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……

Chang Qing said, "Who will come first?"

Bai Lei said directly: "Come on, the teacher gave me a lot of valuable opinions last time, and this time they have been revised, and I also ask all teachers and colleagues to criticize and correct." ”

"Say it. ”

Bai Lei opened the PPT and began to say: "My topic is the dynamic chromatic dispersion compensation in the 40Gbs single-channel optical fiber communication system, the whole system is composed of an adjustable chromatic dispersion compensator, a chromatic dispersion detection module, and a control module, and the control module controls the amount of dispersion according to the feedback signal monitored by the chromatic dispersion detection module, so that the dispersion compensator produces the corresponding negative dispersion to compensate for the redundant chromatic dispersion in the transmission line......"

For non-professionals, listening to this highly professional subject must be trying to hit the wall with his head, although Liu Chen knows little about optical fiber communication, but he has studied the CAN bus transmission mechanism, and he is still a super god in hardware implementation.

What's more, Bai Lei's PPT is really doing a good job.

"Wait a minute, the dispersion compensation fiber makes the optical fiber have a high negative dispersion by designing the waveguide structure, and adding a small section of the dispersion compensation fiber with a high negative dispersion coefficient to the long-distance optical fiber transmission line can offset the positive dispersion of the ordinary single-mode fiber, so that the total dispersion value is zero, can it be completely compensated for zero?

For any teacher or student can be interrupted at any time, Bai Lei just said for a few minutes, and the other teachers began to ask questions, almost every point had to be taken out to question, although they were fully prepared and asked Guan Debao to review it in advance, there were still things that were not well considered, cold sweat broke out on their foreheads, and some key questions squeaked.

"The compensation range and compensation accuracy of the compensation module are related to the number of optical switches and the length of each dispersion compensation fiber. Are you normalizing the units of the formula here? I don't think so. ”

Bai Lei's heart was beating faster, and he couldn't help but reach out to wipe the cold sweat on his forehead, Nima, every Sunday night is like going to hell. After taking a breath, he replied: "Limited to laboratory conditions, the dynamic chromatic dispersion compensation module in the experiment uses two optical switches and a four-segment dispersion compensation fiber cascade ......"

"I'm asking you if the unit of the formula is normalized, if this formula is not correct, then your experiments based on this premise and the subsequent analysis will be waste paper!" Chang Qing said coldly. Naturally, he could see the key at a glance.

"This ...... This formula ...... "Bai Lei is about to cry, could it be that he has done it again in vain for a week, he simply changed his name to Bai Gan, this week is a waste of a week, and it hurts."

Asking for help, his eyes turned to Guan Debao, and Chang Qing shouted directly: "Don't always want to rely on others, you can see if there is a problem with the formula yourself, you straighten out a few units." ”

Guan Debao just wanted to help Bai Lei break the siege, but this time he quickly shut up and didn't speak.

"The length is m, per-p/nm. L is dB......"

"Are you right? Teacher Li is right, your formula has not been normalized, how did you do it in the next experiment?" Chang Qing stared at him and shouted.

"I ...... I missed it, I ...... "The dashing and personable vice president of the school's student union wanted to die at this moment, his face was red, his head was cold sweat, and his speech was trembling."

"Your heart is not in scientific research at all, and you have been warned a long time ago about all that nonsense, right? Look, something went wrong last week. There was another mistake this week, I heard that your family is not bad, and if you don't want to do it, you should quit school and go home, just your attitude. Let me tell you clearly, there is no way to graduate from me. ”

The name of the cold-faced king of Hades and his poisonous tongue is by no means in vain, this scolding does not take into account the face at all, Bai Lei did not dare to answer, lowered his head and said nothing. The other students glanced at them sympathetically and quickly corrected their attitudes.

Chang Qing was really angry, slapped the table, and said, "You have temporarily stopped the work at hand, and your mentality is so impetuous, it is just a waste of resources provided by the state." ”

Bai Lei is about to cry, it is true that he likes to engage in student affairs, after all, the kind of group of subordinates who respond to every call is very refreshing, but he is worthy of being a scholar, reducing sleep time to make up for scientific research, and staying up late every night to read literature, it is really unlucky, he made two low-level mistakes, and all his achievements were erased.

Always mentally prepared, but also very aggrieved, I really want to cry.

"Next, a waste of everyone's time. ”

Chen Yuezhan trembled and began to speak, his voice trembled a little, how many times has this been, and he can't calm down, Bai Lei was bombarded too badly.

Liu Chen just smiled at some times, scientific research must be focused, 100 percent, distracted, even if he makes up for it hard, it is difficult, he will not sympathize with Bai Lei at all, he only pays attention to Ling'er, it can be seen that the first time he experienced this battle, he saw Bai Lei's embarrassment with his own eyes, he was a little frightened, and it looked unnatural to purse his lips.

Xiao Ling'er, don't be afraid, with my brother here, no one will be embarrassed for you.

Zhuo Ling didn't know that Liu Chen could escort her, she was really nervous, her palms were sweaty, she saw with her own eyes how much hard work Bai Lei had paid, and it was still the case after testing it over and over again, and the topics she did were even more insufficient, and she secretly regretted that she should listen to what Senior Sister Chen said, and remove the half-understood content, so she could only talk about it hard.

Although it was still a reproach, Chen Yue passed the test smoothly, and Bai Lei's face was even more ugly, if Chen Yue was also severely criticized, it would be more or less balanced.

"Chen Yue's research is very delicate, yes, this topic will continue to excavate, and strive to produce a high-level result. For serious students, Chang Qing did not hesitate to encourage, Chen Yue smiled and nodded, and there was a layer of cold sweat on his back.

Next is the two doctors who narrated, although they were very embarrassed, they also passed the test smoothly, and it seems that the worst is Bai Lei.

Chang Qing looked at Zhuo Ling gently and said with a smile: "Zhuo Ling, it is the first time for you to attend our regular meeting, how do you feel?"

The attitude is kind, and the other teachers and students simply don't believe their eyes, is this Changin?

Last time, Zhuo Ling told Chen Yue that she called Teacher Chang, and her tone was very kind, Chen Yue still didn't believe it, and she immediately felt incredible, she was a girl, why is there such a big difference in treatment, is it not beautiful enough? No, Teacher Chang has always treated men and women equally, and will never lower her requirements or scold less because she is a girl.

Liu Chen glanced at it with a look, what does that mean, can you be normal?

Zhuo Ling was also surprised, and replied calmly: "All the teachers and senior brothers and sisters are very rigorous and have benefited a lot. ”

"Okay, Zhuo Ling is only a sophomore, but she is very talented in scientific research, she entered the laboratory in advance, and has been taking the initiative to help Chen Yue do a lot of work. ”

Chang Qing said with a smile.

Oh my God, encouragement is the Lord! Is that what the Standing House is saying?

[Thank you for your continued support, this time from the 515 Fan Festival of the Writer's Hall of Glory and the General Election of Works, I hope you can support it.] In addition, there are some red envelopes on the Fan Festival, get one and continue the subscription!] (To be continued.) )