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Finesse Limits in hollow core fiber based Fabry-Perot interferometers

Finesse Limits in hollow core fiber based Fabry-Perot interferometers
Finesse Limits in hollow core fiber based Fabry-Perot interferometers
Due to their low sensitivity to changes to the external environment, low optical nonlinearity, low chromatic dispersion, and compatibility with fiber systems, hollow-core optical fibers (HCFs) represent an ideal medium for fiber Fabry-Perot interferometers (FPs). Many applications can benefit from the availability of FPs with high finesse or high finesse-length product. However, the mechanisms that limit the performance of HCF-based FPs are yet to be fully elucidated to the best of our knowledge. In this paper, we present a comprehensive analysis of several factors that impact HCF-FP performance and limit their finesse, e. g., mirror tilt, the distance between the HCF end-face and mirror, HCF cleave angle and HCF attenuation. In a sequence of experiments, we built and characterized five HCF-FPs with lengths ranging from 0.65 m to 9.25 m. By fitting the experimental data with derived analytical expressions, we found the mirror-assisted coupling loss to be below -0.0028 dB (corresponding to a coupling efficiency of 99.94%), which should allow finesse values greater than 5000 to be achieved. Experimentally, we demonstrate here a value of 2400, limited by the parameters of the mirrors available to us presently. We then show that the low coupling loss and high repeatability of mirror alignment and HCF cleave quality allows the effective use of such high-finesse FP for reliable measurements of HCF attenuation, even with short fiber length samples (10 m in our demonstration).
Couplings, Fabry-Perot, Loss measurement, Mirrors, Optical fiber dispersion, Optical fibers, Propagation losses, Reflectivity, hollow-core fibers, interferometers, optical fiber devices
0733-8724
4489-4495
Ding, Meng
45fbd64c-522d-45ff-a918-013404105cdb
Numkam Fokoua, Eric
6d9f7e50-dc3b-440a-a0b9-f4a08dd02ccd
Bradley, Thomas J.
d4cce4f3-bb69-4e14-baee-cd6a88e38101
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d
Ding, Meng
45fbd64c-522d-45ff-a918-013404105cdb
Numkam Fokoua, Eric
6d9f7e50-dc3b-440a-a0b9-f4a08dd02ccd
Bradley, Thomas J.
d4cce4f3-bb69-4e14-baee-cd6a88e38101
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Slavík, Radan
2591726a-ecc0-4d1a-8e1d-4d0fd8da8f7d

Ding, Meng, Numkam Fokoua, Eric, Bradley, Thomas J., Poletti, Francesco, Richardson, David J. and Slavík, Radan (2021) Finesse Limits in hollow core fiber based Fabry-Perot interferometers. IEEE Journal of Lightwave Technology, 39 (13), 4489-4495. (doi:10.1109/JLT.2021.3074140).

Record type: Article

Abstract

Due to their low sensitivity to changes to the external environment, low optical nonlinearity, low chromatic dispersion, and compatibility with fiber systems, hollow-core optical fibers (HCFs) represent an ideal medium for fiber Fabry-Perot interferometers (FPs). Many applications can benefit from the availability of FPs with high finesse or high finesse-length product. However, the mechanisms that limit the performance of HCF-based FPs are yet to be fully elucidated to the best of our knowledge. In this paper, we present a comprehensive analysis of several factors that impact HCF-FP performance and limit their finesse, e. g., mirror tilt, the distance between the HCF end-face and mirror, HCF cleave angle and HCF attenuation. In a sequence of experiments, we built and characterized five HCF-FPs with lengths ranging from 0.65 m to 9.25 m. By fitting the experimental data with derived analytical expressions, we found the mirror-assisted coupling loss to be below -0.0028 dB (corresponding to a coupling efficiency of 99.94%), which should allow finesse values greater than 5000 to be achieved. Experimentally, we demonstrate here a value of 2400, limited by the parameters of the mirrors available to us presently. We then show that the low coupling loss and high repeatability of mirror alignment and HCF cleave quality allows the effective use of such high-finesse FP for reliable measurements of HCF attenuation, even with short fiber length samples (10 m in our demonstration).

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Finesse Limits in Hollow Core Fiber based Fabry-Perot interferometers - Accepted Manuscript
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e-pub ahead of print date: 20 April 2021
Keywords: Couplings, Fabry-Perot, Loss measurement, Mirrors, Optical fiber dispersion, Optical fibers, Propagation losses, Reflectivity, hollow-core fibers, interferometers, optical fiber devices

Identifiers

Local EPrints ID: 450446
URI: http://eprints.soton.ac.uk/id/eprint/450446
ISSN: 0733-8724
PURE UUID: f5322718-1e1d-4d04-bde1-de875b179955
ORCID for Eric Numkam Fokoua: ORCID iD orcid.org/0000-0003-0873-911X
ORCID for Thomas J. Bradley: ORCID iD orcid.org/0000-0001-6568-5811
ORCID for Francesco Poletti: ORCID iD orcid.org/0000-0002-1000-3083
ORCID for David J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058
ORCID for Radan Slavík: ORCID iD orcid.org/0000-0002-9336-4262

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Date deposited: 28 Jul 2021 16:31
Last modified: 29 Jul 2021 01:44

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