Driver circuit of a tunable laser diode

摘要

A driver circuit of a laser diode (101). The laser diode has a first electrode structure (101a, 101c) for injecting a first drive current (Is) with a first magnitude and a second electrode structure (101b) separated from the first electrode structure for injecting a second drive current (Ic) with a second magnitude. The second electrode structure is provided in correspondence to where carriers are depleted most. The driver circuit comprises a presetting circuit (103) for presetting a relationship between the first and second magnitudes, and a current distribution circuit (30, 102, 102 min ) controlled by the presetting circuit for producing the first and second drive currents with respective magnitudes determined to satisfy the relationship that is preset by the presetting means.