Spectral shift and broadening of DFB lasers under direct modulation

Avi Zadok*, Hamutal Shalom, Moshe Tur, W. D. Cornwell, Ivan Andonovic

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


The spectrum of DFB lasers, directly modulated at 144 and 622 Mb/s, is found to be considerably wider than the modulating random sequence rate. The broadening, which may be as high as ten times the data bandwidth, is accounted for by frequency changes (chirp) along each bit, incorporating a recently observed short time constant on the order of 10-20 ns. These changes will also introduce a few gigahertz spectral shifts as a function of the bit rate.

Original languageEnglish
Pages (from-to)1709-1711
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number12
StatePublished - Dec 1998


  • Distributed-feedback lasers
  • Optical communication
  • Optical modulation/demodulation


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