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Planar-waveguide external cavity laser stabilization for an optical link with 10-19 frequency stability

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7 Author(s)

We stabilized the frequency of a compact planar-waveguide external cavity laser (ECL) on a Fabry-Perot cavity (FPC) through a Pound-Drever-Hall scheme. The residual frequency stability of the ECL is 10-14, comparable to the stability achievable with a fiber laser (FL) locked to an FPC through the same scheme. We set up an optical link of 100 km, based on fiber spools, that reaches 10-19 relative stability, and we show that its performances using the ECL or FL are comparable. Thus ECLs could serve as an excellent replacement for FLs in optical links where cost-effectiveness and robustness are important considerations.

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:58 ,  Issue: 12 )