Mode Division Multiplexer Optical Signal Equalization
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Solution Overview
Problem
In optical communication systems, existing feed forward equalizers require a large number of high-speed photodiode detectors to superimpose optical components, leading to increased costs and complexity, as well as reduced electrical bandwidth, making it inefficient for processing optical signals with significant distortion.
Innovation Solution
The apparatus and method involve using a mode division multiplexer to perform mode conversion on optical components, allowing them to be superimposed in the optical domain, thereby reducing the number of photodiode detectors needed and enabling equalization within the optical domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large quantity of high-speed photodiode detectors are used to superimpose optical components, then the optical signal can be compensated or equalized, but the device cost increases and the structure becomes more complex
Solution Approach 1:
The patent merges multiple optical components into a single optical domain superposition using a mode division multiplexer, eliminating the need for separate photodiode detectors for each component. This combines multiple detection functions into one optical processing stage, reducing device quantity and structural complexity while maintaining compensation capability
Solution Approach 2:
The patent replaces the electrical domain detection system (multiple photodiode detectors) with an optical domain processing system (mode division multiplexer). This substitution moves the signal processing from electrical components to optical components, reducing the number of high-speed detectors needed and simplifying the overall structure
2Reliability
If a large quantity of high-speed photodiode detectors are used to superimpose optical components, then the optical signal can be compensated or equalized, but the overall electrical bandwidth is reduced
Solution Approach 1:
The patent replaces electrical domain detection with optical domain processing, where the mode division multiplexer handles signal superposition optically rather than electrically. This eliminates the bandwidth limitations imposed by multiple parallel photodiode detectors and their interconnections, achieving higher effective bandwidth
Solution Approach 2:
The patent introduces an optical intermediary (mode division multiplexer) that mediates between the optical components and the final detection stage. This intermediary performs the superposition function in the optical domain, avoiding the electrical bandwidth constraints that would otherwise limit the system performance
3Reliability
If multiple optical components are processed separately and then superimposed in electrical domain, then the equalization can be performed, but the number of high-speed photodiode detectors required increases
Solution Approach 1:
The patent merges multiple optical components into a single optical path using the mode division multiplexer, which performs superposition of all components simultaneously in the optical domain. This consolidates what would require multiple separate detection channels into a single optical processing stage, dramatically reducing the number of photodiode detectors needed
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 reduces the number of photodiode detectors required and allows for efficient optical signal equalization within the optical domain, simplifying the system and maintaining high electrical bandwidth.
Implementation Method 1
a mode division multiplexer, configured to perform mode conversion on the plurality of optical components obtained by the optical delay unit by using delay processing, to obtain a plurality of optical components, where any two of the plurality of optical components obtained by using mode conversion are corresponding to different guided wave modes
Implementation Method 2
a photodiode detector, configured to convert the superimposed optical signal obtained by the mode division multiplexer by using superimposition into a current signal
Implementation Method 3
an optical beam splitter, configured to perform beam splitting processing on the optical signal to obtain a plurality of optical components
Implementation Method 4
an optical delay unit, configured to perform delay processing on the plurality of optical components obtained by the optical beam splitter by using beam splitting processing
Data Source
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AI summary
An apparatus (300) and a method for processing an optical signal are provided. The apparatus includes: an optical beam splitter (310), configured to perform beam splitting processing on the optical signal to obtain a plurality of optical components; an optical delay unit (320), configured to perform delay processing on the plurality of optical components obtained by the optical beam splitter (310) by using beam splitting processing; a mode division multiplexer (330), configured to perform mode conversion on the plurality of optical components obtained by the optical delay unit (320) by using delay processing, to obtain a plurality of optical components, where any two of the plurality of optical components obtained by using mode conversion are corresponding to different guided wave modes, and the mode division multiplexer (330) is further configured to superimpose the plurality of optical components obtained by using mode conversion, to obtain a superimposed optical signal; and a photodiode detector (340), configured to convert the superimposed optical signal obtained by the mode division multiplexer (330) by using superimposition into a current signal. According to the apparatus (300), a plurality of optical components can be superimposed in an optical domain, and a quantity of photodiode detectors (340) can be reduced.