The authors present a new concept of modulation for a 1.55 mu m DFB MQ
W laser diode allowing generation of millimetre waves. The method cons
ists in modulating the saturable absorber of a two-section laser. The
improvements brought by the new concept are evaluated theoretically an
d have been verified experimentally for the first time. In particular,
a 30 GHz cutoff frequency has been measured.