### Is there any speed difference if we replace a 200-300 meters of copper cables with optical fiber cables? Whats the reason if it increases?

Fiber cables have higher data transfer speed not because light travels faster in a fiber than electromagnetic waves in a copper wire, but because they can be modulated by signals having far higher ...
• 15.1k
Accepted

### Heat loss in Optical Fiber

If you increase the length of the fibre, you will get more reasonable results. The losses -in my mind- need to be distributed along the entire length of the fiber . Currently, you seem to model a very ...
• 24.4k
Accepted

### Calculating Temperature of an Optical Fiber

If a model does not reflect reality, the model is not accurate enough for that situation. Consider some of the minutia in the workings of light. First an alternate model for the fiber: As light ...
• 1,352
Accepted

### Can I use an optical fiber to direct a laser cutter?

CO2 lasers cannot be coupled into standard silica-based fibres, because these fibres absorb light longer than 2.1um. You could use hollow silica fibres, but they are quite recently developed, so might ...
• 1,923

### How to Determine Tensile Strength of PMMA Optical Fiber?

Basically, materials have a tensile strength, and a yield strength. The latter describes how much it elongates under stress, the former how much stress it can have before breaking. It is always given ...
• 1,194

### Utilizing sunlight to illuminate underground spaces through fiber optics

Sunlight has on average a nominal 1000 Watts per meter squared. Ignoring the need to track the sun, this would require a bundle of fibers 1 meter x 1 meter x however meters deep. Making the cost to ...
• 8,201

### Fiber optic Power transmission

Although probably not what you are after, there is Power-over-fiber, which is a technology analogous to "Power-over-Ethernet". To be honest, I haven't seen any devices that take advantage of ...
• 24.4k
1 vote

### Calculating Temperature of an Optical Fiber

Your assumption on temperature increase is flawed You can't convert watts to temperature directly unless the object is perfectly insulated and the application of heat has a limited time. The equation ...
• 7,064
1 vote

### Plus and minus power of Cylinder

Your right eye has a +075 diopters spherical lens combined with a cylindrical with a power of -2.25 diopters and the axis of $180^{\circ}$ or horizontal. Your Left eye has a +1 spherical and a -2.25 ...
• 22.6k
1 vote

### Angle of incidence in concave mirrors

(this is not much of an answer) I assume you are talking about the case where incident parallel rays are not parallel to the principal axis, i.e. To my understanding it is not invariant (i.e. the ...
• 24.4k
1 vote

### Is there any speed difference if we replace a 200-300 meters of copper cables with optical fiber cables? Whats the reason if it increases?

Niels Nielsen's answer is correct. Just to provide some calculations as to actual propagation speeds (not signal bandwidth): Typical optical fibers have $n\approxeq 1.5$ , so the propagation speed is ...
• 4,249
1 vote

### Calculating Temperature of an Optical Fiber

After the exchange of comments, (more specifically) that the glass is transparent, my "guess" is the following: You state that the signal power loss is in the order of 1 W. Assuming the ...
• 24.4k
1 vote

### Fiber optic Power transmission

It depends on the your requirement but yes power can be transmitted through optical fiber. Optical Power can be transmitted through optical fiber like laser diode but the power efficiency is also ...
1 vote

### Could we theoretically use much lower frequencies for fiber optic transmission?

Shorter wavelengths get you into the microwave regime, i.e. use air or vacuum for the "fiber core." Back to optical comms, then: Much of the design parameter space does depend on available ...
• 4,249
1 vote

### Could we theoretically use much lower frequencies for fiber optic transmission?

You want both a laser that is easy to make and a material that can transmit that laser with low losses (transparent) and is also easy to make. Also, for a gut feeling, 1THz is starting to become like ...
• 5,651
1 vote

### What's the difference between pulsed lasers and frequency combs?

A pulsed laser is defined via the difference between phase and group velocity - the frequency $f_{ceo}$ - and the repetition frequency of the pulses - $f_{rep}$. In the frequency domain (because the ...
1 vote

### What's the difference between pulsed lasers and frequency combs?

There is not necessarily any relationship between the two. In theory, a pulsed laser could exist without exhibiting a frequency comb spectrum, and a frequency comb could exist without operating in ...
• 6,436

Only top scored, non community-wiki answers of a minimum length are eligible