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Direct selection and amplification of individual narrowly spaced optical comb modes via injection locking: design and characterization

Direct selection and amplification of individual narrowly spaced optical comb modes via injection locking: design and characterization
Direct selection and amplification of individual narrowly spaced optical comb modes via injection locking: design and characterization
Many applications of optical frequency combs (OFCs) require manipulation and amplification of individual comb modes, e.g., arbitrary waveform generation, terahertz generation and telecommunications. Extracting individual comb modes can be a challenging task for OFCs with narrow comb mode spacings (100 MHz to 10 GHz) due to the limitations of conventional optical filters. Optical injection locking can address this problem, but - due to the relatively large bandwidth (1 to 10 GHz) required for simple (i.e., without the need for additional feedback loops) and stable locking - can struggle when processing OFCs with sub-GHz comb mode spacings. Here, we present an approach to optical injection locking which incorporates a dither-free phase locked loop that allowed for long-term locking to OFCs with comb spacings below the high power injection locking bandwidth. As a result, we achieved robust injection locking directly to a sub-GHz OFC (250 MHz in our experiments). Optimization of the optical injection power is carried out using detailed phase noise characterization. We achieved an Allan deviation for the frequency variation of the slave laser with respect to the injected comb mode (1 s gate time) down to 9.7 times 10-17 and 4.4 times 10-19 at 1 s and 1000 s averaging times respectively, and a phase error variance of 0.02 rad2 (integration bandwidth of 100 Hz to 500 MHz).
0733-8724
2287-2295
Wu, David S.
073959ab-6a4c-49af-a3c0-18437706e72e
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Marra, Giuseppe
e77197ec-35a9-45a5-99dd-2edcaca0cdb1
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Wu, David S.
073959ab-6a4c-49af-a3c0-18437706e72e
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Marra, Giuseppe
e77197ec-35a9-45a5-99dd-2edcaca0cdb1
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3

Wu, David S., Slavík, Radan, Marra, Giuseppe and Richardson, David J. (2013) Direct selection and amplification of individual narrowly spaced optical comb modes via injection locking: design and characterization. IEEE Journal of Lightwave Technology, 31 (14), 2287-2295. (doi:10.1109/JLT.2013.2262921).

Record type: Article

Abstract

Many applications of optical frequency combs (OFCs) require manipulation and amplification of individual comb modes, e.g., arbitrary waveform generation, terahertz generation and telecommunications. Extracting individual comb modes can be a challenging task for OFCs with narrow comb mode spacings (100 MHz to 10 GHz) due to the limitations of conventional optical filters. Optical injection locking can address this problem, but - due to the relatively large bandwidth (1 to 10 GHz) required for simple (i.e., without the need for additional feedback loops) and stable locking - can struggle when processing OFCs with sub-GHz comb mode spacings. Here, we present an approach to optical injection locking which incorporates a dither-free phase locked loop that allowed for long-term locking to OFCs with comb spacings below the high power injection locking bandwidth. As a result, we achieved robust injection locking directly to a sub-GHz OFC (250 MHz in our experiments). Optimization of the optical injection power is carried out using detailed phase noise characterization. We achieved an Allan deviation for the frequency variation of the slave laser with respect to the injected comb mode (1 s gate time) down to 9.7 times 10-17 and 4.4 times 10-19 at 1 s and 1000 s averaging times respectively, and a phase error variance of 0.02 rad2 (integration bandwidth of 100 Hz to 500 MHz).

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More information

Published date: 15 July 2013
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 356367
URI: https://eprints.soton.ac.uk/id/eprint/356367
ISSN: 0733-8724
PURE UUID: 8fb75322-14d2-4371-93b1-014fdcfaf44e
ORCID for Radan Slavík: ORCID iD orcid.org/0000-0002-9336-4262
ORCID for David J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058

Catalogue record

Date deposited: 16 Sep 2013 11:04
Last modified: 26 Nov 2019 02:05

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Contributors

Author: David S. Wu
Author: Radan Slavík ORCID iD
Author: Giuseppe Marra

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