The Military-industrial Scientific Research System of the Academic Master Chapter 882

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, are considered their own profession.

Even if you have never eaten pork before being reborn, you have at least seen pigs running away.

It's naturally not difficult to get started.

And a few that don't count, 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 them, the overall design of the former is even semi-finished. plan.

It actually just requires him to solve some key puzzles.

However, what we are facing this time is actually a completely new challenge.

Ultrshort pulse laser processing equipment is literally created from scratch.

Even the theory was picked out bit by bit by him.

Let alone the engineering level.

Leave it alone domestically, 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.

Normal work collisions are okay, but if they get angry, it will inevitably affect the progress of subsequent projects.

“Team Leader Huo.”

He interrupted the argument:

“If the volume and quality limitations are not considered for the time being, can it be achieved from a technical perspective alone to meet the needs of Team Leader Han?”

This type of equipment does not need to be exported. Once built, it will most likely be left in place for more than ten years or even longer, so it does not matter even if it is large.

The most you can do is go directly to Shengjing and build it in situ.

Just treat it as part of the infrastructure construction.

This idea made Huo Penghua stunned.

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.

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 become unacceptable just because it changes from 1 meter to 10 meters or 20 meters.

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 intervened:

“And a lot of electronic leakage, noise and distortion are not caused by the transmission process, but by the signal conversion process, which has little to do with the size of your equipment.”

This is basically the final conclusion.

Chang Haonan had no choice but to put aside this somewhat outrageous 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:

“The use of magnetostatic wave devices and superconducting wires is...”

As soon as he said these words, the comrades in the third group responsible for material support looked at him with a very unkind look and silenced him.

What the hell, 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 new possibility.

“What if we modulated 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 it further:

“I mean, using optoelectronic signals instead of electrical signals throughout the system?”

The moment before he spoke for the second time, 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 be perfected.

But this leaves no 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 the loss rate of using optical fiber to transmit signals is almost negligible compared to traditional coaxial cables or waveguides. There is no fundamental problem of electromagnetic radiation, and even the electromagnetic shielding layer can be omitted..."

In fact, his inspiration also came from his old profession—

Since the second decade of the 21st century, some technologically radical aircraft models have begun to further upgrade their fly-by-wire flight controls to optical-wire flight controls.

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.

But after careful consideration, there are still a large number of signal sources on the aircraft that rely on electromagnetic radiation, such as radar. Therefore, if we fully switch to optoelectronic control, we will need an additional complex electro-optical-electric conversion process. Not to mention radar signals may also be It is further contaminated by optical path noise or interference, thereby producing new distortions and distortions.

Generally speaking, it is too difficult to use on small aircraft.

As for use on large aircraft…

It is technically feasible.

For example, the first model in the world that applied optical transmission flight control was the P1 anti-submarine aircraft.

But let's not 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, they at least eliminate the need for an electrical-to-optical-to-electrical conversion system that must be present on an aircraft.

Overcome once and for all...

Well, actually I haven't overcome it.

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 ultrshort pulse lasers, we need a very high-frequency control signal to meet the needs of high-precision processing. The low loss of optical fiber has nothing to do with frequency, so high-frequency signals can be transmitted directly in the link in their initial form. No down-conversion or digitization is required, and two rounds of signal conversion processes are eliminated…”

As Academician Hou said just now, the adverse effects caused by the signal conversion process are difficult to eliminate.

But now we are directly removing the firepower 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.”

Before the latter could respond, Chang Haonan added:

“It's not just a matter of components.”

"Related foundations of optoelectronic transmission, such as modeling of optical switch characteristics, switching crosstalk of optical switch delay networks, delay errors, and the impact of these crosstalk and errors on array pattern and pulse compression... The accumulation of technologies in these areas are all It's relatively weak and we may need to build it up.”

“Leader Huo, I can apply for some more manpower in the optoelectronics field, but considering the nature of the project, this number should not be particularly large.”

Having said that, there is no second way before 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 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 tasks on Team Leader Huo's side are indeed very heavy, and the theoretical research on my side is progressing relatively smoothly, so I'm thinking that maybe you can transfer the progress on Team Leader Huo's side to me. One portion?”

In fact, he was planning to bypass the latter and take Huo Penghua's R&D team directly into his own hands.

After all, although Chang Haonan did not 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 as an academician, Hou Xun still needs to symbolically solicit other people's opinions.

Of course Academician Hou understood the meaning behind this sentence, so he followed suit:

“How about this, Mr. Chang, let Penghua submit one to each of us when submitting project progress reports in the future?”

We are all decent people.

As the project leader, Chang Haonan still holds the decision-making power.

Others respect him, but he has to hold it in check.

"Well, the next task is settled."

Chang Haonan breathed a long sigh of relief and glanced at the dozen core members attending the meeting in front of him:

“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)

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