NXN light exchanging structure in full photo exchanging nodal point

Abstract

This invention relates to a NxN optical exchange structure for all-optical exchange nodal points composed of 2n stages, in which n=log2N characterized by a "on / off" gate of a semiconductor amplifier between nth stage and n+1th stage forming 2n+1th stage; or different numbers of semiconcutor optical mplifier "on / off" gates can be designed in any second stage optical switches according to specific need. This invention uses restructured enlarge Bense optical exchange structure to limit the rrosstalk. A semiconductor optical amplifier "on / off" gate (SOA gate) is added to a NxN enlarge Bense optical exchange structure with equivalent variance to the route. The invention reserves good performances of the enlarged Bense optical exchange structure; generalized unblockness, optimality of the hardware, and reduced crosstalk.

Description

technical field [0001] The invention belongs to the technical field of optical communication devices, and in particular relates to an N×N optical switching structure used in all-optical switching nodes, which is especially suitable for (DWDM) systems, and can solve the crosstalk problem. Background technique [0002] With the continuous development and wide application of IP technology, the capacity and rich and colorful business volume of optical communication are showing an exponential growth trend. The optical network based on dense wavelength division multiplexing (DWDM) technology has been recognized as the most effective way to alleviate the increasing communication capacity. The establishment of an optical network and the information exchange between channels will inevitably introduce all-optical switching nodes into the topology of the network. An all-optical switching node is generally composed of a wavelength division multiplexer (MUX), an optical switch (Optical...

AI Technical Summary

Problems solved by technology

[0024] There are many ways to eliminate crosstalk. At present, the methods of eliminating crosstalk at home and abroad mainly include: (1) Through the design of the network node topology, the amount of crosstalk is converted from low-order to high-order, thereby eliminating the impact of crosstalk on the transmission system to a certain extent. However, it will inevitably lead to the complexity of network nodes and the increase in the number of passive devices, and the cost of a single network node will also increase.

(2) Reduce crosstalk by focusing on improving the performance of passive devices in network nodes, which will inevitably increase the cost of devices, and at the same time, crosstalk cannot be well eliminated when the scale of switching nodes is large

(3) By scrambling the transmitted optical signal and its phase, this will lead to system complexity and is only suitable for local networks

Thereby above-mentioned method all can not thoroughly eliminate the crosstalk in the DWDM optical communication system, and its method for eliminating crosstalk mostly considers from one side: on the one hand they only consider the topological structure of the network; device performance to reduce crosstalk

However, none of them are integrated with the DWDM system, so the degree of reduction of crosstalk is also limited.

Images