Modulation Characteristics of Tunable DFB/DBR Lasers with One or Two Passive Tuning Sections
نویسندگان
چکیده
Calculation of the small-signal modulation characteristics of tunable DFB and DBR lasers requires rate equations for the photon number, the phase of the electric field, and the carrier densities. In this paper, we derive the rate equation for the photon number and phase from an optical transmission line model and present examples of the frequency and intensity modulation characteristics of a phasetunable DFB laser. The modulation responses exhibit the well-known relaxation resonance if either of the drive currents is modulated, but we also demonstrate the possibility of complete removal of the resonance peak together with a perfect cancellation of spurious intensity modulation. The frequency modulation response then assumes a simple low-pass character with a cutoff frequency determined by the carrier lifetime in the passive tuning section. The importance of choosing the proper bias conditions is emphasized.
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