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.
KEYWORDS: Signal to noise ratio, Optical networks, Receivers, Transmitters, Critical dimension metrology, Networks, Multiplexing, Digital signal processing, Fiber optic communications
A method of using pilot-tone to monitor optical signal-to-noise ratio (OSNR) is proposed in the paper. High-order statistical moments of pilot component are utilized to evaluate the noise level of the transmitted optical signals. This method of OSNR monitoring has the advantage of insensitivity to chromatic dispersion (CD) and polarization mode dispersion (PMD). Simulations are carried out in optical Nyquist transmission system. It is shown that the method has 1 dB monitoring accuracy over a wide OSNR range from 5 dB to 25 dB.
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