Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [optics]

Anything related to optics applied to electronics. Optics is a branch of physics studying the properties of light and its interactions with physical media.

Anything related to optics applied to electronics. Optics is a branch of physics studying the properties of light and its interactions with physical media.

See also Wikipedia on optics.

149 questions
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Are optical fibers full duplex?

Can optical fibers transmit in both directions simultaneously? Both single mode fibers and multi mode? What about if they we choose non-interfering wavelengths?
Jader Dias
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Text Projection in Smart Glasses

Say I have a pair of glasses such that each lens is densely pixelated and each pixel can be controlled to block (or attenuate) light coming through. Can I use this technology to project text (say "Hello World") to appear 10 meters away? Or do I also…
TomY
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Modding a CD ROM drive to read DVDs?

I've came across this tutorial purpotedly claiming to allow a CD ROM drive to read DVDs by changing the track pitch of the laser head on the drive; http://www.haklabs.com/2007/modify-your-cd-rom-to-watch-dvd-movies/ Wikipedia states: "DVD uses 650…
Sam Muesli
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Would optical signal processing still suffer from slew rate?

In electronics, analog signal processing/computation suffers from parasitic capacitance which leads to slew rate—which is the maximum rate of voltage change allowed, so handling super-high frequency becomes impossible. Is this still true for optical…
NCL
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dBo and dBe in relation to Watts

I would like to know the difference between dBo and dBe in relation to dBm. Does fiber optics have a specific matching impedance like the 50 ohm reference? Is this just a convention or is there an equation that specifies dBo for optics and photons…
tbjohnson19
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Optical interconnects

What are the challenges involved in using optical interconnects? As they are efficient than copper interconnects in many aspects like power consumption and data rates, what is preventing using from using optical interconnects?
Murali Krishna Reddy
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Why do optical interconnects require less power than electrical?

Why is it that optical interconnects require so much less power than electrical ones? update from comments: This question was prompted by this video. The speaker shows a table at 50:43 that indicates that optical interconnects require much less…
okarin
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Toslink (fiber optic) connectors not working

I built this quick test circuit before I start implementing a switch with multiple receivers and it isn't working correctly. The transmitter appears to be working (I can see the red light on) but when I connect my stereo receiver to the transmitter…
user2665581
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Specificity? "High-Contrast and spectroscopic-based specificity of optical imaging."

I came across the following phrase: High-Contrast and spectroscopic-based specificity of optical imaging. I'm wondering what is meant by "specificity" in this context? Thanks for any clarification.
The Pointer
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detect optical transceiver transmit wavelength

Let's say there is a no-name SFP transceiver without a label and without DDM(allows to see manufacturer programmed wavelength data on EEPROM from network device) support. Is it technically possible to detect on what wavelength this SFP transmits? I…
Martin
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Phased array spectrophotometer for coherent and incoherent visible light

What is the principle of operation for a phased array spectrophotometer for coherent and incoherent visible light? I read this recent article about:…
Frank
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Optical Coupler

i have two modems, each modem Tx signal is converted to fiber optics. can I combine the two Tx signals (signal A and signal B) with an optical coupler? At each time data is transmitted by only on one of the modem Tx so that when : A transmitting…
Alex V.
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How can I measure the brightness of a LED?

I'm interested in converting voice of the customer (VOC) to LED brightness specification. In order to do this, I would like to be able to measure LED brightness using a cost effective instrument. What are the available instruments to measure LED…
Mahendra Gunawardena
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Is NeoPixel used in Amazon Echo series?

Is it true that NeoPixels are used in Amazon Echo series? If so how many NeoPixel LED's are used? If so what are the optics used to give a smooth streak of colours?
iamnagaky
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speed of light measurement

u can video call one smartphone from another via wireless internet connection, ie: the signal travels from one device to a satellite and then to the other device. but i want to avoid network noise and fluctuations, could i do the same thing but…
POL
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