A broadband continuously tunable integrated optical waveguide delay line

By combining a micro-ring structure with an N-bit switch-type optical delay line, broadband continuous tunability of the integrated optical waveguide delay line is achieved, which solves the limitations of bandwidth and delay adjustment range of traditional integrated optical delay lines and improves the beam scanning angular resolution and optical wavelength stability of optical phased array radar.

CN116466435BActive Publication Date: 2026-04-10UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Application Number
CN202310255331.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-16
Publication Date
2026-04-10
Estimated Expiration
2043-03-16

AI Technical Summary

Technical Problem

Existing integrated optical delay lines cannot simultaneously achieve large bandwidth, continuous delay adjustment, and a large delay adjustment range, which limits the beam scanning angular resolution and operating wavelength stability of optical phased array radar.

Method used

By employing a micro-ring structure and an N-bit switching optical delay line, the delay amount is continuously adjusted through the adjustable coupler of the micro-ring structure and the thermo-optical phase shifter. The delay adjustment range is increased by combining the N-bit switching optical delay line, and the coupling coefficient and phase difference are adjusted by the adjustable coupler of the MZI structure, thereby achieving continuous adjustment of optical bandwidth and delay.

Benefits of technology

It achieves large optical bandwidth, low latency fluctuation and large latency adjustment range, improves the beam scanning angular resolution of optical phased array radar and reduces the stability requirements of the working optical wavelength.

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Abstract

The application relates to the field of integrated optics and discloses a broadband continuously adjustable integrated optical waveguide delay line, which comprises a micro-ring structure and an N bit switch type optical delay line; wherein the micro-ring structure comprises an input straight waveguide, one adjustable coupler and one thermo-optic phase shifter; the N bit switch type optical delay line comprises an Nth optical switch, an N-1th optical switch, an N-2th optical switch, an Mth optical switch, an M-1th optical switch, an M-2th optical switch, an M-0th optical switch arranged in sequence, N delay line units arranged between the optical switches and an output straight waveguide. The broadband continuously adjustable integrated optical waveguide delay line provided by the application adopts the micro-ring structure and the N bit switch type optical delay line, realizes the performances of large optical bandwidth, low delay fluctuation, continuously adjustable delay and large delay adjustment range, solves the problems of the limitation of the bandwidth of a traditional phased array radar electric signal and beam deflection, simultaneously reduces the requirement of optical phased array radar for the stability of a working optical wavelength, and improves the beam scanning angle resolution.
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