Thermorefractive noise reduction of photonic molecule frequency combs using an all-optical servo loop

J. Connor Skehan; Anamika Nair Karunakaran; Poul Varming; Óskar B. Helgason; Patrick B. Montague; Jochen Schröder; Minhao Pu; Kresten Yvind; Victor Torres-Company; Peter A. Andrekson

doi:10.1364/OE.496895

Thermorefractive noise reduction of photonic molecule frequency combs using an all-optical servo loop

J. Connor Skehan, Anamika Nair Karunakaran, Poul Varming, Óskar B. Helgason, Patrick B. Montague, Jochen Schröder, Minhao Pu, Kresten Yvind, Victor Torres-Company, Peter A. Andrekson^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

Phase and frequency noise originating from thermal fluctuations is commonly a limiting factor in integrated photonic cavities. To reduce this noise, one may drive a secondary “servo/cooling” laser into the blue side of a cavity resonance. Temperature fluctuations which shift the resonance will then change the amount of servo/cooling laser power absorbed by the device as the laser moves relatively out of or into the resonance, and thereby effectively compensate for the fluctuation. In this paper, we use a low noise laser to demonstrate this principle for the first time in a frequency comb generated from a normal dispersion photonic molecule micro-resonator. Significantly, this configuration can be used with the servo/cooling laser power above the usual nonlinearity threshold since resonances with normal dispersion are available. We report a 50 % reduction in frequency noise of the comb lines in the frequency range of 10 kHz to 1 MHz and investigate the effect of the secondary servo/cooling noise on the comb.

Original language	English
Journal	Optics Express
Volume	31
Issue number	21
Pages (from-to)	35208-35217
ISSN	1094-4087
DOIs	https://doi.org/10.1364/OE.496895
Publication status	Published - 9 Oct 2023

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Funding Information:
Funding. Knut och Alice Wallenbergs Stiftelse Vetenskapsrådet (VR-2015-00535, VR-2020-00453); European Research Council (GA-771410); Marie Sklodowska-Curie Grant Agreement (861152).

Publisher Copyright:
© 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

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title = "Thermorefractive noise reduction of photonic molecule frequency combs using an all-optical servo loop",

abstract = "Phase and frequency noise originating from thermal fluctuations is commonly a limiting factor in integrated photonic cavities. To reduce this noise, one may drive a secondary “servo/cooling” laser into the blue side of a cavity resonance. Temperature fluctuations which shift the resonance will then change the amount of servo/cooling laser power absorbed by the device as the laser moves relatively out of or into the resonance, and thereby effectively compensate for the fluctuation. In this paper, we use a low noise laser to demonstrate this principle for the first time in a frequency comb generated from a normal dispersion photonic molecule micro-resonator. Significantly, this configuration can be used with the servo/cooling laser power above the usual nonlinearity threshold since resonances with normal dispersion are available. We report a 50 % reduction in frequency noise of the comb lines in the frequency range of 10 kHz to 1 MHz and investigate the effect of the secondary servo/cooling noise on the comb.",

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AU - Skehan, J. Connor

AU - Karunakaran, Anamika Nair

AU - Varming, Poul

AU - Helgason, Óskar B.

AU - Montague, Patrick B.

AU - Schröder, Jochen

AU - Pu, Minhao

AU - Yvind, Kresten

AU - Torres-Company, Victor

AU - Andrekson, Peter A.

N1 - Funding Information: Funding. Knut och Alice Wallenbergs Stiftelse Vetenskapsrådet (VR-2015-00535, VR-2020-00453); European Research Council (GA-771410); Marie Sklodowska-Curie Grant Agreement (861152). Publisher Copyright: © 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

PY - 2023/10/9

Y1 - 2023/10/9

N2 - Phase and frequency noise originating from thermal fluctuations is commonly a limiting factor in integrated photonic cavities. To reduce this noise, one may drive a secondary “servo/cooling” laser into the blue side of a cavity resonance. Temperature fluctuations which shift the resonance will then change the amount of servo/cooling laser power absorbed by the device as the laser moves relatively out of or into the resonance, and thereby effectively compensate for the fluctuation. In this paper, we use a low noise laser to demonstrate this principle for the first time in a frequency comb generated from a normal dispersion photonic molecule micro-resonator. Significantly, this configuration can be used with the servo/cooling laser power above the usual nonlinearity threshold since resonances with normal dispersion are available. We report a 50 % reduction in frequency noise of the comb lines in the frequency range of 10 kHz to 1 MHz and investigate the effect of the secondary servo/cooling noise on the comb.

AB - Phase and frequency noise originating from thermal fluctuations is commonly a limiting factor in integrated photonic cavities. To reduce this noise, one may drive a secondary “servo/cooling” laser into the blue side of a cavity resonance. Temperature fluctuations which shift the resonance will then change the amount of servo/cooling laser power absorbed by the device as the laser moves relatively out of or into the resonance, and thereby effectively compensate for the fluctuation. In this paper, we use a low noise laser to demonstrate this principle for the first time in a frequency comb generated from a normal dispersion photonic molecule micro-resonator. Significantly, this configuration can be used with the servo/cooling laser power above the usual nonlinearity threshold since resonances with normal dispersion are available. We report a 50 % reduction in frequency noise of the comb lines in the frequency range of 10 kHz to 1 MHz and investigate the effect of the secondary servo/cooling noise on the comb.

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Thermorefractive noise reduction of photonic molecule frequency combs using an all-optical servo loop

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