Spectral measuring method and device based on stimulated Brillouin scattering sideband modulation
A stimulated Brillouin and spectral measurement technology, applied in the field of spectral measurement, can solve the problems of reducing the dynamic range of the measurement, affecting the universality and accuracy of the measurement scheme, and submerging, and achieving the effect of improving the sideband suppression ratio
Inactive Publication Date: 2019-01-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0006] Although the measurement device has unparalleled measurement accuracy (theoretically, it can reach the same accuracy as the electric spectrum analysis technology), but due to the non-ideality of optical single sideband modulation, the optical signal to be measured near the vestigial sideband and its frequency will also be The beat frequency component is generated in the photodetector, and even submerges the beat frequency component of the optical signal to be measured near the sweep frequency sideband and its frequency, resulting in a reduction in the measurement dynamic range and affecting the universality and accuracy of the measurement scheme
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[0033] Aiming at the deficiencies of the existing technology, the solution idea of the present invention is to perform sideband shaping based on stimulated Brillouin scattering on the optical local oscillator signal based on the existing spectral measurement method based on frequency-sweeping light source and coherent photodetection, The narrow-band gain effect of SBS is used to amplify the sweep sidebands, while its attenuation effect is used to suppress the residual sidebands, thereby improving the sideband suppression ratio to achieve spectral measurement with a large dynamic range.
[0034] The SBS effect is the result of the interaction of pump light, Stokes light, and acoustic waves in a medium such as an optical fiber. Once the incident light power in the fiber reaches the Brillouin threshold, a nonlinear effect will occur, forming narrow-band gain and narrow-band attenuation on both sides of the pump light, manifested as amplified Stokes light and attenuated anti-Stok...
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The invention discloses a spectral measuring method and device based on stimulated Brillouin scattering sideband modulation. The method comprises the following steps: modulating a first microwave frequency sweep signal to a narrow linewidth optical carrier, and generating a carrier-suppressed optical single-sideband modulation signal; carrying out a sideband modulation based on stimulated Brillouin scattering (SBS) on the optical single-sideband modulation signal; and using the modulated optical single-sideband modulation signal as an optical local oscillator signal, and measuring the spectrumof a to-be-measured optical signal by using a spectral measuring method based on a microwave sweep source and a coherent photoelectric detection. The invention further discloses a spectral measuringdevice based on stimulated Brillouin scattering sideband modulation. On the basis of the existing spectral measuring method based on a sweep optical source and the coherent photoelectric detection, asweep sideband is amplified by utilizing the narrow band gain effect of the SBS, and at the same time, the vestigial sideband is suppressed by utilizing the attenuation effect of the SBS, so that thesideband suppression ratio is improved, and a large dynamic range of spectral measurement is realized.
Description
technical field [0001] The invention relates to a spectrum measurement method, in particular to a spectrum measurement method and device based on stimulated Brillouin scattering (stimulated Brillouin scattering, referred to as SBS) sideband shaping. Background technique [0002] With the rapid development of photonic technology, the continuous emergence of broadband services in recent years, the continuous improvement of service quality requirements, and the continuous exponential growth of access equipment have made optical fiber broadband networks a key development content. The development and application of dense wavelength division multiplexing technology (Dense Wavelength Division Multiplexing, DWDM) and other high-speed modulation technologies has become an inevitable trend. However, what follows is that the bandwidth of a single channel of the optical information system (or the granularity of spectrum reuse) is getting smaller and smaller, for example: ultra-dense wav...
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IPC IPC(8): G01J3/45G01J3/02
CPCG01J3/0262G01J3/0291G01J3/45
Inventor 薛敏朱贝贝陈维潘时龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS