Chapter 882 Optoelectronic Data Transmission
Listening to the argument between Han Zhigao and Huo Penghua, Chang Haonan also felt a little bloated.
Of course he has done a lot of projects like this that have been implemented at a specific level.
But the vast majority of them, be it airplanes or aero-engines, can be considered their old profession.
Even if you have never eaten pork before rebirth, you have at least seen pigs running.
It’s naturally not difficult to get started.
And a few that are not included, such as the previous heavy-duty die forging press and the earlier soft abrasive polishing technology, there are always relatively mature experiences for reference, among which the former is even more important than the overall Every design has a half-finished plan.
In fact, he only needs to solve some key puzzles.
However, this time we faced a completely new challenge.
Ultra-short pulse laser processing equipment is literally created from scratch.
Even the theory was picked out bit by bit by him.
Not to mention the engineering level.
Not to mention domestic, there is no precedent for him to refer to abroad.
Just a little bit of fumbling.
However, Chang Haonan knew that the two of them could not continue to quarrel like this.
There is no problem with normal work collisions, but if they get angry, it will inevitably affect the progress of subsequent projects.
"Team Leader Huo."
He interrupted the debate:
"If we ignore the limitations of volume and mass for the time being, and just from a technical point of view, Can it meet the needs of Team Leader Han? "
This type of equipment does not need to be exported. Once built, it is likely to be left in place for more than ten years or even longer, so it does not matter even if it is large. .
At most, it is possible to go directly to Shengjing and build it in situ.
Just treat it as part of the infrastructure construction.
Huo Penghua was stunned by this idea.
Never in his career had he seen such a strange request.
But if you think about it carefully, many engineering problems are indeed caused by size limitations. If you let yourself go in this regard, you can indeed avoid a lot of problems.
And Han Zhigao, who had been arguing with him just now, also began to seriously consider the possibility of this idea.
As far as the optical path is concerned, although the increase in the size of the equipment will lead to a longer propagation distance, this is not a problem for lasers. Scattering and attenuation will not change from 1 meter to 10 meters or 20 meters is unacceptable.
On the contrary, the accuracy requirements for some parts can be reduced.
Everything looks great.
However, Huo Penghua finally shook his head:
"Even if the volume and weight are not limited, at most it can only solve the problems of electromagnetic radiation and transmission bandwidth, but delay, synchronization rate and loss will still exist, and may even become more serious due to the increase in volume..."
At this time, Academician Hou Xun also stepped in:
“And a lot of electronic leakage, noise and distortion are not caused by the transmission process, but by the signal conversion process. This has nothing to do with the size of your equipment. It doesn’t matter much.”
This is basically the final conclusion.
Chang Haonan had no choice but to put aside this somewhat counterintuitive idea for the time being, and then began to consider other possibilities.
Fortunately, after such an interruption, Han Zhigao and Huo Penghua lost interest in continuing the verbal confrontation.
"Technically speaking."
A few minutes later, Huo Penghua spoke again:
"Using magnetostatic wave devices and superconducting wires is..."
As soon as he said these words, the comrades in the third group responsible for material security looked at him with a very unkind look and silenced him.
Come on, if anyone can achieve room temperature superconductivity, they can just wait and win the Nobel Prize.
Obviously unrealistic.
For a while, the conference room became quiet again.
"Low loss, large bandwidth, small radiation, high resolution..."
Chang Haonan listed a series of requirements for the entire data signal processing process on the notebook in front of him.
Then, another possibility suddenly occurred to me.
A brand new possibility.
“What if we modulate the signal onto light?”
Chang Haonan’s words suddenly broke the silence.
However, even for the experts here, this statement is a bit awkward, so no one reacted immediately.
So he explained further:
"I mean, using optoelectronic signals instead of electrical signals in the entire system?"
Before he spoke for the second time At that moment, Chang Haonan suddenly had an intuition.
So while speaking, he threw the overall idea to the system for verification.
Although this idea is not perfect, it requires an extremely high number of scientific research points to improve it.
But this shows without a doubt that...
The idea is feasible! This made Chang Haonan immediately full of confidence, and he immediately continued:
"The optical carrier frequency is very high, so the signal bandwidth is narrowband compared to the carrier frequency. The transmission characteristics of the line are inherently more stable, and optical fibers are used to transmit signals. Compared with traditional coaxial cables or waveguides, the loss rate is almost negligible, and there is no problem of electromagnetic radiation at all. Even the electromagnetic shielding layer can be omitted..."
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In fact, his inspiration also came from his old profession——
Starting from the second decade of the 21st century, some technologically radical aircraft models began to further upgrade fly-by-wire flight control to optical-wire flight control.
The two are similar in principle and design, but use optical fiber instead of traditional cables, which has higher potential in terms of aircraft weight reduction and signal feedback efficiency.
Previously, Chang Haonan even considered whether China's aircraft design could skip telex and directly enter the era of optical transmission.
Only after careful consideration, there are still a large number of signal sources such as radars on airplanes that rely on electromagnetic radiation. Therefore, if we fully switch to optoelectronic control, we will need an additional complicated electro-optical-electric conversion process. That said, radar signals may also be further contaminated by optical path noise or interference, resulting in new distortions and distortions.
In general, it is too difficult to use on small aircraft.
As for using it on large aircraft...
It is technically feasible.
For example, the P1 anti-submarine aircraft was the first model in the world to use optical transmission flight control.
But not to mention that China does not have a serious large aircraft on hand. Even if it does, large aircraft are not sensitive to weight, volume and control efficiency, and it seems difficult to take advantage of the light control system.
P1’s optical flight control is also more of a technical verification.
So this idea was put aside for the time being.
But then again.
At present, this laser processing equipment does not rely on electromagnetic radiation to work. On the contrary, its core equipment is a set of light sources.
Although high-energy laser beams and optoelectronic signals are completely different, at least the electrical-to-optical-to-electrical conversion system that must be on the aircraft is eliminated.
Overcome once and for all...
Well, not actually overcome.
It should have bypassed the two biggest problems.
At the same time, after a short period of thinking, other people in the conference room also gradually realized the feasibility of this plan.
Especially Huo Penghua.
“It seems that’s more than that…”
His eyes gradually brightened:
“Because of the characteristics of ultra-short pulse laser, we need a very high-frequency control signal to meet the needs of high-precision processing, and the low loss of optical fiber has nothing to do with frequency, so high The frequency signal can be transmitted directly in the link in its original form without the need for down-conversion or digitization, and it can also save two rounds of signal conversion process..."
As Academician Hou said just now, the signal conversion process produces The adverse effects are difficult to eliminate.
But now we are cutting all corners and cutting off two parts of this process, which is naturally a blow to dimensionality reduction.
“But this also means that we need to start from scratch and redesign a whole set of components related to optoelectronic signals.”
Academician Hou said and looked at Huo Penghua at the other end of the conference table:
"Penghua, the burden on you is even heavier."
Not waiting for the latter to respond. , Chang Haonan added:
“It’s not just a problem of components.”
“Related foundations of optoelectronic transmission, such as modeling of optical switch characteristics, optical switch delay network The switching crosstalk, delay error, and the impact of these crosstalk and errors on the array pattern and pulse compression... The technical accumulation in these aspects is relatively weak, and we may need to establish it.”
"Team Leader Huo, I can apply for some more manpower in the optoelectronics field for you, but considering the nature of the project, the number should not be particularly large." There is no second way in front of Huo Penghua.
Furthermore, compared with the traditional technical route that has no way out at all, the future of optical transmission systems at least looks bright.
As for how twisty the road is...
I can’t care less about it now.
"Mr. Chang, Academician Hou, I promise to do my best to complete the task!"
He immediately stood up to express his position.
Chang Haonan nodded with satisfaction upon seeing this. After thinking for a moment, he looked at Academician Hou on his left:
"Academician Hou, the task of Team Leader Huo is indeed very heavy. And the theoretical research on my side is progressing relatively smoothly, so I am thinking that maybe you can transfer the progress of Team Leader Huo to me? "
Actually, he is the one? Prepare to bypass the latter and take Huo Penghua's R&D team directly into your hands.
After all, although Chang Haonan didn't have enough scientific research points to complete the entire project directly, if Huo Penghua could provide specific problems and ideas, it would be no problem to guide the specific research and development path.
It’s just that Hou Xun, as an academician after all, still needs to symbolically solicit other people’s opinions.
Of course Academician Hou also understood the meaning behind this sentence, so he followed suit:
“Let’s do it, Mr. Chang, just ask Penghua to give it when submitting the project progress statement in the future. Let’s each submit one?”
We are all decent people.
As the project leader, Chang Haonan still has the final say.
Others respect him, but he has to hold it in check.
"Well, the next task has been decided."
Chang Haonan breathed a long sigh of relief and glanced at the dozen core members attending the meeting in front of him:< br>
"Team Leader Huo will stay alone after the meeting, and we will discuss more specific research and development issues."
"Others...dismissal!"
(End of this chapter)