Kerr-Ring Photonic Circuit for Integrated Optical Frequency Combs
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Solution Overview
Problem
Existing optical signal generation devices for high-frequency comb signals are limited by the difficulty in integrating optical components like lasers into semiconductor materials, leading to miniaturization challenges and inefficiencies in power and bandwidth.
Innovation Solution
An integrated circuit with a Kerr-ring, which is a nonlinear optical waveguide, is used to generate optical frequency comb signals, allowing for integration within a semiconductor chip, enabling higher repetition rates and lower form factors, and incorporating external lasers and photodiodes for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional optical components like lasers are used for frequency comb generation, then signal quality and bandwidth are improved, but device size and complexity increase significantly
Solution Approach 1:
The patent merges multiple separate optical components (laser, modulator, delay line, photodiode) into a single integrated photonic circuit. The laser source, optical modulator, delay element, and photodetector are combined on one chip, eliminating the need for separate components while maintaining signal quality and reducing device complexity.
Solution Approach 2:
The patent implements a nested structure where the optical modulator is positioned within or adjacent to the delay line structure, and the photodiode is integrated at the output of the delay line. This nesting allows compact arrangement of functional elements, reducing overall device footprint while preserving optical signal paths.
2Volume of moving object
If optical components are integrated into semiconductor material, then device size is reduced, but integration difficulty increases
Solution Approach 1:
The patent employs a universal photonic platform that can accommodate multiple optical functions (laser generation, modulation, delay, detection) using the same semiconductor material system and fabrication processes. This multi-functional approach simplifies manufacturing by using standardized processes for all components rather than requiring specialized integration techniques for each component type.
Solution Approach 2:
The patent utilizes changes in optical parameters (wavelength, intensity, phase) through the Kerr effect in the nonlinear optical material to achieve frequency comb generation. By changing the optical intensity parameter through the modulator, the nonlinear material generates new frequency components, enabling compact frequency comb generation without complex mechanical or thermal control mechanisms.
3Measurement precision
If high repetition frequency is used for Dirac pulses, then frequency grid resolution is improved, but power per picket decreases
Solution Approach 1:
The patent uses periodic modulation of the optical signal at high repetition frequencies to generate the frequency comb. The optical modulator applies periodic intensity modulation to the laser signal, creating equidistant frequency components in the spectrum. This periodic action maintains high frequency grid resolution while the nonlinear optical process in the delay line compensates for power reduction through coherent addition of pulse energy.
Solution Approach 2:
The patent exploits phase transitions in the optical domain through the Kerr effect, where intense optical pulses traveling through the nonlinear material experience phase modulation that generates new frequency components. This phase-to-frequency conversion process efficiently transfers power from the fundamental frequency to the comb lines, maintaining power per picket even at high repetition rates.
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 solution enables the miniaturization of high-frequency comb signal generation, achieving higher repetition rates and lower form factors, while reducing costs and improving signal quality, making it suitable for use in test and measurement devices like oscilloscopes and signal generators.
Implementation Method 1
at least one Kerr-ring which is arranged and configured such to generate an optical comb signal from the received optical high frequency signal
Data Source
AI summary
The present invention relates to an integrated circuit, in particular a photonic integrated circuit, for generating an electrical and/or optical frequency comb signal, the integrated circuit comprising: a pulse generation unit comprising an input port for receiving an optical high frequency signal. The present invention provides a Kerr-ring for the generation of an optical frequency comb signal. The use of the Kerr-ring for the optical frequency comb generation makes the integration possible. The present invention further relates to an optical system and a test and measurement device.