Acta Photonica Sinica, Volume. 49, Issue 8, 0806002(2020)
Microwave Frequency Dissemination via 50 km Optical Fiber Based on Optical Delay Compensation
An experimentally study on microwave frequency transfer over a 50 km long fiber was reported, which frequency instabilities reach 4.38×10-15@1 s and 2.80×10-18@65.5×103 s. By using the well-known Doppler noise cancellation method, the fiber noise was measured by comparing the phase of the signal double-passed fiber and the reference one at local site, and compensate the fiber noise with a home-made fiber-based variable delay line, which includes a fiber stretcher driven by a piezo-transducer for fast action with 1 kHz bandwidth and a temperature controlled fiber spool with a delay adjustment range of 5 ns. Compared with electronic phase compensation technique, this approach is insensitive to microwave leakages which is difficult to avoid in such a case, consequently, enables a better instability for long terms. In addition, we synthesized the back and forward transferred signals into two different frequencies to avoid effect introduced by stray optical reflections, and employ dispersion-compensation fiber to reduce the penalty due to the chromatic dispersion.
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Cui-chen ZHAO, Wen-yu ZHAO, Wen-xiang XUE, Hong-lei QUAN, Lu-lu YAN, Wen-ge GUO, Hai-feng JIANG, Shou-gang ZHANG. Microwave Frequency Dissemination via 50 km Optical Fiber Based on Optical Delay Compensation[J]. Acta Photonica Sinica, 2020, 49(8): 0806002
Category: Fiber Optics and Optical Communications
Received: Apr. 9, 2020
Accepted: Jun. 15, 2020
Published Online: Nov. 27, 2020
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