研究目的
To propose and demonstrate a scheme for generating tunable millimeter-wave signals with improved performance by employing a UFBG-based AOTF and compensating for the bit walk-off effect to increase transmission distance and reduce BER.
研究成果
The proposed system successfully generates tunable mm-wave signals at 20 GHz, 40 GHz, and 60 GHz with improved performance by compensating for the bit walk-off effect. This allows for transmission distances up to 60 km and reduced BER values compared to previous systems. The use of UFBG helps mitigate dispersion, enabling higher data rates up to 5 Gbps. The method supports multiple frequency bands with different data, making it suitable for various applications like automotive radar and wireless HD video streaming.
研究不足
The study is based on simulation using Optisystem software, which may not fully capture real-world imperfections and variations. The system complexity might still be high due to the use of multiple components like the AOTF and interleaver. The compensation method assumes ideal conditions and may not account for all dispersion effects or nonlinearities in practical scenarios.
1：Experimental Design and Method Selection:
The methodology involves using a UFBG-based AOTF for wavelength selection to generate tunable mm-wave signals with frequency multiplication factors of 2n (n=1,2,3). The system includes a dual-drive Mach-Zehnder modulator (DD-MZM) for modulation, and bit walk-off effect compensation is implemented by modulating only one sideband (USB or LSB) using a WDM interleaver.
2：3). The system includes a dual-drive Mach-Zehnder modulator (DD-MZM) for modulation, and bit walk-off effect compensation is implemented by modulating only one sideband (USB or LSB) using a WDM interleaver. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Simulation-based approach using Optisystem software; no physical samples or datasets specified.
3：List of Experimental Equipment and Materials:
Tunable laser (TL), dual-drive Mach-Zehnder modulator (DD-MZM), UFBG-based AOTF, optical circulator, optical band stop filter (OBSF), WDM interleaver, erbium-doped fiber amplifier (EDFA), single-mode fiber (SMF), photodetector (PD), quadrature amplitude demodulator (QADM), bit-error-rate tester (BERT).
4：Experimental Procedures and Operational Workflow:
A continuous lightwave from a TL is modulated by a DD-MZM driven by an RF signal. The output is filtered by the UFBG-based AOTF to select specific sidebands. The carrier is suppressed using an OBSF. One sideband is separated and modulated with data, then coupled with the unmodulated sideband. The signal is amplified by an EDFA and transmitted through SMF. At the receiver, a PD detects the signal, and BER is measured.
5：Data Analysis Methods:
Simulation results include electrical spectra, constellation diagrams, eye diagrams, and BER performance analysis using Optisystem software with 8192 samples, 128 sequence length, and 64 samples per bit.
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Optisystem
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Optiwave
Simulation software used to model and verify the design of the mm-wave signal generation system.
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Tunable Laser
Generates a continuous lightwave at a specific frequency for modulation.
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Dual-Drive Mach-Zehnder Modulator
DD-MZM
Modulates the optical carrier with an RF signal to generate sidebands.
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UFBG-based AOTF
Filters and selects specific sidebands for mm-wave generation by tuning acoustic frequency.
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Optical Circulator
Routes optical signals between ports; used to direct light to and from the AOTF.
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Optical Band Stop Filter
OBSF
Suppresses the residual optical carrier after modulation.
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WDM Interleaver
Separates the upper and lower sidebands for individual modulation.
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Erbium-Doped Fiber Amplifier
EDFA
Amplifies the optical signal before transmission to compensate for losses.
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Single-Mode Fiber
SMF
Transmits the optical signal over distance; introduces dispersion and attenuation.
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Photodetector
PIN PD
Converts the optical signal to an electrical mm-wave signal for detection.
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Quadrature Amplitude Demodulator
QADM
Demodulates the mm-wave signal to baseband for performance analysis.
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Bit-Error-Rate Tester
BERT
Measures the bit error rate of the transmitted signal to evaluate system performance.
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