20 December 2004 A discriminator-aided optical phase-lock loop constructed from commercial components
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Wireless access systems operating at higher microwave/mm-wave frequencies (10-60 GHz) are attractive because of ample spectrum availability and the potential for large bandwidth allocations. The difficulty with such a system is in the high cost associated with the microwave sources and signal distribution. Optical fibers are an obvious means of alleviating distribution problems, but optical modulation techniques are not currently capable of economically generating mm-wave frequencies. One potentially cost-effective method to fabricate such a system is via optical heterodyning. In such a system, it is relatively simple to generate microwave and mm-wave carriers. However, the difficulties in generating a high-quality signal are two-fold: The first is in maintaining a specific frequency difference (i.e. microwave signal) between the lasers for a prolonged period of time. The second is in narrowing the inherent linewidth of the laser from the MHz values typically produced by conventional semiconductor lasers, down to values more practical for a communication system. The applications in which this microwave signal can be used are determined by the degree to which the linewidth can be reduced. This presentation will discuss the design and implementation of an 11 GHz discriminator-aided, optical phase-lock loop constructed from commercially available external-cavity lasers incorporating fiber Bragg gratings.
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Joseph S. Seregelyi, Joseph S. Seregelyi, J. Claude Belisle, J. Claude Belisle, } "A discriminator-aided optical phase-lock loop constructed from commercial components", Proc. SPIE 5577, Photonics North 2004: Optical Components and Devices, (20 December 2004); doi: 10.1117/12.566896; https://doi.org/10.1117/12.566896

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