TY - JOUR
T1 - Spectral shift and broadening of DFB lasers under direct modulation
AU - Zadok, Avi
AU - Shalom, Hamutal
AU - Tur, Moshe
AU - Cornwell, W. D.
AU - Andonovic, Ivan
PY - 1998/12
Y1 - 1998/12
N2 - 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.
AB - 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.
KW - Distributed-feedback lasers
KW - Optical communication
KW - Optical modulation/demodulation
UR - http://www.scopus.com/inward/record.url?scp=0032289085&partnerID=8YFLogxK
U2 - 10.1109/68.730477
DO - 10.1109/68.730477
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:0032289085
VL - 10
SP - 1709
EP - 1711
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
SN - 1041-1135
IS - 12
ER -