The application of DWDM technology
At present, with the Internet and multimedia technology rapid development and IP business explosive growth, people put forward unprecedented for broadband communication. However, so far, the available bandwidth resources 200nm fiber by less than only 1 / 100,99/100 stand-to mining resources. How to make effective use of the advantage of optical fiber communication bandwidth is the most concern. Therefore, many electronics and based on mature technology has been widely applied to come, reuse tl9000.we reference is successful technology. Theory and practice has proved, by constructing information technology as the recovery of the highway, is an important technology in the past, present and future of optical communication system, and the development of the network, to fully excavate the potential huge transmission capacity of fiber, will play a very important role. In order to better use and recovery in technology, optical wavelength complex technology, light at the OWDM OTDM multiplexing technique, optical code division multiplexing technique OCDMA, optical frequency division multiplexing technique OFDM, light air OSDM multiplexing technique, OSCM multiplexing technique as deputy carrier technology to develop a more in-depth study. One DWDM (DWDM) is today's rapid development, mature technology, it is a kind of technology in a fiber and bolt to send more wavelength signal.
DWDM principles outlined
So-called DWDM (DWDM)
is a kind of wavelengths (or frequency) wavelength multiplexing
technique, namely: at present in order to make full use of single-mode optical fiber 1.55 um, low loss area, the huge bandwidth resources according to the different wavelength or frequency of fiber, low loss will be divided into light waves, each word set as the carrier, in a sender by using device (restoration) will be different wave of wavelength modulated signal light prescribed combined into a fiber. In the receiver, again by a photodissociation multiplexing (points) wave of these different wavelength modulated signal light in different load in a separate, which can realize the multiple optical fiber transmission, the light signal 1550nm window DWDM cable systems. According to the regulation, ITUTG. 692 Suggestions 100GHz interval channel (0.8 nm) integer times. Now people have new experiments produces more small interval.
1.1 DWDM advantage
In order to make full use of the huge bandwidth optical fiber transmission of resources, increase capacity, DWDM (DWDM)
technology as the core of the new generation of optical fiber communication technology has been produced. Has the following characteristics:
(2) System upgrade can maximize existing investment protection.
(3) High reliability and flexibility of networking.
(4)Compatible all-optical exchange.
1.2 The advantage of DWDM optical network
The basic structure of DWDM
optical network type has star, bus-control (ring) and the tree of, can mix into various complex network structure. Optical networks can be divided into core, transverse metro/between local networks and access. The core nets tend to use mesh structure, metro with annular structure are presented /, access is circular and star combination of composite structure. Optical network can also for the customer, optical channels (OCH), with period OMS (restoration) and light transmission section (OTS), etc. Two adjacent layer between customer/service relationship.
1.3 DWDM key technology
The technology as the signal DWDM carrier, after the sender using WDM
device will different provisions of wavelength modulated signal light combined into a fiber. In the receiver, again by wavelet decomposition multiplex will these different wavelength modulated signal light in different load. Separate Along with the development of technology, has realized wavelength interval, and even smaller and more a wavelength multiplexing. DWDM systems photoelectric device include lasers, WDM device and fiber amplifiers.
[ Author: Flyin webmaster] [ Date: 2011-3-25 ] [ Hits: ]