2D Photodetector Array for High-Speed Optical Communication
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Solution Overview
Problem
Current photodetectors are inadequate for receiving large volumes of data in multi-mode or multi-core transmission systems, particularly in optical communication, where high-speed and massively parallel data reception is required.
Innovation Solution
A two-dimensional photodetector array with closely spaced photodetectors, each with a mesa structure and a digital signal processor for weight coefficient adjustment, capable of receiving light from multi-core fibers and applying modulations to enhance data reception, including a local light generation source and modulation unit for coherent detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photodetectors are arranged in a two-dimensional array to increase data reception capacity, then the ability to receive large volumes of data in multi-mode or multi-core transmission is improved, but the wire width between photodetectors increases which causes signal loss and reduced performance
Solution Approach 1:
The patent changes the critical parameter of wire width from conventional dimensions to not more than 4 μm, enabling high-density photodetector arrangement while maintaining signal integrity. This parameter change allows the system to achieve both high data reception capacity and low signal loss by fundamentally altering the dimensional constraints of the interconnect structure
2Productivity
If photodetector size is reduced to increase array density, then the number of photodetectors per unit area increases enabling massive parallel reception, but the light reception area decreases which reduces sensitivity
Solution Approach 1:
The patent optimizes the photodetector size parameter to not more than 100 μm per side, achieving an optimal balance between array density and light reception area. This parameter optimization enables the system to maintain both high array density for massive parallel reception and sufficient light reception area for adequate sensitivity
3Productivity
If photodetectors are spaced closely to increase integration density, then the overall device size is reduced and integration is improved, but cross-talk between adjacent photodetectors increases
Solution Approach 1:
The patent specifies a spacing parameter of not less than 20 μm between photodetectors, which optimizes the balance between integration density and cross-talk suppression. This parameter specification ensures that photodetectors are closely spaced for high integration while maintaining sufficient isolation to minimize harmful cross-talk effects
4Ease of manufacture
If conventional photodetector designs are used to maintain manufacturing simplicity, then manufacturing processes remain easy and cost-effective, but the system cannot achieve high-speed massively parallel optical communication reception
Solution Approach 1:
The patent divides the photodetector system into a two-dimensional array of discrete, independently operable photodetector elements. Each photodetector is a separate unit with its own readout circuit, allowing the system to achieve massive parallel reception capability while maintaining manufacturing simplicity through modular fabrication processes
Solution Approach 2:
The patent transitions from conventional one-dimensional or single-element photodetector designs to a two-dimensional array configuration. This dimensional change enables massive parallel reception capability by utilizing both horizontal and vertical spatial dimensions, while the modular nature of the array maintains ease of manufacture through standard fabrication techniques
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
Enables instantaneous reception of large volumes of data in multi-mode or multi-core transmission systems, achieving high-speed and efficient data processing with reduced cross-talk and insertion loss, suitable for high-capacity optical communication applications.
Implementation Method 1
a photodetector includes a two-dimensional photodetector array in which a plurality of photodetectors are arranged
Data Source
AI summary
To provide a photodetector which enables reception of massively parallel optical communication, and with which a large volume of data for multi-mode transmission or multi-core transmission can be received instantaneously at once. A photodetector comprising a two-dimensional photodetector array in which a plurality of photodetectors 9 are arranged in a two-dimensional array, and which includes a wire 12 having a width of not more than 4 μm between the plurality of photodetectors. Each of the photodetectors has a light reception area with a side measuring not more than 100 μm. The plurality of photodetectors arranged in a two-dimensional array are spaced apart from each other by not less than 20 μm.