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Experimental demonstration of an optics-based 4-PSK half-adder using nonlinear wave mixing
Optics Letters
|June 30, 2023
Summary
This study presents an optics-based half-adder using nonlinear wave mixing for two 4-phase-shift-keying (4-PSK) data channels. The novel system simultaneously generates Sum and Carry outputs, demonstrating potential for high-speed optical computing.
Area of Science:
- Optoelectronics
- Nonlinear Optics
- Optical Computing
Background:
- Digital signal processing relies on logic gates like adders.
- Implementing adders optically can overcome electronic limitations.
Purpose of the Study:
- To demonstrate an optics-based half-adder for 4-phase-shift-keying (4-PSK) signals.
- To utilize nonlinear wave mixing for generating Sum and Carry outputs simultaneously.
Main Methods:
- Generation of signal groups including original, phase-conjugate, and phase-doubled 4-PSK signals.
- Nonlinear wave mixing in a periodically poled lithium niobate (PPLN) device with a pump laser.
- Simultaneous generation of Sum (A²B²) and Carry (AB + A*B*) outputs.
Main Results:
- Experimental demonstration of the optics-based half-adder.
- Achieved symbol rates between 5 Gbaud and 10 Gbaud.
- Measured conversion efficiencies of approximately -24 dB for Sum and -20 dB for Carry at 5 Gbaud.
- Measured OSNR penalties <10 dB for Sum and <5 dB for Carry at 10 Gbaud.
Conclusions:
- The proposed optics-based half-adder successfully processes 4-PSK data.
- The nonlinear wave mixing approach enables simultaneous generation of Sum and Carry outputs.
- The system shows promise for high-speed optical data processing applications.
