Abstract
The lasing mode behavior of a multiple quantum well (MQW) distributed feedback (DFB) laser was measured when intensity-modulated orthogonally polarized transverse magnetic (TM) mode light was injected. The 3-dB bandwidth of the frequency response shows a trend different from that observed with conventional bias current modulation: at high bias currents, it decreases with increasing bias current. The maximum bandwidth of 3 dB was observed when the normalized bias current was 4, and it reached 16 GHz at this bias current. The gain saturation coefficients for the transverse electric (TE) and TM modes estimated from these results were in /sub p//sup E/; 2.5*10/sup -17/ cm/sup 3/ and in /sub q//sup E/ 5.7*10/sup -18/ cm/sup 3/ for the TE mode, and in /sub p//sup M/: 6.0*10/sup -17/ cm/sup 3/ and in /sub q//sup M/: 2.0*10/sup -14/ cm/sup 3/ for the TM mode.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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