Title :
Distributed feedback coupling coefficient in diode lasers with metallized gratings
Author :
Luo, H.J. ; Zory, P.S.
Author_Institution :
Dept. of Electr. Eng., Florida Univ., Gainesville, FL, USA
Abstract :
First-order distributed-feedback (DFB) evanescent coupling effects are investigated in heterojunction diode laser structures with integrated, metallized diffraction gratings. A closed-form expression for the DFB coupling coefficient kappa is derived using a ray optics technique. The expression can be evaluated easily since it depends only on the laser wavelength, the grating depth, and the parameters of the metallized planar waveguide. The validity of the expression is established by using a truncated Floquet-Bloch approach to compute kappa .<>
Keywords :
diffraction gratings; distributed feedback lasers; geometrical optics; metallisation; semiconductor junction lasers; DFB coupling coefficient; diffraction gratings; diode lasers; evanescent coupling effects; grating depth; heterojunction diode laser structures; laser wavelength; metallized gratings; metallized planar waveguide; ray optics technique; truncated Floquet-Bloch approach; Closed-form solution; Diffraction gratings; Diode lasers; Distributed feedback devices; Heterojunctions; Metallization; Optical coupling; Optical diffraction; Optical feedback; Optical surface waves;
Journal_Title :
Photonics Technology Letters, IEEE
