Patent ID: 6868107
Filing Date: 2005-03-15
Classification: B82Y,H01S

Abstract:
1. A method for calculating the beam quality and output wavelength spectrum of a photonic crystal distributed feedback laser having input parameters comprising a) design parameters that include an operating wavelength and a laser waveguide structure, b) additional design parameters that include a length for an active cavity of said laser configuration divided into incremental cavity lengths and a stripe width for a gain stripe of said laser configuration wherein said stripe width is divided into a plurality of incremental stripe widths, and c) a photonic crystal geometry comprising a lattice symmetry, a grating order, a feature having a shape and a size, and a modulation depth of the modal refractive index corresponding to said laser waveguide structure, said method comprising: calculating at least two coupling coefficients and forming a characteristic matrix; repeating the following steps at spaced increments of time until a steady state solution is reached: whereby said steady-state solution is used as the basis for evaluating the beam quality and output wavelength spectrum corresponding to said design parameters, said additional design parameters, and said photonic crystal geometry of said laser configuration.