Dual-wavelength Packets Buffering in Dual Loop Optical Buffer
|School||Beijing Jiaotong University|
|Keywords||All-optical packet switching network Dual-loop optical buffer Semiconductor optical amplifier Cross phase modulation Multi wavelength|
Buffering is an effective method to solve the packet contention in optical domain without the conversion of ’optical-electronic-optical(O/E/O)’ and all-optical buffer becomes the key component in optical switching node.The all optical buffer which is based on dual loop optical buffer is a novel optical buffer.The optical buffer has the advantages of stableness,compactness,low cost and easy implementation.Most of past optical buffer are experimentally demonstrated for the single wavelength,low speed signals buffering or using a frequency-routing-type time division interconnection network.The rapid growth of IP and multimedia services are driving demand for high capacity and high speed optical networks.Multi-wavelength optical buffer is more required to be investigated.In this paper,we focus on the dual-wavelength signals buffering in optical buffer based on DLOB.These conclusions can also be applicable for all the other SOA based re-circular all-optical buffers.What I have done are as follows:1.We do the research on the gain character of SOA for dual-wavelength optical signals. The experimental results prove the correctness of theory analysis.2.We do research on 2.5Gb/s and 10Gb/s dual-wavelength data packets buffered in DLOB3.When buffering the dual wavelength signals,the nonuniform input power between bit "1" and "1+1"will induce unbalanced power gain inside the packet.It is impossible to store all dual-wavelength bits at the same time in this case.We solve this problem by making SOA work at its saturation point(165mA) where all bits power will be approximately equal.This is so called "power equalization"