Abstract
In this paper, a simple scheme for the generation of sawtooth, triangular, and square waveforms using an integrated dual-polarization dual-drive Mach-Zehnder modulator (Dpol-DDMZM) is proposed. By properly setting the working point and the modulation index of the Dpol-DDMZM, the desired microwave waveforms are easily obtained after photodetection. The proposed scheme for the photonic generation of microwave waveforms is analyzed both by simulation and experiment. The periodical sawtooth, triangular, and square waveforms with repetition rates of 8 GHz are successfully generated. The root-mean-square errors (RMSE) are 0.190, 0.168, and 0.135, respectively. The system features flexible tunability.
Highlights
In recent years, the microwave signal generation method using microwave photonic technology has become a research hotspot
The external optical modulation method is based on the external modulation of a continuous wave (CW) light using electro-optical modulators
A photonic approach to generate triangular and rectangular waveforms based on a dualparallel Mach-Zehnder modulator (DPMZM) and a tunable bandpass filter (TBPF) was proposed in [12]; the TBPF increased the complexity of the system
Summary
The microwave signal generation method using microwave photonic technology has become a research hotspot. A method of generating multi-functional signals, including short pulses, trapezoidal, triangular, and sawtooth waves, and double pulses based on a dual-driven Mach-Zehnder modulator (DDMZM) was proposed in [10], but additional dispersive fiber was required to filter the signal sideband. The optoelectronic oscillator (OEO) is a well-known high-frequency oscillator for generating low-phase microwave and millimeter-wave signals without employing any external microwave sources, which typically consists of many components such as a laser diode, optical fiber, modulator, photodiode, and a feedback loop complete with an electrical bandpass filter and electrical amplifier. The filtering or dispersive optical devices which have been involved in previous approaches [10–12,15,17] obviate the need This scheme only requires a sinusoidal radio frequency (RF) source, a laser diode (LD), a 3 dB divider, a phase shifter (PS), a dualpolarization dual-drive Mach-Zehnder modulator (Dpol-DDMZM), and a photodetector (PD). The scheme only used a commercial off-the-shelf modulator to generate more kinds of waveforms, which features a simple structure and better universality
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