Method for multiplexing optical marker by co-channel subcarriers

Abstract

This invention relates to a commom sub-carrier moultiplex optical mark method fixing and assisgning certain wavelengths of optical mark communicaltion network the mark wavelengths and further use thesubcarrier multiplex technology to realize multiple parallel common mark channels. Each mark channel is shared by every load wavelength and multi-data packet marks can be parallel delivered at the same time on time domain. The mark information passes through the data wavelength label domain, corresponding to the related data packet to realize the exchange of the data packet and plug-in of the newmarks. This invention uses the theory of frequency division multiplex to realize the extraction and rewriting of optical marks using band-pass filters directly in optical domain and electric domain with simple and mature technique.

Description

Technical field: [0001] The invention relates to a method for multiplexing optical marking with sub-carriers on a common path, which solves the sending, transmission, extraction and rewriting of optical marking information in an optical marking switching communication network, and belongs to the technical field of optical communication. Background technique: [0002] With the development of the communication network, transferring the switching function from the electrical domain to the optical domain helps to solve the "electronic bottleneck" problem of optical / electrical / optical conversion. Since optical cross-connection equipment and optical fork multiplexing equipment are based on wavelength switching, the switching of services is still mainly completed by the core router, and the switching method is based on the form of electricity, which needs to receive high-speed signals and decompose them into low-speed parallel signals. Using multiple processors for processing is a ...

AI Technical Summary

Problems solved by technology

Multi-wavelength optical marking is to use multiple wavelengths to transmit marking signals within the wavelength interval specified by the ITU. The spectrum can be separated or overlapped in the frequency domain. The disadvantage of this technology is that the utilization rate of wavelength resources is low. Since the marker and the payload can overlap in the frequency domain, a guard interval is still required between the marker and the payload

In addition, in large-scale networking, this technology has problems such as high cost and complex node design.

Dedicated control wavelength channel, generally uses a dedicated 1510nm wavelength as the channel for network marking and control information, and is used to transmit optical marking information. This technology also requires a complex synchronization mechanism

The technologies of high-intensity pulsed light marking and electro-optical modulation light marking use the nonlinear effect of semiconductor optical amplifiers and the electro-optic effect of electro-optic crystals respectively, which have some inherent defects and are difficult to be practically applied in communication networks.

[0004] From the published data, various optical marking technologies either require complex synchronization structures, which increases the complexity of network design, or affect the load during the modulation, transmission, extraction and rewriting of marking information, increasing the load. The power cost and other issues have certain defects