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arxiv 1905.07552 v1 pith:PNUR4UG4 submitted 2019-05-18 physics.optics

Phase noise accumulation in recirculating frequency shifting loop based programmable optical frequency comb

classification physics.optics
keywords frequencylinewidthloopshiftingaccumulationedfanoisephase
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The phenomenon of linewidth continuously broadening along with the recirculation number in recirculating frequency shifting loop is observed. In this paper, a novel method of measuring the phase noise accumulation induced by EDFA in recirculating frequency shifting loop is proposed and the experiment results support the viewpoint of the laser linewidth will be broadening by EDFA. An empirical formula has been extracted to estimate the linewidth deterioration of the RFS output. We demonstrate the relationship between the linewidth and the recirculation number of the RFS based optical frequency comb in both theoretically and experimentally. By employing the recirculation frequency shifting loop, the phase noise accumulation induced by EDFA could be measured obviously and the linewidth of each tone can be measured precisely.

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