M. Silver et al., POLARIZATION-INSENSITIVE MODULATORS BASED ON MULTISTRAIN STEPPED QUANTUM-WELL STRUCTURES, Electronics Letters, 30(22), 1994, pp. 1890-1891
Quantum-confined Stark-effect modulators, in which each quantum well c
ontains two or more layers with different tensile strains, can maintai
n excellent polarisation independence over a wide range of electric fi
elds. Matching of the energies of the El-HHl and El-LHl transitions wi
th applied field can be an order of magnitude closer than for simple,
single composition, tensile wells.