A novel method to measure the optical modulation response of laser diodes that uses as the modulation source the output of a femtosecond optical parametric oscillator (OPO) is described. The femtosecond OPO generates a train of ~ 150 fs pulses tunable between 1.03 and 1.35 μm with an average power of 12 mW at a repetition rate of 81 MHz. With such a narrow pulse a rich frequency spectrum of flat intensity distribution that easily surpasses the 2000 GHz 3 dB-bandwidth is obtained. To perform modulation response measurements the OPO is selectively tuned to modulate the carrier population in either the well or separate confinement region of the laser diode. Modulation traces obtained with this method in 1.3 μm InAsP lasers are presented and compared with those obtained from electrical modulation at the same operating conditions.
In this paper we present results of small signal response measurements of 1.3mm strained InAsP buried heterostructure multiple quantum well lasers obtained using optical and electrical excitation. Direct modulation of the carrier population in the quantum wells with a femtosecond pulse from an Optical Parametric Oscillator yields frequency response traces with modulation bandwidths of ~ 6 GHz at biases of 1.5 and 1.8+ threshold. These results contrast with those obtained with electrical excitation for which modulation bandwidths of ~ 3 GHz are obtained at the same DC bias conditions. Analysis of the modulation traces obtained with optical excitation show that in these lasers, transport processes play a dominant role in the frequency response.
In this paper we analyze the frequency response of 1.3+m highly strained InAsP/InGaAsP MQW lasers under small signal conditions. We show that in these lasers, electrical parasitics limit the high frequency response. These parasitics which are inherent to the laser structure, show an inductance-like behavior as determined from impedance measurements. We further show that the effect of the parasitic inductance in the laser modulation response can be significantly reduced by modifying the laser driving circuit.
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