Hybrid waveband/wavelength switching in intelligent optical networks is gaining more and more academic attention. It
is very challenging to develop efficient algorithms to efficiently use waveband switching capability. In this paper, we
propose a novel cross-layer routing algorithm, waveband layered graph routing algorithm (WBLGR), in waveband
switching-enabled optical networks. Through extensive simulation WBLGR algorithm can significantly improve the
performance in terms of reduced call blocking probability.
Checking the great generator's vibration online is difficult because of its strong electric and magnetic field so it needs had better no metal in the sensor. We introduce a method of measuring vibration by using FBG and demodulating it by blazed grating and it doesn't use any metal. We present the design method and the theory of
demodulation. The results of the experiment show that the vibration amplitude of the exciter matches the detected signal under the stable frequency. The experiment also successfully separated the temperature shift and vibration signal.
Giving a new method to tuning a fiber Bragg grating into a chirped grating using a gradient curvature beam. Stick a FBG to an "S" shape beam with one end free and another give a pull. The curvature of the beam would change and the FBG get gradient strain. Thus we get the chirped grating while the central wavelength doesn't change. The design method and the theoretical analysis are given. The maximum chirped bandwidth in our experiment is 5.10nm and the central wavelength does not change.
A novel waveband switching node architecture is proposed using tunable optic filters for arbitrary waveband add/drop. The simulation results show this new architecture achieves lower blocking probability and reduce the scale of ports at switch fabric.
Waveband switching routing is a new problem for research community. It is has some different with the routing of wavelength assign problem. In this paper, we propose a new ideal for agent based Waveband switching network construction. Primary simulation shows that in this way complexity of virtual network topology and blocking probability reduced.
A novel hybrid WDM/TDM optical access network architecture called wavelength shared WDM PON and its media access control mode is proposed. The system is based on a two-stage distribution tree connecting OLT and ONUs.and uses ALOHA protocol for control channel and FIFO scheduler to efficiently assign bandwidth. The packet delay in the system is analyzed and the numerical results demonstrate that the system possesses well performance of packet delay.
In this paper, the guideline of wavelength assignment for WDM distribution networks is studied and a novel wavelength assignment algorithm is proposed. The numerical and simulations results demonstrate that this algorithm can improve the system's performance.
The transmission spectrum of the phase-shifted and apodized long-period fiber grating with different parameters is calculated and analyzed based on the fundamental matrix approach. This paper presents the design method of phase-shifted optimum, which uses the nonuniform phase-shifted method to optimize the transmission spectrum
of long-period fiber grating. Compared with uniform phase-shifted and apodization method, this method can effectively remove the sidelobes near the resonant wavelength. The calculation and analysis results show that it is an effective design method compared with the design method of apodization optimum.