Preface: Through nearly a week of study, we learned a lot of things from the perceptual, but also on our future learning and research direction to determine a far-reaching impact. Through this visit to the internship has enriched my theoretical knowledge, enhance my ability to observe, broaden the horizons, and make me have a qualitative understanding of the work in the future, really let me gain a lot. Now the internship on the content of the internship visit, internship harvest, and the future direction of their efforts and the feelings of the three aspects of the summary.
Preparation:
September 1 this day we participated in the awareness of the internship mobilization meeting, where the teacher gave us a detailed explanation of the internship notes and other matters and the unified arrangements for these days of internship, and encourage us to be diligent in asking questions to the technical staff, I hope that through this internship, so that we have a better and deeper understanding of the profession.
First, visit the content of internship
1. China University of Geosciences communication system laboratory
September 2 in the teacher's leadership, we took the car to China University of Geosciences, to visit the communication system laboratory. There we learned that China University of Geosciences Communication System Laboratory is an important communication and information technology experimental teaching base for undergraduate and graduate students, integrating experimental teaching and scientific research in one of the open laboratories. It provides a good practical training environment for cultivating innovative talents and a cooperative exchange platform for school-enterprise ****building. The overall goal of the system is to build an experimental platform.
While following the teacher's visit, the internal teacher introduced the communication experimental system by Huawei's metro series of optical transmission products, c&c08 program-controlled switches, ma5300 broadband equipment, h3c layer 2 and layer 3 data communication equipment, wireless access, such as the five major hardware platforms and special communication software. Each platform in the special software (e-bridge, t2000, etc.) under the support of both independent experiments can be opened, but also to open the systematic experiments, to provide a variety of end-to-end communication solutions, can simultaneously accommodate 35 students on the machine operation.
Relying on this platform, we can complete the teaching experiments, course design, production internship, graduation design and scientific research of communication and information majors. The platform can cover the following courses: access network technology, program-controlled switching, fiber optic communications, sdh, computer communication networks, information management and security, telecommunications signaling and communication protocols, multimedia communications, voice processing, image processing, communication principles, mobile communications, electromagnetic fields and electromagnetic waves. At the same time, the platform can support Huawei's optical transmission network and h3c network training and certification services, through the certification exams, can be issued the appropriate certification.
For the future development of the sub-laboratory, the teacher emphasized that innovation comes from practice, under the guidance of Premier Wen's "hard work, simplicity, truthfulness and pragmatism" as the purpose of running the school, to build the laboratory into a first-class, full-featured, society-oriented, innovative communications experimental teaching base.
2. Changfei Optical Fiber and Cable Company Limited
On September 3, we took the car early in the morning and rushed to the Changfei Optical Fiber and Cable Company Limited to visit the internship, in the hall, the relevant staff of the company introduced the company's profile.
Changfei company was founded in May 1988, by China Telecom Group Corporation, the Netherlands Drake Communications Technology Company, Wuhan Yangtze River Communications Group Co. The company is located in Wuhan East Lake Hi-Tech Development Zone, Guanshan Road 2, No. 4, covers an area of 150,000 square meters, the total number of employees of about 1,000 people, annual sales of close to 3 billion yuan, is now China's product specifications are the most complete, the most advanced production technology, the production of the largest fiber optic cable products, research and development and production base.
Since 1992, Changfei's production and sales of optical fibers and cables have ranked first in China for 16 consecutive years, with a total of 52.5 million core kilometers of optical fibers and 1.23 million skin-length kilometers of optical cables (36 million kilometers of optical fibers), and a total sales volume of more than 20 billion yuan. Products are exported to the United States, Japan, Southeast Asia, the Middle East, Africa and other more than 50 countries and regions, and among the world's second largest fiber optic producers and the fifth largest cable producers.
Since its establishment, Changfei has explored a successful road to revitalize the national industry through introduction, digestion, absorption and innovation.
The Research and Development Center, a department of Changfei specializing in the research of optical fiber and cable manufacturing technology, production process, manufacturing equipment and materials used in the products, has 13 PhDs and post-doctoral fellows, 54 masters, 103 undergraduates, and 22 senior technologists, who are dedicated to the development of the world's leading level of the new optical fiber and cable products and the development of the work.
Up to now, Changfei has obtained 109 nationally authorized patents, including 51 invention patents. At the same time, it has also obtained a number of U.S. patent authorizations.
At the same time, Changfei has also undertaken many national "Tenth Five-Year" research projects, the National Development and Reform Commission's information industry technology upgrading project, the national "863" project, the "Science and Technology for Trade" project, and the national fireworks project. "project, national torch plan project, Hubei provincial science and technology projects, the Ministry of Commerce "export mechanical and electrical products research and development" project, Wuhan City, science and technology projects, etc. Won the National Science and Technology Progress Award, the Hubei Provincial Science and Technology Progress Award, Wuhan City, Science and Technology Progress Award two, and participated in the International Telecommunication Union (ITU) It also participated in the formulation of ITU-T standard.
In addition, Changfei also vigorously carries out independent innovation infrastructure. It has been recognized as Hubei Postdoctoral Industrial Base, Hubei Provincial Enterprise Technology R&D Center, Hubei Optical Communication Material Engineering Research Center, National "863" Program Achievement Industrialization Base, China Information Industry Innovative Enterprise of the Year, National Enterprise Technology Center, and Wuhan Optical Fiber Communication Engineering and Technology Research Center.
Since 1992, Changfei has produced and sold 52.5 million core kilometers of optical fibers and 1.23 million skin-length kilometers of optical cables (36 million kilometers of optical fibers), with a total sales volume of more than 20 billion RMB. The production and sales of optical fiber and cable products have ranked first in China for 16 consecutive years, and ranked second and fifth in the world respectively.
In the domestic market, Changfei's fiber optic products and fiber optic cables are widely used in China Telecom, China Netcom, China Mobile, China Unicom, China Tietong, and other communication carriers, as well as in electric power, broadcasting and telecommunications, transportation, education, national defense, aerospace, chemical industry, petroleum, and medical care, with a national market share of more than 40%.
In the international market, Changfei has exported about 10 million core kilometers of fiber optic cable products. The products are exported to the United States, Japan, Southeast Asia, the Middle East, Africa and other more than 50 countries and regions, the international market share of more than 10%.
Along with the introduction of modern production technology, Changfei has also introduced modern management methods and systems, especially modern quality management procedures, so that every production link of Changfei is under strict and scientific quality control.
In 1993, through the comprehensive audit of Dutch kema company, Changfei became the first enterprise in the national fiber optic cable industry to obtain iso9002 international quality system certification.
In 2001, Changfei started the enterprise resource planning system by adopting the erp system, and carried out the whole process of quality control from the procurement of raw materials, contract evaluation, product production, delivery of finished products to after-sales service to ensure that the products, processes and services meet the needs of users.
In 2002, Changfei obtained the ISO9001:2000 international standard certification, which signaled that Changfei's quality management system had developed from the initial introduction and borrowing mode to a mode of self-improvement and continuous improvement.
By 2007, the length of its single heeled optical fiber prefabricated rods exceeded 2,000 kilometers, and was awarded the title of "China's top 500 manufacturing enterprises" and "China's fiber optic cable thirty years of the most influential enterprises" title.
Following the staff, we visited the production process of fiber optic cable related products, and had a good understanding of the entire production of prefabricated rods.
Since its establishment in 1999, Fiberhome Communications has taken the industrialization of multimode optical fiber as an important task and implemented a leapfrog development strategy. First of all, in the original pilot plant, by upgrading the performance of equipment, adding new pcvd equipment, improve process technology and other measures, it will make the annual production and sales of optical fibers in 2001 than in 1999 increased by 5 times. At the same time, in Wuhan? China's Optical Valley new optical fiber plant will soon be put into operation, in addition to large-scale production of single-mode optical fiber, but also the latest generation of pcvd equipment will be used to produce high-performance multimode optical fiber, production capacity will be based on the existing 4 to 5 times. In the research of new generation 50/125 blessing multimode fiber, dmd measurement is an indispensable technology. Fiberhome Communication has prepared for this, and the R&D personnel have collected and studied relevant technical data, purchased dmd measurement equipment, and conducted process research to eliminate rip defects.
3. Fiberhome Communication Technology Co., Ltd
Company Profile
Fiberhome Communication Technology Co., Ltd (Fiberhome) is a domestic outstanding information and communication equipment and network solutions provider, the Ministry of Science and Technology of the country recognized the domestic field of optical communications, the only "863" program industrialization base, "863" program, and "863" program. Fiberhome is the only "863" plan industrialization base in the field of optical communication recognized by the Ministry of Science and Technology of the People's Republic of China. China Optical Valley" leading enterprises.
Founded in 1999, Fiberhome was listed on the Shanghai Stock Exchange in 2001. Wuhan Institute of Posts and Telecommunications, the main sponsor of Fiberhome, is China's optical fiber communications engineering research center, the birthplace of China's optical communications. China's first optical fiber, the first optical communication project and a series of major scientific and technological achievements are developed here.
Fiberhome has mastered a large number of core technologies in the field of optical communications, and its scientific research foundation and strength, the conversion rate and benefits of scientific research results ranked first in the domestic industry, and participated in the development of national standards and industry standards more than 200. In recent years, Fiberhome has undertaken projects such as "40gb/ssdh Fiber Optic Communication Equipment and System", "Auto-switching Optical Network", and "Development of tbpsdwdm Transmission System" of National 863 Program. The R&D and industrialization of such projects as "Development of Transmission System" represent the country's impact on the world's leading scientific and technological technologies.
Fiberhome is the mainstream supplier of national basic network construction, its product categories cover optical network, broadband data, fiber optic cable three series,
Optical transmission equipment and fiber optic cable occupies the first place in the country, 100,000 sets of equipment in the stable operation of the network, more than 1 million kilometers of fiber optic cable equipped with the national basic fiber optic cable backbone network; on behalf of the industry's highest level of ulhwdm, 3.2tdwdm and ason systems are firstly applied in national level trunk networks of telecom operators; ftth is firstly matured for commercial use ...... innovative network equipment, perfect customer service and personalized solutions, continuing to create long-term value for customers. Fiberhome Communications adheres to the sustainable development of the industrial road, in the information network security, billing software, integrated business and other areas have also achieved remarkable results.
Fiberhome, in the spirit of "innovation, service, responsibility, *** with the development of" the spirit of enterprise, will further enhance the ability to capital management, asset operation, product development, market expansion, high-quality service, strong administrative capacity, the development of the main business around the cultivation of the core competencies and the overall advantage of the play, the "Fiberhome" brand to do more big, do fine, We will make the "Fiberhome" brand bigger, better and stronger, and open a new chapter for the research and application of communication technology.
Fiberhome has a first-class production base in Asia, with a total area of more than 80,000 square meters, including a modern production workshop for communication system equipment and optical fiber and cable manufacturing workshop. It has introduced more than 50 technical equipments and production lines with contemporary international advanced level, and its annual production capacity reaches RMB 5 billion.
R&D Strength
Fiberhome has long been focusing on the research and development of overall solutions for communication networks from core layer to access layer, and has undertaken the national "Eighth Five-Year Plan", "Ninth Five-Year Plan", "Tenth Five-Year Plan" and "Tenth Five-Year Plan" in the field of fiber-optic communication. Over the years, Fiberhome has undertaken most of the national "863" and "Keystone" projects in the field of fiber optic communications during the "8th Five-Year Plan", "9th Five-Year Plan" and "10th Five-Year Plan" periods, and has been advancing towards the realization of practical applications.
Fiberhome invests a large amount of scientific research funds every year, and implements the people-oriented talent strategy, with a large R&D group including Chinese Academy of Engineering Fellows, members of the ITU-T expert group, and young and middle-aged experts who have made outstanding contributions at the national level, so as to timely follow up on customers' needs and provide competitive and unique solutions to users' core interests.
In 2005, the fifteenth research project "40gb/ssdh fiber optic communication equipment system" passed the acceptance; 3.2t (80×40g) dwdm system representing the largest capacity in China was applied for the first time to the first level of trunk line project of China Telecom; "Fiber optic fiber" entered the trunk line market of the national level. "Fiberhome Fiber" entered the national trunk market and was commercially available on a large scale; ftth system was the first to be commercially available in China and was exported to overseas countries on a large scale;
In 2004, the ason system, which is completely independent of its own intellectual property rights, was successfully applied to Shanghai Telecom;
In 2003, the national 863 project "Research on wdm ultra-long-distance optical transmission technology" was completed and the project was completed. In 2003, the national 863 project "research and realization of wdm ultra-long distance optical transmission technology" passed the acceptance; the first set of ulh system with completely independent intellectual property rights was applied to the national level trunk line construction on a large scale;
In 2002, the 1.6td wdm system took the lead in large-scale application in the first level of the trunk line project of China Telecom; the representative of Fiberhome Communications was appointed as a representative in the metropolitan multi-service ring msr technology (xxsr technology) put forward by the International Telecommunication Union of China. service ring msr technology (x.87) was accepted by itu-t and recognized as technical specification of metro optical transmission network;
In 2001, oxc and oad systems were successfully applied in China's high-speed information demonstration network;
In 2000, Fiberhome put forward the first ITU ip standard (x.85/x.86) which was adopted by itu-t; opened China's first 32×2.5 gdm system; opened China's first 32×2.5 gdm system; opened China's first 32×2.5 gdm system. The first 32×2.5gdwdm (Guiyang-Xingyi) national trunk line project;
In 1997, opened China's first domestic 2.5gsdh (Haikou-Sanya) national trunk line project;
Before 1990, took the lead in opening a number of pdh national-level trunk lines such as Beijing, Hanzhou and Guangdao;
The first phase, from 1971 to 1980, was the research and development of multimode optical fiber. During this period, the international phase-out of the traditional double crucible process, the development of mcvd, ovd, vad, pcvd and other four new chemical vapor deposition prefabricated rod process; from the multi-component oxide glass fiber to quartz glass fiber; the study of multi-mode optical fiber transmission theory and optical fiber design, which is particularly important, the development of the analysis of the results of the measurement of differential mode delay (dmd) to optimize The key technology to improve the bandwidth of multimode fiber through the analysis of differential mode delay (dmd) measurement results was developed; field test of multimode fiber communication system was conducted; industrial standard of 50/125祄gradient multimode fiber (hereinafter referred to as 50祄-mmf), was established; and 50祄-mmf was put into large-scale production. Representatively, Corning's wilmington fiber optic plant was put into operation in January 1979 and at&t's atlanta fiber optic plant was expanded in April 1979 and put into operation in the following year.In 1980, the annual global fiber optic production was less than 100,000km, and 100% of which was multimode fiber. This was the beginning of the fiber optic industry. Over the next 20 years, annual mmf production increased rapidly, reaching 4 million km in 2000 (see Table 1).
The second phase, between 1981 and 1995, was the development period of the practicalization of multimode optical fiber and the continuous increase of new varieties. Internationally, 50祄-mmf has been used to establish a practical trunk fiber communication system. However, in the first few years of this period (1983 to 1984), the technology of single-mode fiber (referred to as g.652a fiber) matured, and the position of 50 blessing-mmf in the inter-office backbone fiber optic communication system was rapidly replaced by single-mode fiber. After that, 50祄-mmf was shifted to the field of data transmission, which was mainly used in local area network (LAN). At that time, in order to minimize the cost of the lan system, the inexpensive light-emitting diode (led) was commonly used as the light source without the expensive semiconductor laser (ld). the dispersion angle of the led was much larger than that of the ld, and the existing 50 blessing-mmf at that time had a small core diameter and numerical aperture, which was not favorable for the high efficiency of coupling with the led. In order to make the connection coupling easier and to make the optical power coupled into the fiber larger, the international community has vigorously developed gradient multimode fibers with larger core diameter and larger numerical aperture, such as 62.5/125 blessing, 80/125 blessing, 100/140 blessing, etc., with the core diameter increased from 50 blessing to 100 blessing, and the numerical aperture (na-value) increased from 0.2 to more than 0.3 (see Table 2), which is the best choice for the multimode fiber. The conditions were created for the popularization and application of multimode optical fiber in lan system. Shortly thereafter, most of the market share of 50祄-mmf was replaced by the newly emerging 62.5/125祄 gradient multimode fiber. 80/125祄, 100/140祄and other multimode fibers were not widely used due to the high bending loss, high cost of manufacturing, and special diameter of outer cladding and other reasons. During this period, multi-mode optical fiber gradually replaced the traditional copper wire and coaxial cable to become the preferred physical media for modern ultra-high-speed lan system.
The third phase, 1996-2002 period, multimode fiber research and development has entered the latest active period. The active period is expected to continue until 2010. During this period, lan system to gb/s above ultra-high-speed rate development. ieee in June 1998 adopted the gigabit ethernet standard; in June 2002 just adopted the 10gb/s ethernet standard. This ultra-high-speed lan system, the need to use lasers as a light source, and with a new generation of high-performance multi-mode fiber. In addition to the 10gb/s Ethernet standard, there are many industry standards that will use a new generation of multimode fiber.
Corning, the original Lucent ofs, the Netherlands draka have launched this new generation of multimode fiber samples. The introduction of various industrial standards for the development, production and application of this fiber provides a unified basis for more fiber manufacturers will be put into a new generation of multi-mode fiber development and production. It is expected that after 2002, will be a multi-mode fiber to obtain greater development of the golden age.
Fiber optic pre-prepared rod preparation, the current fiber optic core pre-prepared rod preparation technology of four processes **** exist, these four processes are external vapor deposition (ovd), vapor axial deposition (vad), improved vapor deposition (mcvd) and plasma chemical vapor deposition process (pcvd). The optical properties of fiber optic mandrels depend mainly on the mandrel manufacturing technology, while the cost of fiber optic preforms depends on the outer cladding technology. Today's optical fiber cladding manufacturing technologies include casing method, Alcatel (alcatel) invented plasma spraying method (plasmaspary), flame hydrolysis (soot) and Lucent Technologies invented sol-gel method (sol-gel method), of which soot is a generalized method The soot method is generalized to flame hydrolysis external deposition processes such as ovd and vad.
The mcvd method now uses external deposition technology to replace the casing method to make large prefabricated rods, forming a hybrid process combining the mcvd external deposition process, thus changing the traditional mcvd process deposition speed is low, poor geometric accuracy of the shortcomings of the mcvd process, reducing the cost of production, and improving the quality of the prefabricated rods. Since then, a number of companies have developed low-cost large-size casing process, casing preparation process for sol-gel and ovd method.
Prefabricated rod preparation process ovd method in the last two decades has developed from a single torch deposition to multiple torch deposition at the same time, the rate of deposition increased exponentially, and the realization of a device at the same time to deposit more than one rod, and from the sequential deposition of the core cladding made of prefabricated rods of the one-step method to the development of two-step method, that is, the first to prepare a large-diameter core rod, and then pulled into a small-diameter mandrels or do not pull the fine, and then the use of cladding technology to prepare a Fiber optic prefabricated rods, which improves the production efficiency and reduces the production cost. And, mcvd method, especially pcvd method, ovd and vad method is easier to accurately control the radial refractive index distribution of the core rod, and thus more effective for the preparation of multimode optical fiber mmf and non-zero dispersion optical fiber dzdf core prefabricated rods.
In the past 20 years, fiber optic prefabricated rod cladding technology has had many developments, the beginning of the early 1980's began to prepare fiber optic prefabricated rods with the casing method, so that the fiber optic prefabricated rod manufacturing process to achieve the transformation from a one-step method to a two-step method. The United States corning company first soot outsourcing technology instead of casing method applied to industrial production. 1990, alcatel plasma spraying technology and the United States lucent company developed sol-gel outsourcing technology instead of casing technology, thus using the casing method of fiber optic prefabricated vad manufacturing fiber optic mandrel manufacturers are Adopt soot outsourcing technology.
2. Dense WDM Optical Transmission System
The latest news released by the Institute of Communications in China, Fiberhome Communications "80 * 40gb / s dense WDM optical transmission system" project was awarded the first prize of the 2007 Chinese Institute of Communications Science and Technology.
Fiberhome is the first company in China to adopt nrz code for 40gb/sdwdm transmission; it is the first company in China to successfully apply Raman fiber amplifier technology to 80*40gb/sdwdm system, and it is innovative in the aspects of precise dispersion management, distributed Raman amplification, and osnr analysis software for unequal span distributed Raman amplification in 40gb/sdwdm system; Successfully established the first domestic and international expandable to 80*40gb/sdwdm ultra-high speed and ultra-large capacity optical transmission system in Shanghai-Hangzhou, loaded with actual services, and the whole line operates stably, which fills the blank in China. the successful development of the 80*40gb/sdwdm system and its engineering utility are important milestones in China's high-speed fiber optic communication development, which indicates that China's in the ultra-high-speed, ultra-high speed, ultra-large capacity, ultra-long transmission distance optical communication system research and development and productization gradually approaching or even exceeding the international advanced level. From catching up to surpassing, this is a solid step for China to become a communication R&D, manufacturing and operation powerhouse from a communication powerhouse.
3. Optical fiber communication
Transmission of light waves using transparent optical fiber. Efficiency and speed are far superior to wired electrical communications. Synchronous digital system (sdh) is a digital communication system in fiber optic communication system. It is a new set of international standards. sdh is both a networking principle and a set of multiplexing methods. sdh was created to overcome the shortcomings of pdh, there is a clear goal and then set specifications and then develop equipment. This can be the most perfect way to set the future communication network requirements of the system and equipment. sdh is the International Telecommunication Union ccitt in 1988 officially recommended, and known as the synchronous digital system. sdh is a very important standard, it is not only applicable to fiber optic communications, in principle, also applies to microwave and satellite communications.
Third, the future direction of their own efforts and the feelings of this
After two years of study in the school, we have mastered some of the basic theories and basic technology of the communications profession, out of the school door to the information industry for the internship, is very necessary.
Through this internship, they understand the basic knowledge of the communications profession, broaden their horizons, increase their knowledge, understand the simple principles of some communications equipment, but also understand the latest development of the industry, the usual book knowledge applied in practice, but also got a lot of valuable knowledge, the other side of their own also saw their own shortcomings, but also need to work hard to learn and understand! More related knowledge, enrich their own experience, more teachers, and relevant personnel, through various channels to learn and understand the relevant knowledge of communications engineering.
Through the internship, we have the opportunity to face the professional staff, listening to their professional explanation and personally see a lot of large-scale communications equipment, which is very helpful to our understanding of knowledge and practical connection, these are very beneficial to our work in the future. Through the internship, let me experience the position and role of communication in the development of national economy, deepen the perceptual understanding of communication engineering in production life, understand the rules of production and operation of these enterprises, learn the knowledge of the organization and management of these enterprises, consolidate the theories learned, cultivate the preliminary practical work ability and professional and technical ability, enhance my academic background in electronic information and the love of this profession.
This internship is a great opportunity for me to learn about the organization and management of companies.
This internship through a variety of forms I understand the current state of development of the communications industry and a bright future. Feel the information technology to bring a better life today, of course, I also want to dedicate myself to the cause of communication, focusing on the study of new mobile communication technology. Therefore, in the next year, when I choose to continue to pursue graduate studies, I should strive to engage in mobile communications research, so that I can grow up as soon as possible.