OAM Signal Reception via Phase Shifter Demodulation
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Solution Overview
Problem
There is a need for an efficient method to receive signals transmitted based on the orbital angular momentum (OAM) of photons in optical wireless communication systems, which existing technologies have not adequately addressed.
Innovation Solution
A receiving user equipment (UE) is designed with a transceiver, a demodulator comprising at least one phase shifter, an optical-to-electrical (O-to-E) converter with photodiodes, and additional components like an OAM demultiplexer, phase error corrector, and average interference tracker to efficiently decode OAM signals, utilizing a phase shifter array and photodiode array to convert and process OAM signals into electrical signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a receiving UE is designed with a demodulator composed of at least one phase shifter and an O-to-E converter composed of at least one photodiode to efficiently receive OAM signals, then the signal reception efficiency is improved, but the device complexity increases
Solution Approach 1:
The demodulator is segmented into multiple phase shifters that can be independently controlled to handle different OAM modes, while the photodiode array is divided into multiple elements for parallel signal detection. This segmentation enables efficient OAM signal reception by distributing the processing function across multiple simpler components.
Solution Approach 2:
The phase shifter acts as an intermediary component that converts OAM mode optical signals into Gaussian mode signals before they reach the photodiode array. This intermediary conversion simplifies the detection process by transforming complex OAM signals into a format that can be efficiently processed by the photodiode array and subsequent electronics.
2Measurement precision
If additional components like OAM demultiplexer, phase error corrector, and average interference tracker are added to decode OAM signals, then the signal decoding accuracy is improved, but the device complexity increases
Solution Approach 1:
The phase error corrector performs preliminary phase correction on the received optical signals before they are converted to electrical signals and processed further. The average interference tracker measures and characterizes interference patterns in advance, enabling the system to compensate for these interference effects. These preliminary actions reduce the computational burden and improve the accuracy of subsequent signal decoding operations.
Solution Approach 2:
The average interference tracker measures interference generated in the electrical signal and removes the measured interference from the electrical signal. This feedback mechanism continuously monitors the signal quality and adjusts the processing parameters to maintain high decoding accuracy even in the presence of varying interference conditions.
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 configuration enables efficient reception and decoding of OAM signals, minimizing interference and phase errors, thereby enhancing the performance of optical wireless communication systems.
Implementation Method 1
the at least one phase shifter converts the optical signal of the OAM mode into an optical signal of the Gaussian mode
Implementation Method 2
the at least one photodiode converts the optical signal of the Gaussian mode into an electrical signal
Data Source
AI summary
Proposed is a receiving UE for receiving a signal in optical wireless communication, according to the present disclosure. The receiving UE may include: a transceiver for receiving an optical signal of an orbital angular momentum (OAM) mode from a transmitting terminal; a demodulator composed of at least one phase shifter; a photoelectricity converter composed of at least one photodiode; and a processor connected to the transceiver, the demodulator, and the photoelectricity converter. In addition, the at least one phase shifter may convert an optical signal of the OAM mode into an optical signal of a Gaussian mode, and the at least one photodiode may convert an optical signal of the Gaussian mode into an electrical signal.