研究目的
To review recent developments in microwave photonic devices based on liquid crystal on silicon (LCOS) technology, focusing on notch filters, phase shifters, couplers, and a new multi-function signal processor.
研究成果
Microwave photonic devices based on LCOS technology offer advantages such as reconfigurability, parallel signal processing, and robust performance. The reviewed devices, including notch filters, phase shifters, and couplers, demonstrate wide bandwidth operation, tunability, and stability. The new multi-function signal processor can simultaneously perform time shifting, phase shifting, and amplitude control over a 10-40 GHz range, with improved SNR and power performance, making it suitable for applications in radar, electronic warfare, and communication systems.
研究不足
The lower operating frequency is limited by the LCOS optical processor's filter bandwidth (10 GHz for commercial devices), and the upper frequency is limited by the optical phase modulator bandwidth (around 65 GHz for commercial devices). Response time of LCOS processors is around 500 ms, which may be slow for some applications like phased array antenna systems requiring fast beam steering.
1：Experimental Design and Method Selection:
The paper reviews various experimental setups using LCOS-based optical processors for microwave photonic devices, including notch filters, phase shifters, and couplers. It describes the use of optical phase modulators, multi-wavelength sources, and dispersive media.
2：Sample Selection and Data Sources:
Experiments used optical sources such as FP lasers, wavelength-tunable lasers, and commercial laser arrays. Data were measured using network analyzers and electrical spectrum analyzers.
3：List of Experimental Equipment and Materials:
Equipment includes LCOS-based optical processors (e.g., WaveShaper), optical phase modulators, photodetectors, diffraction gratings, dispersive media (e.g., 20 km standard single mode fiber), and various lasers.
4：Experimental Procedures and Operational Workflow:
Procedures involve generating continuous wave light, phase modulating with RF signals, processing with LCOS devices, introducing delays via dispersive media, and detecting signals with photodetectors to measure frequency responses, phase shifts, and amplitudes.
5：Data Analysis Methods:
Data were analyzed for amplitude response, phase response, group delay, signal-to-noise ratio (SNR), and stability over time using network analyzers and spectrum analyzers.
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WaveShaper
4000A
Finisar
Programmable optical processor for controlling amplitude and phase of optical signals, used in microwave photonic devices for filtering, phase shifting, and coupling operations.
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Photodetector
XPDV412XR
Finisar
Converts optical signals to electrical RF signals, used in the detection stage of microwave photonic devices.
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Optical Phase Modulator
EOSpace
Modulates optical carriers with RF signals, based on electro-optic effect, used for generating phase-modulated optical signals.
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FP Laser
Generates multiple wavelengths for use as optical sources in notch filters and other devices.
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Wavelength-Tunable Laser
Provides tunable single-wavelength light for experiments requiring precise wavelength control.
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Network Analyzer
Measures amplitude and phase responses of microwave signals in experiments.
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Electrical Spectrum Analyzer
Measures RF signal power and noise floor for SNR calculations.
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Standard Single Mode Fiber
Used as a dispersive medium to introduce time delays in notch filter experiments.
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Diffraction Grating
Disperses input optical signals in LCOS-based optical processors.
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Optical Circulator
Routes optical signals in specific directions, used in hybrid coupler structures.
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Optical Coupler
2-to-1 50:50
Combines optical signals from different paths.
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