Silicon-based integrated optical frequency transfer system

Abstract

A silicon-based integrated optical frequency transfer system comprises a local end, an optical fiber link and a user end, and has the advantages of low system noise, compact structure, simple packaging and high reliability.

Description

technical field [0001] The invention relates to optical fiber time and frequency transmission, in particular to a silicon-based integrated optical frequency transmission system. Background technique [0002] Since the frequency of optical atomic clocks is several orders of magnitude higher than that of microwave atomic clocks, optical atomic clocks, including optical ion clocks and optical lattice clocks, can achieve higher frequency stability and accuracy, and the current frequency accuracy is close to 10 -19 It is more than an order of magnitude higher than the existing microwave atomic clocks, and there is still a huge room for improvement. It has become a strong competitor for the next generation of time-frequency benchmarks. The most widely used satellite-based space-based frequency transfer can only achieve 10 -15 / day frequency transmission stability. In addition to the time-frequency transmission method based on space-based satellites, the optical frequency transmi...

AI Technical Summary

Problems solved by technology

However, part of the performance of fiber optic frequency transmission is currently limited by the out-of-band noise of the system. In order to overcome this problem, France proposed the use of temperature control to suppress the impact of out-of-band noise in 20xx. The system is more complex and when the master-slave The inconsistency of the terminal separation temperature will have a greater impact on the accuracy of frequency transmission [see Stefani, F., Lopez, O., Bercy, A., Lee, W.K., Chardonnet, C., Santarelli, G. , Pottie, P.E. and Amy-Klein, A., 2015. Tackling the limits of optical fiber links. JOSA B, 32(5), pp.787-797.]

In 20xx, NIST in the United States proposed to use free-space optical devices to build an optical frequency transfer system, but based on free-space optical devices, it is more complex and less stable [see Williams, P.A., Swann, W.C. and Newbury, N.R., 2008. High-stability transfer of an optical frequency over long fiber-opticlinks. JOSA B,25(8),pp.1284-1293.]

However, the large size of PLC photonic integration is not suitable for CMOS-compatible optoelectronic integration [cf. Akatsuka, T., Goh, T., Imai, H., Oguri, K., Ishizawa, A., Ushijima, I., Ohmae, N., Takamoto, M., Katori, H., Hashimoto, T. and Gotoh, H., 2020. Optical frequency distribution using laser repeaterstations with planar lightwave circuits. Optics express, 28(7), pp.9186-9197. ]

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