Military Industry of Great Powers: Build the Strongest Flanker

Chuan Aiguo is right. Chinese people in this era are full of pioneering spirit.

No matter how rudimentary the conditions are, no matter how out of touch with the world, these scientific researchers, many of whom have never experienced higher education, rely on primitive tools to keep China's science and technology from lagging far behind the world, and even in some fields, it has been Be in the leading position.

Along the way, Dean Zhang Shitao talked about their time in 1968.

"At that time, when I was still in the May 7th Technical School, Tang Chunbao found a crucible when he was sorting out the warehouse, which made us very happy. We used this crucible to try to purify quartz and heated it with an alcohol lamp.

At that time, chemistry was not good and there were no raw materials, so we found a piece of talc. Old Tang said that talc also contains silicon. Because the temperature was not enough, the talc Mg3(Si4O10)(OH)2 would not react at all when heated, and we could not get what we wanted. Silica.

It’s difficult because most leaders don’t understand optical fiber communications and regard optical fiber communications as a dispensable small project. Therefore, we only received 300 yuan in funding and only a few people, such as Huang Dingguo, glass worker Tang Renjie, and a chemistry teacher Shi Qing. There is no formal laboratory, so we do chemical experiments in the cleaning room next to the toilet in the laboratory building. "

Zhao Guoqing asked: "What happened next?"

Tang Baoguo on the side laughed and said: "Then one day, Dean Zhang found a bottle of SiCl4. We didn't know the properties of SiCl4, so we wanted to save materials and pour less for experiments. Dean Zhang didn't know that SiCl4 would boil at room temperature. SiCl4 As soon as he fell down, he hit his right eye."

"Old Tang, let's talk about the important point, this matter... haha..." Zhang Shitao laughed to himself,

No wonder Teacher Xiao Zhao couldn't laugh when he saw Dean Zhang's right eye blinking habitually.

Tang Baoguo continued: "The chlorine gas produced at that time caused me to faint and fall to the ground. Colleagues sent cars to the hospital for rescue, but the doctors didn't know how to save me. When I got to the hospital, I woke up and heard Lao Zhang say: What the hell? Yeah, I'll flush my eyes with distilled water and give him a drip, but he won't die."

Zhang Shitao took a long breath and said: "Our understanding of quartz for making optical fibers is too superficial. So, I asked Huang Dingguo and Lao Tang to visit quartz factories in Shanghai and Shashi, and they learned that smelting quartz requires 1400℃~2000℃. For high temperatures, use a hydrogen-oxygen flame.

We use the so-called MCVD method, a modified in-tube chemical deposition method, to create ultra-pure quartz. By 1975, we had designed a distillation tower to remove metal impurities, and then used an adsorption tower to remove volatile organic compounds, and we could produce high-purity quartz with a purity of nine-nine. "

The purity was ninety-nine. Teacher Xiao Zhao couldn't help but applaud. It was amazing.

"In 1976, the Ministry of Posts and Telecommunications organized an exhibition and asked its subordinate departments to provide new technology exhibits. The exhibits at the Wuhan Post Institute included our optical fiber communication demonstration. I used the 16m optical fiber we developed and the laser provided by the Shanghai Optical Machinery Institute as the light source. The communication system is a pulse phase modulation system I designed, which transmits a black and white TV."

"On the day of the preview, then Minister Zhong of the Ministry of Posts and Telecommunications came to visit and inspect our equipment and saw our optical fiber communication demonstration."

"Minister Zhong was very surprised. He asked me to stand aside. He wanted to personally remove the optical fiber to see if it was blocked, and then put the fiber back himself to see if it was connected again. He obviously didn't believe it!"

"I told him: It would be impossible to remove it, but it couldn't be put back, because we don't have a precise fine-tuning mechanism, so we just use screws and plasticine instead. It took me half an hour to get the signal right."

Zhao Guoqing almost laughed out loud when he heard this. Dean Zhang was too talkative. Just listen to him continue: "But the minister must do it himself. I told him: Can you come next week?"

"After I went back, I used a large-area light detector, which was easy to match. Sure enough, a week later, Minister Zhong came, and he still asked me to stand aside. He personally removed the optical fiber. As a result, the black and white TV failed, and he personally After connecting the optical fiber and restoring the TV, Minister Zhong smiled and left..."

"About two weeks later, the Wuhan Post Office received a communication from the Ministry of Posts and Telecommunications - Optical fiber communication has become a key project of the Ministry of Posts and Telecommunications!

You must know that optical fiber communication was not a key project of the institute before, but now it has suddenly become a national key project. "

Zhao Guoqing said: "Learn from the comrades of the Wuyou Academy!"

Dean Zhang shook his head and said: "WPU has established an optical fiber production workshop and factory, established an optical device research institute, developed and produced lasers, expanded the scale of original research and production of communication machines, developed digital communications, and developed PCM pulse coding communication machines. , the institute has canceled all other projects, including millimeter wave communications, fax and telegraph, etc. Eight years ago, our Wuhan Postal Institute opened an optical fiber communication experimental line and conducted call experiments..."

"Director Zhao, you know, when we received the news about the optical module developed by Institute 101, we didn't believe it at first. We didn't believe it until we learned about the glorious deeds of Institute 101. I didn't expect that you also developed EDA software, and The chip factory is amazing, really amazing!”

Zhao Guoqing pointed to the door of the Optoelectronics Research Laboratory and said to Dean Zhang: "Dean Zhang, please stop boasting. Let's take a look at the laboratory first!"

A group of people entered the laboratory, and when they saw the finished product, the people from Wuyou Institute were shocked!

"Why so small?"

The optical module of Institute 101 is about the same size as a large flashlight, which is very different from the optical module in the image of the Wu Post Institute. The communication optical module in their laboratory is about the same size as a refrigerator and requires a liquid cooling system. Just fine.

"Isn't it a YAG laser?"

"No need for a cooling system?"

Zhong Jiguang said: "We use semiconductor diode lasers? They generate little heat and do not need a cooling system."

Tang Baoguo of the Wuhan Postal Academy said: "We have also tested semiconductor diode lasers, but they are not sensitive enough to convert high-frequency optical signals. As far as we know, the Americans have not solved the problem of using semiconductor diode lasers for optical communications!"

Zhong Jigang's deputy Lu Yuxiang was dissatisfied after hearing this and said: "If the Americans can't do it, can't we do it? What's the point? In our 101st Institute, there are many things that even the United States does not have... "

Dean Zhang and Chief Engineer Tang were a little embarrassed when they heard this. Zhao Guoqing hurriedly said: "That's not what Chief Engineer Tang meant..."

Americans have only begun to envision the research on fiber optic composite light wave communications being conducted.

"Is this an optical splitter? Have you already started research on composite light wave communications?"

The so-called light splitter and light combiner are some combination prisms. After the laser is modulated in the resonant cavity, it is injected into the optical fiber. The light combiner is a combination of prisms that simultaneously injects multiple channels of light into the optical fiber.

The optical splitter, on the other hand, divides the composite light wave in the optical fiber into several parts, and then uses a grating to remove the light waves of other wavelengths in each part, leaving the desired wavelength light wave.

Zhong Jigang nodded and said: "G.652's anti-interference is too poor. Now it can only use light with wavelengths of 1310 nanometers and 1550 nanometers for uplink and downlink communications!"

Dean Zhang and his group looked at him very eagerly.

"Can you test it for us?"