Seeing that this person is not very old, the Stokes space vector is quite complex and very brain-burning, and the average graduate student can't figure it out, Guan Debao doesn't think this guy has any high level. Pen % fun % Pavilion www.biquge.info

Vectors are the easiest way to confuse people.

However, if the theory of optical fiber, Liu Chen may not know it well, and in terms of mathematical description alone, he is confident that Chang Qing may not be inferior to himself.

Liu Chen stood up directly and drew the relationship between the various components of the second-order PMD on the whiteboard.

Ling'er raised her eyes and looked at him, brilliant, puzzled, there was also an appreciation, or surprise, too many complex emotions were mixed together, and she pursed her lips and looked at the junior.

That's what vector representation is all about. Liu Chen explained in simple terms, "I believe Zhuo Ling must have understood." ”

Well, Ling'er nodded.

Chang Qing couldn't help nodding on the side, although Old Man Gong had been praising Liu Chen for how he was a demon and how talented he was, and he also knew that Liu Chen was very awesome at making a big company, but it was the first time he saw him say professional knowledge, and he immediately saw that this guy was really powerful, and such obscure knowledge was so straightforward, what a deep understanding it needed.

Hurriedly said: "Chen Yue, this part of you has always been a weakness, listen carefully, Liu Chen spoke very well." ”

"Teacher, I also understand, Teacher Liu Chen is really good. She said with a flash in her eyes, she increased her knowledge, and she didn't know where Liu Chen came for a while, and she was commensurate with a teacher.

Guan Debao's face was not very good.

"Zhuo Ling, go on. Chang Qing said with a smile, I am really happy that Liu Chen's little girlfriend is in the optical fiber laboratory, otherwise he would not have had the opportunity to contact this young genius at all, and the old man Gong directly refused to solicit him, Nima, he made such a big company at such a young age, at least hundreds of millions of assets, thinking of this, he couldn't help but envy.

"Okay, teacher. Zhuo Ling continued calmly. "In order to overcome the PMD of optical fibers, OFC2001 to 2003, optical fiber torsion technology was used to manufacture optical fibers with low PMD coefficients. The fiber in the drawing process is continuously torsioned with a certain torque ......"

"What is the relationship between fiber torsion and PMD coefficient?"

"Why has the low-speed drawing been replaced?"

……

Zhuo Ling almost didn't say a word, Guan Debao had to ask questions, although she was a little stuck, she insisted on thinking and then answering, and she had to say. In the process, her thinking became clearer, but it was really difficult to deal with it, after all, the time she entered the laboratory was too short.

Liu Chen didn't say anything more, although Guan Debao asked questions with a long spear and a short shot, and his eyes looked at him from time to time, which meant to be provocative, because he was jealous and angry, and wanted to compete for strengths and weaknesses, but Liu Chen didn't fight again. He understands that Ling'er has pride and needs to face it independently to grow, and these questions are not unanswerable, unless Guan Debao's questions go beyond the professional foundation at the undergraduate level.

Despite this, it was still very distressing for him to see it with his own eyes.

Well, Zhuo Ling reported for the first time, collected detailed data, and summarized the basic concepts of polarization mode dispersion, and various mitigation techniques and compensation technologies to solve the optical signal transmission damage caused by polarization mode dispersion. At present, the dynamic combination of polarization mode dispersion mitigation technology and compensation technology is the development direction to solve the problem of high-speed and long-distance transmission......"

Chang Qing looked at Liu Chen's silent entanglement, and he could understand his mind very well. I haven't come out to speak, after all, taking care of it is different from complete protection and doting, and the degree is too much, which is counterproductive. I will not criticize Guan Debao for such an obvious outrage, after all, scientific research is not gentle, but a bloody process, a tearing of thinking.

As soon as he summed it up, it was over, and Guan Debao was still unsatisfied.

Chang Yuan said: "Xiaoguan." Here you go next. ”

Guan Debao came to the computer in the report seat, and said in a somewhat arrogant tone: "My recent topic is related to Mr. Yan's side, the application of optical fiber communication technology in relay protection, combined with the optical fiber current differential WXH-803 optical fiber interface of the high-voltage line protection device, the optical fiber communication system in the high-voltage line relay protection has been analyzed, and the special mode of optical fiber channel has been studied. The communication architecture of the connection modes, such as 64Kb multiplexing mode and 2Mb multiplexing mode, as well as various influencing factors of Fibre Channel communication performance under the above three connection modes, including the clock mode of optical transceiver and multiplexing equipment, optical receiving power, optical transmitting power, optical saturation power, communication channel margin, electromagnetic shielding measures and equipment matching, etc., are analyzed and discussed......"

It is worthy of being the new star of scientific research of the Great Electric Power Institute last year, Mr. Guan talked eloquently, his thinking was clear, and the typhoon was steady, especially the details that may cause questions were multifaceted, and the teachers did not speak, and the students seemed to understand whether they understood or not, so they naturally did not dare to say anything.

Of course, there are exceptions.

Gao Jian held his breath in his heart, it was uncomfortable to follow Teacher Yan Sheng's team, but he didn't expect to be directly assigned to Lin Yong, with two masters of waste materials, and a female doctor who knew that he didn't understand the information, and caught up with the girl who had been pursuing for a few months and got along with others directly, and she was in a bad mood recently.

"Mr. Guan, how is the clock configured?"

Gao Jian broke Teacher Guan's narration and took the lead in asking questions, Teacher Guan stared at him, and it was not very pleasant that some students dared to interrupt him to ask questions.

Which student doesn't know that his teacher's logic is rigorous and impeccable, and few people ask questions.

In the special mode, there is no other clock reference in the optical fiber communication system, and it is necessary to set at least one end of the optical transceiver and transmit interface of the optical transmission module as the main clock, so as to provide a clock reference for the optical transmission data of the optical transceiver and transceiver interface. The most accurate question would be how the clock is set, not how it is configured. ”

This is Mr. Guan's style, to ridicule the questioner in turn, almost every time, over time, how dare anyone speak.

Gao Jian's face was not very good-looking, and he wanted to refute something, but he still couldn't help but say nothing.

Guan continued: "In general, the sending clock of the two devices can be set to work in master-master mode, where the internal clock is used for sending data and the clock extracted from the received data stream is used for receiving data. ”

What else can you do but be speechless?

A few minutes later.

"Wait, Mr. Guan, I remember that in relay protection, Fibre Channel margin calculation is essential, did you miss it?"

Gao Jian hibernated, and finally grasped another problem.

Guan Debao smiled and said, "How can I forget what you know as a layman?"

Regarding Gao Jian's question, Guan Debao has already scoffed unabashedly.

"The reason why I didn't say that this problem is not an omission, but to wait a moment to talk about it, since you asked, let's talk about it first, because the optical module work is greatly affected by temperature and aging, in order to ensure that the channel works normally, the fiber channel margin check needs to be carried out. When verifying the channel margin, the transmit power and receive sensitivity are taken from the measurement correction value or the factory nominal value of the optical module, and the other parameters are taken from the empirical reference value. ”

"To this end, I specially programmed a small program, which can be calculated by entering parameters, and I will upload this program in the laboratory FTP later, and everyone who is interested can download the study. ”

Gao Jian's question was like a trust, Guan Debao's answer was impeccable, he had always been a self-proclaimed technical expert, his face couldn't hang up, his fair skin was blood-red, he was consciously embarrassed, and he gritted his teeth and didn't say a word.

……

[When it comes to professional knowledge, I'm going to talk about water again, so add a few more words, these contents are really more bothersome than advancing the plot] (To be continued.) )