【正文】 pment prospects of the application of this technology will produce a qualitative leap in optical works. Development and Innovation Optical Network quartz fiber need to plete pound semiconductor equipment ponents, and silicon technology is advancing the field of optoelectronics and innovation in this field has been formed Silicon Photonics, the interdisciplinary science, as the silica Optical technology has laid a theoretical foundation, has bee the driving force to promote the rapid development of optical works. Since the mid8039。s wish for many physical properties, as its refractive index stability, and easy to control, in a silicon chip, passive ponents and lasers and sensors can be integrated in the movable support shelf, with SioB technology manufacturing optical density of integrated circuits are adequate for singlechip processing can produce a large number of chips, a variety of functions have been integrated on the chip. SioB technology has been widely used in integrated lasers, photoelectric sensor, no light guide fiber splitter, WDM filter, no light optical fiber and ball lens attached body, rotating mirror, optical steering devices and electrical product metals. From the mid90s, integrated photovoltaic technology started to apply munications work, such as Dragone router, a merger in the DWDM system and routing the optical wavelength channel IC has been developed from the 8channel 72channel, while the micro motor system (MEMS) is a small solid mechanical ponents, micromotor system can manufacture epitaxial growth, the pattern formation and etching processing, integrated circuit manufacturing technology in the substrate to plete, confident in the 21st century, the silicon microelectromechanical systems optical field of innovative technology, used in the near future, nextgeneration optical work. 2. Access Network The socalled access work is the exchange between the Bureau to the user terminal equipment, all machine lines (the physical location of the access work), in which the backbone system for traditional cable and fiber optic cable, usually several kilometers long。 the introduction of a few meters to tens of meters long lines often. ITUT requirements, access work refers to business contacts Interface (SNI) and the associated user work interface (UNI) a transfer between entities (such as the line facilities and transmission facilities) are formed to provide the necessary services for the transmission of data transmission capacity of the implementation of the system, it can be configured via the Q3 interface, and management. Transmission entities to provide the necessary carrying capacity of the transmission, signaling is transparent to users, no further treatment. It can be seen as nothing to do with business and application delivery work, mainly to plete crossconnect, multiplexing and transmission functions, usually without switching. The structure of work access methods, collectively known as work access technology, its work in connection with the user39。s existing 750 million access line to provide ultrawideband, is the focus of the current work technology, the bottleneck is relative, a pair of wire can support twoway conversation sufficient capacity, but the traditional copper wire can provide bandwidth, highperformance data work and the Inter is indeed some reluctance, and other data users not only want to talk through the video conference system and hope to see each other39。 the downstream direction can send ~ 6Mbps graphic images and broadband signals. Transmission distance up to 3 km to 4 km. ADSL39。s interactive broadband asymmetric transmission method, before pletion of the fiber access work, if you need to develop familyondemand TV, home teleeducation, telemedicine and other video services, the use of ADSL to solve broadband users business needs scattered, just use the existing copper wire of the transmission capacity without the need for transformation of the existing subscriber loop. But the ADSL broadband service is only as an excessive approach. VDSL is the view of the current ADSL technology to provide images in the broadband business is very limited and the high cost of economic weakness developed. Ordinary analog telephone line without change, the image signal by the end of HDT image interfaces by the Board to give the remote feeder fiber, the rate for STM4 or higher, the image operations can be either carried by the ATM cell of the MPEG Ⅱ signal, it can be a pure MPEGⅡ information flow. In the remote, VDSL line card can read the first letter or packet header and the desired cell or packet copy to the downstream direction of the destination user twisted pair. Remote transceiver module with an ordinary telephone service coupler (actually for a different frequency diplexer, also known as ordinary telephone service splitter) is responsible for a variety of signals coupled into the existing twisted pair copper. 19 Optical Access Technology Communication of large capacity optical fiber munication with high quality, stable performance, antielectromagic interference, strong confidentiality and so on. It has been widely reflected trunk munications. In access works, optical access will also be a focus of development. At present there are a variety of fiber optic access methods, namely: laying fiber to the remote contacts。 laying fiber to the curb。 laying fiber to every home. The main mode of optical fiber access to the trunk system and the wiring system at the junction point optical work unit (ONU) divided by location. ONU here is equivalent to the current subscriber line in the transfer box. From a technical point of view, FTTR, FTTB, FTTC, FTTZ basic approach, there is no substantive difference. From the operational point of view, the current volume of business the most, the most