Microwave-photonic-filter-based raman suppression system of optical access network

Abstract

Disclosed in the invention is a microwave-photonic-filter-based raman suppression system of an optical access network. The system is composed of an optical line terminal, a feeder type fiber, an optical remote node, a plurality of distributed fibers, and a plurality of optical network units. The optical line terminal is connected to the optical remote node by the feeder type fiber; the optical remote node is connected with the optical network units by the distributed fibers. According to the invention, with a cascaded semiconductor optical amplifier, on the one hand, the power of the downlink signal is amplifier; and on the other hand, pretreatment on the low-frequency component of the signal is realized by using the high-pass attribute, namely, microwave photonic filer, at the deep saturation area, so that the raman scattered noise influence on the existing optical transmission system by the next-generation optical access network system is reduced. No extra high-speed electric processing module is required and multiple purposes of one signal device is realized, so that the system cost is reduced to the certain extent.

Description

technical field [0001] The invention relates to the field of communication technology of optical access network, in particular to a Raman suppression system of optical access network based on microwave photon filtering. Background technique [0002] With the continuous improvement of social informatization, emerging services such as IPTV, high-definition video, mobile multimedia, and wireless data backhaul and fronthaul continue to emerge, and terminal users have higher and higher requirements for access bandwidth. However, the user access network (wired / wireless) as the "last mile" develops slowly, which directly affects the service capacity, quality, speed, and development and utilization of network resources that the communication network can provide, and becomes a constraint on the development of the entire network. the bottleneck. At the same time, as an important asset for the survival of mobile operators, the radio access network (RAN, Radio access network) is facing...

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Problems solved by technology

[0007] The purpose of the patent of the present invention is to provide an all-optical Raman suppression system for optical access networks based on microwave photon filtering to solve the problem of the Raman scattering noise suppression scheme in the existing access network system

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