Questions tagged [optical-fibre]

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

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36 views

What is the highest possible optical output power of an SLED?

I am inquiring about this because I'm looking for a suitably high-power, large bandwidth light source for a fibre optic communication system I am designing. The distance the data will be required to ...
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2answers
86 views

Why do simple optical fibers usually support only half-duplex communication?

I'm a newbie to the subject, so a thorough answer would be very helpful. I was curious as to why simple (single) optical fibers usually don't allow full-duplex communication. To my understanding, all ...
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67 views

Can optical fiber communication be used to transmit analog signals?

I am confused because I read the LEDs/LASERS used in optical fiber have finite levels. If for instance ASK is used to transmit digital baseband data then will the LED or LASER be able follow the ASK ...
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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 ...
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1answer
27 views

How do we choose refractive index value in optical fiber design?

It is known that, given two media with refractive indeces \$n_1\$ and \$n_2 < n_1\$, if rays come from medium 1 they will be totally reflected if their angle of incidence is higher than the ...
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2answers
188 views

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 ...
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21 views

Elastic optical network

I am starting to study elastic optical network and I'm confused about the correlation between bandwidth channels supper channels does any one have a pdf file or slide of this subject? thank you so ...
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21 views

What's the name for this extra-slim variation of SMA-905 fiber-side connection?

In the following image the black fiber has 300 μm core and was curled into a ~10 cm loop inside a spectrometer I disassembled, while the blue one has 50 μm core and was supplied as a separate patch ...
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14 views

Q-value in APD photodetector

I try to calculate the Q value of APD photodetector with these parameters: $$R \hspace{0.1in} (response) = 1$$ $$M \hspace{0.1in} (magnification) = 10$$ $$k \hspace{0.1in} (ionization \hspace{0.1in} ...
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1answer
55 views

Detector for a fiber optic gyroscope

I'm a navigation engineer, so I often have to deal with gyroscopes and their measurements. Out of curiosity, I've decided to build one myself and will give it a try with a Fiber Optics Gyroscope (FOG),...
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82 views

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 ...
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How to simulate a MMF fiber in COMSOL Multiphysics?

I am a complete newbie to COMSOL multiphysics, but I have to study and simulate the effects of temperature on multimode optical fibers (MMF) using COMSOL multiphysics for my Bachelor's thesis. I know ...
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2answers
39 views

Different ways or sensors to detect the weight on an object in a system

I am starting to gather information for a project I am excited about; my project is essentially a barbell that can detect the weight loaded on it. I will quickly summarize the function and restraints. ...
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31 views

Transmitting .mp4,.bin,.txt files with on off keying OOK (optical communication)

How do you implement OOK to transmit mp4 files etc. For instance i have LED and a video file to transmit. How do you take the video convert it to binary, send it via the LED recieve it via the ...
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1answer
56 views

Photodiode not working in reverse bias

I'm using a photodiode module, model: coaxial InGaAs, Gtel. I set it in reverse bias with 5V and tested it with a laser but it doesn't give any output voltage. Unfortunately I don't know the laser ...
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2answers
59 views

How optical sources having narrower spectral width gives higher data rates?

How optical sources having narrower spectral width '\$ \Delta \lambda \downarrow \$' gives higher data rates '\$ R_B \uparrow \$'? For example: Laser having lower spectral width gives higher data ...
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1answer
175 views

A few questions about the application of ethernet controller and PHY chip and SFP module

I have a question about the connection/application between the ethernet controller and PHY/SFP modules. Actually, there're so many scenarios for building up a NIC card, which makes me confused. For ...
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1answer
80 views

optical glow fiber for low-tech communication links?

Can cheap "glow" optical fiber (or other inexpensive materials such as aquarium air tubing, etc.) be used for low-tech low-speed optical communications using just simple discrete components, such as ...
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35 views

How to measure the amount of light emitted back from a fiber optic cable?

I would like to build a setup where I use a light source to emit a signal over a fiber optic cable, and then measure the amount of light that is emitted back, e.g. by blocking/opening the other end of ...
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4answers
1k views

How to make affordable DIY low-res absolute rotatory optical encoders with fibers? [closed]

I have zero knowledge of optics and want to make a very low resolution (~10°) absolute rotary optical encoder using rapid manufacturing (I have 3D printers, laser cutter, and desktop CNC). Digging the ...
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0answers
46 views

How to Work with a Optical Fiber Ribbon

I got a piece of fiber optical cable that is in the form of a "ribbon cable" (see pictures). I have seen tools and procedures for making connections on a single strand of optical fiber. I would like ...
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1answer
73 views

Nanopower Fiber Optics / MOSFET Switch

I'm a newbie at designing at the nanopower level, hence my question. In this circuit, I have plastic fiber optical inbound signal that drives D1 photodiode, whose dark current is extremely low (tens ...
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1answer
84 views

Do electronic fiber optic selector switches exist?

From my research, I have been having a tough time finding and specifying a fiber optic selector switch or multiplexer. Do fiber optic selector switches exist? Background - Simple I have an ...
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1answer
42 views

How does a fiber optic receiver converts the optical signal to an electrical signal

A fiber optic receiver needs to convert the incoming optical signal to an electrical signal so it can be sampled. How is this achieved in practice? I believe a photodiode is used, but would a ...
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1answer
32 views

Multimode to singlemode optic fiber

I'm naive in this field, but I will need to use optic fibers for optogenetics application. I already know that my question will sound stupid for the most of you, please forgive me for that. My ...
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1answer
46 views

How come optical data modulation is faster than that of electrical modulation while optical modulation is done by electricity?

why optical data is of high bandwidth that that of electrical copper data bandwidth when we use electrical signal to achieve optical data modulation ?
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1answer
39 views

Optical receiver output voltage higher than power supply

The part is a optical receiver from Broadcom. It has TTL output, but specified with a maximum output-high voltage higher than the power supply. I wonder what's special structure internal may make it ...
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1answer
2k views

Optical bandwidth and electrical bandwidth

I understand the concepts of electrical and optical bandwidths, but I encountered an example problem that used the following formula to calculate the electrical bandwidth: $$electrical bandwidth = 1/\...
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1answer
37 views

Shot noise variance of a channel for different bits

I've come across a question, where I had to calculate shot noise variance calculations of an optical link. As per the definition, shot noise in an optical channel is the current that arises from the ...
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1answer
107 views

Material dispersion in fiber optics transmission

In plain English, why does material dispersion increase with wavelength in fiber optic transmission? I am aware that refraction index decreases with wavelength increase, i.e. pulse travels faster, but ...
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1answer
62 views

How cell sites work? [closed]

In Mobile communication, how do cell sites communicate to each other to the point when they reach the cell site which is connected to the other mobile phone when I make a call . What is the medium of ...
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2answers
1k views

Using SFP modules from a microcontroller

I'm interested in having an embedded device send data optically. This is for test and measurement, where having conductive cables is problematic since it will perturb the measurement. The device is ...
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4answers
197 views

Fiber-optic transceiver ICs for applications other than fiber-optic Ethernet? [closed]

When we talk about fiber-optic transmission, we almost always talk about copper to fiber-optic Ethernet conversion using fiber-optic transceivers. But since fiber-optic communication is just ...
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1answer
201 views

LED strip appropriate for fiber-optic cables

A project will use 20 fiber optic side-glow cables, 3mm-thick, with one controllable LED each. A WS2812 LED strip or similar would be perfect for the ease of controlling the LEDs, however all that I'...
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1answer
49 views

differences between photelectric amplifier and optical amplifier?

i'm researching about fiber optic sensor and stumbled upon a question regarding about the amplifier. I've read in the internet that optical amplififer contained many type such as EDFA,semi-conductor ...
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4answers
21k views

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 ...
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165 views

Low cost low speed fiber optic connection for embedded applications

I would like to use a fiber connection to send data between two nodes. The nodes would typically have a 8 or 32 bit micro controller. I need data rate of 2 Mbps or higher and distance is about 100 ...
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1answer
199 views

What can i use an oscilloscope for in terms of networking [closed]

as someone who is just getting their feet wet in networking (going for a+ cert currently and would like to go further,) ive noticed that oscilloscopes can be used to monitor... seemingly any ...
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1answer
210 views

Direct connection between two SFP+ cables [closed]

I have been reading a lot about modern fiber networking recently and I have a clarifying semi-hypothetical question: Imagine I have two 3-foot sections of Multi Mode Fiber, and four SFP+ 10G ...
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1answer
33 views

Auto Configuring Circuit Routing

This may be a little hard to understand. I have little knowledge in electronics, but I had an idea about optical fiber for data transfer, as far as I understand, ports/inputs/terminals/pins must be ...
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1answer
290 views

How Gigabit Ethernet is achieved in fiber optics?

I understand how 1000BaseT works on Cat 5 cables: It uses clock rate at 125 MHz, 4D-PAM5 data encoding to transmit 2 bit per cycle and it uses the four pairs of the cable. The math is quite simple: ...
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0answers
129 views

How to use Arduino Uno to Process Signal from Leuze LV463 Optical Fiber Sensor

I'm attempting to use an Arduino Uno to receive the output from a Leuze LV463 Optical Fiber Sensor, but I'm a little confused as to which pin to use on the Arduino. The thing that is throwing me off ...
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3answers
7k views

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 ...
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0answers
66 views

Place of matched filter in fiber optic communication

In short-haul communication via optical fibers, we use photodiodes (PD) to detect the light. So if we want to use a matched filter, should we use it before the PD (optical domain) or after the PD (...
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1answer
130 views

Symbol rate and optical bandwidth relation

I am quite new to the field of optical communication, so perhaps this question is so easy. In reading some papers I have faced to the concept of optical bandwidth. For example, they say the symbol ...
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3answers
533 views

What does bandwidth mean in general, and in the context of the following examples?

Some examples : 1.The bandwidth of an operational amplifier 2.The bandwidth of a transmitted amplitude modulated signal 3.The bandwidth of a signal used in coaxial cables / optic fibre cables 4.The ...
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3answers
2k views

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 ...
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1answer
149 views

How to drive a HFBR-1541 optical transmitter?

I want to drive a HFBR-1541 optical transmitter (see page 7; 60mA output current), and I want the driver to have extended operating temperature range (at least starting from -20 degrees Celsius). The ...
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1answer
270 views

How to implement serial-to-fiber optic Ethernet with WIZnet W5500? [closed]

I'm using W5500 to implement a serial to Ethernet converter, but I need to transmit over fiber optic cables. I will have a TX cable and a RX cable. How can this be done since the output of W5500 is ...
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1answer
2k views

C-Band in Optical Fiber Communication [closed]

I've read that the C-Band used in optical communication ranges from 1530 – 1565 nm. Since one nanometer corresponds to 0.000000000299792458 GHZ, this is far less than 1 GHz. However, the C-Band is ...