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Conference on Lasers and Electro-Optics

Multi-arm Ultra-Low Noise Er:fiber Frequency Comb Comparison

Michele Giunta, W. Hänsel, M. L. Fischer, M. Lezius, Ronald Holzwarth

Published Jan 1, 2017• 1 citation
Publisher

Abstract

We have performed a multi-arm Er:fiber-based frequency comb comparison. The optical beat frequencies are simultaneously realized over 90 THz (from 192 to 282 THz) showing an integrated phase noise below 55 mrad (1 Hz-1 MHz) and an overlapping ADEV of 5×10−17 at 1 s, averaging below 1×10−18 at 100 s (PI-mode).
DOI
10.1364/cleo_si.2017.sw1j.4

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Optical clocks and their associated frequency comparison networks are exceptionally sensitive to microscopic physical variations and thus capable of measuring fundamental physical quantities across diverse applications. In frequency comparison networks, the optical frequency combs (OFCs) act as accurate frequency sensors designed to translate terahertz optical signals down to radio frequency signals for accurate frequency counting. The number of OFC's comb modes that beat with clock and transfer lasers during remote frequency comparison is indispensable for the calculation of their frequency difference. In this work, with the assistance of a 1542 nm cavity-stabilized laser at Changping campus, the number of comb modes is locally determined with sufficient uncertainty by stepping the comb's repetition rate. This approach bypasses the technical challenges of simultaneous operation of optical clocks, OFC and fiber-link noise cancelation during long-distance comparison, providing a reliable prerequisite for remote optical clock comparisons.