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Measurement of the gain saturation spectrum in InGaAsP diode lasers

1990; American Institute of Physics; Volume: 57; Issue: 24 Linguagem: Inglês

10.1063/1.103842

1520-8842

R. Frankenberger, R. Schimpe,

Advanced Fiber Laser Technologies

The origin of nonlinear gain suppression in InGaAsP lasers is analyzed by experiments sensitive to small gain changes. The spectral distribution of gain change is determined by measuring the intensity modulation spectra of current modulated Fabry–Perot lasers with nearly single longitudinal mode emission. The gain change spectra show a cross saturation behavior as expected for spectral hole burning with a polarization relaxation time of about 0.07 ps. They do not reveal a dominant contribution of the gain and index grating induced by the cavity standing waves.