Old two level model.
Three level model.
Improved two level model.
Variation of the normalized modulation response in decibels (10 log10|η|) with modulating frequency. Solid line: Ib /Ith = 3.0; dashed line: Ib /Ith = 2.0; dotted line: Ib /Ith = 1.2.
Variation of the 3 dB electrical bandwidth with optical power output obtained from the exact expression, Eq. (19) (the continuous line), the quadratic approximation, Eq. (25) (the dashed line), and the linear expression, Eq. (26) (the dotted line), for η.
Typical parameters for a QCL (Ref. 6).
Poles and zeros of the normalized modulation response for different bias currents and optical power output.
Poles of the normalized modulation responses in Eqs. (25) and (26), for different bias currents and optical power outputs.
Undamped natural frequency and damping ratio for different bias currents and optical power outputs.
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