A tunable dual-passband microwave photonic filter based on optical slicing and dual-path fiber delay lines

Xu, Zuowei; Fu, Hongyan; Chen, Hao; Xue, Hao; Wu, Congxian; Huang, Chaohong; Xu, Huiying; Caï, Zhiping; Zhang, Dan

doi:10.1016/j.optcom.2015.01.073

Cited by 11 publications

(4 citation statements)

References 23 publications

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“…As the aspect of solving the tuning problem, there are various wide tunable range methods that have been proposed to enhance the flexibility of MPF [ 17 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Essentially, achieving tunability is to change the central frequency or free spectral range of the filter by changing its structural parameters or external physical parameters.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-Narrow Bandwidth Microwave Photonic Filter Implemented by Single Longitudinal Mode Parity Time Symmetry Brillouin Fiber Laser

et al. 2023

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In this paper, a novel microwave photonic filter (MPF) based on a single longitudinal mode Brillouin laser achieved by parity time (PT) symmetry mode selection is proposed, and its unparalleled ultra-narrow bandwidth as low as to sub-kHz together with simple and agile tuning performance is experimentally verified. The Brillouin fiber laser ring resonator is cascaded with a PT symmetric system to achieve this MPF. Wherein, the Brillouin laser resonator is excited by a 5 km single mode fiber to generate Brillouin gain, and the PT symmetric system is configured with Polarization Beam Splitter (PBS) and polarization controller (PC) to achieve PT symmetry. Thanks to the significant enhancement of the gain difference between the main mode and the edge mode when the polarization state PT symmetry system breaks, a single mode oscillating Brillouin laser is generated. Through the selective amplification of sideband modulated signals by ultra-narrow linewidth Brillouin single mode laser gain, the MPF with ultra-narrow single passband performance is obtained. By simply tuning the central wavelength of the stimulated Brillouin scattering (SBS) pumped laser to adjust the Brillouin oscillation frequency, the gain position of the Brillouin laser can be shifted, thereby achieving flexible tunability. The experimental results indicate that the MPF proposed in this paper achieves a single pass band narrow to 72 Hz and the side mode rejection ratio of more than 18 dB, with a center frequency tuning range of 0–20 GHz in the testing range of vector network analysis, which means that the MPF possesses ultra high spectral resolution and enormous potential application value in the domain of ultra fine microwave spectrum filtering such as radar imaging and electronic countermeasures.

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Section: Introductionmentioning

confidence: 99%

“…It is natural to alter the size of dispersion medium. For example, the passband center frequency of the proposed MPF is able to be continuously adjusted by adjusting the length of the dispersion fiber delay line [ 25 ]. But the tuning method of this MPF is full of complexity and hard to achieve continuous tuning.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Narrow Bandwidth Microwave Photonic Filter Implemented by Single Longitudinal Mode Parity Time Symmetry Brillouin Fiber Laser

et al. 2023

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“…A multi-passband MPF with flexibly reconfigurable passbands is urgently demanded for simultaneously selecting, processing, and transmitting the separated frequency channels. In recent years, multiband bandpass MPFs have aroused extensive research interest [11][12][13][14][15][16][17][18][19]. For example, a selectable multi -bandpass MPF based on a two-order high-birefringence fiber loop mirror (HB-FLM) was proposed, three selectable passbands with non-uniform bandwidth were achieved through the polarization state adjustment in the HB-FLM [11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of a selectable multi-passband microwave photonic filter based on cascaded optical comb filters

Wang¹,

Peng²

2021

Optica Applicata

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A multi-passband microwave photonic filter (MPF) with selectable passband frequency, spanning 0–20 GHz frequency range, is proposed, and experimentally demonstrated, in which passband frequency can be flexibly selected within a maximum passband number to four. The scheme is based on the generation of tunable optical comb lines using a broadband optical source sliced by cascaded optical comb filters, achieved by connecting an in-line birefringence fiber filter and a reconfigurable Lyot filter in series, such that various filter tap spacing and spectral combinations are obtained for the configuration of the MPF. The proposed MPF can operate with four different passband states, namely, single-, dual-, triple-, and quadruple-passband, only by adjusting polarization states of the cascaded optical comb filters. All these passbands are with a 3-dB bandwidth varying from 200 to 460 MHz and more than 20-dB sidelobe suppression.

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“…To date, several approaches to achieving tunable dual-passband MPFs have been presented [11]- [16]. In [11] and [12], dual-passband MPFs are realized based on multi-tap delayline configuration, in which a fiber-based Mach-Zehnder interferometer is employed to slice the spectrum of a broadband optical source, and then the modulated light passes through a dispersive medium to achieve filtering. In this technique, the central frequencies of the passbands are tuned by changing the length of the variable optical fiber delay line in the Mach-Zehnder interferometer used as a spectrum slicer.…”

Section: Introductionmentioning

confidence: 99%

Freely Tunable Dual-Passband Microwave Photonic Filter Based on Phase-to-Intensity Modulation Conversion by Stimulated Brillouin Scattering

Zeng

Zhang

et al. 2019

IEEE Photonics J.

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An approach to achieving a highly selective and stable microwave photonic filter (MPF) with two passbands independently tunable is presented. The dual-passband MPF is realized based on phase-to-intensity modulation conversion by stimulated Brillouin scattering. In the proposed scheme, a freely tunable two-tone pump is generated by passing the optical carrier through two cascaded dual-parallel Mach-Zehnder modulators (DPMZMs), with one acting as a frequency shifter with assistance of an electrical 90°hybrid and the other one working at carrier-suppressed double-sideband modulation mode to generate two-tone pump. The two passband locations of the MPF can be freely set by adjusting the frequencies of the two single-tone signals applied to the two DPMZMs. In the experiment, a dualpassband MPF with flexible passband tunability and shape-invariant tuning is demonstrated in the frequency range of 0-9.644 GHz, where the out-of-band rejection ratio and the 3-dB bandwidth of the passbands are measured to be larger than 25 dB and smaller than 55 MHz, respectively. The proposed MPF scheme also has the ability to tailor the shape and the width of the two passbands, which is a promising solution to achieve a freely programable dual-passband MPF.

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A tunable dual-passband microwave photonic filter based on optical slicing and dual-path fiber delay lines

Cited by 11 publications

References 23 publications

Ultra-Narrow Bandwidth Microwave Photonic Filter Implemented by Single Longitudinal Mode Parity Time Symmetry Brillouin Fiber Laser

Ultra-Narrow Bandwidth Microwave Photonic Filter Implemented by Single Longitudinal Mode Parity Time Symmetry Brillouin Fiber Laser

Investigation of a selectable multi-passband microwave photonic filter based on cascaded optical comb filters

Freely Tunable Dual-Passband Microwave Photonic Filter Based on Phase-to-Intensity Modulation Conversion by Stimulated Brillouin Scattering

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