-The company has capital or technology, or both;
-we don't have big capital and ready-made technology to defeat the enemy;
-then the only space for our survival and development is to create the company's own key technologies and products with the least cost;
-So the company only has the "Huashan Road" of technological innovation!
I graduated from Wuhan University, majoring in semiconductor physics. In the communication industry, I became a monk halfway. I remember that in the late 1970s, when I returned from studying in Germany, the German Henri Hertz Institute (HHl), where I was studying and engaged in research, took an unprecedented day off to see me off. My teacher, Professor Barker, a world-famous optical communication scientist, said: "It was a misunderstanding that Teacher Yi came to us (because they didn't know in advance that my major had nothing to do with communication), but the result of this misunderstanding was a miracle. He set a world record with us in Berlin, and I hope Mr. Yi can do something for his country when he comes back. " He also gave me some unsolved problems in the world. I have been afraid to forget the teacher's teaching and expectations for decades. Nowadays, one of the breakthroughs that our Weibo Optoelectronic Technology Company has chosen in independent scientific and technological innovation is a century-old problem in the world.
The reason why the century-old problem is chosen as a breakthrough is based on the following considerations: first, the threshold of science and technology is high, which is difficult for competitors to reach and surpass in a short time, and innovators are easy to monopolize the original innovative technological achievements; Secondly, once the century-old problem is broken, it will achieve great results and produce corresponding huge economic and social benefits; In addition, we have done a lot of theoretical deduction and calculus before, and its feasibility has sufficient theoretical basis.
In the popular language of the information industry and even today's society, we often hear words such as "informatization" and "digitalization". In fact, these two terms are quietly changing our society and even our life. For example, today's Internet, IP phone, high definition multimedia and so on are all the results of informationization and digitalization. In the eyes of many people, digital information technology seems to be mature, but in the eyes of many scientific and technological workers, it is not yet mature. For example, "FTTH. H ",we have been waiting for many years, and it has never been realized.
Our company aims at "FTTH" technology and has carried out long-term and arduous independent innovation research and development. In fact, there has always been a century-old problem in the field of digital communication, that is, the transmission problem of arbitrary digital sequences or the transmission problem of random digital sequences. According to the theory of digital communication so far, the digital signal stream needs to be homogenized (pseudo-randomized) by complex digital processing before it can be transmitted, which is only suitable for point-to-point transmission. The whole network is expensive. But "FTTH" is almost impossible according to the current theory and technology, because there is no balance between the operating cost and the consumer price of the network.
In the mid-1990s, bell laboratory invented the world's first "burst digital receiver", and based on this, it invented a point-to-multipoint "passive optical network system", referred to as PON system, so the global "FTTH" engineering and technical action began.
However, there are many theoretical and technical defects in Bell Laboratories' invention. First of all, this invention in the United States is based on the traditional transmission theory. Digital signal streams are segmented, and each signal stream (that is, signals sent at different points) must be uniform (pseudo-random). Therefore, the transition zone between two digital signal streams becomes a "blind zone" for signal recognition, and all signals in the blind zone will be lost. Secondly, it is impossible for this kind of segmented jump processing method to be accurate, so the sensitivity of this receiver is very low, and it is difficult to make full use of the transmission power of the signal, and it is also difficult to reach the rate above 2.5Gbps.
Since the PON system is actually a broadcasting system with two-way communication and switching functions, it has lower network cost and lower consumer price in principle. However, at present, the PON system based on the principle of American invention has the above theoretical and technical defects, and the broadcast coverage is small. When the uplink rate is 155Mbps, its broadcast coverage (split ratio) is only 1: 16 to 1: 32, so its consumption price is still not low enough to be popularized.
In view of the above theoretical and technical problems, with the support of the National 863 Plan and the relevant scientific and technological development plans of Shanghai and Pudong New Area, our company insists on independent innovation and is determined to overcome the century-old problems in the world.
Firstly, the scientific and technical workers of our company have deduced the transfer function of the burst receiver based on arbitrary digital sequence, and theoretically extended the existing theory of pseudo-random signal stream transmission to the transmission of random signal stream.
Secondly, our company designed and manufactured a new digital burst receiver according to its own theory. The receiver has extremely high receiving sensitivity, and there is no blind area for signal identification (no signal loss). Compared with the existing receiver, the sensitivity can be improved by 10dB (that is, ten times). Using this technology, when the PON system goes up at 155Mbps, the broadcast split ratio can reach 1: 256, the network cost can be reduced by ten times, and the consumer price will also be reduced by ten times.
It can be predicted that our achievements will not only be used in FTTH, but also will replace all the traditional digital optical receivers in the world. Our revolutionary progress in the field of digital optical receiver is five times higher than the sum of the world's progress in the past 20 years (10dB), which will be enough to solve the bottleneck problem of current communication technology and network development. In many cases, expensive avalanche photoelectric devices and optical amplifiers can be omitted, making it possible to automatically switch optical networks, which has bright prospects in national security and military applications. In addition, we have a series of other corresponding breakthrough innovations and applied for more than ten invention patents, including two American invention patents.
Our above-mentioned projects have passed the acceptance of national and local authorities, and these departments are rigorous in theory and technology. According to my experience in optical communication research, production and engineering construction for more than 20 years, the value of the above achievements is immeasurable.