A Frequency-Doubling Optoelectronic Oscillator using a Three-Arm Dual-Output Mach-Zehnder Modulator

Abstract

This paper proposes a frequency-doubling optoelectronic oscillator employing a novel three-arm dualoutput Mach-Zehnder modulator (MZM). One output of the MZM generates the fundamental-frequency signal which is recycled by the microwave optical fiber link for oscillation, and the other output can generate the frequency-doubled signal. Experiment was conducted using a commercial two-arm MZM, a phase modulator, and an optical fiber link of 89 meters in length. A 19-GHz frequency-doubled signal was successively obtained with fundamental signal suppression more than 36 dB.

A Novel Measurement Approach for the Half-wave Voltage of Phase Modulator based on PM-MZI Photonic Link

“…Owing to the more linear conversion of input voltage to optical phase and requiring no bias controller, the LiNbO 3 electro-optic phase modulator (PM) attracts a great deal of attention and has a host of applications [2,3], such as microwave photonic links [4], optoelectronic oscillators [5,6], optical comb generators, and all-optical microwave filters [7]. The half-wave voltage (V π ) is one of the most significant parameters to characterize a PM, which is the voltage required to produce π radians optical phase shift and represents the modulation efficiency of the PM.…”

The Optical Design of Achromatic Phase Matching System Based on ZEMAX

“…With the fast development of femtosecond pulse generation, second harmonic generation (SHG) has attracted a great deal of attention [1][2][3][4][5]. However a finite phase matching-bandwidth places limitations in frequency doubling of ultrashort pulses [6][7][8][9].…”

Microwave frequency doubling by synchronising and polarisation multiplexing the optical signals from a dual‐output Mach–Zehnder modulator

“…Introduction: Doubling the frequency of a microwave signal in the optical domain has gained attention for its promise to provide low phase-noise, high spectral-purity signals. Such signals are useful in radio-over-fibre communications, optical communications, and wireless communications [1][2][3][4][5][6][7][8][9]. Previous frequency-doubling techniques generally fall into two categories: those based on a directly driven optical modulator and those based on an optoelectronic oscillator (OEO) that contains an optical modulator.…”

“…Previous frequency-doubling techniques generally fall into two categories: those based on a directly driven optical modulator and those based on an optoelectronic oscillator (OEO) that contains an optical modulator. OEOs have produced signals at 20 GHz using a polarisation modulator (PolM) [1], 6 GHz using a PolM along with a highly non-linear fibre [2], and 19 GHz using a three-arm Mach-Zehnder modulator (MZM) [3]. These techniques yielded contrasts of 27, 42.3, and 36 dB, respectively, between the doubled-frequency tone and the residual fundamental tone, but each required an electrical bandpass filter (EBPF) to isolate the doubled frequency and an electrical amplifier to raise up the desired tone.…”