A Low Overhead High Survivability Pon Protection Structure

Abstract

The invention relates to a low-expense high-survivability PON protection structure, and belongs to the technical field of optical networks. A plurality of different functional units of logic decision, backup transmitting-receiving, protection path control, and the like are additionally arranged in an optical line terminal; the switching of an optical switch is confirmed by the logic decision unit according to received logic signals; protection wavelength of a faulty component is tuned by the backup transmit-receive unit to enable a WDM part to conduct switching operation just on the faulty component to realize low expense concentrated protection; a cross concentration line structure is adopted at a TDM part; quick distributed protection switching is realized when ONU detects fault. According to the invention, the number of components participating in the protection switching in the WDM / TDM-PON system is effectively decreased; influence range of the fault is reduced; protection resource expense on the fault is reduced; full protection to all optical fiber fault in the whole system is realized.

Description

technical field [0001] The invention belongs to the technical field of optical networks, and relates to a next-generation wavelength division multiplexing time division multiplexing hybrid passive optical network (WDM / TDM-PON) fault protection technology in optical networks, in particular to a low-overhead high-survivability PON protection structure. Background technique [0002] With the development of the economy and the advancement of science and technology, people's demand for various information is increasing day by day, which puts unprecedented pressure on the data carrying capacity of the existing network, resulting in the next generation of high-bandwidth, large-capacity, low-cost and smooth upgradeable hybrid wireless network. The introduction of source optical network WDM / TDM-PON has become an inevitable trend. Correspondingly, it is very important to improve the survivability of hybrid passive optical network. Fault protection and recovery is the guarantee for th...

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Problems solved by technology

[0006] In view of this, the present invention proposes a low-overhead and high-survivability PON protection structure for traditional PON fiber faults where many components participate in protection switching and high protection resource overhead. This structure is newly designed in the optical line terminal Multiple different functional units enable the WDM part to perform switching operations on only the faulty part of the device, realizing low-overhead centralized protection; the TDM part adopts a cross-bus structure to realize fast distributed protection switching, effectively reducing The impact range of the fault is reduced, and the protection resource overhead of the fault is reduced

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