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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 15 — Jul. 19, 2010
  • pp: 16102–16111

Brillouin amplification in phase coherent transfer of optical frequencies over 480 km fiber

O. Terra, G. Grosche, and H. Schnatz  »View Author Affiliations

Optics Express, Vol. 18, Issue 15, pp. 16102-16111 (2010)

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We describe the use of fiber Brillouin amplification (FBA) for the coherent transmission of optical frequencies over a 480 km long optical fiber link. FBA uses the transmission fiber itself for efficient, bi-directional coherent amplification of weak signals with pump powers around 30 mW. In a test setup we measured the gain and the achievable signal-to-noise ratio (SNR) of FBA and compared it to that of the widely used uni-directional Erbium doped fiber amplifiers (EDFA) and to our recently built bi-directional EDFA. We measured also the phase noise introduced by the FBA and used a new and simple technique to stabilize the frequency of the FBA pump laser. We then transferred a stabilized laser frequency over a wide area network with a total fiber length of 480 km using only one intermediate FBA station. After compensating the noise induced by the fiber, the frequency is delivered to the user end with an uncertainty below 2 × 10−18 and an instability σy (τ) = 2 × 10−14 /(τ/s).

© 2010 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(140.0140) Lasers and laser optics : Lasers and laser optics

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: May 18, 2010
Revised Manuscript: June 25, 2010
Manuscript Accepted: June 28, 2010
Published: July 15, 2010

O. Terra, G. Grosche, and H. Schnatz, "Brillouin amplification in phase coherent transfer of optical frequencies over 480 km fiber," Opt. Express 18, 16102-16111 (2010)

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