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Brillouin microwave photon filter bandwidth expansion method and system

A filter bandwidth, microwave photon technology, applied in electromagnetic wave transmission systems, transmission systems, electrical components, etc., to achieve the effects of waveform controllability, reduction of gain and saturated output power pressure, and expansion of the gain spectrum

Active Publication Date: 2022-02-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above patent documents are mainly aimed at generating bandwidth extension signals in the electrical domain, not at realizing the expansion of the bandwidth of Brillouin microwave photon filters.

Method used

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  • Brillouin microwave photon filter bandwidth expansion method and system
  • Brillouin microwave photon filter bandwidth expansion method and system
  • Brillouin microwave photon filter bandwidth expansion method and system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0048] This embodiment provides a method for expanding the bandwidth of a Brillouin microwave photonic filter, including the following steps:

[0049] Step 1: Multiple optical carriers with frequency differences are generated by multiple tunable light sources, and the multiple optical carriers are respectively used as the carriers of multiple Brillouin shunt pump light. The maximum frequency difference between different optical carriers is in the stimulated within the frequency shift of the Brillouin scattering effect.

[0050] Step 2: Multiple electrical signals with adjustable bandwidth and frequency generated by the signal source are respectively used as externally modulated driving electrical signals for multiple Brillouin shunt pump light broadening, and the bandwidth of each driving electrical signal is the same as that of the corresponding adjacent optical carrier The frequency difference is equal.

[0051] Step 3: Transform multiple electrical signals into multiple op...

Embodiment 2

[0067] The present invention also provides a Brillouin microwave photonic filter bandwidth extension system, including a first carrier suppression single sideband modulation module, a second carrier suppression single sideband modulation module, a first optical amplifier, a second optical amplifier, an optical coupling device, a first polarization controller, an optical circulator, a second polarization controller, an optical isolator, a narrowband optical filter module, an intensity modulator, a photodetector and a vector network analyzer. The input end of the first carrier suppression SSB modulation module, the input end of the second carrier suppression SSB modulation module and the first input end of the intensity modulator are all used to receive the output optical signal of the adjustable light source, and the first carrier suppression unit The sideband modulation module and the second carrier-suppressed single-sideband modulation module are used to generate a controllabl...

Embodiment 3

[0070] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1 and Embodiment 2.

[0071] This embodiment provides a method for expanding the bandwidth of a Brillouin microwave photonic filter, including the following steps:

[0072] S1: Multiple tunable light sources respectively generate optical carriers with a certain frequency difference, which are respectively used as carriers of multiple Brillouin shunt pump light; the maximum frequency difference between different optical carriers is at the frequency of the stimulated Brillouin scattering effect Within the shift amount, the frequency shift due to the stimulated Brillouin scattering effect is on the order of GHz. If the frequency difference between different optical carriers and the bandwidth of the modulated electrical signal are greater than the maximum frequency shift, the electro-optic modulated signal will produce alternating current. overlap, which leads to the overlap...

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Abstract

The invention provides a Brillouin microwave photon filter bandwidth expansion method and system, and the method comprises the following steps: generating a plurality of optical carriers which are respectively used as the carriers of a plurality of Brillouin shunt pump light; taking the plurality of electric signals as external modulation driving electric signals for broadening the plurality of Brillouin shunt pump light; converting the plurality of electric signals into a plurality of optical signals; combining multiple paths of pump light signals into one path through a coupler; outputting an electric signal within the frequency range of the Brillouin filter, and performing intensity modulation to obtain a sweep-frequency optical signal to be measured; S6, enabling the combined pump light signal to pass through a section of gain optical fiber to generate a Brillouin gain spectrum after bandwidth expansion, and carrying out amplification and filtering processing on the signal in a bandwidth range; detecting the electric signal when the pump light signal exists or not to obtain the waveform of the Brillouin microwave photon filter; and optimizing the waveform of the Brillouin microwave photon filter. According to the invention, the Brillouin microwave photon filter with adjustable bandwidth in a large range can be realized.

Description

technical field [0001] The invention relates to the technical field of Brillouin microwave photon filters, in particular to a method and system for extending the bandwidth of a Brillouin microwave photon filter. Background technique [0002] Microwave photonic filter is one of the essential components in the optical domain processing of modern microwave signals. The electrical signal is modulated into the optical domain through the electro-optic modulator. Using the characteristics of high optical frequency and wide bandwidth, optical devices are used to process the signal. After transmission or processing, it is converted into an electrical signal by a photodetector and detected at the output of the system to obtain a processed electrical signal. Compared with traditional filters, it has the advantages of high frequency, high efficiency, broadband, low loss, fast processing speed, flexible center frequency and bandwidth tunability, etc. It is widely used in radio fiber opti...

Claims

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Application Information

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IPC IPC(8): H04B10/516
CPCH04B10/5165
Inventor 石梦悦义理林吴章立
Owner SHANGHAI JIAO TONG UNIV
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