We propose a numerical method to compute the modal fields of optical waveguides. Instead of traditional variational analysis, the calculation of the mode parameters is obtained by a heuristic algorithm of optimization. This approach is very simple in computer programming. And simulation results about ridge-type Ti:LiNbO 3 waveguides are presented in this paper.

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We compute the modal fields of the ridge-type Ti:LiNbO 3 waveguides with trapezoidal cross sections by a variational analysis. All the mode parameters are calculated by our proposed SOS (shift or shrink) method. And the variations of the mode parameters versus the steepness of the lateral sides of the ridges are simulated and presented in this paper.

The implementation of a low-loss demultiplexer with a KRS-5 grism structure for a dense wavelength division demultiplexing (DWDDM) system in fiber communication is carried out. The system has 16 channels with wavelength spacing of 0.8 nm in the C-band wavelength region. This device is successfully fabricated by a precise plungecut diamond-turning technology. Numerical calculations and measurements indicate that this DWDDM is polarization independent and has higher optical efficiency and signal to noise ratio (SNR).