Adaptive Control for Laser Transmitter Feedforward Linearization System

• Published in: IEEE photonics journal Vol. 6; no. 4; pp. 1 - 10
• Main Authors: Neo, Y. S., Idrus, S. M., Rahmat, M. F., Alavi, S. E., Amiri, I. S.
• Format: Journal Article
• Language: English
• Published: Piscataway IEEE 01-08-2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive control; Adaptive control systems; Algorithms; Control systems; Control theory; Diode lasers; Equations; Feedforward; Feedforward neural networks; Lasers; Linear programming; Mathematical model; Mathematical models; Semiconductor lasers; Transmitters; laser transmitter; Adaptive control system; Newton trust-region dogleg; numerical optimization; feedforward linearization
• ISSN: 1943-0655; 1943-0647
• DOI: 10.1109/JPHOT.2014.2335711

In this paper, an adaptive control system is employed in a novel implementation technique of the feed forward linearization system for optical analog communication systems' laser transmitter. The adaptive control system applies the Newton trust-region dogleg algorithm, which is a numerical optimization algorithm, to automatically tune the adjustment parameters in the feedforward loops to optimize the feed forward system performance and adapt to process variations. At the end of this paper, significant reductions of over 20 dBm in the third-order inter modulation distortion products have been achieved for operating frequencies from 5.0 to 5.8 GHz.