STATIC AND DYNAMIC ANALYSIS OF TUNABLE 2-SECTION HIGH-SPEED DISTRIBUTED-FEEDBACK LASER UTILIZING THE GAIN LEVER EFFECT

Analysis of a novel semiconductor laser structure designed for obtaini ng wide tuning range along with high speed modulation response is pres ented, The laser consists of a composite cavity structure with two act ive (gain) sections. One of the sections has a grating corrugation whi le the other is flat. A detailed round-trip analysis is combined with the rate equations, which include sublinear gain/carrier relation, to perform steady-state and small-signal analysis, It is shown that the b iasing (de) condition of the different sections plays a critical role in the determination of the dynamic response of the device, In additio n, we show that the gain-lever effect can be utilized for a considerab le enhancement of the frequency modulation (FM) response. Other critic al structural parameters such as the grating coupling coefficient and device geometry are discussed.