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Characteristics of modulated periodic media: 2. Active structures
Author(s) -
Warhola G. T.,
Jaggard D. L.
Publication year - 1981
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs016i004p00475
Subject(s) - oscillation (cell signaling) , modulation (music) , physics , frequency modulation , mode (computer interface) , laser , optics , control theory (sociology) , mathematics , acoustics , computer science , telecommunications , radio frequency , control (management) , artificial intelligence , operating system , genetics , biology
We investigate the oscillation characteristics of active modulated periodic slabs such as those used for distributed feedback (DFB) lasers. In particular, we examine the effect of modulation wave number on the threshold gain and oscillation frequency of these structures by employing the vector coupled‐mode approximation. Significant changes in threshold gain are found for large modulation indices and moderate couplings as compared to the unmodulated case. Small changes in the oscillation frequency are also noted. Methods for lowering threshold gain are suggested.