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Tunable dual-passband microwave photonic filter based on stimulated brillouin scattering

A technology of stimulated Brillouin and microwave photons, which is applied in instruments, optics, nonlinear optics, etc., can solve the problems of unstable filter response and complicated tuning process, and achieve the effect of improving stability and high stop band rejection ratio

Active Publication Date: 2016-05-18
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The microwave photon filter structure (referred to in this patent application as Figure 1B ) considered the effect of the SBS attenuation spectrum, and used an additional laser source as the optical pump to achieve a large tuning range by overlapping and balancing the gain spectrum and attenuation spectrum, but the use of two independent laser sources will cause the filter response to be different. stable, and its tuning process is very complex

Method used

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  • Tunable dual-passband microwave photonic filter based on stimulated brillouin scattering
  • Tunable dual-passband microwave photonic filter based on stimulated brillouin scattering
  • Tunable dual-passband microwave photonic filter based on stimulated brillouin scattering

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Embodiment 1

[0110] Using MATLAB2008a simulation software to build figure 2 The simulation model of a tunable dual-passband microwave photonic filter based on stimulated Brillouin scattering (SBS) is shown. Set the driving frequency f m 8GHz, 6GHz and 4GHz respectively (such as Figure 7A , Figure 7B and Figure 7C ). Both the Stokes gain and the anti-Stokes loss affect the frequency at f B + f m and f B -f m The bandpass response of the oscillator works, and as the oscillator frequency increases, the frequency separation between the two passbands also increases. The simulation results show that the frequency response of the SBS at 10.9GHz shifts symmetrically, and the amplitudes of the two passbands are equal.

[0111] Figure 8 Dual-wavelength Brillouin pumping in the carrier-suppressed state is demonstrated. When the driving frequency of the electro-optic modulator 3C is 3GHz, it can be seen from the figure that the power of pump1 and pump2 is 20dB higher than the strength ...

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Abstract

The invention discloses a tunable dual-passband microwave photonic filter based on stimulated brillouin scattering. The filter conducts closed-loop control on an electro-optical modulator through a bias feedback control module, so that the electro-optical modulator outputs stable dual-passband modulation signals suppressed by narrow waves, carrier suppression dual-passband modulation optical signals output by the electro-optical modulator serve as a pumping source of an SBS, and accordingly two passbands are formed on filter responses. The designed filter achieves amplitude responses of the dual-passband filter according to Stokes gain and anti-Stokes loss. The filter can achieve the narrow bandwidth of 20.1 MHz, can achieve tuning in the range of 1.8 GHz-20 GHz, and obtains the stop-band suppression rate over 35 dB.

Description

technical field [0001] The invention relates to a microwave photon filter, more particularly, to a tunable double-passband microwave photon filter based on stimulated Brillouin scattering. Background technique [0002] Microwave photonic filter (MPF) is a device that filters microwave / radio frequency (RF) signals in the optical domain. In wireless communication systems, MPF can be used to distinguish different frequency bands and improve signal by reducing crosstalk between adjacent channels. the quality of. Because stimulated Brillouin scattering (SBS) has highly selective gain spectrum and attenuation spectrum, as well as low threshold and integratable characteristics, it is widely used in microwave photon filtering technology to achieve narrow bandwidth filtering. [0003] At present, the SBS-based microwave photonic filter is mainly researched on the single-passband filtering characteristics, and the dual-passband and multi-passband filters are often ignored. In additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/035
CPCG02F1/035
Inventor 胡姝玲肖泽宇牛燕雄李军王欢欢万梓傲
Owner BEIHANG UNIV
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