Multi-Wavelength Laser With Vernier Effect Filters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wavelength division multiplexing communications systems face limitations in increasing transmission capacity due to wavelength spacing constraints caused by wavelength errors, leading to crosstalk and reduced efficiency in optical signal transmission.
Innovation Solution
A laser design incorporating multiple semiconductor optical amplifiers and wavelength selective filters with ring resonators and loop mirrors, utilizing the Vernier effect to achieve precise wavelength control and reduce wavelength spacing between emitted laser beams, allowing for independent wavelength selection and increased transmission capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wavelength spacing is reduced to increase transmission capacity, then the number of wavelength channels increases, but wavelength errors cause crosstalk between adjacent channels
Solution Approach 1:
The patent divides a single laser source into multiple independent laser resonators (first resonator, second resonator, third resonator, fourth resonator), each capable of generating laser beams at different wavelengths. This segmentation allows each resonator to independently control its wavelength without affecting others, thereby preventing crosstalk while enabling reduced wavelength spacing for increased transmission capacity
Solution Approach 2:
The patent introduces wavelength selective filters (first wavelength selective filter, second wavelength selective filter, third wavelength selective filter, fourth wavelength selective filter) as intermediary components between the gain media and mirrors. These filters act as mediators that precisely select and control the wavelengths of laser beams, ensuring accurate wavelength separation even when wavelength spacing is reduced, thus preventing crosstalk while maintaining high transmission capacity
2Measurement precision
If multiple independent lasers are used to achieve precise wavelength control, then wavelength accuracy improves, but device complexity increases
Solution Approach 1:
The patent combines multiple laser resonators, gain media, mirrors, and wavelength selective filters into a single integrated laser device structure. The first gain medium with its resonator, second gain medium with resonator, third gain medium with resonator, and fourth gain medium with resonator are all merged into one device, sharing common structural elements and control mechanisms. This merging reduces overall device complexity compared to using completely separate independent lasers while maintaining precise wavelength control through the integrated wavelength selective filters
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 proposed laser configuration enables reduced wavelength spacing, thereby enhancing transmission capacity in wavelength division multiplexing systems by ensuring accurate and independent wavelength control, reducing crosstalk, and improving overall system efficiency.
Implementation Method 1
utilizing the Vernier effect to achieve precise wavelength control and reduce wavelength spacing between emitted laser beams
Implementation Method 2
wavelength selective filters with ring resonators
Implementation Method 3
wavelength selective filters with ring resonators and loop mirrors
Data Source
AI summary
A laser includes first through fourth gain media, first through fifth wavelength selective filters, and first through fourth wavelength selective mirrors. The first through fourth gain media emit laser beams of different wavelengths. Each of the first through fifth wavelength selective filters includes first through fourth input/output ports. The fifth wavelength selective filter selects light of periodic wavelengths. The first through fourth wavelength selective filters have their respective first input/output ports connected to the first through fourth gain media, respectively, have their respective fourth input/output ports connected to the first through fourth wavelength selective mirrors, respectively, and have their respective second input/output ports connected to the first through fourth input/output ports, respectively, of the fifth wavelength selective filter.