Patent ID: 7772615

Claim:
A semiconductor optoelectronic device comprising: a) an electrooptic modulator further comprising semiconductor electrooptic medium, wherein said semiconductor electrooptic medium further comprises i) at least one heterojunction, ii) a first region of said electrooptic medium, located on a first side from said at least one heterojunction, wherein an electron state defined by an electron wave function in a zero electric field is mainly localized in said first region of said electrooptic medium, and iii) a second region of said electrooptic medium located on a second side from said heterojunction opposite to said first region, wherein a hole state defined by a hole wave function in a zero electric field is mainly localized in said second region, wherein localization of the electron and the hole wave functions in different regions means that the overlap between these wave functions is small, wherein in a non-zero electric field at least one wave function selected from the group consisting of the electron wave function and the hole wave function is squeezed to said heterojunction, wherein said overlap between said electron wave function and said hole wave function increases versus applied electric field, and wherein an oscillator strength of the optical transition between said electron state and said hole state increases versus applied electric field.