We proposed a new and simple scheme to implement exclusive OR (XOR) and not exclusive OR (NXOR) logic operations in the optical domain enabled by a dual-parallel phase modulator (PM). Both the intensity and phase of the optical signal are utilized to represent the four different states of two binary inputs, and direct detection is used to map the four states to the corresponding binary output. Through numerical analysis, two PMs with phase offsets were adjusted to π / 2, and the phase shifter between the two PMs was controlled atπ / 2; thus, the NXOR logic gate was successfully carried out. Two PMs with phase offsets were adjusted to π / 2, and the phase shifter between the two PMs was controlled atπ; thus, the XOR logic gate was successfully carried out. Simulations were successfully carried out at the speed of 10 Gb/s.
In this work, a 12-tupling frequency millimeter wave generation scheme based on four-wave mixing (FWM) in a semiconductor optical amplifier (SOA) is proposed. A dual parallel Mach Zehnder modulator (DPMZM) is used to generate pure 2nd order optical tones which are sent into a SOA to realize the 2nd order and 6th order optical sideband output due to the effect of the FWM. An optical filter is employed to filter out 2nd order optical tone and the pure 6th order optical sidebands are obtained. A 12-tupling frequency millimeter wave can be generated by beating the 6th order optical sidebands in the photodetector (PD). The working principle of the system is analyzed in detail, and the feasibility of the scheme is verified in the simulation results.
We propose a novel filterless approach to generate high-quality optical frequency 16-tupling millimeter-wave based on only two MZMs. OSSR higher than 30.34 dB and RFSSR not less than 23.79 dB are achieved in this scheme.
In this work, we propose a novel approach to generate high-quality optical millimeter-wave signals using frequency 12-tupling without an optical filter. The proposed approach is comprised of one dual parallel Mach- Zehnder modulators. The two sub-MZMs, biased at the maximum optical transmission point, which is only used for even-order optical harmonic generation, and introduces a phase shift on the optical output signal between the sub- MZMs. By properly adjusting the MZM biasing point, RF LO voltages and phases shift, sixth order optical sidebands only are generated which can result in 12-tupled mm-wave at the photo detector. Optical sideband suppression ratio (OSSR) higher than 37.65 dB and radio frequency spurious sideband suppression ratio (RFSSR) not less than 32.08 dB are achieved in this scheme. The performance of the signal in terms of OSSR and RFSSR is discussed, and the effects of non-ideal factors on OSSR and RFSSR are analyzed.
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