Title :
An Efficient Approach for Time-Domain Simulation of Pulse Propagation in Optical Fiber
Author :
He, Kan ; Li, Xun
Author_Institution :
Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, ON, Canada
Abstract :
A novel approach is proposed for split-step time-domain simulation of pulse propagation in optical fiber. In this approach, a Fourier series expansion method is introduced for time-domain digital filter extraction from any given fiber transfer function. With such extracted filter coefficients and a double Tukey window function, the filter length can be optimized for a given error tolerance. This method is validated by comparing our simulation results with that obtained from the well-known split-step frequency-domain method. Through several simulation examples, we find that this solution technique is much more efficient than other existing time-domain approaches-as much as 92% of the computation time can be saved. It even outperforms the well-known split-step frequency-domain fast Fourier transform method in terms of the computation efficiency, under the condition that the input signal samples are huge-a situation we often meet in dealing with wavelength division multiplexing systems. Moreover, we find that the truncation effect at the computation window edge introduced by the time-domain algorithm is less severe than the aliasing effect associated with the frequency-domain method, not to mention that we can eliminate the truncation error by using a sliding window, only at a small cost on computation time.
Keywords :
digital filters; fast Fourier transforms; frequency-domain analysis; light propagation; optical fibres; optical filters; optical transfer function; time-domain analysis; Fourier series expansion method; aliasing effect; double Tukey window function; fiber transfer function; filter coefficients; optical fiber; pulse propagation; split-step frequency-domain fast Fourier transform method; split-step time-domain simulation; time-domain digital filter extraction; truncation effect; truncation error; wavelength division multiplexing systems; Bandwidth; Finite impulse response filter; Frequency domain analysis; Optical fiber filters; Time domain analysis; Digital filter; finite-impulse response; modeling and simulation; optical fiber; pulse propagation; split-step method; time-domain approach;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2010.2070835