  We consider the properties of the small-signal modulation response of
symmetry-breaking phase-locked states of twin coupled semiconductor lasers. The
extended stability and the varying asymmetry of these modes allows for the
introduction of a rich set of interesting modulation response features, such as
sharp resonances and anti-resonance as well as efficient modulation at very
high frequencies exceeding the free running relaxation frequencies by orders of
magnitude.

Optics