Extended Data Fig. 1: Diagram of the counter-pumped SBL gyroscope. | Nature

Extended Data Fig. 1: Diagram of the counter-pumped SBL gyroscope.

From: Observation of the exceptional-point-enhanced Sagnac effect

Extended Data Fig. 1

See Methods for operational description. PDH, Pound–Drever–Hall lock; ECDL, external-cavity diode laser; EDFA, erbium-doped fibre amplifier; PM, phase modulator; PD, photodetector; ESA, electrical spectrum analyser; FC, frequency counter; PI, proportional-integral servo; RF: radio frequency; f1 (f2): modulation frequency of AOM1 (AOM2); fPDH, phase-modulation frequency of the PDH loop.

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