9 November 2024 Stable and wideband-tunable optoelectronic oscillator utilizing a narrow-passband microwave photonic filter
Chengxin Li, Jun Liao, Rui Dai, Jiazhou Li, Zhenghua Luo, Dongsheng Tang, Jingjie Xu, Lin Guo, Wei Wang
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Abstract

An optoelectronic oscillator (OEO) with wide tuning range and stabilized output is proposed and experimentally demonstrated. In the proposed OEO, a narrow-passband microwave photonic filter (MPF) is implemented by a joint operation of a dispersion-induced MPF, an infinite impulse response (IIR) filter based on a double-parallel recirculating delay line, and a two-tap finite impulse response (FIR) filter based on a polarization multiplexed dual-loop. By changing the time delay difference between the two polarization states of the polarization division multiplexing emulator within the dispersion-induced MPF, the central frequency of the narrow-passband MPF can be adjusted, and the tunability of the OEO is realized. A theoretical derivation is achieved, which is verified by an experiment. Tunable oscillation signals from 8.09 to 12.1 GHz at an average tuning step of 500 MHz are generated. With the help of the IIR and two-tap FIR filters, the strong stability and high side-mode suppression performance of the OEO is realized, where the maximum frequency drift of the generated 8.09 GHz signal is observed to be 2.1 kHz over 1 h and its side-mode suppression ratio reaches 61 dB with a frequency span of 5 MHz. The phase noise performance of the scheme is also studied.

© 2024 Society of Photo-Optical Instrumentation Engineers (SPIE)
Chengxin Li, Jun Liao, Rui Dai, Jiazhou Li, Zhenghua Luo, Dongsheng Tang, Jingjie Xu, Lin Guo, and Wei Wang "Stable and wideband-tunable optoelectronic oscillator utilizing a narrow-passband microwave photonic filter," Optical Engineering 63(11), 118102 (9 November 2024). https://doi.org/10.1117/1.OE.63.11.118102
Received: 24 August 2024; Accepted: 14 October 2024; Published: 9 November 2024
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