Rectangular Optical Filter System Based on Stimulated Brillouin Scattering Effect
A technology of stimulated Brillouin and scattering effects, applied in the field of optical fiber communication, can solve the problem of inability to obtain the transmission curve of the top flat filter, and achieve the effect of eliminating the measurement link, realizing broadband filtering, and changing the bandwidth.
Inactive Publication Date: 2015-12-23
SHANGHAI JIAO TONG UNIV
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Based on this consideration, the present invention provides a rectangular filter system based on the stimulated Brillouin scattering effect, and its purpose is to solve the defect that the existing optical filter technology cannot obtain a filter transmission curve with a flat top and a steep edge
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[0041] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0042] figure 1 Brillouin gain spectrum pumped for a single line. The stimulated Brillouin scattering effect is a threshold effect. When the input optical power exceeds the corresponding Brillouin threshold of the fiber, the SBS will transfer most of the input power to the backward Stokes wave. This effect can also be used to amplify signals whose frequency is equal to the Brillouin frequency shift relative to the pump frequency, where the pump wave and input signal must travel in opposite directions in a single-mode fiber.
[0043] The bandwidth of the Brillouin gain spectrum of a single spectral line is about 30MHz, which is not suitable for general filter application scenarios. In order to expand the bandwidth of the gain spectrum, multi-line pump gain spectrum superposition is required.
[0044] Figure 2 to Figure 5 For multispectral pumpi...
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Abstract
The invention discloses a rectangular optical filter system based on a stimulated brillouin scattering effect. An arbitrary waveform generator (AWG) is used for generating electric signals and controlling the amplitude of all frequency components of the electric signals so that the purpose of controlling the shape of pump light can be achieved, and lastly gain spectrum controllable in shape is obtained. Rectangular filter properties with flat top and sharp edges can be finally obtained by measuring the gain spectrum and carrying out feedback control. After the rectangular gain spectrum is obtained, a feedback mechanism completes tasks, and the system can be used for carrying out filtering on real signals. The bandwidth and the working wavelength of the rectangular optical filter are both adjustable, the bandwidth reaches the GHz magnitude, the problem that falling edge is not sharp when the bandwidth of a traditional passive optical filter is lower than 10 GHz is solved, and meanwhile the problem that the falling edge of other filters based on the stimulated brillouin scattering effect is not sharp enough or the bandwidth is too small is solved.
Description
technical field [0001] The invention relates to optical fiber communication, in particular to a rectangular optical filter system based on stimulated Brillouin scattering effect. Background technique [0002] In the demultiplexing of Orthogonal Frequency Division Multiplexing (OFDM) and microwave photonic signal processing, the crosstalk of adjacent channels will affect the quality of the signal. To reduce this crosstalk, a rectangular-like narrow-band optical filter with a flat top and steep edges is required. [0003] Some existing narrow-band optical filter technologies include cascaded Fabry-Perot cavities, commercial filters based on liquid crystals on silicon, and active filters based on SBS (stimulated Brillouin scattering effect), but There are certain problems in these technologies. [0004] For cascaded Fabry-Perot cavities: Fabry-Perot cavities can be used as an optical filter. By cascading, the edge steepness of the transmission curve can be improved. Found th...
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IPC IPC(8): G02F1/01H04B10/2537
Inventor 张严义理林魏伟毕美华李正璇尤伟志郑燃胡卫生
Owner SHANGHAI JIAO TONG UNIV