High bandwidth tunable double-passband microwave photon filter

Abstract

The invention discloses a high bandwidth tunable double-passband microwave photon filter, belongs to the field of microwave photonics, and relates to the high bandwidth tunable double-passband microwave photon filter based on high non-linear optical fiber excited brillouin scattering effects and multiple pumping signals. The filter consists of a first laser, a first phase modulator, an opto-isolator, a vector network analyzer, a high non-linear optical fiber, a second laser, a strength modulator, a microwave signal source, a second phase regulator, a pulse code generator, an erbium-doped optical fiber amplifier, an optical circulator and a photoelectric detector. The filter is based on phase modulation and excited brillouin scattering effects caused by two pumping signals, and thus double-passband output of the microwave photon filter is achieved. By changing the frequency of the two pumping signals, the frequency of two passband centers can be randomly modulated within a certain frequency range. Through binary phase shift keying modulation on the pumping signals, the bandwidth of the pumping signals can be changed, and thus adjustment on the output bandwidth of the filter is achieved.

Description

technical field [0001] The invention belongs to the field of microwave photonics, and relates to a high-bandwidth tunable double-passband microwave photon filter based on highly nonlinear optical fiber stimulated Brillouin scattering effect, double pumping signals and binary phase-shift keying modulation technology. Background technique [0002] With the rapid development of wireless communication, radar and remote sensing technology, microwave frequency resources are becoming more and more scarce, and due to the diversification of communication modes, it will be difficult for single-band communication to meet the demand. Therefore, working in two or more frequency bands at the same time The communication system has become an important direction of wireless communication research. Wireless Local Area Network (WLAN) is because the original communication frequency band cannot meet the access needs of a large number of users. On the basis of the original communication protocol,...

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Problems solved by technology

[0003] Most of the current dual-passband microwave filters are filtered in the electrical domain. The two passbands of this filter are usually fixed, or one passband is fixed and the other passband is tuned within a narrow range. Therefore, the flexibility of this filter is poor and cannot meet the actual application requirements.

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