研究目的
To propose and demonstrate an automatically steering optical beam-forming network for phased array antennas based on dense wavelength division multiplexing, enabling automatic steering without additional control or programming.
研究成果
The proposed automatically steering optical beam-forming network based on DWDM and a fiber loop structure successfully enables automatic steering of phased array antennas without additional control. Experimental results with 8 channels show feasibility, though limitations in delay precision and amplitude uniformity need addressing for practical applications. Future work could optimize the design for higher precision and 2D implementations.
研究不足
Delay precision is limited by fiber cutting accuracy (about 0.2mm, corresponding to 1ps error), amplitude differences between channels (up to 5dB) affect radiation patterns, and the concept-proof demo did not include EDFA for power compensation, limiting the number of re-circulations.
1：Experimental Design and Method Selection:
The experiment involves designing a fiber-optic true-time delay beam-forming network using a re-circulating wavelength-dependent loop with DWDM, optical switch, splitter, and EDFA for loss compensation. Theoretical analysis includes equations for time delays and power output based on splitting ratio.
2：Sample Selection and Data Sources:
An 8-channel laser array matched with DWDM wavelengths from 1545.2nm to 1557nm is used, modulated by a 10GHz RF signal.
3：2nm to 1557nm is used, modulated by a 10GHz RF signal. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Includes laser array, Mach-Zehnder modulator (MZM), optical switch, DWDM components, optical circulator (OC), Faraday reflection mirror (FRM), erbium-doped fiber amplifier (EDFA), photo-detectors (PDs), fiber splitters, and optical spectrum analyzer.
4：Experimental Procedures and Operational Workflow:
Optical signals are modulated by RF, enter the loop via an optical switch, re-circulate for multiple rounds controlled by the switch, and are de-multiplexed and converted to microwave signals for radiation pattern simulation.
5：Data Analysis Methods:
Optical spectrum analysis, power measurement using equations, and simulation of radiation patterns based on time delays and amplitudes.
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optical switch
2x2
Controls the entry and re-circulation of optical signals in the fiber loop.
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optical fiber splitter
Splits optical power in the loop, with ratio p affecting re-circulation.
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DWDM
Provides wavelength-dependent time delays in the optical loop.
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optical circulator
OC
Directs optical signals within the loop.
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Faraday reflection mirror
FRM
Reflects light in the loop, contributing to time delays.
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erbium-doped fiber amplifier
EDFA
Compensates for optical loss in the loop to enable multiple re-circulations.
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photo-detector
PD
Converts optical signals to microwave signals for radiation.
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Mach-Zehnder modulator
MZM
Modulates optical carriers with RF signals.
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optical spectrum analyzer
Measures the optical spectrum of signals.
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laser array
Provides multiple wavelength optical carriers.
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