"Propagation of light pulses with intermodal dispersion in multimode fibers, MMF. Words are mapped to different frequencies (different colors), the optical pulses are stretched into different temporal dispersion curves. This allows for the identification of the pulse frequencies at the receiver, thereby enabling the reconstruction of the input words. Credit: Gao, Z., Jiang, T., Zhang, M. et al." (ScitechDaily, Scientists Just Taught Light to Transmit Meaning – And It’s Revolutionizing Communications)
There are many ways to make light-based communication systems. Normally, we think that the light flashes mean 0 and 1 in a laser communication system. But the 0 and 1 can be two different wavelengths. That means the flash of red can mean 1, and the flash of green can mean 0. This is a useful tool for binary data transmission. But there is one way to transmit data by using light that we don't usually mention.
In that version, a single wavelength means a single word. The system must only give serial numbers for light- or radiation flashes. Then the receiver can put those flashes back into a certain order. That means red can mean "if", green can mean "and" etc. Researchers can also use radio waves in the same way as lasers. And the point of the CCD camera those people can put a radio spectral scanner.
There are approximately 600000 words in English. Some people might think to use that kind of data transmission, the system requires 600000 wavelengths. The system can send those messages by blinking the colored lasers in the order that gives words to the receiver. If one color carries one word that makes the system immune to disturbance.
"Experimental system. a, encoding: Each word is mapped to an optical frequency according to the encoding table. b, Schematic of the experimental setup. c, decoding: Recognize each dispersion curve as the corresponding frequency using the fingerprint dictionary, and then reconstruct the words based on the encoding table. d, implement sentiment analysis using a deep learning model. Credit: Gao, Z., Jiang, T., Zhang, M. et al." (ScitechDaily, Scientists Just Taught Light to Transmit Meaning – And It’s Revolutionizing Communications)
The problem is that. Language advances all the time. And the system requires very advanced and complicated transmitter-receiver pairs. But theoretically is possible to create a CCD camera that pixels can separate 600,000 frequencies. And, a transmitter can also have the ability to send 60000 separated frequencies.
And that means the system must have flexibility. If the system uses the English alphabet. It needs only 52 frequencies for the letters. There are 26 capital and 26 lower cases. And other frequencies for numbers and special marks like brackets. Or the sender can use the words to send numbers. But that creates limitations in massages.
The system can use red as "A" and the light flashes can involve data which place the certain letter takes in the words. That thing is hard to jam.
So it's immune for the outcoming errors. But otherwise, it's easy to break.
The system can also encode lots of words in one wavelength. There can be hundreds of words encrypted in certain colors. The system must only send the serial number of the word that the system sends. This kind of system is more complicated to break. That thing makes this thing more vulnerable to disturbance.
https://scitechdaily.com/scientists-just-taught-light-to-transmit-meaning-and-its-revolutionizing-communications/
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