Wavelength Conversion Device Temperature Control
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Solution Overview
Problem
Existing wavelength conversion devices face limitations in suppressing fluctuations in wavelength conversion efficiency due to environmental temperature changes, despite efforts to control temperature through thermostatic chambers or limited wavelength dispersion slopes, as the high thermal resistance of optical fibers hinders accurate temperature measurement and control.
Innovation Solution
A wavelength conversion device that includes a nonlinear optical medium and a temperature control unit, where the temperature of the nonlinear optical medium is adjusted based on the intensity of the light generated, maintaining the zero dispersion wavelength near the excitation light wavelength to stabilize wavelength conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the optical fiber is housed in a thermostatic chamber to suppress wavelength conversion band fluctuation, then temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the temperature control function from a complex thermostatic chamber system and implements it through a simplified feedback mechanism using Raman scattered light intensity measurements. This allows temperature stabilization without requiring a full thermostatic chamber, thereby reducing device complexity while maintaining temperature stability.
Solution Approach 2:
The system uses the Raman scattered light generated during normal wavelength conversion operations to derive temperature information, eliminating the need for separate temperature sensors or additional measurement systems. The existing optical infrastructure serves dual purposes: wavelength conversion and temperature monitoring.
2Measurement precision
If temperature measurement is performed using Raman scattered light to control nonlinear optical medium temperature, then temperature control accuracy is improved, but measurement precision deteriorates due to high thermal resistance of optical fibers
Solution Approach 1:
The patent implements a feedback control system where Raman scattered light intensity is continuously monitored and used to adjust the temperature of the nonlinear optical medium. This closed-loop feedback mechanism compensates for measurement uncertainties caused by thermal resistance, maintaining reliable temperature control despite the challenges of optical fiber thermal properties.
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
This approach effectively maintains wavelength conversion efficiency near its maximum value by keeping the nonlinear optical medium's temperature constant, even with environmental temperature changes, thereby reducing the impact of thermal fluctuations on the wavelength conversion band.
Implementation Method 1
a wavelength conversion device that generates, from signal light, new light having a wavelength different from that of the signal light by using a nonlinear optical effect of an optical fiber
Implementation Method 2
A temperature of the optical fiber can be derived from a measurement result of Raman scattered light generated in the optical fiber
Data Source
AI summary
A wavelength conversion device includes a nonlinear optical medium and a controller. The nonlinear optical medium configured to generate light from signal light and excitation light, the excitation light having a wavelength different from a wavelength of the signal light and having a second electric field strength than a first electric field strength of the signal light, the light having a wavelength different from a wavelengths of the signal light and the excitation light. The controller configured to control a first temperature of the nonlinear optical medium based on an intensity of the light.