Military Industry of Great Powers: Build the Strongest Flanker

Twenty light waves with wavelengths between 1330 nanometers and 1550 nanometers are composited and injected into the optical fiber. After 144 kilometers of transmission, twenty composite light waves are separated from the optical splitter, and then processed by gratings and divided into twenty pure ones. light waves.

"Director Zhao, the speed has not decreased, it is still 8.7gbit/s!"

Zhao Guoqing smiled and said: "It seems that the limit is not in the optical fiber material, but in our optical module!"

"It's already very strong. I remember the report from the United States last year that the speed was only 300mbit/s. Our single-wave transmission is 20 times theirs. If we add complex wave transmission, the speed is 400 times theirs!"

Zhao Guoqing didn't know what to say. 400 times, 174gbit/s. This is no longer a significant lead, but a far lead plus a far lead.

"Try our repeaters!"

"good!"

The repeater receives a weak light signal from the optical fiber and converts it into an electrical signal through a photodetector. After regeneration or amplification, it excites the light source again, converts it into a stronger optical signal, and sends it into the optical fiber for continued transmission.

Repeaters can allow optical fibers that can only travel for more than 100 kilometers to be transmitted for thousands of kilometers or even tens of thousands of kilometers.

Generally, repeaters are wired together with optical cables, and carry remote power supply lines, as well as remote control and telemetry lines. This solves the problem of high-sensitivity laser diode semiconductors, and there is no technical difficulty in repeaters.

Split the optical fiber under test into two halves and connect repeaters to both ends. The actual measurement has no effect on optical transmission.

Zhao Guoqing can now draw a conclusion.

"The test report will be made as soon as possible!"

"OK!"

Zhao Guoqing then said to Zhong Jigang: "The optical module will be finalized according to this indicator. Follow-up research cannot be interrupted. You can arrange for someone to send the optical module equipment to Datacom Electronics Factory and discuss with them what needs to be modified for mass production!" "

"I know!" Zhong Jigang said: "When designing the circuit board, I paid attention to the standardization of parts and strived for various models so that more parts can be interchanged!"

Teacher Xiao Zhao shook his head and said: "Those for military use should be considered interchangeable, but those for civilian use should not be used!"

"..."

"It doesn't wear out, and it's so easy to repair if it wears out. How can you make money?"

"..."

"Well, convenient manufacturing and reducing manufacturing costs are the priority factors of the design!"

Zhong Jigang nodded, and Zhao Guoqing didn't know if he understood.

…

Thousands of miles away, Wucheng was conducting the same test as Institute 101, but the difference was that Director Hao from the Ministry of Posts and Communications came to witness it in person.

It was concluded that the composite transmission speed of twenty waves could reach 174gbit/s. Minister Hao had no idea.

Dean Zhang Shitao said: "Minister Hao, using the technology of the 101 Institute, this optical fiber can support 1 million telephone calls at the same time!"

"..."

Minister Hao was shocked and said: "There are 1 million telephone lines, and a hinged optical cable can have up to 288 optical fibers. Are you saying that one optical fiber cable can support 300 million telephone lines at the same time?"

Zhang Shitao suppressed the excitement in his heart and said, "Theoretically, this is what it looks like!"

Minister Hao took a long breath and said after a long while: "This 101 Institute is really amazing. Dean Zhang, come with me to the capital. By the way, the test report will be written on the way!"

"good!"

…

Chengdu Aircraft Manufacturing Co., Ltd., super seven project test workshop, the 101 optical module has just been delivered to Chengdu Aircraft Manufacturing Co., Ltd., using the military route.

Optical modules are the same for civilian and military circuits, but there are obvious differences between the two.

Military optical modules require high reliability and sensitivity, but do not have many requirements for transmission speed.

"General Master Zhao, these optical modules are specially made by our 101. Each optical module contains three light-emitting and light-receiving modules. However, there is only one civilian optical module. If only one of the receiving and receiving light modules fails, it can be restored within three thousandths. Quickly switch to bypass within seconds to ensure reliability..."

Zhao Zhongshu said: "The National Day is quite thoughtful."

The optical module entered the testing phase immediately, simulating various high temperature, high humidity, low pressure, and low temperature scenarios.

"How about it?"

"The test is normal. Using optical fiber for transmission has a lower failure rate than cables. Chief Zhao, can you install a direct optical fiber among the four degrees to transmit the signal?"

Zhao Zhongshu's expression became solemn. If it was radar and navigation, Zhao Zhongshu would agree without hesitation, because if the radar breaks down, the plane will not fall down.

The telex is what controls the flight of the plane. If something goes wrong, the plane will crash!

After thinking about it, Zhao Zhongshu shook his head and said: "Let's continue to demonstrate and prove it. If there is still no problem, consider using optical fiber instead when we get on the plane!"

"good!"

That night, Chengfei's test report on the optical modules of Institute 101 was also sent to the General Staff in the form of a telegram.

…………

The release of an optical module from the 101 Institute has been brewing for two months and finally broke out in Beijing.

Seventeen ministries and commissions and research institutes, including the Science and Technology Commission, the Ministry of Posts of China, the General Staff, the Ministry of Industry, the Ministry of Industry and Information Technology, the Information Institute of the Chinese Academy of Sciences, the Information Engineering Institute of Qingda University, the Wuhan Post Institute, and the 101 Institute gathered in the capital.

Zhong Jigang, on behalf of the 101 Institute, gave a report on composite spectroscopic optical modules in optical fiber data transmission.

Zhang Shitao, president of Wuhan University of Posts and Telecommunications, demonstrated the excellent dispersion control performance of type 655 optical fiber in composite light wave transmission.

Director Liu Qing nodded in the audience. He was slightly disappointed that Zhao Guoqing did not come, but he nodded when he saw Zhong Jigang's confident report.

"Here comes another newcomer. This Chief Engineer Zhong looks to be in his early thirties! Good guy, he is four hundred times ahead of the United States!"

One optical cable can handle all the phone lines in the country, 300 million phones.

Zhong Jigang described in detail Director Xiao Zhao's idea that telephones, televisions, mobile phone base stations, and computer Internet would be unified into a network, and the terminals would be operated by each company.

"Can it be solved technically?"

Zhong Jigang nodded and said, "Dear leaders, you can let Comrade Song Yujuan, a network engineer from our 101 Institute, introduce you!"

Then a girl in her twenties came up to the stage and put the diagram on the projector.

Schematic diagram of backbone network, branch backbone network, branch network, and various local area networks.

"Dear leaders, Institute 101 has specially designed the IPP protocol for telephone and telegraph services. Phone numbers correspond to physical addresses and regional LAN virtual IP addresses. Data is transmitted in the backbone network branch network through the TCPIP protocol."

"As for television, most of it is transmitted by wireless transmission from TV station towers, but intercity TV stations can also use ADC chips to sample digital signals and transmit data in the backbone network..."

"As for the base station wireless phone, the base station signal can be digitized and transferred to the backbone network for transmission. Dear leaders, data transmission based on the base station can also be extended to the future needs of home users to access the Internet through wireless..."

call!

Is there anything wrong? Even Li Chaodong, an expert from the Academy of Sciences who has the deepest knowledge of the Internet, couldn't help but nod. The Academy of Sciences was considering establishing the Internet as early as seven years ago and was even working on connecting to the international Internet.

The Academy of Sciences has organized many inspections, especially to the United States, the country where the Internet was born.

Even the United States is not developed to this extent now.

Meng Fanxing on the side asked: "What about the plan of Institute 101?"

Li Chaodong took a long breath and said: "I don't know how to evaluate it. It's too advanced. There are also home users in the United States. They can only access the Internet through dial-up through the telephone network. I have never heard of wireless access to the Internet!"

"……Is it possible?"

"I don't know, there are a lot of difficulties!"

…

Although the merger of digital networks was not decided at this meeting, the debate between optical cable and electric cable was settled, and optical cable was used for the backbone network.

Leaders are still very cautious in making decisions, especially new technologies. The Academy of Sciences proposed to build a long-distance optical cable from Wuxi to Lucheng, then to Jinling, and finally to Shanghai.

The backbone network connects Wuhan University, Wuhan University of Posts and Telecommunications, 356 institutes of the Academy of Sciences, Lucheng University of Science and Technology, 101 institutes, and 14 institutes of Jinling Nanjing University, China Southern Airlines, and China Electric Power, to 503 institutes in Shanghai, Fuda and other research institutes and colleges.

This plan was approved by most people.

The design of the line was led by the Academy of Sciences and completed by the 101st Institute and the Wuhan Postgraduate Institute.

When the news reached Lucheng Institute 101, Zhao Guoqing sighed: The national information highway started six years in advance, and the data specifications far exceeded the data at that time.

The exposure of complex wave splitting transmission technology once again brought Institute 101 to the eyes of the Western world.

"101, is it still the 101?"

The Wall Street Journal’s breakdown of the achievements of 101 institutes probably started with program-controlled telephone exchanges. At that time, program-controlled telephone exchanges did not attract the attention of the West. After all, the West had solved this technology ten years ago.

EDA software is what made the West remember Xintu Company and the 101 institutes behind it.

As for the optical module transmission technology released at the beginning of the year, the impact is definitely there.

But this composite optical splitting data transmission technology is amazing.

"China has not only made breakthroughs in optical modules, they have also made great breakthroughs in optical fiber materials!"

"God, how did they do that."

"I really hope this data is false!"

The Chinese Embassy in Eagle City has received requests for academic and scientific research exchanges from many companies and institutions including Bell Company, Texas Instruments, and MIT.

There are many more companies looking for cooperation.

"If this data is true, I have seen countless dollars."

"Yes, we can't let others get there first!"

At this moment, the West is boiling.