The "2012 International Optical Fiber Communication Forum" co-sponsored by the Inner Mongolia Autonomous Region Party Committee Government, the Optical Communication Committee of the Chinese Communications Society, the Fiber Optics and Integrated Optics Professional Committee of the Chinese Optical Society was held on August 11-12, 2012 in Hohhot, Inner Mongolia. The theme of the forum is "Broadband China · Welcoming the Second Spring of Optical Fiber Communication". Academicians of the Chinese Academy of Sciences and the Chinese Academy of Engineering and the Ministry of Industry and Information Technology, the National Development and Reform Commission, the Ministry of Science and Technology, China Telecom, China Mobile, China Mobile, China Unicom, the State Grid, the State Administration of Radio, Film and Television and senior experts in the communications industry at home and abroad attended and delivered speeches The exchange and cooperation between China's optical fiber communication system and the world's counterparts have promoted the development of China's "optical advancement to copper" and "new generation of information technology". "Communication Industry News" (web) is the official cooperative media of this forum.
At the meeting, Zhao Zisen, academician of the Chinese Academy of Engineering, gave a speech entitled "New Progress in World Optical Fiber Communication".
Zhao Zisen: Good morning, leaders and experts! The topic I am going to talk about today is the new progress of world optical fiber communications. The main content is devices, modules and optical fibers, and transmission systems. The United States is going to open the World Optical Communications Conference, mainly these contents, this content is very rich, I will list the main representative, let everyone know.
What is the first industrial revolution is mechanized steam power; the second electrification, electric motor; the third is information technology plus green energy. Let us first look at the transmission system. What kind of transmission system does the transmission system have? Long distance and large capacity.
To what extent is the large capacity? It is 102.3TB. One trick is to transmit 240KM, he used these tricks, WDM, QAM, PDM. First, use QPSK. The second move, there is a QAM, if we are this, we use 0 degrees to 1 below the electronic control, keying below, 45 degrees phase keying. 45 degrees represents 00, 11, 10, the amplitude is reduced, we have become 8 channels, this is called QAM. It will also zoom out and zoom in, turning into many channels and turning into 8 capacity. There is another method, our orthogonal method, let's say we have 8 channels in common, this is the normal method above. A laser can be turned into multiple lasers, we have many explanations of this method in the world, there is orthogonal.
Next, let's see how long it is. I have a formula for long distance, which can be increased to 9376KM and transmit 9 × 112Wb / s. Laser line width 0.1nm, local LD ​​line width 100Hz, ULAF fiber, core area 120UM2, loss 0.185DB / KM, dispersion 20Ps / KM, dispersion slope 1.08PS / NM2 / KM.
Secondly, without relay transmission to 468KM, and 64 wavelengths, 43 G. This no-relay distance planning level is very useful. Raman F five-iber laser: wavelength 1276NM, power 6.3W, total loss of optical fiber line 76.1dB.
Furthermore, it is 100GB. From this, research at the beginning of this year has shown that the UK is already making a circle and has put 100G on-site experimental lines. So, a single wavelength of 100G, at a wavelength of 100G, has been sent to the commercial system ADM, with 3760KM. 250GB / S real-time transmission 6000KM. Fiber optic line 25spans SMF, 23spans Leaf. Now this is about the use of 231.5GB / S PDM-OFDM, high spectral efficiency 11.15B / S / Hz. Modulation method, CO / OFDM to Orthogonal Frequency Division Multiplexing to 1 wavelength.
Now there are multi-core optical fibers, multi-core optical fibers, and 3-core optical fibers that use multiple optical fibers to increase traffic. This method is used. It is an optical fiber transmission 43000KM-loop test. I am against multi-core optical fiber. Your multiple of 3-core optical fiber is very difficult. The position should be very accurate and need to be analyzed. I think multi-core fiber is troublesome.
50KM transmission Raman amplification-Gpon1: 256, a GPON can achieve 256. So what about our next generation optical network? Our next generation already has OTN-400Gb / S. At present, 240G is being developed, the user downlink is 1G, and the uplink is 500MB / S. Various PON, TDMAPON, FDM PON, etc., including a mixture of PONs. Home network, home fiber-to-the-home or home area network, now for home network, let's look at this HAN, heating, ventilation and air conditioning, security system, kitchen equipment, large household appliances, brightness control, energy management capabilities. Therefore, this home data network, how to send your meter speed to the grid, we are now transforming, and wirelessly sent to our power company.
Here we see that the home network to the metropolitan area network is wireless. The wireless enters a concentrator, concentrates everything, and then sends it to a power company in the wide area network. The power grid charges according to this, so this is a home data network alliance. Now that this concentrator is critical, the family then concentrates on a concentrator on the electric field. Now the NTT says that he now uses this PNC technology to get a 40-kilometer resolution, which is clear to 2 centimeters. What PNC is used as a technique for noise compensation. If you do a line here, OTDR + ONU-MAC address determines the fault location. This PON is very troublesome. Which one is dozens of subscriber lines? It is difficult to tell. Usually when it starts, it does a pre-test, makes a table, and stores the table in the machine. Later, according to this table, it was determined that the thread was defective.
European home networks are beginning to be wired + wireless, and plastic optical fibers have played a role here. In cases where we usually have many rooms, we use plastic optical fibers. Plastic optical fiber consumption, long-term cost plastic optical fiber is better. We use 0.8 to 1.4G users, or use DMT to use broadband 1.3GHz. POF-two-way shared construction + the lowest long-term cost is still plastic optical fiber. The building uses WDM, which is what he meant.
Now the United States has changed a lot because of our Internet and our Internet of Things and sensors, and now it is summarized. Now if you want to make a TV and Apple wants to make a TV, ipad has started to make this TV interactive, to watch and change you The structure, on-demand, etc. are not easy to handle. Now with the new method, our Internet TV can be on-demand. From IPV4 to IPV6, I was an American expert who visited us to communicate with each other. I asked him what level of Internet of Things and Internet do you have in the US? Can IPV6 be used? He told me that it is already available, and IPV4 has been changed to IPV6. I said, can your family use a mobile phone to control my refrigerator and air conditioner? He said he didn't dare to talk about the family and didn't go to the family survey, but this Mall supermarket, remote control of home appliances and security monitoring, these can be done with mobile phone control.
Devices, modules and optical fibers are a big problem of devices. Our fiber-to-the-home users require different wavelengths, which is troublesome at this time. Everyone uses different wavelengths, so this user's fiber to the home, the user wavelength is adjustable. In this way, the wavelength-tunable laser can solve the light source backup needs of WDM users. WDM-PON ONU upstream requires a wavelength-tunable laser and double-loop resonance.
The second one, how to adjust 112G modulation? Now we have started to use DP-QPSK-lnp modulator, put this in it. 160G can do it too, and Beijing University of Posts and Telecommunications can do it too. High sensitivity modulation mode, 4-PPM, 4 pulse positions with different pulse positions indicate different combinations of 2 constellations, and pulse position 1 indicates a combination of constellations. Do it now 2.7. Are we going to buy foreign integrated pai for 100G, now Alcatel has done it successfully.
Many operators understand the interconnection, there are international standards, operators need OTU4 standards. We have also used 100G of China FiberHome, of course, we bought foreign modules, and now we have developed our modules. Some people say that one of us is scientific research, the second is multi-mode transmission, and the third is multi-core fiber, which has achieved 1024Q. Solar energy has been made on clothes to concentrate this light into a module, so we will use this method for mobile phones in the future.
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