Optical Filter Resonant Cavities Extinction Ratio Bandwidth
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Solution Overview
Problem
Conventional methods for improving the extinction ratio and bandwidth of optical multiplexers/demultiplexers are costly, cumbersome, and inefficient, posing challenges in effectively separating signal channels with different wavelengths in optical communications.
Innovation Solution
The use of lattice-form optical delay-line circuits with couplers, waveguides, and phase shifters to implement optical half-band filters, which separate channels by adjusting delay and phase shift values, enabling improved frequency division demultiplexing and multiplexing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to improve extinction ratio and bandwidth of optical multiplexers/demultiplexers, then signal channel separation is achieved, but the system becomes costly, cumbersome, and inefficient
Solution Approach 1:
The patent changes the physical parameters of the optical filter, specifically the resonant wavelengths of the first and second cavities, to achieve both high extinction ratio and wide bandwidth. By adjusting the cavity lengths and refractive indices, the filter simultaneously achieves precise wavelength separation (high extinction ratio) and broad transmission bandwidth, eliminating the need for complex cascaded structures.
Solution Approach 2:
The patent divides the optical filter into two independent resonant cavities with different resonant wavelengths. Each cavity handles a specific wavelength range, and their combined response achieves the desired extinction ratio and bandwidth performance. This segmentation allows independent optimization of each cavity while achieving overall system performance that would be difficult with a single cavity or conventional approaches.
2Manufacturing precision
If conventional methods are used to improve extinction ratio and bandwidth, then signal channel separation is achieved, but implementation becomes costly and inefficient
Solution Approach 1:
The patent designs a universal optical filter structure that can handle multiple wavelength channels simultaneously through its two-cavity configuration. The filter achieves both high extinction ratio and wide bandwidth in a single device, making it multi-functional compared to conventional single-cavity filters that would require cascading multiple devices to achieve the same performance. This reduces implementation cost and complexity.
Solution Approach 2:
The patent employs a composite cavity structure where two resonant cavities with different optical properties are integrated into a single filter device. The first cavity is optimized for one wavelength range while the second cavity handles another range, and their composite response achieves the desired performance characteristics. This composite approach allows cost-effective implementation of high-performance filtering without requiring multiple separate components.
3Productivity
If lattice-form optical delay-line circuits with multiple components are used, then frequency division demultiplexing is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple conventional components (multiple filters, delay lines, and phase shifters) into a single integrated optical filter device. The two-cavity resonator structure inherently provides the frequency division demultiplexing function without requiring separate delay-line circuits or multiple cascaded filters, thus improving productivity while reducing device complexity.
Solution Approach 2:
The patent extracts the essential demultiplexing function from complex lattice-form circuits and implements it through a simplified resonant cavity structure. By taking out only the core wavelength-selective filtering function and implementing it through resonant cavities with specifically designed Q-factors and resonant wavelengths, the system achieves efficient frequency division demultiplexing without the cumbersome infrastructure of delay-line circuits.
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 enhances the extinction ratio and bandwidth, allowing for more efficient separation of signal channels with improved attenuation in the stopband, accommodating variations in fabrication and temperature, and meeting increasing bandwidth demands in optical communications.
Implementation Method 1
an first resonant cavity having a first quality factor Q1 and a first resonant wavelength λ1, and an second resonant cavity having a second quality factor Q2 and a second resonant wavelength λ2
Data Source
AI summary
An optical frequency-division demultiplexer, with a plurality of cascaded half-band filters, each of which comprises a plurality of stages. At least a first half-band filter and a second half-band filter have different orders but the same channel spacing.