Abstract
In this paper, we propose a stable radio frequency(RF) transmission scheme for optical link based on Dual drive Mach-Zehnder modulator(DDMZM). By frequency mixing, the phase jitter of the output signal caused by environment variation has been automatically compensated. Different from other passive compensation schemes, the reference signal and the pre-compensation signal are modulated on one optical carrier by a DDMZM, and the crosstalk of two RF signals can be depressed by using dispersion compensation and adjusting the bias voltage of DDMZM, without multiple frequency multiplications and divisions. Meanwhile, the noises induced by Rayleigh scattering can be suppressed by using acousto-optic modulator. Our scheme is featured by single laser diode employed and no extra phase jitter induced by wavelength differences, with the advantages of simple structure and cost-effectiveness. In the experiment, we demonstrate 10 GHz RF signal stability transmission over 50 km single mode fiber, the phase jitter mean square error is 0.82 ps during 10 hours.
Highlights
Stable radio frequency (RF) signals are widely used in deep space communication, antenna array [1], [2] and basic physical measurement [3]
In this paper, we propose a stable radio frequency(RF) transmission scheme for optical link based on Dual drive Mach-Zehnder modulator(DDMZM)
Different from other passive compensation schemes, the reference signal and the pre-compensation signal are modulated on one optical carrier by a DDMZM, and the crosstalk of two RF signals can be depressed by using dispersion compensation and adjusting the bias voltage of DDMZM, without multiple frequency multiplications and divisions
Summary
Stable radio frequency (RF) signals are widely used in deep space communication, antenna array [1], [2] and basic physical measurement [3]. Remote, and using wavelength tunable laser to change the time delay of RF signal transmission over fiber [10], [11]. These schemes can greatly reduce the phase jitter, with the advantage of low noise. In order to avoid the interference between reference signal and the pre-compensation signal, the two RF signals are modulated on different lasers [12]–[14], [17] or changed several times by frequency conversion modules [15], [16], which increase the systematic complexity and cost. The crosstalk can be effectively depressed by means of controlling the dispersion parameter of optical link and bias voltage of DDMZM, without using different lasers or multiple frequency multiplications and divisions. We successfully achieve 10 GHz RF signal transmission of phase stabilization via 50 km single mode fiber(SMF), and the phase jitter mean square error(RMS) is only 0.82 ps during 10 hours
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