Self-adaptive elastic ring optical buffer for variable length optical packet

Abstract

A self-adaptive elastic ring optical buffer for a variable length optical packet includes an annular structure consisting of basic buffer units with different buffer delays, wherein the on / off state of the basic buffer unit determines whether the optical packet is buffered in the unit, and the on / off control optical packet at the outlet is continuously buffered or read out. The selection of the number of turns of the buffer and the buffer unit can enable the self-adaptive elastic ring optical buffer to be adapted to optical packet buffer with arbitrary lengths, thereby obviating the restriction of a feedback structure on the length of the optical packet. In addition, the self-adaptive elastic ring optical buffer has larger buffer delay change range, bidirectional delay dynamic reconstruction capability, optional delay budget and more compact structure in comparison with a feedforward structure. The separated read-write control and the annular structure can ensure the optical packet in the buffer to be directly read out without influencing the buffering optical packet, so that the cascade structure has a plurality of queuing functions. Based on fiber delay line and SOA gain switch, the self-adaptive elastic ring optical buffer also has the advantages of nanosecond-scale reconstruction capability, lower ASE noise accumulation and power loss, low cost, high stability, simple implementation, etc.

Description

technical field [0001] The invention relates to an optical buffer based on an optical fiber delay line, especially an adaptive elastic ring buffer structure capable of adapting to different optical packet lengths. The optical buffer is a key component for realizing a high-performance all-optical packet switching network, and belongs to the technical field of optical communication. Background technique [0002] The optical buffer is used to realize the temporary storage function of signals in optical information processing, and is a key component for realizing high-performance packetized optical switching nodes. In a packetized optical network, the all-optical buffer is not only the most effective means to solve the problem of optical packet congestion, realize traffic engineering and ensure QoS, but also realize node label extraction and routing selection, line-speed read-in and variable-speed read-out, and optical An essential component for group synchronization and other ...

AI Technical Summary

Problems solved by technology

However, multiple cycles of the optical signal in the reflection path of the loop or FP cavity lead to the accumulation of ASE noise; the fixed loop length limits the length of the optical packet (in order to ensure that the head and tail of the optical packet do not overlap, the packet length must not be greater than the corresponding loop length); in order to meet the buffer requirements of the longest optical packet in the network, only the loop length or the reflection path length of the FP cavity can be increased, but this increases the minimum granularity T of the cache, resulting in poor cache flexibility

When the network is upgraded or changed, the feedback structure needs to change the length of the entire optical fiber in the cache, so the upgrade ability and adaptability are poor

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