Fabry-Perot Raman Pumping with Fiber Bragg Wavelength Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical amplifiers using Fabry-Perot pump lasers face issues with relative intensity noise (RIN) and varying oscillation wavelengths, making them unsuitable for forward optical pumping in WDM transmission.
Innovation Solution
A temperature and current dependent pump laser system is used, combined with a Fiber Bragg grating reflector, to generate and tune a pumping beam with precise frequency and power levels, ensuring alignment with target bands for efficient forward optical pumping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Fabry-Perot pump laser is used for optical pumping, then the laser can generate light beam, but the relative intensity noise (RIN) and oscillation wavelength variability increase
Solution Approach 1:
An optical filter is introduced as an intermediary component between the Fabry-Perot pump laser and the optical fiber. This filter selectively transmits only the desired wavelength range while blocking other wavelengths, thereby reducing the relative intensity noise and wavelength variability generated by the laser. The filter acts as a mediator that cleans up the laser output before it enters the optical fiber for signal amplification.
2Reliability
If a Fabry-Perot pump laser is used for optical pumping, then the laser can generate light beam, but the oscillation wavelength variability increases
Solution Approach 1:
An optical filter is introduced as an intermediary component between the Fabry-Perot pump laser and the optical fiber. This filter selectively transmits only the desired wavelength range while blocking other wavelengths, thereby reducing the relative intensity noise and wavelength variability generated by the laser. The filter acts as a mediator that cleans up the laser output before it enters the optical fiber for signal amplification.
3Productivity
If optical pumping is used to amplify optical signals, then signal amplification is achieved, but relative intensity noise and wavelength variability make it unsuitable for WDM transmission
Solution Approach 1:
An optical filter is introduced as an intermediary component between the Fabry-Perot pump laser and the optical fiber. This filter selectively transmits only the desired wavelength range while blocking other wavelengths, thereby reducing the relative intensity noise and wavelength variability generated by the laser. The filter acts as a mediator that cleans up the laser output before it enters the optical fiber for signal amplification.
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 system reduces RIN and wavelength variability, enabling effective amplification of WDM signals with improved signal quality and consistency.
Implementation Method 1
a first tuning temperature is provided to the pump laser while providing the fixed input current. The first tuning temperature is based on a target band of a pumping beam and causes the pump laser to generate a light beam having a first frequency band
Implementation Method 2
a second tuning temperature is provided to a temperature dependent optical reflector configured to receive the light beam generated by the pump laser. The second tuning temperature is based on the target band of the pumping beam and causes the optical reflector to reflect light of the light beam that is within a second frequency band
Data Source
AI summary
A fixed input current is provided to a pump laser of an optical pumping block. Further, a first tuning temperature is provided to the pump laser while providing the fixed input current. The first tuning temperature is based on a target band of a pumping beam and causes the pump laser to generate a light beam having a first frequency band that is dictated by the first tuning temperature and the fixed input current. Further, a second tuning temperature is provided to a temperature dependent optical reflector configured to receive the light beam. The second tuning temperature is based on the target band of the pumping beam and causes the optical reflector to reflect light of the light beam that is within a second frequency band that corresponds to the target frequency band. The reflected light beam is emitted into a transmission optical medium configured to carry an optical signal.