A THEORETICAL-ANALYSIS OF QUANTUM-NOISE IN SEMICONDUCTOR-LASERS OPERATING WITH SELF-SUSTAINED PULSATION

The semiconductor lasers operating with self-sustained pulsation are u nder developing to be lasers which are less disturbed by the optical f eedback from a surface of optical disk. Structures setting saturable a bsorbing regions utilizing the multi-layer configuration become popula rly used for giving stronger pulsation. However, the quantum (intensit y) noise in these lasers tends to be enhanced. The ridge stripe struct ure, of which almost self-sustained pulsation lasers consist, seems to give a leak current flowing along plane of the cladding region. Such leak current also increases the quantum noise. In this paper. theoreti cal calculations of operating characteristics, such as the self-sustai ned pulsation. the optical output, the quantum noise as well as the tr ansverse filed profile, are theoretically analyzed by including the ab ove mentioned several phenomena.