Queue-type all-optical buffer

Abstract

The invention relates to a queue-type all-optical buffer, which belongs to the field of all-optical packet switching. The queue-type all-optical buffer is characterized in that the queue-type all-optical buffer is formed by cascade connection of a plurality of optical buffer units, and uplink output ends of each stage of the optical buffer units are sequentially connected with downlink input ends of the last stage, thereby constituting an uplink channel. Data packets which are input to each stage of the optical buffer units are determined to carry out the uplink output or the buffer at the stage by a control signal input end. A control signal output end of any i stage of the optical buffer units is connected with the control signal input end of the i+1 stage of the optical buffer units, thereby avoiding the situation that the i+1 stage of the optical buffer units output data to the i stage of the optical buffer units when the i stage of the optical buffer units have the buffer data packets. When two data packets simultaneously achieve the buffer, the data packet with high priority is directly output and the data packet with low priority is stored in the buffer. The queue-type all-optical buffer has the queue characteristics of first-in first-out and last-in last-out, can simultaneously process two data packets and has the advantages of easy expansion of storage capacity, no need of external control signals and the like.

Description

technical field [0001] The invention belongs to the technical field of information optoelectronics, in particular to an all-optical buffer in an all-optical packet switching network. Background technique [0002] In recent years, optical communication networks have developed rapidly. With the sharp increase in bandwidth requirements, high speed, flexibility and good scalability have increasingly become the development direction of next-generation optical networks. Modern optical networks are no longer just satisfied with the use of optical fibers to transmit signals. Some tasks that were originally completed in the electrical domain after photoelectric conversion, such as switching, routing, storage, forwarding, etc., are gradually being introduced into the optical domain, using all-optical signals The processing method implementation. Among them, the all-optical packet switching technology is considered to be one of the most potential all-optical network solutions because ...

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Problems solved by technology

[0008] But the stacked all-optical buffer also has its disadvantages: first, the stacked all-optical buffer is a first-in-last-out and last-in-first-out stack structure in structure, which causes that when the network is busy, the data that arrives later Packets are sometimes output first; secondly, because of the first-in-first-out and last-in-first-out stack structure, the original cached data packets will be transferred to the bottom of the stack, and each transfer will deteriorate the signal-to-noise ratio of the data packets, Therefore, when the network is busy, the deterioration of data packets arriving at different times is different; third, at least 6 active devices are required to cache a data packet, and the complexity and cost of the system are relatively high

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