Electronic Light Synthesizer for Tunable Supercontinuum Generation
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Solution Overview
Problem
Conventional mode locked-laser based frequency combs have limitations such as fixed pulse repetition rates less than 1 GHz and limited spectral broadening efficiency, which restrict their application in advanced communications and quantum sensing applications.
Innovation Solution
An electronic light synthesizer that uses a microwave modulator, self-phase modulator, optical filter, and supercontinuum generator to produce a frequency comb with a wide mode spacing and high spectral broadening, overcoming these limitations by generating supercontinuum light with a 160 THz bandwidth and achieving coherence through optical filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mode locked-laser based frequency combs are used, then pulse repetition rates can be generated, but the pulse repetition rates are fixed and less than 1 GHz
Solution Approach 1:
The patent replaces the mechanical/optical mode-locked laser system with an electronic modulation system. A continuous wave laser is modulated by an electro-optic modulator driven by an electronic oscillator, allowing the pulse repetition rate to be determined by the electronic oscillator frequency rather than mechanical or optical cavity constraints. This enables tunable pulse repetition rates exceeding 1 GHz that are not achievable with conventional mode-locked lasers.
2Quantity of substance
If conventional mode locked-laser based combs are used, then frequency comb generation is achieved, but spectral broadening efficiency is limited
Solution Approach 1:
The patent introduces an electro-optic modulator as an intermediary device between the continuous wave laser and the output. This modulator imprints the electronic oscillator signal onto the optical carrier, creating a frequency comb with enhanced spectral broadening. The modulator acts as a mediator that transfers the tunable electronic frequency to the optical domain, achieving superior spectral broadening efficiency compared to direct mode-locked laser operation.
3Reliability
If optical filtering is applied to achieve coherence, then phase coherence between microwave and optical frequencies is established, but device complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the electronic oscillator that drives the electro-optic modulator also serves as the reference for the output frequency comb. This feedback loop ensures phase coherence between the microwave/electronic frequencies and the optical frequencies without requiring complex optical filtering systems. The electronic feedback path simplifies the overall device architecture while maintaining high phase coherence.
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 electronic light synthesizer provides a phase-coherent link between microwave and optical frequencies with tunable combs, enabling applications like precise optical clocks, molecular identification, and coherent imaging, while overcoming the limitations of conventional mode locked-laser based combs.
Implementation Method 1
a microwave modulator that: receives a continuous wave light comprising an optical frequency; modulates the continuous wave light at a microwave repetition frequency; and produces a frequency comb comprising the optical frequency and modulated at the microwave repetition frequency
Implementation Method 2
a self-phase modulator in optical communication with the microwave modulator and that: receives the frequency comb from the microwave modulator; spectrally broadens an optical wavelength range of the frequency comb; and produces broadened light comprising the optical frequency and modulated at the microwave repetition frequency
Implementation Method 3
an optical filter in optical communication with the self-phase modulator and that: receives the broadened light from the self-phase modulator; and optically filters electronic noise in the broadened light
Implementation Method 4
a supercontinuum generator in optical communication with the optical filter and that: receives the broadened light from the optical filter; spectrally broadens the optical wavelength range of the broadened light; and produces supercontinuum light comprising the optical frequency and modulated at the microwave repetition frequency
Data Source
AI summary
An electronic light synthesizer electronically synthesizes supercontinuum light and includes: a microwave modulator that: receives a continuous wave light including an optical frequency; modulates the continuous wave light at a microwave repetition frequency; and produces a frequency comb modulated at the microwave repetition frequency; a self-phase modulator that: receives the frequency comb; spectrally broadens an optical wavelength range of the frequency comb; and produces broadened light modulated at the microwave repetition frequency; an optical filter that: receives the broadened light from the self-phase modulator; and optically filters electronic noise in the broadened light; and a supercontinuum generator that: receives the broadened light from the optical filter; spectrally broadens the optical wavelength range of the broadened light; and produces supercontinuum light modulated at the microwave repetition frequency.