采用动态波长分插复用器的光突发交换环网中的控制协议研究

提出了一种光突发交换(OBS)环网控制协议——延迟光突发固定周期(DBFP)协议。它采用动态波长分插复用器(WADM)。即采用波长可调发送可调接收(TTTR)机制．通过提前的光突发控制分组(BCP)．为光突发数据分组(BDP)预留资源，并利用固定长度的光纤延迟线(FDL)将突发数据包延迟同定的时间，以便等待所有已经预留的突发数据包发送完毕，从而完全避免突发数据包冲突问题。仿真结果表明。延迟光突发固定周期协议能完全避免突发数据包冲突。同时有效地实现了波长统计复用、按需分配和空间重用，波长重用效率高达160％。从而提高链路利用率．特别适合于突发性的业务；并且延迟光突发固定周期协议所引入的时延为1ms左右．对业务的影响不大。

Study of Control Protocol in Optical Burst Switching Ring Network with Dynamic Wavelength Add-Drop Multiplexer

A kind of optical burst switching (OBS) ring access control protocol—delay optical burst with a fixed period (DBFP) protocol is proposed, which uses dynamic wavelength add-drop multiplexer (WADM), i.e. uses wavelength tunable transmitters and tunable receivers (TTTR) mechanism. The wavelength resource is reserved by the control packet transmitted in advance. And every optical burst is delayed a fixed period with a fixed length fiber delay line (FDL) at every intermediate node to let all reserved bursts accomplish transmitting, in order to avoid colliding with reserved local access bursts. The result of simulation shows that DBFP protocol can statistically multiplex wavelength efficiently, can allocate wavelengths during in required period on demand, and can reuse wavelength at space domain, and that the wavelength reuse efficiency is up to 160%. Therefore, the proposed DBFP protocol enhances network performance and increases the link utilization, which adapts for bursty traffic, specially. Meanwhile, the delay introduced by DBFP protocol is small, for example, is about 1 ms for optical burst multiplex ring network with 10 nodes. So the delay is neglectable.