Slide 1

Modeling and Simulation of Broad-Area Semiconductor Lasers using FFT-BPM : : : FY96 B200-96ED4 Slide 2 Modeling and Simulation of Broad-Area Semiconductor Lasers using FFT-BPM 2.Naoyuki Morimoto,* Tomoaki Toda, and Tadashi Takano, Radiation Characteristics Analysis of Broad Area Laser Diodes and the Proposal of Improvement Methods, Electronics and Communications in Japan, Vol. 85, No. 3, pp 40-49, 2002. 3.John R. Marciante and Govind P. Agrawal, Nonlinear Mechanisms of Filamentation in Broad- Area Semiconductor Lasers, IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL 32, NO 4, pp. 590-596, APRIL 1996. 1.Introduction to optical waveguide analysis, Authors: Kenji Kawano and Tsutomu Kitoh References: 1.Pump intensity, pump stripe shape 2.Cavity length, width, mirror reflectivity, cavity internal loss. 3.Kerr effect coefficient, confinement factor, linewidth enhancement factor Modeling Variables: Slide 3 Simulation of Semiconductor Laser using FFT-BPM Naoyuki Morimoto,* Tomoaki Toda, and Tadashi Takano, Radiation Characteristics Analysis of Broad Area Laser Diodes and the Proposal of Improvement Methods, Electronics and Communications in Japan, Vol. 85, No. 3, pp 40-49, 2002. John R. Marciante and Govind P. Agrawal, Nonlinear Mechanisms of Filamentation in Broad-Area Semiconductor Lasers, IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL 32, NO 4, pp. 590-596, APRIL 1996. 1. 2. 1. 2. Considerrations of the gain g, internal cavity loss int, Kerr effect n 2, confinement factor , and linewidth enhancement factor are all included in n(x,z) Slide 4 Derivation of n Assume the wave propagating toward After pumping Gain and loss Slide 5 Correction of Equations Naoyuki Morimoto,* Tomoaki Toda, and Tadashi Takano, Radiation Characteristics Analysis of Broad Area Laser Diodes and the Proposal of Improvement Methods, Electronics and Communications in Japan, Vol. 85, No. 3, pp 40-49, 2002. John R. Marciante and Govind P. Agrawal, Nonlinear Mechanisms of Filamentation in Broad-Area Semiconductor Lasers, IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL 32, NO 4, pp. 590-596, APRIL 1996. 1. 2. 1. 2. Slide 6 Theory of FFT-BPM Reference: 1.Introduction to optical waveguide analysis,Authors: Kenji Kawano and Tsutomu Kitoh c If refractive index is uniform, n=0, thus it can be simplified as Ex. Far-Field Profile (FFP) Near-Field Profile (NFP) in free space Slide 7 x z Slide 8 Matlab Programs 1.Fast-Fourier-Transform Beam-Propagation Method (FFT-BPM) Matlab program: FFTBPM_MMI.m Slide 9 2. Matlab program: FFTBPM_Laser.m PumpStripeWidth=10 m The first 10 roundtrip The 200th roundtrip Slide 10 The first 10 roundtrip The 300th roundtrip 2. Matlab program: FFTBPM_Laser.m PumpStripeWidth=100 m Slide 11 3. Matlab program: BPM_FarFieldProfile.m For the case of PumpStripeWidth=10 m Slide 12 3. Matlab program: BPM_FarFieldProfile.m, 4. Matlab program: BPM_NearFieldProfile.m, For the case of PumpStripeWidth=100 m Slide 13 5. Matlab program: FFTBPM_Laser_c.m, For the case of PumpStripeWidth=100 m with phase correction at the output end of the laser