Analog frequency modulation of radiation emitted by single-mode heterojunction lasers in the spectral range 1.3μ

The emission spectra of two single-mode heterojunction lasers based on InP–(InGa)AsP structures were determined with a resolution of 50 MHz under conditions of modulation by a small signal superimposed on a constant injection current. The dependences of the frequency modulation coefficient on the frequency of the modulating signal were determined in the range 10²–3×10⁹ Hz. These dependences were influenced considerably by the structure and the mounting of the active element.