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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1994),
  • paper QThB6

Spontaneous emission, nonlinear optical coupling, and noise in laser diodes

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Abstract

External optical injection1 and noise2 in semiconductor laser diodes can both be modeled by using the coupled-complex-oscillating-field and carrier-density approach. The noise spectra generated by spontaneous emission into the oscillating mode will have the same shape as the combined regenerative-amplification and four-wave mixing spectra induced by optical injection. Using our previous results on the phase and amplitude properties of the modulation induced by optical injection,1 we observe a significant deviation of the noise spectra from the combined spectra. Figure 1 shows data and modeling of the optical noise spectra of a nearly-single-mode quantum-well laser diode. Figure 2 shows the noise power spectra. Data are shown for both the overall optical output and the optical output of only the principal mode. The deviations of the data from the spectra expected from spontaneous emission can be modeled by adding a colored-noise-source term to the carrier-density equation.

© 1994 Optical Society of America

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