New technique to shift lightwave frequency for distributed fiber optic sensing

Kaoru Shimizu, Toshio Kurashima, Tsuneo Horiguchi, Yahei Koyamada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Frequency translation or shifting is an important technique in many kinds of optical-fiber reflectometry. For example, high-linearity frequency sweep against time is necessary in coherent-OFDR for achieving a high spatial resolution, and changes in the frequency over a wide range is essential for fading noise reduction in coherent-OTDR. In addition, two mutually coherent lightwaves with a frequency difference of about 10 GHz are required in Brillouin-OTDR to realize coherent detection of Brillouin scattered lightwaves. However, conventional techniques are insufficient for these purposes. In this paper, a new technique for the external frequency translation of lightwaves is proposed. This technique enables the high-linearity sweeping of an optical frequency quasi-continuously over a wide range of about 100 GHz. The frequency translator is composed of an optical pulse modulator and an optical ring circuit containing an acousto-optic frequency shifter, an optical amplifier, and a narrow band filter. Here, the acousto-optic frequency shifter and the pulse modulator are synchronously controlled. The pulse launched into the ring circuit experiences a frequency shift at every circulation around the ring circuit. Therefore, the frequency of the output lightwave from the ring circuit is largely translated from that of the original pulse. Its intensity can be kept nearly constant because of balance between gain and loss in the ring circuit. We also demonstrate Brillouin-OTDR as an application.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Place of PublicationBellingham, WA, United States
PublisherPubl by Int Soc for Optical Engineering
Pages18-30
Number of pages13
Volume1797
ISBN (Print)0819409766
Publication statusPublished - 1993
Externally publishedYes
EventDistributed and Multiplexed Fiber Optic Sensors II - Boston, MA, USA
Duration: 1992 Sep 101992 Sep 11

Other

OtherDistributed and Multiplexed Fiber Optic Sensors II
CityBoston, MA, USA
Period92/9/1092/9/11

Fingerprint

Fiber optics
frequency shift
fiber optics
Networks (circuits)
rings
Modulators
Optics
frequency converters
acousto-optics
pulses
linearity
modulators
Light amplifiers
Noise abatement
translators
Optical fibers
sweep frequency
Laser pulses
fading
noise reduction

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Shimizu, K., Kurashima, T., Horiguchi, T., & Koyamada, Y. (1993). New technique to shift lightwave frequency for distributed fiber optic sensing. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 1797, pp. 18-30). Bellingham, WA, United States: Publ by Int Soc for Optical Engineering.

New technique to shift lightwave frequency for distributed fiber optic sensing. / Shimizu, Kaoru; Kurashima, Toshio; Horiguchi, Tsuneo; Koyamada, Yahei.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 1797 Bellingham, WA, United States : Publ by Int Soc for Optical Engineering, 1993. p. 18-30.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Shimizu, K, Kurashima, T, Horiguchi, T & Koyamada, Y 1993, New technique to shift lightwave frequency for distributed fiber optic sensing. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 1797, Publ by Int Soc for Optical Engineering, Bellingham, WA, United States, pp. 18-30, Distributed and Multiplexed Fiber Optic Sensors II, Boston, MA, USA, 92/9/10.
Shimizu K, Kurashima T, Horiguchi T, Koyamada Y. New technique to shift lightwave frequency for distributed fiber optic sensing. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 1797. Bellingham, WA, United States: Publ by Int Soc for Optical Engineering. 1993. p. 18-30
Shimizu, Kaoru ; Kurashima, Toshio ; Horiguchi, Tsuneo ; Koyamada, Yahei. / New technique to shift lightwave frequency for distributed fiber optic sensing. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 1797 Bellingham, WA, United States : Publ by Int Soc for Optical Engineering, 1993. pp. 18-30
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