Brillouin-assisted microwave frequency measurement with adjustable measurement range and resolution

Abstract

We present a reconfigurable microwave frequency measurement technique with adjustable measurement range and resolution. The key novelty of the technique is the employment of stimulated Brillouin scattering, which results in a tunable amplitude comparison function, leading to an adjustable measurement range and resolution. The proposed technique is switchable between a wideband tunable narrow measurement range (~2 GHz) with high resolution (±0.05 GHz) and a fixed wide measurement range (12 GHz) with moderate resolution (±0.25 GHz).

Multiple microwave frequencies measurement based on stimulated Brillouin scattering with ultra-wide range

“…In the actual measurement, the strain of fiber can be kept constant, but the variation of the ambient temperature is inevitable which will change the Brillouin frequency shift, and it is necessary to try to keep the ambient temperature constant. We can see that if the temperature control (with accuracy of 0.05 • C) was performed, the fiber strain remains unchanged, so the error caused by Brillouin frequency shift will be very small [18]. The second term on the right-hand side:…”

Instantaneous microwave frequency measurement using four-wave mixing in a chalcogenide chip

“…These applications would greatly benefit from the development of IFM systems capable of extremely high frequency (EHF) band operation, as can be realized by optical processing of microwave signals [2]. Indeed, there have been numerous proposals for implementing high-bandwidth microwave IFM systems using optical components [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Reduced Cost Amplitude Independent Photonic RF Frequency Measurement System

“…By measuring the amplitude of the output signal, the RF frequency can be estimated. This could be done via traversing the modulated optical carrier through a dispersive or polarization dependent medium [1]- [3], or employing stimulated Brillouin scattering [4], or converting phase modulated optical carrier to intensity modulated carrier [5]. The other approach to achieve the comparison function was presented based on a specific fiber Bragg grating (FBG) [6].…”