Microcontroller based feedforward digital controller for laser frequency locking for wide band WDM communication systems | ||||
| The International Conference on Electrical Engineering | ||||
| Article 121, Volume 6, 6th International Conference on Electrical Engineering ICEENG 2008, May 2008, Page 1-11 PDF (163.81 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/iceeng.2008.34395 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Samy Ghoniemy | ||||
| Egyptian Armed Forces. | ||||
| Abstract | ||||
| Abstract: In this paper, feed forward controller model based on the laser’s inverse model is proposed. An enhanced digital control algorithm for 3rd, 5th, and 7th and possibly higher harmonics for laser frequency locking is developed. A generic diagram for the digital implementation of the proposed controller is presented. Digital implementation of the control algorithm modules is proposed and discussed. Hardware realization based on microcontrollers for the proposed digital controller is introduced and described for He-Ne laser systems. Simulation results of the full system showed that using higher harmonics in laser frequency locking yields better performance in regard to the frequency shifts, improved noise performance, and hence better reproducibility. It also showed that the frequency difference between lasers locked with higher order harmonic locking using the digital realization is better than that locked with lower order harmonic locking. The measurement results using the lab version of the realized controller and He-Ne laser system is presented and found in a very good agreement with the simulation results which assure that the proposed digital controller can be accurately used for transmitting multiple users’ data over WDM communication systems with acceptable stability. | ||||
| Keywords | ||||
| Frequency stabilization; frequency-locking; feedforward digital controller | ||||
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