Direct frequency modulation of vapor phase transported, distributed feedback semiconductor lasers

R. S. Vodhanel, N. K. Cheung, Thomas L Koch

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The frequency modulation (FM) due to injection current modulation of vapor phase transported distributed feedback (VPT DFB) semiconductor lasers is measured as a function of modulation frequency from 10 kHz to 1 GHz. A large frequency modulation response of 350 MHz/mA is obtained for the modulation frequency range of 10 to 1000 MHz. Demodulation of optical frequency shift keying (FSK) at 560 Mb/s is demonstrated, indicating that frequency modulation due to thermal modulation does not pose a significant limitation at this bit rate or higher. The large FM response together with modulation bandwidths up to 8 GHz makes the VPT DFB laser an attractive source for high bit rate optical FSK transmission.

Original languageEnglish (US)
Pages (from-to)966-968
Number of pages3
JournalApplied Physics Letters
Issue number15
Publication statusPublished - 1986
Externally publishedYes


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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