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Journal of Time and Frequency

Report of optical frequency transfer via fiber

Zhang Lin-b

Published Jan 1, 2013• 0 citations
OpenAlex

Abstract

When a narrow-linewidth laser is transferred through a single-mode optical fiber,the phase noise induced by the environment,results in broadening of the laser linewidth.In this article,we introduced the basic principle of the fiber phase noise suppression,and established the experimental system of it.In the experiment we observed the laser phase noise suppression effect through the system of the fiber phase noise suppressing of a 20 m single-mode fiber,the precision of the optical frequency transfer is better than 3×10-18.

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IEEE photonics journal•Feb 13, 2021•18 citations
When a narrow-linewidth laser is transferred through a single-mode optical fiber,the phase noise induced by the environment,results in broadening of the laser linewidth.In this article,we introduced the basic principle of the fiber phase noise suppression,and established the experimental system of it.In the experiment we observed the laser phase noise suppression effect through the system of the fiber phase noise suppressing of a 20 m single-mode fiber,the precision of the optical frequency transfer is better than 3×10-18.
We present a technique for the 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. When compensating the fiber noise by remote users, the time base at the remote site independent from that at the local site does not destroy the performance of the fiber output light. Using this technique, we demonstrate the transfer of subhertz-linewidth laser light through a 25-km-long, lab-based spooled fiber. After being compensated, the relative linewidth between the fiber input and output light is 1 mHz, and the relative frequency instability is 4×10−17 at 1 s averaging time and scales down to 2×10−19 at 800 s averaging time. The frequency uncertainty of the light after transferring through the fiber relative to that of the input light is 3.0×10−19. This system is suitable for the simultaneous transfer of an optical signal to a number of end users within a city.
광섬유 망을 통해 수 kHz의 좁은 선폭을 가지는 1.5μm1.5{\mu}m1.5μm 레이저광원을 높은 전송 안정도로 전송하였다. 525 m 길이의 단일모드 광섬유를 통과하면서 발생하는 광 위상 잡음을 능동적으로 제거하는 실험 장치를 구성하였고, 이렇게 하여 전송된 광 주파수의 전송 안정도는 1 초의 평균시간에서 2×10−172{\times}10^{-17}2×10−17 로 측정되었다. 전송된 광 주파수의 품질을 주파수 영역과 시간 영역에서 정량적으로 분석하였다. We have transferred a narrow-linewidth 1.5μm1.5{\mu}m1.5μm laser beam through a 525 m fiber network with excellent transfer stability. The fiber-induced optical phase noise during the fiber transmission is cancelled by configuring a noise-canceling servo. The transfer instability was 2×10−172{\times}10^{-17}2×10−17 at 1 s of averaging time. We quantitatively analyzed the transferred optical frequency in the frequency domain and in the time domain.
We demonstrate optical coherence transfer of subhertz-linewidth laser light through fiber links by actively compensating random fiber phase noise induced by environmental perturbations. The relative linewidth of laser light after transferring through a 32-km urban fiber link is suppressed within 1 mHz (resolution bandwidth limited), and the absolute linewidth of the transferred laser light is less than 0.36 Hz. For an 82-km fiber link, a repeater station is constructed between a 32-km urban fiber and a 50-km spooled fiber to recover the spectral purity. A relative linewidth of 1 mHz is also demonstrated for light transferring through the 82-km cascaded fiber. Such an optical signal distribution network based on repeater stations allows optical coherence and synchronization available over spatially separated places.
The stability of the transmitted optical frequency in a single bidirectionally operated fiber was compared with stability in a link consisting of two separate unidirectional fibers. The measurements were performed in a standard closed-loop system canceling the fiber induced phase noise. It was found that phase fluctuations in the higher frequency band (acoustic noise) are well suppressed in both configurations (single bidirectional fiber and separate unidirectional fibers). The long-term drifts however are not fully compensated in a link consisting of two separate unidirectional fibers, but still about two orders of magnitude noise reduction was observed in comparison with not compensated transfer.
We report the effect of the double Rayleigh backscattering (DRB) noise, in which the interference of the signal light with the double Rayleigh backscattered light, on the fiber-optic radio-frequency (RF) transfer system. Here, we theoretically analyze and experimentally demonstrate that the DRB noise within the fiber link will become the dominative noise on the fiber-optic RF transfer system once narrow linewidth lasers are used. The strong DRB noise is experimentally confirmed through the measurement of the effect of the coherent interference term of the signal light and the double Rayleigh backscattered light on the 100 km RF transfer system. Our results provide evidence that the conventional RF transfer technique with the telecommunications-grade lasers, in which the chromatic dispersion effect in the single-mode fiber is compensated by dispersion compensation fibers (DCFs), could be the better choice for high-performance RF transfer.