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Ultra-Compact Widely Tunable Dual-Passband Microwave Photonic Bandpass Filter
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DOI：10.1109/jlt.2026.3698412.png)
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Abstract
En 中文
A microwave photonic bandpass filter capable of generating two independent frequency-tunable passbands is presented. It is based on two different-frequency laser sources followed by a photonic integrated chip consisting of a phase modulator and a microring resonator (MRR) with a pair of electrodes. The MRR resonances introduce amplitude imbalances between the two opposite-phase RF modulation sidebands. This enables RF signals at two different frequencies, corresponding to the differences between the laser source continuous wave light frequencies and the MRR resonance frequencies, to pass through the system. This is equivalent to having two passbands in the system amplitude response. The proposed dual-passband bandpass filter overcomes the drawbacks of bulky implementation, high system cost and complexity, frequency-dependent response shape, as well as noise and dynamic range issues encountered in previously reported structures. High-speed tuning of the two passband frequencies is achieved by electrically tuning the MRR resonances, while independent tuning is enabled by additionally adjusting a laser frequency. Experimental results are presented that demonstrate independent tuning of two passbands over a frequency range of 2 to 25 GHz via controlling the voltage of the driving signal applied to the MRR electrodes and adjusting the frequency of a laser source. Results also demonstrate that the 3 dB passband width remains within 385 ± 25 MHz, and the passband amplitude varies by less than ±1.5 dB during frequency tuning.
Keywords:
Bandpass filters
integrated optics
microwave filters
optical signal processing
ring resonator
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