Optical frequency transfer over a single-span 1840-km fiber link

Droste, Stefan; Udem, Thomas; Hänsch, Theodor W.; Holzwarth, Ronald; Ozimek, F.; Raupach, S. M. F.; Schnatz, H.; Grosche, G.

doi:10.1109/eftf-ifc.2013.6702150

Cited by 56 publications

(79 citation statements)

References 13 publications

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“…Two home-made bidirectional Erbium-doped fiber amplifiers (EDFAs) have been adopted after 70 km and 145 km fiber link for boosting the fading optical signal. This proof-of-principle demonstration was over 145 km, but the technique is equally applicable to longer fiber by inserting more bidirectional amplifiers along the fiber link [11], [12]. The angular frequencies of AOMs at the local and remote sites are ω l = 2π × 45 MHz (AOM l , downshifted mode), ω r1 = 2π × 80 MHz (AOM r1 , upshifted mode) and ω r2 = 2π × 80 MHz (AOM r2 , downshifted mode), respectively.…”

Section: A Experimental Apparatusmentioning

confidence: 99%

Multi-node optical frequency dissemination with post automatic phase correction

Kong

et al. 2020

J. Lightwave Technol.

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We report a technique for coherence transfer of laser light through a fiber link, where the optical phase noise induced by environmental perturbation via the fiber link is compensated by remote users with passive phase noise correction, rather than at the input as is conventional. Neither phase discrimination nor active phase tracking is required due to the open-loop design, mitigating some technical problems such as the limited compensation speed and the finite compensation precision as conventional active phase noise cancellation. We theoretically analyze and experimentally demonstrate that the delay effect introduced residual fiber phase noise after noise compensation is a factor of 7 higher than the conventional techniques. Using this technique, we demonstrate the transfer laser light through a 145-km-long, lab-based spooled fiber. After being compensated, the relative frequency instability in terms of overlapping Allan deviation is 1.9 × 10 −15 at 1s averaging time and scales down 5.3×10 −19 at 10,000 s averaging time. The frequency uncertainty of the light after transferring through the fiber relative to that of the input light is (−0.36 ± 2.6) × 10 −18 . As the transmitted optical signal remains unaltered until it reaches the remote sites, it can be transmitted simultaneously to multiple remote sites on an arbitrarily complex fiber network, paving a way to develop a multi-node optical frequency dissemination system with post automatic phase noise correction for a number of end users.Index Terms-Fiber-optic radio frequency transfer, optical frequency transfer, metrology.

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Section: A Experimental Apparatusmentioning

confidence: 99%

Multi-node optical frequency dissemination with post automatic phase correction

Kong

et al. 2020

J. Lightwave Technol.

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“…After characterizing the transfer of a 194 THz optical carrier along those fiber links [5], we set up an 1840 km link by connecting the two 920 km links in series, with the setup described in [6]. We managed to transmit an optical frequency over this 1840 km fiber link, demonstrating superior instability (modified Allan deviation) which reaches ~ 4 x 10 -19 after only 100 s of measurement time (see Figure 1).…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

“…In recent years, the transfer of highly stable optical frequencies with the help of fiber links has attracted great attention as it opens the possibility to remotely compare optical atomic clocks [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Optical frequency transfer via 1840 km fiber link with superior stability

Droste

Ozimek

Udem

et al. 2014

2014 IEEE International Frequency Control Symposium (FCS)

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“…The most impressive results are that PTB and MPQ in Germany demonstrated a stability of 1E-19 over a dedicated commercial fiber link with a length up to 1840km [19], which surpasses the requirement for optical clock comparison today by more than one order of magnitude.…”

Section: Introductionmentioning

confidence: 89%

Experimental study on optical frequency transfer via communication fibers

Liu

Gao

et al. 2014

2014 IEEE International Frequency Control Symposium (FCS)

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Along with the rapid development of the optical clocks, optical frequency transfer via communication fibers has shown much higher precision than the conventional methods. In this paper, we report the progress on the optical frequency transfer via communication fibers at NTSC. Over a 71-km spooled fiber, the optical frequency transfer with a residual instability (Allan deviation) of 5.4E-15 at 1s and 5.6E-18 at 10 4 s is demonstrated. Furthermore, for a measurement bandwidth of 100 Hz, the instability is 1.2E-15 at one second and 1.4E-18 at 10 4 s. This transfer instability is fundamentally limited by the fiber length. The Allan deviation curves fall as τ -1 for short times, which is consistent with the fact that the transferred signal is dominated by white phase noise. This experimental achievement provides the foundation for the upcoming optical transfer experiment over a 300-km urban communication fiber link.

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Optical frequency transfer over a single-span 1840-km fiber link

Cited by 56 publications

References 13 publications

Multi-node optical frequency dissemination with post automatic phase correction

Multi-node optical frequency dissemination with post automatic phase correction

Optical frequency transfer via 1840 km fiber link with superior stability

Experimental study on optical frequency transfer via communication fibers

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