研究目的
To demonstrate a radio-over-fiber-based hybrid wavelength-division-multiplexed/time division multiplexed passive optical network (PON) for high-speed long-haul optical communication.
研究成果
The proposed ROF-based WDM/TDM PON system demonstrates improved performance with a low noise BLS generated by mutual injection locking of FPLDs. The system achieves a low BER and large eye opening after 25 km transmission, making it suitable for high-speed long-haul optical communication. The power budget supports optical access for 32 subscribers, with potential for further capacity enhancement.
研究不足
The study is limited to a 25 km transmission distance and a data rate of 5 Gbps. The system's flexibility and capacity could be further explored by utilizing more modes of FPLDs and transmitting baseband and RF signals simultaneously.
1：Experimental Design and Method Selection:
The study employs mutual injection locking between two Fabry-Perot laser diodes (FPLDs) to generate a broadband light source (BLS) for seeding WDM channels. A single-arm Mach-Zehnder modulator (MZM) is used for all-optical up-conversion of a 10-GHz
2：25 Gbps RF signal. Sample Selection and Data Sources:
The system is designed to serve 32 subscribers with a data rate of 5 Gbps over 25 km of single-mode fiber (SMF).
3：List of Experimental Equipment and Materials:
Equipment includes FPLDs, optical couplers, isolators, polarization controllers, polarization beam combiners, optical bandpass filters (OBPFs), RF mixers, MZMs, WDM multiplexers/demultiplexers, EDFAs, variable optical attenuators, p-i-n photo detectors, and BER testers.
4：Experimental Procedures and Operational Workflow:
The BLS is generated by mutual injection locking of two FPLDs. The output is filtered to separate carrier waves, modulated, amplified, and transmitted over SMF. At the receiver, signals are demultiplexed, detected, down-converted, and analyzed.
5：Data Analysis Methods:
Performance is analyzed using eye diagrams and bit error rate (BER) measurements.
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Fabry-Perot laser diode
FPLD
Generating broadband light source for seeding WDM channels
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Mach-Zehnder modulator
MZM
All-optical up-conversion of RF signal
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Erbium-doped fiber amplifier
EDFA
Signal power amplification
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Single mode fiber
SMF
Transmission medium
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Optical bandpass filter
OBPF
Separating out carrier waves
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Polarization beam combiner
PBC
Combining outputs of two FPLDs
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RF mixer
Up-converting data with sinusoidal electrical signal
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WDM multiplexer/demultiplexer
4 × 1 WDM multiplexer, 1 × 4 WDM demultiplexer
Multiplexing and demultiplexing signals
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Variable optical attenuator
Controlling the noise figure
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p-i-n photo detector
Detecting optical signals
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BER tester
Testing bit error rate
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