研究目的
To demonstrate an all-optical majority gate based on a vertical-cavity surface-emitting laser (VCSEL) that allows cascaded operations without changes in wavelength or in signal encoding format.
研究成果
The demonstration of an all-optical majority gate based on a VCSEL shows promise for practical optical computing circuits. The scheme allows cascaded operations without changes in wavelength or in signal encoding format, which are prerequisites for elaborate circuit designs.
研究不足
The experiment was conducted at a rate of 1 GHz with a BER of 10?6. The power budget, speed of operation, and achieved BER are interdependent and dependent on internal laser properties.
1：Experimental Design and Method Selection:
The experiment utilized an injection-locked VCSEL to demonstrate an all-optical majority gate. The principle of operation was based on normalization operations of injection-locked lasers.
2：Sample Selection and Data Sources:
The input signals A, B, and C were phase encoded with binary numbers of 1 and 0 relating to phase-shifts of 0 and π, and complex electric field amplitudes of +1 and ?1, respectively.
3：List of Experimental Equipment and Materials:
External cavity laser (ECL), electro-absorption modulator (EAM), phase modulator (PM), bit pattern generators (BPG), erbium-doped fibre amplifier (EDFA), optical tunable bandpass filter (OF), variable attenuator (ATT), optical circulator (OC), delay-line interferometer (DLI), p-i-n photodiode, Bit Error Ratio Tester (BERT).
4：Experimental Procedures and Operational Workflow:
The combined input of A + B + C was emulated with a tandem of ECL, EAM, and PM. The VCSEL was injected with the emulated superposition of phase encoded signals. The output was measured with a BERT.
5：Data Analysis Methods:
The BER was measured to evaluate the performance of the majority gate.
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external cavity laser
OSICS ECL 1560/P6
Used as a light source in the experiment.
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electro-absorption modulator
Used to modulate the amplitude of the optical signal.
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phase modulator
Used to modulate the phase of the optical signal.
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bit pattern generator
Anritsu MP1755A, Advantest D3186
Anritsu, Advantest
Used to generate bit patterns for the EAM and PM.
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erbium-doped fibre amplifier
Used to amplify the optical signal.
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optical tunable bandpass filter
Used to filter the optical signal.
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variable attenuator
Used to control the optical power of the seeding signal.
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optical circulator
Used to direct the optical signal into the VCSEL and to the output.
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delay-line interferometer
Kylia
Used to measure the differential phase of pulses.
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p-i-n photodiode
HP 11982A
HP
Used to detect the optical signal.
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Bit Error Ratio Tester
Advantest D3286
Advantest
Used to measure the bit error ratio of the received signal.
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