Magnetic field as a kind of objective substance contains abundant physical information, so high sensitivity and resolution measurement for the magnetic field has great significance in scientific and industrial fields. In this work, we verify a highly sensitive cascaded Mach-Zehnder interferometer (C-MZI) sensor based on optical Vernier effect for the magnetic field measurement, which is composed of a reference MZI (R-MZI) without magnetic fluids (MFs) connected in series with a sensing MZI (S-MZI) with MFs. An evident envelope and shift induced by the external magnetic field is observed in the transmission spectra of the C-MZI, resulting in the sensitivity being elevated by an amplification factor. The experimental results reveal a wavelength sensitivity of -5.148 nm/mT in the range of 10.15~30.44 mT, being ~4.77 of that in the single S-MZI. In order to further improve the detection resolution of the magnetic field, a magnetic field measurement system based on the combination of the above S-MZI and an optoelectronic oscillator (OEO) is proposed, and the spectral response is tested in a small magnetic field range of 1.45~1.90 mT, obtaining a spectral sensitivity of 3.18 kHz/mT, which proves the detection of less than 1 Oe. The designed sensor and system possess the merits of high sensitivity, high resolution, simple fabrication, fast response and low phase noise, having broad prospects in the fields of magnetic field measurement.
Microwave photonic technology is a new technology which combines microwave technology and photonic technology. It has great advantages in many aerospace fields such as satellite navigation and space exploration. In the harsh space environment, Fresnel reflection is easy to be produced in the optical connector. In this paper, we build a RF microwave photonic transmission platform to analyse the influences of the optical echo increase and the optical phase change arising from Fresnel reflection of the optical connector on the phase noise. First of all, we present a scheme to simulate the echo of the optical signal caused by the Fresnel reflection. The results show that in our built platform the optical echo caused by the Fresnel reflection can not give rise to phase noise degradation. Secondly, the influence of optical phase change on phase noise by changing the size of air gap is experimentally analysed. As the size rises from 0.3mm to 0.7mm, the phase noise deteriorates to be - 93dBc / Hz at 1kHz.
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