Technological breakthroughs make it easier for people to lay optical fiber at a long distance

Technological breakthroughs make it easier for people to lay optical fiber at a long distance

The broadband frequency comb ensures that the crosstalk between multiple communication channels in the same optical fiber can be eliminated.

For a long time, one of the major problems with optical fiber is that the more energy you add to the signal, the more serious the distortion you encounter, so that the signal can be transmitted farther. This distortion will reduce the data quality.

This is a problem because, ideally, you want the optical fiber to be laid remotely. The cost of laying a long optical fiber cable is lower than that of laying multiple optical cables and using the added repeater. The latter is what we usually use today.

Interpreting data 12000 kilometers away

But scientists think they have found a solution.

Researchers at the University of California, San Diego, said they have been able to send data along a 12000-kilometer fiber without using relay, but still can interpret information 12000 kilometers away.

But they do use standard amplifiers.

However, they said their experiments prove that you can eliminate costly regeneration relay. They do this by eliminating distortion.

The research team published research results in the Journal of Academic Research Science.

Predictable Crosstalk

This concept is very simple. Researchers believe that the signal distortion caused by crosstalk is predictable. The university claims in an article on its official website that, as a result, signal distortion "can be eliminated at the receiving end of the optical fiber ".

Crosstalk refers to interference between multiple channels in the optical cable. The signal transmitted in one circuit will affect the other circuit-the signal will overflow. The researchers said they knew the impact, so they were able to eliminate the impact and thus eliminate distortion.

Pre-distortion waveform

The photon research team has achieved results using physical principles. The pre-distortion waveform is printed on the carrier that generates the frequency comb at the origin end. Then, no loss information is restored at the output end of the optical cable.

Bill Kuo, a research scientist at Qualcomm Research Institute, said: "We are moving ahead of the distortion in the fiber ." Kuo is responsible for frequency carding research and development, and is also one of the authors of the study group's papers published in Science.

Elimination Technology

Elimination technology has become more common in general. Some scientists are trying to use algorithms to Eliminate Self-Interference in the radio.

In this case, this is a low-cost processing capability that allows more complex mathematical operations and formulas to run at the first time. Algorithms become easier to obtain.

Radio

Scientists in the radio field are developing self-interference elimination technology to make more effective use of the spectrum. The idea is that if you can predict how transmission is affected by its own interference, it can eliminate and eliminate interference.

Over the years, this basic concept has been applied to the noise elimination headset technology. When the headset hears unnecessary noise, it does not synchronously simulate the noise and then eliminates the noise.

I have previously written an article about radio and interference elimination algorithms, interested friends can look at: available frequency is expected to double because of self interference elimination algorithm (http://www.networkworld.com/article/2599403/wireless/available-spectrum-will-double-with-self-interference-canceling-algorithms.html ).

Broadband Carding

Taking Optical Fiber crosstalk elimination as an example, broadband frequency combs can eliminate crosstalk in the same optical fiber.

Nikola Alic, another research scientist and author at Qualcomm Research Institute, said: "Today's optical fiber systems are a bit like quicksha. As for quicksand, the harder you struggle, the faster you sink ."

If you use the traditional "optical fiber, to a certain extent, the more energy you add to the signal, the more serious the distortion you encounter, which actually prevents people from laying the optical fiber farther ."

Once the new research results are put into practice, it is expected to solve this problem. Therefore, you do not need to install an electronic Reactor (also called a repeater) along the fiber link, thus saving a lot of costs.