SPECTRAL SHIFT AND BROADENING OF DFB LASERS UNDER DIRECT MODULATION

Authors
ZADOK A SHALOM H TUR M CORNWELL WD ANDONOVIC I
Citation
A. Zadok et al., SPECTRAL SHIFT AND BROADENING OF DFB LASERS UNDER DIRECT MODULATION, IEEE photonics technology letters, 10(12), 1998, pp. 1709-1711
Citations number
22
Categorie Soggetti
Optics,"Physics, Applied
Journal title
IEEE photonics technology letters → ACNP
ISSN journal
10411135
Volume
10
Issue
12
Year of publication
1998
Pages
1709 - 1711
Database
ISI
SICI code
1041-1135(1998)10:12<1709:SSABOD>2.0.ZU;2-P
Abstract
The spectrum of DFB lasers, directly modulated at 144 and 622 Mb/s, is found to be considerably wider than the modulating random sequence ra te. The broadening, which may be as high as ten times the data bandwid th, is accounted for by frequency changes (chirp) along each bit, inco rporating a recently observed short time constant on the order of 10-2 0 ns, These changes will also introduce a few gigahertz spectral shift s as a function of the bit rate.