[1] Gedeon A.Comparison between rigorous theory and WKB analysis of modes in graded index waveguides. Opt. Commun., 1974,12(3):329~332
[2] Ghatak A K,Thyagarajan K,Shenoy M R.Numerical analysis of planar optical waveguides using matrix approach. J. Lightwave Technol.,1987,5(5):660~667
[3] Taneja A K,Srivastava S,Sharma E K.Closed-form expressions for propagation characteristics of diffused planar optical waveguides.Microwave and Opt.Technol.Lett.,1997,15(5):305~310
[4] Goyal I C,Jindal R,Ghatak A K.Planar optical waveguides with arbitrary index profile: an accurate method of analysis.J.Lightwave Technol.,1997,15(11):2179~2182
[8] Zhan L,Cao Z.Exact dispersion equation of a graded refractive-index optical waveguide based on the equivalent attenuated vector.J.Opt.Soc.Am.(A),1998,15(3):713~716
[9] Cao Z,Hu C,Jin G.Method of equivalent refractive indices in multi-quantum-well waveguides with arbitrary shaped base periods.J.Opt.Soc.Am.(B),1991,8(12):2519~2522