Questions tagged [fiber-optics]
11 questions
4
votes
2 answers
What does "1/99 tap" mean in a block diagram?
I am still trying to understand the modulator in an optical free space transmitter.
I have found the following block scheme:
It is from "Direct-detection free-space laser transceiver test-bed". I am trying to make clear for me each part of this…
Anna Koroleva
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3
votes
2 answers
How is fiber coupling achieved in communication?
Optical communication with (single-mode) fibers is widespread. Pretty much the complete internet backbone is based on it.
However, I am wondering a bit how the light is coupled into the fibers. Coupling light into a single-mode fiber is a difficult…
cakelover
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2
votes
2 answers
How to attach optical fibre securely to an SMD LED?
I've got a HAT board with five status LEDs I'd like to get somehow extended to the front panel of my system, so that I can read its status without opening the enclosure. the five white rectangles you can see on the picture near the bottom edge of…
Neppomuk
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2
votes
1 answer
Can an SFP+ transceiver be set up without a protocol IC, etc.?
I am looking to use an SFP+ simplex BiDi transceiver in order to replace two 820 nm HFBR Avago modules, one Tx and one Rx. Being an SFP+ module, this seems to require a lot more circuitry to run than the Avagos, which are basically just LEDs.
Can I…
Chalupa
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2
votes
0 answers
Is it possible to convert LVDS (TI DS90c241/124) differential signals to optical signals?
I have a circuit that uses the TI DS90C241 DS90C124 serdes pair to serialize 24bits of data from one board to the other. Either due to electrical interference or the transmission media's characteristics I unable to go beyond 14 MHz of serializer…
deepak
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2
votes
1 answer
Why do dielectric waveguides support hybrid modes and metallic waveguides do not?
Can anyone explain to me qualitatively why dielectric waveguides (core and infinite cladding) support hybrid modes (E_z and H_z components in the guided wave), while metallic waveguides cannot?
I am sure it is about the boundary conditions but I…
1
vote
0 answers
SFP proper address to read length
According to SFF-8472, there are 6 addresses (14 to 19) in table A0 for link length. And when I read a couple of SFP modules trough I2C, I see that more than one of these addresses contain value other than 0.
Example 1, I read value below from a…
August
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0
votes
0 answers
Optical SFP, continuous wave operation
I'm evaluating the suitability of optical SFP modules as a low cost continuous wave source. Is it possible to set optical SFP modules into a CW mode? Can this be done with off-the-shelf racks or is custom code required?
Based on this answer: Using…
0
votes
1 answer
How do single-optical-fiber bidirectional communications work?
In the past, I have dealt with fiber optic network communication devices that utilize two fibers, RX and TX, each being dedicated to one direction. I was under the impression that two fibers are always required for bidirectional…
Ryan Griggs
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0
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Is it possible to have USB communication over fiber optic?
These fibre optic transmitters are up to 125MBd
https://docs.broadcom.com/doc/AV02-2590EN
USB 1 is 12Mbits/s
USB 2.0 is 480Mbit/s
So in theory would be possible to buy 2 of these fibre optic cables and transfer data as USB at speeds somewhere…
AQUAMAN
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0
votes
0 answers
Reflection in optical fiber
I took a measure (OTDR) of optical fiber from the headend and I got this :
In 10.7km The optical fiber have a "reflection". This reflection is holding 500 meters. After that reflection down again in 11.2km.(above 11.2km fiber is cut down).
How can…
NIN
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