This effect's most successful application has been in DFB lasers, where it may allow a negative chirp factor. This effect breaks inversion symmetry, so parity selection rules no longer apply and interband 3 transitions with odd ∆n are allowed. This effect underlies self-electro-optic effect devices, or SEEDs. Both the Franz-Keldysh effect and this effect must be considered for electro-absorption modulators based on large structures. This effect reduces the energy of bound states in a quantum well under the 6 influence of an applied electric field, which modulates the effective bandgap, and forces a particularly large decrease in the exciton binding energy. For 10 points, name this effect in which an electric field applied in the growth direction of a quantum well produces a (*) shift in energy level and which is9 
This effect's most successful application has been in DFB lasers, where it may allow a negative chirp factor. This effect breaks inversion symmetry, so parity selection rules no longer apply and interband 3 transitions with odd ∆n are allowed. This effect underlies self-electro-optic effect devices, or SEEDs. Both the Franz-Keldysh effect and this effect must be considered for electro-absorption modulators based on large structures. This effect reduces the energy of bound states in a quantum well under the 6 influence of an applied electric field, which modulates the effective bandgap, and forces a particularly large decrease in the exciton binding energy. For 10 points, name this effect in which an electric field applied in the growth direction of a quantum well produces a (*) shift in energy level and which is9 named for a classical analog.
This effect's most successful application has been in DFB lasers, where it may allow a negative chirp factor.
QCSE [or: quantum-confined Stark effect]