End-coupling nano optical waveguide type dual-optical-path chip-scale atomic clock

Abstract

The invention discloses an end-coupling nano optical waveguide type dual-optical-path chip-scale atomic clock comprising a laser device. An emergent light beam of the laser device enters a Y-waveguide beam splitter through coupling of the end-coupling input end, wherein one light beam is outputted after passing through a phase modulation unit while the other light beam is outputted after adjust compensation, and the two light beams are outputted after passing through a vertical coupling grating II and a vertical coupling grating III respectively and sequentially pass through a polaroid, attenuation slices, a wave plate, collimation and focusing prior to entering an air chamber. After being emergent, the two light beams are converted into electrical signals through a detection unit, the electrical signals are inputted into an integrated circuit chip through a subtracter, and the integrated circuit chip is used for regulating and controlling the laser device and the phase modulation unit. The end-coupling nano optical waveguide type dual-optical-path chip-scale atomic clock has the advantages that the effect of optical power fluctuation and frequency fluctuation noise can be greatly weakened and the signal-to-noise ratio of the CPT atomic clock can be effectively improved through dual-optical-path common-mode rejection, so that short-term stability of the chip-scale atomic clock can be greatly enhanced.

Description

technical field [0001] The invention belongs to the field of optics and the field of micro-nano systems, in particular to an end-face coupled nano-optical waveguide dual optical path chip-level atomic clock based on the CPT effect. Background technique [0002] As a new type of atomic frequency standard, the chip atomic clock based on the CPT principle can ensure the relative position measurement and precise time synchronization between satellites in the mobile communication constellation. At present, major foreign research institutes and companies have invested energy in developing new structures and new processes of CSAC in order to further reduce the volume and reduce power consumption. It can be seen from foreign research results that the current development performance parameters of chip atomic clocks basically meet some application requirements, and commercial chip atomic clock products have been developed, and great progress has been made. It is difficult to further ...

AI Technical Summary

Problems solved by technology

Although the influence of optical frequency noise fluctuation can be greatly reduced by locking the VCSEL laser to the transition line of the atom, the optical frequency fluctuation noise is still very large

Second, in some VCSELs, mode competition noise between different polarization modes can cause large amplitude noise on the detector

All this noise degrades the short-term frequency stability of chip-scale atomic clocks, leading to the current use of 1mm 3 The best second-order stability achieved by the chip atomic clock in the gas chamber is at 10 -11 magnitude

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