Integrated Photonic Waveguide Assembly for Frequency Comb Stabilization
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Solution Overview
Problem
Current methods for stabilizing the carrier-envelope offset (CEO) frequency and the repetition frequency of a frequency comb in optical atomic clocks require multiple photonic integrated circuits (PICs), leading to increased size and cost.
Innovation Solution
A photonic integrated circuit (PIC) with an optical interface and a supercontinuum generation waveguide (SGW) that spreads the frequency spectrum of a received frequency comb to include a first frequency and a second frequency different from the first frequency, allowing for stabilization of the CEO and repetition frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple photonic integrated circuits (PICs) are used for frequency comb stabilization, then the stabilization precision of CEO and repetition frequencies is improved, but the device size and cost increase
Solution Approach 1:
The patent combines multiple previously separate PIC functions into a single integrated PIC. Specifically, it integrates the supercontinuum generation waveguide, pulse compression waveguide, and frequency doubling waveguide into one device, eliminating the need for multiple separate PICs while maintaining stabilization precision
Solution Approach 2:
The single PIC performs multiple functions simultaneously: it generates supercontinuum spectra, compresses pulses, and doubles frequencies. This multi-functional integration allows one PIC to replace what previously required multiple separate devices, reducing overall system complexity
2Measurement precision
If multiple photonic integrated circuits (PICs) are used for frequency comb stabilization, then the stabilization precision of CEO and repetition frequencies is improved, but the manufacturing cost increases
Solution Approach 1:
By merging multiple PIC functions into a single device, the patent reduces the total number of components that need to be manufactured, assembled, and tested. This integration directly lowers manufacturing costs while preserving the high precision required for frequency comb stabilization
3Device complexity
If a single PIC is used for frequency comb stabilization, then the device size and cost are reduced, but the capability to spread frequency spectrum and compress pulses must be integrated
Solution Approach 1:
The single PIC is designed with multiple waveguides that provide diverse functionality: the supercontinuum generation waveguide spreads the frequency spectrum, the pulse compression waveguide compresses pulses, and the frequency doubling waveguide doubles frequencies. This multi-functionality within one device maintains adaptability while reducing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution enables efficient stabilization of the frequency comb within a single PIC, reducing size and cost while maintaining high precision, thereby improving the performance of optical atomic clocks.
Implementation Method 1
a supercontinuum generation waveguide (SGW) configured to spread a frequency spectrum of the frequency comb to include a first frequency and a second frequency different from the first frequency
Implementation Method 2
a pulse compression waveguide (PCW) configured to compress teeth within the frequency comb
Implementation Method 3
a frequency doubler coupled to an output of the SGW where the frequency doubler is configured to frequency double a portion of the frequency comb at an original frequency
Data Source
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AI summary
Embodiments herein describe generating signals for stabilizing a frequency comb using a PIC that contains a two-segment supercontinuum generator waveguide (SGW). A first segment of the SGW is designed to spread the spectrum of the frequency comb so that a significant portion of the spectral intensity of the frequency comb is at double the original frequency of the frequency comb. A second segment of the SGW is designed to spread the spectrum of the frequency comb so that a significant portion of the spectral intensity of the frequency comb is at a frequency of a reference laser.