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Tang Hua looked at the equipment in the laboratory, two computers 10 meters apart, and two piles of parts including oscilloscopes piled up next to the computers. "Okay, I can see it from the furnishings in the laboratory, and you have indeed done it."

"Then...Teacher Tang, we agreed before?" Zhou Guangzhao rubbed his head and said with a smile.

"Of course it counts. If you make a breakthrough within one year, you will be rewarded with an album signed by your teacher's wife." Tang Hua took out the 1951 commemorative album signed by Zhou Xuan, and handed the box to Zhou Guangzhao, "But I still want to turn it on and have a look. The working process of laser modulation and demodulation."

Chapter 195, Optical Communications and Optical Fibers

Zhou Guangzhao’s laser communication verification demonstration was carried out between two computers, the distance between the laser and the receiver was 10 meters, and the laser was propagating in the air—this is why Zhao Zhongyao said that he would not come first, because the optical fiber was not made.

But at a distance of 10 meters, it doesn't matter if it spreads in the air.

Tang Hua and Zhou Guangzhao fiddled with the information waveform, modulation, demodulation, display, and finally connected the output to another computer, and filled the remaining space of the hard disk of that computer in 4 seconds.

Well, the data transfer rate is over 10KB/sec.

Now the "Iron Triangle" computer network of 50 Center, Zhisi and War Information Center has a transmission rate of 300bps...

At Tang Hua's speed that looks like a snail, the staff officers of the communications department with many years of work experience are scared to death. They just press the telegraph button at most a dozen times a second with crazy hands, and the error rate at this speed is very high. High, sometimes a telegram has to be sent twice to check each other.And the computer communication itself has been mixed with a check code, as long as the file can be received, the file must have been copied as it is.

"Guangzhao, in this case, your master's graduation project will be completed." Tang Hua said, "Hurry up and write your thesis, and I will translate it into Russian."

"Do you want to write a thesis? It's just a more complicated experiment." Zhou Guangzhao said, "Mr. Tang, this is because you have set the direction of the master's degree program, and the track has been paved. We're just running away..."

Tang Hua: "...This is the world's first laser communication device. It's not just a master's project. You have perfected the experiment and made it into a product. At least it is an academician-level achievement."

Zhou Guangzhao: "Speaking of the completion of the master's degree, Mr. Tang, I have applied for a graduate student from Professor Peng Huanwu of Peking University Research Institute. I will study elementary particle physics with Professor Peng. The school will start in September next year. I think I only want to study for a master's degree. My study schedule Not full enough."

Tang Hua: ...

In history, Zhou Guangzhao graduated from the Department of Physics of Tsinghua University, and then transferred to Peking University to study as a graduate student of Peng Huanwu. Tang Hua originally thought that now he would follow Zhao Zhongyao to engage in laser physics, and history would be messed up.It turned out that Zhou Guangzhao was lucky, and he was studying two master's degrees at the same time.

"That's almost perfect." Tang Hua said, "You have finished the principle machine of laser communication, and then because the supporting system has not kept up with your progress, there may be a year or two, and the research on laser communication will stagnate... …during this time you go to study elementary particle physics, and you won’t interfere with each other. However, the work of the optical storage group requires your laser modulation and demodulation device, so you still have to show up when they need you, or at least Let members of your group go to assist the optical storage group in the next step."

Zhou Guangzhao: "No problem. In fact, I don't need any time difference. I can take both classes at the same time, as long as my bicycle is not broken."

... All right, all right, Xueba can do whatever he wants.

But when it comes to the cooperation between the second group and the third group, Tang Hua thinks that the first group and the fourth group should also be reminded to cooperate.It took the first group less than half a year to make a laser irradiator, and Zhu Guozhen had already been hired by Tang Hua to make a laser gyro.This has something in common with the fourth group - laser measurement technology.

Speaking of the fourth group, Tang Hua wanted to complain about their group leader, Yang Zhen.The task given to the fourth group is two, the first laser range finder, and the second laser level.It is obvious that the laser level is the easiest to make, but Yang Zhen led all the team members to rush towards the laser rangefinder without saying a word. Now the whole team is stuck and failed to produce results. ——But the laser range finder is indeed much more useful than the laser level.

Tang Hua chatted with Zhou Guangzhao for a while before Zhao Zhongyao arrived.

"Teacher Zhao," Tang Hua stepped forward, "There is no rush for the optical fiber... Wang Dayan has already gone to Changchun to prepare for the establishment of the Institute of Optoelectronics and the Optical Instrument Factory. When he has results there, the optical fiber will have results."

Zhao Zhongyao: "I want to produce some optical fiber materials on a small scale in Tsinghua's laboratory before the Changchun Optical Instrument Factory is settled. Now I have started to do this work, and it may be enough to wait a few months."

Tang Hua knew that Mr. Zhao's DIY skills were roughly equivalent to the top geeks of later generations, but he still dissuaded him: "I think it's better to wait for the optical glass production equipment of Suyuan Optical Instrument Factory to be in place. Only in this way can mass production and application be carried out. In optical glass It is much less troublesome to make optical fibers on the basis of multiple purifications than to make them from scratch in the laboratory."

Zhao Zhongyao thought for a while and said, "Okay then. When will this Changchun Optical Instrument Factory start production?"

Tang Hua: "Military telescopes were put into production in January 1953. ... In terms of optical glass, in 1, one or two furnaces will be tested in April and May next year."

Zhao Zhongyao: "Then I will go to Changchun in April and May next year to find Wang Dayan."

……

After arranging the work plan of the optical communication group, Tang Hua also built a filter system for Zhou Guangzhao's experimental device. Now, the air medium communication of about 100 meters is not a problem. The two computers in the two teaching buildings combine the laser and The receiver can be connected to the Internet by placing it by the window.

Go out of the Department of Physics building to the south gate to pick up Zhou Xuan, and then walk together to the Tsinghua Auditorium, students and teachers keep coming up to say hello along the way.

Now people in Tsinghua either know Tang Hua or Zhou Xuan, and many people know both.

Zhou Xuan also came over, because today is December 12th.

Like the universities of later generations, the student union will definitely hold a party or some group activities on the day of [-].Besides, this is Tsinghua University, one of the birthplaces of the December [-]th Movement.

This year's [-] Gala at Tsinghua University, the stars who came may be a bit off the charts.Guan Hetong came to plan and organize, many singers of this period and some members of the first batch of condolences to North Korea came to make guest appearances, and then Zhou Xuan was added.

Plus Tang Hua...

Tang Hua stopped singing this time, but wrote a song.

What Hu Songhua sang on stage was written (copied) for him by Tang Hua.Not only the song, but even the microphone in Hu Songhua's hand was made by Tang Hua.

The XUAN-58 microphone imitating the Shure 1 has been in production for almost a year. In fact, the sales volume is not bad. Although it is not as good as Tang Hua expected, but considering that it is only sold in Sudong and China, the scope is not large enough, so it can still be sold. accept.

The small microphone allows the singer to sing hand-held on the stage, the typhoon is more active, and the sound quality of this product is better than that of a large fixed microphone.Although Hu Songhua only used the microphone during rehearsal, he quickly learned to walk while singing, turn around, bow his head (affectionately), walk two steps and pull the microphone cable... and other common stage movements.

"How many winds and rains, how many springs and autumns

Wind, frost, snow, rain, Bo torrent

Going through hardships and never changing your mind

Young ambitions do not express sorrow..."

After Hu Songhua sang a song, the audience applauded, and many teachers and professors burst into tears—many of them participated in the December [-]th that year.

Tang Hua himself applauded.

Hu Songhua's voice and singing skills are suitable.If it were Tang Hua, he really couldn't hold Liu Huan's style.Another reason why Tang Hua thinks that Hu Songhua is suitable for singing Liu Huan's songs is that he also looks a bit like Liu Huan. ——Well, although Hu Songhua is Hu Jun's uncle, he looks very different.

After Hu Songhua sang, it was the turn of a small chorus, and it was time for Zhou Xuan to play.

As soon as Zhou Xuan stepped onto the stage, the audience below applauded and cheered.Zhou Xuan also smiled, and waved the hand holding the microphone to signal to the audience.

The hand holding the microphone waved...

this microphone...

no line...

The students of Tsinghua University of Science and Technology in the audience were the first to react and exploded with a "boom".Then everyone in the audience understood what was going on.

Zhou Guangzhao, who manipulated the spotlight, moved the spotlight from Zhou Xuan to a corner of the stage just right when the applause was the most chaotic, illuminating Tang Hua who was adjusting the wireless receiver that had just been plugged into the sound system in the dark.

Tang Hua knew that the light bulb king Zhou Guangzhao was playing tricks, but he had no choice but to turn around and wave to the audience.

Now, in addition to applause, the audience also had "hahaha", "Ms. Tang!" and cheers.

Offstage, Zheng Yuying turned to look at Zhao Zhongyao: "You see, although Xiao Tang is busy inventing missile computer rocket launchers, he didn't forget to invent a wireless microphone for his wife, how about you?"

Zhao Zhongyao: ...

If Tang Hua heard these words, he would probably retort, "Master, this looks like a wireless microphone, but it is actually four thousand foreign exchange rubles!"

But to be honest, earning foreign exchange is one aspect, and Tang Hua and Zhou Xuan feel comfortable using it is also an important reason.