Chapter 882 Optoelectronic Data Transmission

Listening to the argument between Han Zhigao and Huo Penghua, Chang Haonan also felt a little dizzy.

Of course, he has done a lot of projects that are implemented at a specific level.

But most of them, whether it is aircraft or aircraft engines, are his old business.

Even if he has never eaten pork before his rebirth, at least he has seen pigs run.

It is naturally not difficult to get started.

And the few that are not counted, such as the previous heavy die forging press and the earlier soft abrasive polishing technology, there are always relatively mature experiences to learn from, and the former even has a semi-finished solution for the overall design.

In fact, he only needs to solve some key problems.

However, what he faces this time is actually a brand new challenge.

Ultrashort pulse laser processing equipment is literally from scratch.

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

Not to mention the engineering level.

Not to mention domestic, there are no precedents for him to refer to abroad.

Only a little bit of exploration.

However, Chang Haonan knew that he couldn't let the two continue to quarrel like this.

There is no problem with normal work collisions, but if you get angry, it will inevitably affect the progress of subsequent projects.

"Team Leader Huo."

He interrupted the argument:

"If we don't consider the limitations of volume and mass for the time being, from a technical perspective, can we meet Team Leader Han's needs?"

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

At most, it can be built directly in Shengjing.

Just treat it as part of infrastructure construction.

This idea made Huo Penghua stunned.

In his career, he has never seen such a strange request.

But thinking carefully, many engineering problems are indeed caused by volume limitations. If you let yourself go in this regard, you can indeed have fewer problems.

And Han Zhigao, who had just been arguing with him, began to seriously consider the possibility of this idea.

In terms of the optical path, 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 be unacceptable just because it changes from 1 meter to 10 meters or 20 meters.

On the contrary, the requirements for the precision of some parts can be reduced.

Everything looks good.

However, Huo Penghua finally shook his head:

"Even if the volume and weight are not limited, the problem of electromagnetic radiation and transmission bandwidth can only be solved at most, but the delay, synchronization rate and loss will still exist, and it may even be more serious due to the increase in volume..."

At this time, Academician Hou Xun also interrupted:

"And many 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 volume of your equipment."

This is basically the final conclusion.

Chang Haonan had to put aside this somewhat unrealistic idea for the time being, and then began to consider other possibilities.

Fortunately, after such an interruption, Han Zhigao and Huo Penghua no longer had the interest to continue the verbal confrontation.

"Technically speaking."

A few minutes later, Huo Penghua spoke again:

"Using static magnetostatic wave devices and superconducting wires is..."

As soon as he said this, the comrade in charge of material support in the third group looked at him with a very unfriendly look, and directly silenced him.

What a joke! If anyone can achieve room temperature superconductivity, they can just wait to win the Nobel Prize.

This is obviously unrealistic.

For a moment, the conference room fell silent again.

"Low loss, large bandwidth, low 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, he suddenly thought of another possibility.

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 present, this statement was a bit awkward, so no one responded at the first time.

So he explained it further:

"I mean, use photoelectron signals instead of electrical signals in the entire system?"

In the moment before he spoke for the second time, Chang Haonan suddenly had an intuition.

So while he was 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 undoubtedly shows...

The idea is feasible!

This gave Chang Haonan full confidence, and he continued:

"The optical carrier frequency is very high, so the signal bandwidth is narrowband relative 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 problem of electromagnetic radiation from the root, and even the electromagnetic shielding layer can be saved..."

In fact, his inspiration also came from his old business--

Since the second decade of the 21st century, some aircraft models with more radical technology have begun to further upgrade the fly-by-wire flight control to optical-by-wire flight control.

The two are similar in principle and design, but use optical fiber instead of traditional cables, which has higher potential in 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 such as radars on the aircraft that rely on electromagnetic radiation. Therefore, if we fully switch to optoelectronic control, we will need a complex electro-optical-electric conversion process. Not to mention radar signals may also be It is 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 use on large aircraft...

It's technically possible.

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

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.

The 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.

The current 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 on the aircraft.

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 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 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 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."

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...technical accumulation in these areas They are all relatively weak and may need us to build them up.”

"Team Leader Huo, I can apply for some more manpower in the optoelectronics field for you, 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 anymore.

"Mr. Chang, Academician Hou, I promise to do my best to complete the task!"

He immediately stood up and expressed his stance.

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 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 has to symbolically solicit other people's opinions.

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

"Well, Mr. Chang, why don't you just ask Penghua to submit one to each of us when submitting project progress statements in the future?"

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 is decided."

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!"