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IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 33, NO. 10, OCTOBER 1997 1801 Investigations of the Spectral Characteristics
 

Summary: IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 33, NO. 10, OCTOBER 1997 1801
Investigations of the Spectral Characteristics
of 980-nm InGaAs­GaAs­AlGaAs Lasers
Ivan A. Avrutsky, Reuven Gordon, R. Clayton, and Jimmy M. Xu, Senior Member, IEEE
Abstract--Semiconductor quantum-well (QW) lasers at 980 nm
exhibit unique spontaneous emission spectra with a periodic enve-
lope of approximately 23-nm wavelength. This phenomenon has
been observed in both front facet and side spontaneous emission.
The modulation is modeled in terms of coupling between the
laser waveguide and the substrate waveguide which is transparent
to 980-nm light. Modal gain spectra of the entire waveguide
structure including substrate are calculated numerically by a
transfer matrix method. The gain spectra in the active stripe
and loss spectra in the unpumped QW exhibit modulation. This
results in modulation of the emission spectra. An analytical
approach based on coupled mode equations is developed to
explain and clarify the results of the numerical modeling. The
interesting case of a coupling length that is small by comparison
with the gain/loss length is examined in detail. Front facet and
side spontaneous emission spectra calculated using the modal gain

  

Source: Avrutsky, Ivan - Department of Electrical and Computer Engineering, Wayne State University

 

Collections: Engineering