1, divided into direct modulation, cavity modulation and cavity modulation three. ① Direct modulation method: The external signal directly controls the pump source of the laser, such as controlling the injection current of the semiconductor laser, so that some parameters of the laser are modulated. (2) Intracavity modulation: intracavity modulation is done by changing the parameters of the laser such as gain, cavity Q value or lightIt is mainly used in Q switch, cavity measurement, mode-locking and other technologies. 2, according to the relationship between modulation and light source, light modulation can be divided into direct modulation and indirect modulation two categories. The direct modulation method is to convert the information to be transmitted into an electrical signal into LD or LED, so as to obtain the corresponding optical signal, which is the method of power supply modulation.
3, from the signal modulation technology, there are PM modulation (phase modulation), FM modulation (frequency modulation), AM modulation (intensity modulation) three. PM modulation cost is high, basically has been abandoned; FM modulation was common in the early days,": By Huang Zihua and CAI Shaofen starring mystery and crime drama, popular with the audience, the plot is compact, humorous. Forensic Pioneers: A series of highly acclaimed forensic mysteries starring Ouyang Zhenhua, Meng Jiahui and Lin Wenlong, each of which tells how forensic officers solve cases through scientific methods.
2, TVB beautiful TV series are: "Rush to the sky" "Apostolic Walker" series "Pioneer" series "Golden branch evil" The above recommended TV series are TVB classic, the following for you to introduce several of them in detail: "Rush to the sky" this TV series to the aviation industry as the background, exhibitionThe lives of the pilots, their emotions and the challenges they face.
3. With its wonderful plot and cast, such as She Shiman, Liu Jiang and Wang Qing, Amazing Shot presents a passionate Jianghu story for the audience. "The Four Gods of Youth" by Lin Feng, Chen Jinhong and other strong actors starring, is a combination of intelligence and emotion of the detective drama.
4, -1- "Big Times" 1992 Douban score: 2 Director: Wei Jiahui Screenplay: Guan Jingwen/Guan Jingyun/Fang Shiqiang/Chen Baoyan/Wu Liguang/Zhang Lili /Long Wenkang/Chen Baohua/Zhang Baoyan Starring: Liu Qingyun/Zhou Huimin/Guo Aiming/Zheng Shaoqiu/Li Lizhen Type: Plot "is a classic, but also elegy, the golden age of Hong Kong drama no longer comes."
5, "Originally fell in love with the thief", "spirit detective", "walking with the enemy", "chasing soul transaction", "O record", "Anti-black pioneer". Funny "Miao Cuihua", "Ninety-Five Supreme", "Looking for Qin Ji" (very good), "Four talents in gold", "Very foreign father", "Ten brothers", "Awang New biography", "Feitian happy event", "Brothers and Sisters", "My savage grandmother", "savage grandmotherWar Goshi milk "" Dongdu detective".
6, tvb classic drama is too much, countless excellent TV series is simply too many to count. In order to save you some time, I will recommend a few classic TVB series that definitely do not crash. The heroine of the Righteous sea of pride is definitely the best anti-Japanese drama I have ever seen.
1. A far cry from the usual glowing superstar. In order to better take the initiative to do the epidemic prevention work, Chen Long rode a bicycle in the streets and alleys. Whenever he has homework to do, he will carry a horn icon to warn passers-by at the end of the street community to show the high importance of epidemic prevention. Many netizens were moved by actor Chen Long's work as a volunteer in Shanghai. He is a public figure, so it is easier for him to attract people's attention after doing this.
3, "Chen Long set up a simple convenience barber stall at the door, although it looks very simple, but the neighbors are very supportive, it is said that Chen Long's barber stall is also on fire, has been" open "for three days, and there are many residents every day, it seems that everyone on Chen Long's barber technology is still very recognized. On the same day, Chen Long rode on the battery car early, wearing a mask and a mask for double protection, after all, volunteers also need to protect themselves.
4, Chen Long made a temporary barber booth in his own community, so that those who need a haircut can get a haircut, such an action can see his careful. He used... himselfOur actions have brought convenience to the people around us. I believe that with the company of such positive energy actions, we can strengthen everyone's confidence, stick to it, and defeat the epidemic as soon as possible.
5, actor Chen Long turned epidemic prevention volunteers, entertainment circle like Chen Long can do their part in the epidemic prevention work of positive energy stars and Han Hong and Mai Changqing and so on. To be honest, it is admirable that stars can put down their burdens to do volunteer work, because they have the burden of idols because of their own popularity. But after putting down the burden of idols, stars still do quite well, after all, they have a positive effect on society.