Optical Frequency Comb Calibration for Remote Light Sources
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Solution Overview
Problem
Conventional calibration systems for optical frequencies face challenges such as lengthy calibration processes, increased working hours and downtimes, and low optical performance of iodine-stabilized helium-neon lasers, which hinder the efficient calibration of multiple light sources located at distant places.
Innovation Solution
A remote calibration system that utilizes a master calibration unit equipped with an optical frequency comb device and a slave calibration unit with a light source to be calibrated, connected via an optical transmission unit, allowing for the calibration of optical frequencies without physically transporting the light source to the calibration unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light source to be calibrated is physically transported to the calibration unit for calibration, then the calibration can be performed using conventional methods, but the calibration process becomes lengthy and causes increased downtime and reduced productivity
Solution Approach 1:
The patent replaces the mechanical transport system with an optical transmission system. Instead of physically moving the light source to the calibration unit, the system transmits the light source output through optical fibers to the calibration unit, enabling remote calibration without mechanical handling and significantly reducing calibration time
Solution Approach 2:
The patent introduces optical fibers as an intermediary medium to connect the light source and calibration unit. This intermediary enables the transmission of optical signals over distance, allowing the calibration unit to remotely measure and calibrate the light source frequency without direct physical contact or transport
2Measurement precision
If multiple light sources are calibrated sequentially by transporting each to the calibration unit, then each light source can be calibrated individually, but the total calibration time and man-hours increase significantly
Solution Approach 1:
The patent merges multiple calibration channels into a single calibration unit by combining multiple optical fibers. This allows multiple light sources to be calibrated simultaneously through the same calibration unit, dramatically increasing calibration throughput without compromising accuracy
Solution Approach 2:
The calibration unit is designed with multi-functionality to handle multiple light sources concurrently. By equipping the calibration unit with capabilities to process multiple optical inputs simultaneously, the system achieves both high precision calibration and improved productivity
3Measurement precision
If the light source is removed from the equipment for calibration, then the calibration can be performed, but the equipment experiences downtime and operational interruptions
Solution Approach 1:
The patent segments the calibration function from the operational function. The light source remains in the equipment for operational use while a separate calibration system remotely measures its frequency through optical fiber connections, allowing calibration without interrupting equipment operation
Solution Approach 2:
The patent replaces mechanical removal and physical handling of the light source with optical signal transmission. The light source stays physically installed in the equipment while its output is transmitted via optical fiber to the remote calibration unit, eliminating downtime caused by mechanical intervention
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
Enables efficient and rapid calibration of optical frequencies, reducing downtime and increasing productivity by allowing multiple light sources to be calibrated simultaneously from a remote location, while maintaining high optical performance and stability.
Implementation Method 1
an optical frequency comb device (303)
Implementation Method 2
a method that utilizes a beat signal generated by the interference of the output light of an optical frequency comb device and the output light of the light source to be calibrated
Implementation Method 3
measuring/calibrating the optical frequency using an electrical output of a beat signal
Data Source
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AI summary
The system comprises a slave calibration unit (200-N) equipped with at least one light source to be calibrated, a master calibration unit (300) which measures and calibrates the frequency of a light source to be calibrated, with which the slave calibration unit (200-N) is equipped, by means of an optical frequency comb device, and an optical transmission unit (110) which connects the slave calibration unit (200-N) and the master calibration unit (300). The master calibration unit (300) calibrates an optical frequency of the output light of the light source to be calibrated in the slave calibration unit (200-N), which is transmitted via the optical transmission unit (110), by means of the optical frequency comb device, measuring and calibrating the optical frequency with respect to the electrical output of a beat signal of the output light of the optical frequency comb device and the output light of the light source to be calibrated.Furthermore, the master calibration unit (300) stabilizes the operating frequency of the optical frequency comb device based on an RF oscillator capable of remote calibration based on time and frequency standards.