Frequency modulation responses of twohyphen;electrode distributed feedback lasers

摘要

Frequency modulation (FM) response of a 1.3 mgr;m twohyphen;electrode distributed feedback laser is studied in detail. We found that by adjusting the injection current applied to the modulated section, the FM bandwidth can be increased to a value as high as 900 MHz. However, as the bandwidth increases, the FM sensitivity decreases proportionally. This behavior is described satisfactorily by belowhyphen;threshold carrier rate equation and shown to be closely related to the injected carrier lifetime.