研究目的
To design and evaluate high-port-count optical circuit switches for intra-datacenter networking to address the high power consumption and scalability issues of electrical switches.
研究成果
The proposed optical circuit switch architecture can achieve port counts over 1,000 with manageable hardware requirements, validated through simulations and experiments. Monolithic integration reduces losses, and EDFA sharing lowers per-port cost. Future development should focus on fast tunable lasers for coherent systems.
研究不足
The study is limited by the assumptions in simulations (e.g., specific loss values, device characteristics) and the experimental setup's scale (e.g., proof-of-concept for part of a switch). Future work could optimize device integration and reduce losses further.
1：Experimental Design and Method Selection:
The study uses a two-dimensional switching architecture combining space switches and wavelength-routing switches. Computer simulations are conducted to evaluate port counts and hardware requirements for different modulation schemes (10-Gbps IM/DD, 43-Gbps DQPSK/self-coherent, 128-Gbps DP-QPSK/coherent). Proof-of-concept experiments involve fabricating and testing silicon-photonic components.
2：Sample Selection and Data Sources:
Simulations use 96 wavelengths in the C-band with specific parameters. Experimental setup includes fabricated silicon-photonic chips.
3：List of Experimental Equipment and Materials:
Includes silicon-photonic tunable filters, selectors, EDFAs, wavelength multiplexers (e.g., AWG), splitters, transmitters, receivers (APD, PIN PD), and MATLAB for simulations.
4：Experimental Procedures and Operational Workflow:
For simulations, Monte Carlo methods with 10^5 symbols assess BER. Experiments measure power transitions and BER using fabricated devices with controlled EDFA parameters.
5：Data Analysis Methods:
BER calculation considers modulation formats, losses, noise, crosstalk, and uses target BER of 10^-3 with forward-error correction.
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EDFA
Amplifies optical signals to compensate for losses in the switching system.
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AWG
Wavelength multiplexer for aggregating signals.
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Tunable Filter
Extracts specific wavelength signals in the wavelength-routing switch.
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Selector
8×1 selector
Selects one of multiple input signals in the space switch.
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APD
Photodetector for direct detection systems.
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PIN PD
Photodetector for self-coherent and coherent detection systems.
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MATLAB
MathWorks
Software used for Monte Carlo simulations to calculate BER.
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IQ Modulator
IQM
Generates modulated optical signals for experiments.
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Arbitrary Waveform Generator
WG
Generates electrical signals for modulation in experiments.
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