Full optical VPN system based on orthogonal modulation code

Abstract

An all optical virtual private network based on quadrature modulation code type in optical fiber communication field includes an optical line terminal, a feeder fiber, a remote node, an arrayed waveguide grating, a profile fiber and an optical network unit. The optical line terminal includes a first circulator, a 2 is multiplied by 1 optical coupler, a fiber bragg grating, and a bidirectional optical amplifier. A first input interface of the 2 is multiplied by 1 optical coupler is connected with the interface of the first circulator. A second input interface of the 2 is multiplied by 1 optical coupler is connected with the fiber bragg grating with a plurality of cascades. An output interface of the 2 is multiplied by 1 optical coupler is connected with an interface of the bidirectional optical amplifier. The other interface of the bidirectional optical amplifier is the output interface of the optical line terminal. The invention realizes simultaneous transmission of the up date and the virtual private network data of each optical network unit, with high communication efficiency and simple dispatch. At the same time, the bidirectional optical amplifier effectively compensates optical power loss and increases user amount.

Description

technical field [0001] The invention relates to a system in the technical field of optical fiber communication, in particular to an all-optical virtual private network system based on an orthogonal modulation code pattern. Background technique [0002] Utilizing the existing low-cost optical devices, the passive optical network (PON) has become the preferred solution for users to realize broadband access because of its simple structure and low cost. Traditionally, it uses a tree topology, where an Optical Line Terminal (OLT) or Central Office delivers services over a long fiber to a Remote Node (RN), where the optical power is split and further transmitted to many optical networks Unit (ONU), each optical network unit can provide services for multiple users. In order to further improve the flexibility and reliability of the network, it is necessary to support the internal communication of the optical network unit and establish an all-optical virtual private network (VPN). ...

AI Technical Summary

Problems solved by technology

However, there are the following disadvantages: due to the high loss caused by the two 1:n+1 couplers and n Mach-Zehnder modulators (MZM) contained in the dynamic reflector, it limits the reception of each optical network unit (ONU). The power of the received optical signal leads to a limited number of users it can support and poor scalability; the uplink data and virtual private network data transmitted by the optical network unit must be sent in turn in a time-division multiplexed manner, which affects the data and the dynamic reflector Scheduling is more complicated, communication efficiency is not high

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