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Phase stability of photoreceivers in intersatellite laser interferometers.
Optics Express 2017 April 4
A photoreceiver (PR) is required for the opto-electrical conversion of signals in intersatellite laser interferometers. Noise sources that originate or couple in the PR reduce the system carrier-to-noise-density, which is often represented by its phase noise density. In this work, we analyze the common noise sources in a PR used for space-based interferometry. Additionally, we present the results from the characterization of the PRs in GRACE-FO, a mission which will pioneer intersatellite laser interferometry. The estimated phase noise is shot-noise limited at 10<sup>-4</sup> rad/Hz<sup>1/2</sup> down to 10<sup>-2</sup> Hz, almost 4 orders of magnitude below the instrument top level requirement (0.5 rad/Hz<sup>1/2</sup>). Below 10<sup>-2</sup> Hz, the PR finite phase response noise dominates but the levels still comply with the instrument requirement. The sub-mHz noise levels and the PR electronic noise have been identified as key design factors for the LISA PR.
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