Multi-Carrier Optical Signal Reception via Single Coherent Device
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Solution Overview
Problem
Current multi-carrier optical signal reception methods require multiple independent coherent reception devices, leading to high costs and power consumption due to the need for separate devices for each carrier, which complicates the processing and increases complexity.
Innovation Solution
A method and device that mix a multi-carrier optical signal with a local optical signal of the same center frequency, followed by photoelectric conversion, analog-to-digital conversion, FFT processing, grouping, and IFFT processing to separate carriers, allowing data restoration from a single set of coherent reception devices, thereby reducing costs and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent coherent reception devices are used for each carrier, then each carrier can be received independently and coherently, but the cost and power consumption increase significantly
Solution Approach 1:
The patent combines multiple carrier reception functions into a single coherent reception device. Instead of using separate mixers, PDs, ADCs, and DSPs for each carrier, the invention uses one set of these components to receive and process multiple carriers simultaneously through shared signal paths and centralized digital signal processing.
Solution Approach 2:
The coherent reception device is designed to perform multiple functions - receiving and processing multiple different carriers using the same hardware components. The single device universally handles various carriers by configuring the same mixer, PD, ADC, and DSP to process different frequency channels, eliminating the need for dedicated per-carrier equipment.
2Reliability
If multiple independent coherent reception devices are used for each carrier, then each carrier can be received independently and coherently, but the system complexity increases
Solution Approach 1:
The patent merges multiple independent reception chains into a single integrated system. The mixer, photoconductive detector, analog-to-digital converter, and digital signal processor are shared resources that handle multiple carriers through time-division or frequency-division multiplexing, reducing the overall number of components and interconnections.
Solution Approach 2:
While combining hardware resources, the patent segments the signal processing tasks in the digital domain. The DSP divides the received multi-carrier signal into separate carrier channels for independent processing, maintaining the ability to handle each carrier individually while using shared physical hardware, thus reducing complexity without sacrificing reception quality.
3Reliability
If multiple independent coherent reception devices are used for each carrier, then each carrier can be received independently and coherently, but the cost increases due to multiple sets of equipment
Solution Approach 1:
The patent combines multiple expensive coherent reception equipment sets into a single shared system. By merging the mixer, photoconductive detector, analog-to-digital converter, and digital signal processor into one unified device that serves multiple carriers, the overall system cost is reduced while maintaining coherent reception capability for each carrier.
4Reliability
If multiple independent coherent reception devices are used for each carrier, then each carrier can be received independently and coherently, but the power consumption increases due to multiple devices operating simultaneously
Solution Approach 1:
The patent merges multiple power-consuming coherent reception devices into a single shared system. The same mixer, photoconductive detector, ADC, and DSP process multiple carriers sequentially or simultaneously, reducing the total power consumption by eliminating redundant hardware operations while preserving the coherent reception quality needed for reliable carrier detection and demodulation.
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 enables low-cost, low-power multi-carrier optical signal reception with simplified processing, facilitating the sharing of channel information and parameters between carriers, and reducing system complexity.
Implementation Method 1
a mixer, configured to receive a multi-carrier optical signal and a local optical signal, and mix the multi-carrier optical signal with the local optical signal
Implementation Method 2
a PD (Photoconductive Detector, photoconductive detector), configured to perform photoelectric conversion on an optical signal output by the mixer to obtain an electrical signal
Data Source
Figure 1~2A
Figure 2B
Figure 2C
AI summary
The present invention relates to the field of communications, and in particular, to a method and a device for receiving a multi-carrier optical signal. The method includes: mixing a multi-carrier optical signal with a local optical signal having the same center frequency as the center frequency of the multi-carrier optical signal; performing photoelectric conversion and analog-to-digital conversion in succession on an optical signal obtained through the mixing to obtain a digital signal; performing fast Fourier transform FFT on the digital signal to obtain a frequency domain signal; grouping the frequency domain signal according to each frequency band corresponding to its respective carrier in the multi-carrier optical signal, and performing inverse fast Fourier transform IFFT on each frequency domain signal group obtained through the grouping to obtain a corresponding time domain signal for each carrier; and performing data restoration on each time domain signal corresponding to its respective carrier to obtain data carried on each carrier. The solutions of the present invention only require one set of coherent reception device, and have low cost and low power consumption.