Document Type : Research Paper
Author
Electrical Engineering Department, Faculty of Engineering, Basra University,
Abstract
In this paper, a new methodology for controlling the Q-point in the distributed feedback (DFB) lasers is proposed. The method based on reducing the DFB transient period (TP) by optimizing laser’s model parameters numerically. The analysis has taken into account investigated the effects of the laser injection current (Iinj), the dc-bias level (Ibias), the temperature (T) variation, and the gain compression factor (ε). Results showed that by optimizing the value of Iinj, Ibias, T and ε; the Q-point could be controlled effectively. Where increasing the current ratio (i.e., Iinj/Ith) leads to reduce the TP value. In addition, by increasing Iinj and/or Ibias, the relaxation oscillation period (TRO) and the laser delay time (TDelay) are reduced significantly. From the other hand, the temperature varying may push the DFB laser to operate in an improper region through increasing the TP value; which may lead it to operate in the off-mode. Moreover, as ε is increased, the sinusoidal oscillations are dramatically damped results in a reduction in the TRO value and larger period of stabilized.
Keywords
- Critical system
- Distributed feedback (DFB) lasers
- dynamic characteristics
- Equilibrium (Q-point) point
- semiconductor diode lasers (SDLs) transient response
Main Subjects
Fiber Grating Using Genetic Algorithms,” Al-Nahrian J.
Engineering Science (NJES), vol. 21, pp. 45-50, 2018.
[2] H.K. Hisham, “Effect of Temperature Variations on
Strain Response of Polymer Bragg Grating Optical Fibers,”
Iraq J. Electrical and Electronic Engineering, vol. 1, pp.53-
58, 2017.
[3] Y. Wu, T. Ye, L. Zhang, X. Hu, X. Li, Y. Su, “Acosteffective WDM-PON architecture simultaneously
supporting wired, wireless and optical VPN services,”
Opt. Commun., vol. 284, pp. 1139–1145, 2011.
[4] H.K. Hisham, G.A. Mahdiraji, A.F. Abas, M.A. Mahdi,
F.R. Mahamd Adikan, “Frequency Modulation Response
due to the Intensity Modulation of a Fiber Grating FabryPerot Lasers,” Journal of Modern Optics, vol. 61, pp. 393-
401, 2014.
[5] I. Fatadin, D. Ives and M. Wicks, “Numerical simulation
of intensity and phase noise from extracted for CW DFB
lasers,” IEEE J. Quantum Electron., vol. 42, pp. 934-941,
2006.
[6] J. Tang, and J. Sun, “Stable and widely tunable
wavelength-spacing single longitudinal mode dualwavelength erbium-doped fiber laser,” Opt. Fiber Technol.,
vol. 16, pp. 299–303, 2010.
[7]H.K. Hisham, G.A. Mahdiraji, A.F. Abas, M.A. Mahdi,
F.R. Mahamd Adikan “Characterization of Turn-On Time
Delay in a Fiber Grating Fabry-Perot Lasers,” IEEE
Photonics Journal, vol. 4, pp 1662-1678, 2012.
[8] M.M.K. Liu, “Principle and Applications of Optical
Communication,” New York: McGraw-Hill, 1996.
[9]G.P. Agrawal and N.K. Dutta, “Semiconductor Lasers,”
New York: Van Nostrand Reinhold, 1993.
)
