Frequency hopping period optical coding and decoding method and optical coder decoder

Abstract

The invention discloses a frequency hopping period optical coding and decoding method, which is used for monitoring optical fiber links of a passive optic network. According to the frequency hopping period optical coding and decoding method, the coding and decoding are simultaneously performed in time domains and frequency domains; and optical code words are periodically coded and decoded in the time domains and are coded and decoded in a frequency hopping way in the frequency domains. The invention also discloses an optical coder decoder for realizing the coding and decoding method and a method for monitoring the optical fiber links of the passive optic network. The optical coder decoder consists of a plurality of optical fiber Bragg optical gratings which are connected in series through optical fiber delay lines; the optical fiber delay lines among the optical gratings have the same length, and the length depends on the period values of the frequency hopping period optical code words and the width of the time domains of detection optical pulse; and the center reflection wavelength of each optical grating depends on frequency hopping sequences on the frequency domains. In the method for monitoring the optical fiber links, the frequency hopping period optical coding and decoding method is adopted. According to the methods, code word capability of the optical code words can be improved, related distance of the optical code words can be reduced, the multi-user interference and beating noise can be effectively restrained, and the system monitoring performance can be improved.

Description

technical field [0001] The present invention relates to an optical codec method and an optical codec, in particular to a frequency-hopping cycle optical codec method and an optical codec for passive optical network (PON) fiber link monitoring, belonging to optical fiber communication technology field. Background technique [0002] As the passive optical network (PON) is widely used in the optical access network, more and more attention is paid to the monitoring of the status of the optical fiber link in the optical network. At present, the performance monitoring of the optical network mostly exists in the management system of the ONU. The management and control interface of the ONU can provide a lot of system status information through the communication between the OLT and the ONU. However, when the physical layer of the PON network fails, the OLT Unable to exchange any data with ONU. Therefore, it is difficult for the operator to judge whether the problem comes from the o...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of large correlation distance and low spectrum utilization rate in the prior art of two-dimensional optical orthogonal coding, and to provide a frequency-hopping cycle optical encoding and decoding method and an optical encoding and decoding device

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