Broadband microwave photon phase shifter with constant output power

Abstract

The invention provides a broadband microwave photon phase shifter with constant output power. The phase shifter can realize the function of continuously shifting the phase of a high-frequency broadband microwave signal in a range greater than 360 degrees under a single compact micro-ring structure, and reduces the tuning difficulty; meanwhile, the output microwave signal power in the phase shifting process can be kept constant, so that the practicability is improved; and the upper limit of the working frequency of the phase shifter is only determined by the bandwidth of the detector and the free spectral region range of the phase shifter, and the working bandwidth is large. Besides, a tunable laser does not need to be used, the relative position of the optical carrier signal in a resonance spectrum can be changed only by changing the resonant wavelength of the resonator through thermo-optical modulation, the phase shifting function is achieved, and the cost can be reduced.

Description

technical field [0001] The invention belongs to the field of silicon-based optoelectronics and microwave photonics, in particular to a broadband microwave photon phase shifter with constant output power. Background technique [0002] Microwave phase shifter is the core key component in systems such as phased array radar, interferometric antenna array, and satellite communication. Its operating bandwidth, phase shift range, phase shift accuracy, insertion loss and other indicators directly affect the overall performance of the system. For example, in a phased array radar system, the scanning angle of the radar can be flexibly controlled by using the phase shifter array, but limited by the electronic bottleneck, the traditional microwave phase shifter has problems such as small bandwidth, limited phase shift range, and poor anti-interference performance , limiting the target detection and recognition capabilities of phased array radar systems. [0003] Microwave photonic phas...

AI Technical Summary

Problems solved by technology

However, due to the limited phase response range, it is difficult for a single microring resonator to achieve a phase shift in the range of 360°, and the insertion loss will gradually increase with the increase of the phase shift, which will reduce the signal of the microwave photonic phase shifter system. Noise Ratio and Stability

Although the new cascaded microring structure can solve the problem of limited phase shift range, there are still problems such as phase tuning difficulties and thermal crosstalk between microring units.

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