Title :
Theory of polarization-dependent amplification in a slab waveguide with anisotropic gain and losses
Author :
Visser, T.D. ; Blok, H. ; Lenstra, D.
Author_Institution :
Dept. of Phys. & Astron., Free Univ., Amsterdam, Netherlands
fDate :
2/1/1999 12:00:00 AM
Abstract :
We analyze the waveguiding properties of a semiconductor slab waveguide amplifier in which the gain (i.e., the permittivity) in the quantum well (QW) is taken to be anisotropic. Losses may be present simultaneously in the cladding layers. Using scattering theory, a rigorous integral equation is derived. Our model incorporates the two main causes of polarization sensitivity of the amplification, viz. 1) waveguiding and 2) the anisotropic light-matter interaction in the QW. It is determined how much anisotropy is needed in the QW to get a polarization-insensitive amplification. Also, reflection coefficients and TE/TM mixing are studied. A comparison between the exact results and the Born approximation is made. A Green´s tensor for a layered structure with losses is derived
Keywords :
approximation theory; laser theory; light polarisation; optical losses; optical waveguide theory; quantum well lasers; semiconductor device models; semiconductor optical amplifiers; tensors; waveguide lasers; Born approximation; Green´s tensor; TE/TM mixing; anisotropic gain; anisotropic light-matter interaction; anisotropic losses; exact results; layered structure; permittivity; polarization sensitivity; polarization-dependent amplification; polarization-insensitive amplification; quantum well; reflection coefficients; rigorous integral equation; scattering theory; semiconductor slab waveguide amplifier; slab waveguide; waveguiding properties; Anisotropic magnetoresistance; Integral equations; Light scattering; Optical polarization; Particle scattering; Permittivity; Semiconductor optical amplifiers; Semiconductor waveguides; Slabs; Waveguide theory;
Journal_Title :
Quantum Electronics, IEEE Journal of
