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Frequency stabilization of semiconductor lasers for applications in coherent communication systems

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3 Author(s)
Sollberger, A. ; Swiss Federal Institute of Technology, Institute of Quantum Electronics, Zürich, Switzerland ; Heinamaki, A. ; Melchior, H.

The stabilization of the mean frequency of a single-mode semiconductor laser used under modulation in a FSK heterodyne transmission system is achieved by a novel method. The frequency stabilization scheme locks the laser to one of the resonance frequencies of a Fabry-Perot interferometer (FPI). The laser is weakly modulated at a frequency higher than any signal frequencies. Light reflected from the FPI is detected and synchronously demodulated for feedback and current control of the laser. A laser modulated by a pseudorandom sequence with a rate of 140 Mbit/s and an optical frequency deviation of 280 MHz is stabilized with this method against variations in operating temperature and bias current. The mean optical frequency is maintained within ± 10 MHz for hours. Analysis and experiments confirm that the laser frequency remains stable even when the laser linewidth changes under weak optical feedback.

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Lightwave Technology, Journal of  (Volume:5 ,  Issue: 4 )