Adjustable broadband photonic RF phase shifter based on highly nonlinear fiber loop

Abstract

The invention belongs to the technical field of phase shifters, and particularly relates to an adjustable broadband photonic RF phase shifter based on a highly nonlinear fiber loop. A first continuous wave laser is connected with a signal generator. The signal generator is connected with a first polarization controller through a first erbium-doped fiber amplifier and a first band-pass filter. A second continuous wave laser is connected with a second polarization controller through a second erbium-doped fiber amplifier, a second band-pass filter and an attenuator. The first polarization controller and the second polarization controller are connected with the highly nonlinear fiber ring through a coupler. The highly nonlinear fiber ring is connected to a photodetector through a third erbium-doped fiber amplifier and a third band-pass filter. The photodetector is connected with an oscilloscope. The problems of bandwidth limitation and narrow phase shift tuning range existing in the operation of the conventional radio frequency phase shifter can be solved. The adjustable broadband photonic RF phase shifter based on the highly nonlinear fiber loop is mainly used for photon phase shifting.

Description

technical field [0001] The invention belongs to the technical field of phase shifters, and in particular relates to an adjustable broadband photonic radio frequency phase shifter based on a highly nonlinear optical fiber ring. Background technique [0002] Radio frequency phase shifters have appeared and played an increasingly important role in phased array beams, which have formed systems and are widely used in smart antennas. However, radio frequency phase shifters suffer from bandwidth limitations and narrow phase shift tuning ranges in operation. [0003] Optical systems have the advantages of flexibility, high bandwidth, and lightweight, and photonic elements that control phase shifts used in recent studies have attracted widespread attention. Various techniques to achieve photon phase shifting have been reported, including wavelength-converted lasers in distributed feedback, stimulated Brillouin scattering signal processing, homodyne mixing and vector sum methods. Ho...

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems, the present invention provides an adjustable broadband photonic radio frequency phase shifter based on a highly nonlinear optical fiber ring, which solves the problem of bandwidth limitation and narrow phase shift tuning range of conventional radio frequency phase shifters in operation. question

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