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Proceedings Paper

Digital implementation of a laser frequency stabilisation technique in the telecommunications band
Author(s): Pritesh Jivan; Adriaan van Brakel; Rodolfo Martínez Manuel; Michael Grobler
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Paper Abstract

Laser frequency stabilisation in the telecommunications band was realised using the Pound-Drever-Hall (PDH) error signal. The transmission spectrum of the Fabry-Perot cavity was used as opposed to the traditionally used reflected spectrum. A comparison was done using an analogue as well as a digitally implemented system. This study forms part of an initial step towards developing a portable optical time and frequency standard.

The frequency discriminator used in the experimental setup was a fibre-based Fabry-Perot etalon. The phase sensitive system made use of the optical heterodyne technique to detect changes in the phase of the system. A lock-in amplifier was used to filter and mix the input signals to generate the error signal. This error signal may then be used to generate a control signal via a PID controller. An error signal was realised at a wavelength of 1556 nm which correlates to an optical frequency of 1.926 THz. An implementation of the analogue PDH technique yielded an error signal with a bandwidth of 6.134 GHz, while a digital implementation yielded a bandwidth of 5.774 GHz.

Paper Details

Date Published: 3 February 2017
PDF: 6 pages
Proc. SPIE 10036, Fourth Conference on Sensors, MEMS, and Electro-Optic Systems, 100360Y (3 February 2017); doi: 10.1117/12.2242627
Show Author Affiliations
Pritesh Jivan, National Metrology Institute of South Africa (South Africa)
Univ. of Johannesburg (South Africa)
Adriaan van Brakel, National Metrology Institute of South Africa (South Africa)
Rodolfo Martínez Manuel, Univ. of Johannesburg (South Africa)
Ctr. de Investigaciones en Óptica, A.C. (Mexico)
Michael Grobler, Univ. of Johannesburg (South Africa)

Published in SPIE Proceedings Vol. 10036:
Fourth Conference on Sensors, MEMS, and Electro-Optic Systems
Monuko du Plessis, Editor(s)

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