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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 11 — May. 21, 2012
  • pp: 11679–11687

Limitation and improvement in the performance of recirculating delayed self-heterodyne method for high-resolution laser lineshape measurement

Hidemi Tsuchida  »View Author Affiliations


Optics Express, Vol. 20, Issue 11, pp. 11679-11687 (2012)
http://dx.doi.org/10.1364/OE.20.011679


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Abstract

This paper presents a detailed analysis of the performance of a recirculating delayed self-heterodyne (R-DSH) method for high-resolution laser lineshape measurement. For increasing the delay time the R-DSH method utilizes circulation of light in a heterodyne ring interferometer (HRI) containing a frequency shifter, delay fiber, and fiber amplifier. It is shown both theoretically and experimentally that unwanted higher order frequency-shifted components induce distortion in the beat signal spectra, which significantly limits the maximum number of circulations. An effective technique is proposed and demonstrated for reducing the distortion by using optical filtering at the HRI output. Furthermore, a practical limit on the number of circulations is investigated by comparing the shape of observed beat signal spectra with theory. It is shown that the maximum delay is limited to about 180 km even with the use of the optical filtering technique.

© 2012 OSA

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(120.3688) Instrumentation, measurement, and metrology : Lightwave analyzers
(060.2840) Fiber optics and optical communications : Heterodyne

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: April 17, 2012
Revised Manuscript: May 2, 2012
Manuscript Accepted: May 2, 2012
Published: May 7, 2012

Citation
Hidemi Tsuchida, "Limitation and improvement in the performance of recirculating delayed self-heterodyne method for high-resolution laser lineshape measurement," Opt. Express 20, 11679-11687 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-11-11679


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