Polarization-Multiplexed Signal Receiver for Digital IQ Restoration
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Solution Overview
Problem
Conventional microwave photon zero-intermediate frequency receivers face challenges in precisely controlling orthogonal polarization states of light, which is costly and difficult to implement, hindering efficient baseband signal restoration.
Innovation Solution
A signal receiving apparatus and method that splits a polarization multiplexing optical signal into multiple paths, converts the signals into linearly polarized optical signals, and performs analog-to-digital conversion on these signals in a digital domain to restore the IQ signal without requiring precise control of orthogonal polarization states, using components like optical splitters, photoelectric detectors, and digital signal processors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional circuit simulation method is used to restore IQ signal, then baseband signal can be restored, but orthogonal polarization state and phase difference of light need to be precisely controlled which is difficult and costly to implement
Solution Approach 1:
The patent replaces the conventional circuit simulation method with a digital signal processing method. Instead of using complex optical circuitry to simulate IQ signal restoration, the invention uses digital processing of photodetector outputs to achieve the same function, thereby eliminating the need for precise orthogonal polarization control
Solution Approach 2:
The invention changes the working parameters from requiring precise polarization state control to accepting arbitrary polarization states. By using digital signal processing algorithms, the system can restore IQ signals from photodetector outputs regardless of the input polarization state, effectively changing the control parameter from polarization precision to digital processing capability
2Ease of manufacture
If conventional microwave photon zero-intermediate frequency receiver is used, then low cost and small size are achieved, but precise control of orthogonal polarization state is required which increases system cost
Solution Approach 1:
The patent substitutes digital signal processing for complex optical polarization control mechanisms. The digital processing unit receives photodetector outputs and performs IQ signal restoration through computational algorithms, replacing the need for precision polarization control hardware and simplifying manufacturing requirements
3Measurement precision
If orthogonal polarization state control is implemented, then IQ signal restoration accuracy is improved, but system cost and complexity increase
Solution Approach 1:
The invention replaces complex polarization control circuitry with digital signal processing. The photodetector outputs are fed directly to a digital processing unit that performs IQ signal restoration through computational methods, achieving high accuracy without the need for complex optical polarization control circuits
Solution Approach 2:
The patent introduces a digital processing unit as an intermediary between the photodetectors and the IQ signal output. This digital intermediary performs the signal restoration function that would otherwise require complex polarization control, simplifying the overall system architecture
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 simplifies the circuit architecture, reduces system costs, and enables easy restoration of baseband signals by eliminating the need for precise polarization control, thereby enhancing efficiency and reducing costs.
Implementation Method 1
an optical splitter configured to: receive a first polarization multiplexing optical signal from a remote apparatus, split the first polarization multiplexing optical signal into at least two paths to obtain at least two second polarization multiplexing optical signals
Implementation Method 2
The photoelectric detector is configured to convert the linearly polarized optical signal into an analog signal
Data Source
AI summary
A signal receiving apparatus and method are provided. When a baseband signal is restored, an orthogonal polarization state of light does not need to be precisely controlled. This is easy to implement and can reduce system costs. The apparatus includes an optical splitter configured to split a first polarization multiplexing optical signal into at least two second polarization multiplexing optical signals, and input the two second polarization multiplexing optical signals into at least two optical signal processing modules. An optical signal processing module is configured to couple the second polarization multiplexing optical signal, and input a coupled optical signal to a photoelectric detector configured to convert the coupled optical signal into an analog signal. An analog-to-digital converter is configured to convert the analog signal into a digital signal, and input the digital signal to a digital signal processor configured to process the digital signal to obtain a baseband signal.