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Optics Letters

Optics Letters


  • Vol. 24, Iss. 7 — Apr. 1, 1999
  • pp: 451–453

Frequency modulation via the Doppler effect in optical fibers

P. Oberson, B. Huttner, and N. Gisin  »View Author Affiliations

Optics Letters, Vol. 24, Issue 7, pp. 451-453 (1999)

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We present the principle of optical frequency modulation via the Doppler effect obtained by rapidly stretching an optical fiber and thus modifying the optical path of the light propagating in the fiber. This procedure creates a pure frequency shift, with no degradation of the spectrum. Moreover, the effect is wavelength independent and can therefore be applied to any type of light source. We show an experimental realization in which a frequency excursion of ~100 MHz was obtained with a bobbin vibrating at 180 Hz.

© 1999 Optical Society of America

OCIS Codes
(060.2340) Fiber optics and optical communications : Fiber optics components
(060.2630) Fiber optics and optical communications : Frequency modulation
(130.6010) Integrated optics : Sensors

P. Oberson, B. Huttner, and N. Gisin, "Frequency modulation via the Doppler effect in optical fibers," Opt. Lett. 24, 451-453 (1999)

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  8. To understand this, let us denote by T the period of the mechanical vibration: T=2p/W. Because of Fourier relations, the uncertainty in the angular frequency measured during this time T is thus given by DwFourier×T≈1. The time-domain approach of Eq. 2 is valid only when the frequency shift is much larger than this uncertainty, which in turn requires that A> >1.
  9. This quality factor a depends on the coupling ratios of the couplers and on the polarization properties of the interferometer.

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