Method for protection switching of optical network and device thereof
A technology for protection switching and optical network, applied in the field of optical network, it can solve the problems of affecting service transmission, unable to monitor the signal power of wavelength channel, and the power is not the same, so as to ensure normal transmission and avoid the phenomenon that services cannot be transmitted.
Active Publication Date: 2014-09-24
ZTE CORP
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Problems solved by technology
[0003] The existing optical network protection switching in the prior art has the following defects: since only the total power after multiplexing of the working channel and the protection channel is monitored, the power of each wavelength channel signal cannot be monitored
However, in a wavelength division multiplexing system, the multiplexing section generally needs to transmit 40 to 96 wavelengths, and the transmission power of each wavelength channel laser, the channel insertion loss difference of the multiplexing and demultiplexing unit, the gain flatness of the amplifier, noise and Influenced by various factors such as linear effect, the power of each wavelength channel in the optical fiber is not the same, so the total power in the channel may be higher than the protection threshold, but the power of some wavelength channels is already lower than the protection threshold.
The existing technology cannot perform protection switching for this, which ultimately affects the normal transmission of services
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[0034] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0035] see figure 1 , the present invention proposes an embodiment of a method for optical network protection switching, including:
[0036] Step S101 , low-frequency modulation is performed on each channel of wavelength signals, and labels are loaded on each channel of wavelength signals. In this step, the depth of low-frequency modulation for each wavelength signal is the same, for example, the modulation depth for each wavelength signal is controlled within 5%.
[0037] This step specifically includes the following processing: setting a corresponding frequency as a label for each wavelength signal, generating a corresponding electrical signal for each frequency, and modulating each electrical signal into a corresponding wavelength signal. Different frequencies are set for wavelength signals of different channels....
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The invention discloses a method for protection switching of an optical network, which comprises the steps of: performing low-frequency modulation on wavelength signals, and loading labels on the wavelength signals; combining the wavelength signals, dividing to a working channel and a protecting channel, and detecting total power values of the wavelength signals of the working channel and the protecting channel; and determining whether protection switching operation of the optical network is performed according to the wavelength signal total power values of the working channel and the protecting channel and the wavelength signal power values which respectively correspond with the working channel and the protecting channel. The method and the device provided by the invention prevent incapability of transmitting business because of abnormal power value of partial single wavelength signal in the working channel and ensure normal transmission of the business.
Description
technical field [0001] The invention relates to the technical field of optical networks, in particular to a method and device for optical network protection switching. Background technique [0002] The optical network protection switching system is an important part of the optical communication system. Accidents such as optical cable cut, equipment failure, or optical connector being pulled out will cause service interruption. Therefore, it is very necessary to configure a protection channel to ensure the normal transmission of services in the important service transmission section. Traditional optical network protection switching is realized by separately monitoring the power of the working channel and the protection channel, and comparing the difference between the two to decide whether to start the protection switching. When the power of the working channel is lower than the protection threshold and the power of the protection channel is higher than the protection thresh...
Claims
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IPC IPC(8): H04B10/038
Inventor 梅君瑶王磊朱晓宇
Owner ZTE CORP