Analysis And Research On The New OADM

With the development of information society, all kinds of digitalservice request more and more high in communication network capacity. Thetraditional voice business has begun to gradually turn to the data,multimedia and other services. In order to meet the higher bandwidthrequirements, making full use of a fiber-optic ultra-wide bandwidthresources will inevitably become the trend of the future. Wavelengthdivision multiplexing technology (WDM) is the good way to solve thisproblem. The efficiency of the bandwidth utilization is greatly improvedby the utility of the WDM of the optical fiber.In the future, optical fiberbandwidth efficiency will reach higher levels. Optical switching devicesin the system due to the limitations of electronic bottleneck willinevitably become an important factor of restrictions on network rate inthe future. For this reason, all optical communication network conceptemerged as the times required. All-optical communication network, thatis, the whole process of transmission of transmission is in the opticaldomain. This all-optical communication system development can not beseparated in the optical domain layer of the download manager on theoptical signal optical add-drop multiplexer (OADM). The all-opticalcommunication system development can not be separated from opticaladd-drop multiplexer (OADM) which is a device of download the opticalsignal in the optical domain layer. OADM is one of the WDM key devices.In multiple nodes of of optical communication network,OADM is in theintermediate node. OADM is used to download one or several road lightsignal, at the same time, the local user sends a light signal into amultiplexed optical channel through it. The basic requirements of the OADMis that it can meet the download function of the signal and ensure that the other wavelength optical signal without obstruction by.In the first chapter of this paper, we discuss the background andsignificance of the thesis and give a brief introduction to the five basictypes of OADM and a brief description of the development in the world ofOADM. In the second chapter, we introduce the development process of fibergrating, advantages, type,and working principle and then give the OADMmain performance index meaning and calculation method.The performance ofthree kinds of OADM based on fiber Bragg grating structure, advantagesand disadvantages are analyzed by OptiSystem optical communicationsoftware. The third chapter introduces the working principle of magnetictuning fiber Bragg grating, the linear relationship between FBG Braggwavelength and the optical fiber Bragg grating lateral stresses and therelationship between the expansion of the giant magnetostrictive rod andcontrol of spiral current. Based on the two magnetic tuning of fiber Bragggrating OADM performance is simulated and analyzed. In seamless coverageof C band41standard wavelength, the magnetic tuning optical fiber rasternumbers and in natural extended state each fiber Bragg grating wavelengthare given. Finally, the OADM of the seamless coverage of C band16commonlyused wavelengths is imulated and analyzed.Results show that:OADM basedon the magnetic tuning fiber Bragg grating has the advantages ofconvenience than common OADM based on fiber grating tuning OADM. Whenthere is a need to download the multiplexed optical signals, common OADMbased on fiber grating tuning need a lot of optical circulators. The OADMbased on the magnetic tuning fiber Bragg grating can overcome the highexpense and great insert loss. In the fourth chapter, photonic crystalsand photonic crystal filter characteristics are introduced. The photoniccrystal is analyzed by the transmission matrix method, therefore, thismethod is derived. Subsequently, photonic crystal is analyzed throughprogramming with the MATLAB software. We Mainly analyzes the followingaspects: bandwidth effects of two refractive index ratio of one dimensional photonic crystal, different optical thickness cycle of onedimensional photonic crystal on the band ’s influence, cycle number ofone-dimensional photonic crystal on the influence of bandwidth, thethickness of defect layer on the defect mode influence and the angle onthe defect mode effect. Based on the above analysis, we has carried onthe analysis, design and optimization on photonic crystal narrow-bandDWDM filter. Finally,the OADM based on the photonic crystal filter issimulated and analyzed. Results show that: the OADM based on photoniccrystal filter has some advantages such as high channel isolation, lowcrosstalk, and small insertion loss.And, the OADM based on photoniccrystal filter has a wider tunable range than OADM based on fiber bragggrating.