TY - JOUR
T1 - Frequency modulation response due to the intensity modulation of fiber-grating Fabry-Perot lasers
AU - Hisham, H. K.
AU - Mahdiraji, G. A.
AU - Abas, A. F.
AU - Mahdi, M. A.
AU - Mahamd Adikan, F. R.
PY - 2014
Y1 - 2014
N2 - A comprehensive study on the small-signal frequency modulation (FM) characteristics of a fiber-grating Fabry-Perot (FGFP) laser is numerically conducted. Fiber Bragg grating (FBG) is used as a wavelength selective element to control the properties of the laser output by controlling the external optical feedback (OFB) level. In addition to the external OFB level, the effect of other parameters such as temperature, injection current, cavity volume, nonlinear gain compression factor, linewidth enhancement factor, and fiber-grating (FG) parameters on FM characteristics of the laser are investigated. The study is performed by modifying a set of rate equations that are solved by considering the effects of external OFB and ambient temperature (T) variations. The temperature dependence (TD) of FM characteristics is calculated according to TD of laser parameters instead of using well-known Pankove relationship. Results show that the optimum external fiber length (Lext) is 3.1 cm and the optimum range of working temperature for FGFP laser is within ± 2 °C from the FBG reference temperature (To). Also, it is shown that antireflection (AR) coating reflectivity and the linewidth enhancement factor have no significant effect on the FM response. The FM spectra peak amplitude is less than 5 dB with 5 mW output power. Good temperature stability is also obtained.
AB - A comprehensive study on the small-signal frequency modulation (FM) characteristics of a fiber-grating Fabry-Perot (FGFP) laser is numerically conducted. Fiber Bragg grating (FBG) is used as a wavelength selective element to control the properties of the laser output by controlling the external optical feedback (OFB) level. In addition to the external OFB level, the effect of other parameters such as temperature, injection current, cavity volume, nonlinear gain compression factor, linewidth enhancement factor, and fiber-grating (FG) parameters on FM characteristics of the laser are investigated. The study is performed by modifying a set of rate equations that are solved by considering the effects of external OFB and ambient temperature (T) variations. The temperature dependence (TD) of FM characteristics is calculated according to TD of laser parameters instead of using well-known Pankove relationship. Results show that the optimum external fiber length (Lext) is 3.1 cm and the optimum range of working temperature for FGFP laser is within ± 2 °C from the FBG reference temperature (To). Also, it is shown that antireflection (AR) coating reflectivity and the linewidth enhancement factor have no significant effect on the FM response. The FM spectra peak amplitude is less than 5 dB with 5 mW output power. Good temperature stability is also obtained.
KW - external cavity semiconductor lasers
KW - external optical feedback
KW - fiber Bragg grating
KW - frequency modulation
UR - http://www.scopus.com/inward/record.url?scp=84904389407&partnerID=8YFLogxK
U2 - 10.1080/09500340.2014.920536
DO - 10.1080/09500340.2014.920536
M3 - Article
AN - SCOPUS:84904389407
SN - 0950-0340
VL - 61
SP - 1081
EP - 1091
JO - Journal of Modern Optics
JF - Journal of Modern Optics
IS - 13
ER -