Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [optical-fibre]

A flexible, transparent, fine fibre made of extruded silica to function as a wave guide to transmitting signals through light

Optic fibers are largely used on communications, presenting the following advantages over regular copper wires:

  • Greater bandwidth on a significantly thinner cable, thus costing less.
  • Immune to electromagnetic interference.

Since the light travel along them, they're also used on many lighting applications, generally grouped in bundles.

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How is 255 Tbit/s processed in optical fiber communication?

I have never understood how the new record breaking data transfer speeds are achieved in terms of converting from/to electrical and optical signals. Suppose we have 255 Tbits of data and we want to transfer it in one second. (This is a real world…
stevie
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What are these teardrop-shaped loops in power lines for?

I just happened to notice this along a road near where I live: So these were in a pair, oppositely facing, "tip" to "tip" of the teardrop. At first glance, this doesn't seem to be a bird diverter like here. What is it for? Note - I wrote "power…
StayOnTarget
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What is the advantage of optical TOSLINK over RCA coaxial cable?

A popular standard for the transmission of digital audio between audio devices has been the AES3 standard (also known as S/PDIF). The standard sends stereo PCM audio and of often found in consumer electronics. The standard specifies multiple…
nabulator
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Why does a longer fiber optic cable result in lower attenuation?

I just carried out an experiment in my college to study the attenuation of fibre optic cable versus length and type of cable. This experiment was carried out with an LED light source and a power meter connected at the other end. The wavelength is…
hellojoshhhy
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Does Fibre Optic Cabling have any potential for noise?

After Google searching "Do Fibre Optic Cables attract any noise", most results return that they attract virtually no noise. Is this the case or are there some exceptions?
Oliver Kuchies
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Implement send-only (one-way) Ethernet cable

I want to build a unidirectional comminucation. In transportation layer of this device, it needs a one-way media to send data from side A to side B. All commercial products use SFP. I tested some SFP devices but they have negotiation between the two…
M-Razavi
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Why do we have a limited bandwidth in electronics?

I've been looking around a bit on optical communications and it is said that the main advantage in using optical communications, namely optical fibers, lies in the gigantic bandwidth available, when compared to the few GHz that electronics can…
Bidon
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Optical TOSLINK for high voltage isolation up to 2kV?

When using optical TOSLINK cable for isolation, would there be a problem in using it for measurements up to 2kV? I don't envisage any problems, since the optical cable is made of non-conducting material and is over 1m long, so creepage shouldn't be…
mr_js
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Using QSFP28 Module at Lower Lane Rate

I have an application that requires optical transmission of 4x16 Gbps SERDES lanes over fiber. A QSFP28 module for 100G ethernet seems like a great commercial solution--it can take the four lanes and combine them over a single fiber channel. The…
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Do we use any filter after photodiode?

In wireless communication, we use a matched filter to suppress out-of-signal-space noise. After this filtering we do sampling. Otherwise, the power of noise is infinite (practically very large). In short-haul fiber-optic communication systems…
CLAUDE
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what is the span of an optical fiber?

I am new to the fiber-optic communication systems, and in reading some relevant papers, I faced to the term "span length" (such as long-span link) which I cannot distinguish it from the length of the cable. For example in one of the figures, it has…
CLAUDE
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Convert dB/km to /km

please explain How is 0.22 dB/km equal to 0.0507 km^(-1) I tried doing 10 log x = its value in dB but it doesn't work here
SaJ
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Low cost UART over fibre

I need to extend an existing 5V UART over fibre for isolation reasons. Digital isolators / optos are no good as I need more isolation than that (0.1pF coupling max. from one side to the other). UART content is fixed due to backward compatibility…
stefandz
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What grade of fibre is used in optical fibre displays?

Optical Fibre displays such as Fibre Optic Trees probably isn't going to use cable designed for 10GBase-ER. So what grade of fibre is used in these displays? Clearly, it can't be terribly expensive. What are the limitations of this type of fibre?
Damien
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Insulation safety ratings (working and withstand voltage) of fiber optics cables

I'm trying to build a high voltage optocoupler to implement galvanic isolation between a high voltage supply and its control signals. Since the working voltage is several kilovolts, it's beyond the ratings of all isolation ICs. Thus, the plan is to…
比尔盖子
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