阅读说明：本技术 通阻带可切换的射频光子滤波器 (Radio frequency photon filter with switchable pass-stop band ) 是由 董小伟 于 2019-10-18 设计创作，主要内容包括：一种通阻带可切换的射频光子滤波器,适用于射频光子领域。该器件包括：分布反馈布拉格激光器(1)、第一光偏振控制器(21)、第二光偏振控制器(22)、光相位调制器(3)、1×2光耦合器(4)、光隔离器(5)、单模光纤(6)、光环形器(7)、光强度调制器(9)、射频信号发生器(10)、掺铒光纤放大器(11)、光带通滤波器(12)、光电探测器(13)、光网络分析仪(14)。(A radio frequency photon filter with switchable pass-stop bands is suitable for the field of radio frequency photons. The device includes: the optical fiber laser comprises a distributed feedback Bragg laser (1), a first optical polarization controller (21), a second optical polarization controller (22), an optical phase modulator (3), a 1 x 2 optical coupler (4), an optical isolator (5), a single-mode optical fiber (6), an optical circulator (7), an optical intensity modulator (9), a radio frequency signal generator (10), an erbium-doped optical fiber amplifier (11), an optical bandpass filter (12), a photoelectric detector (13) and an optical network analyzer (14).)

1. A radio frequency photonic filter switchable between a pass band and a stop band, comprising: the radio frequency photon filter comprises a distributed feedback Bragg laser (1), a first light polarization controller (21), a second light polarization controller (22), an optical phase modulator (3), a 1 x 2 optical coupler (4), an optical isolator (5), an optical phase shift modulator (6), a single mode fiber (7), an optical circulator (8), a light intensity modulator (9), a radio frequency signal generator (10), an erbium-doped fiber amplifier (11), an optical bandpass filter (12), a photoelectric detector (13) and an optical network analyzer (14).

2. The connections of the devices are as follows:

the output port of the distributed feedback Bragg laser (1) is connected with the input port of a first optical polarization controller (21), the output port of the first optical polarization controller (21) is connected with the optical input port of an optical phase modulator (3), the optical output port of the optical phase modulator (3) is connected with the first port of a 1 x 2 optical coupler (4), the electrical input port of the optical phase modulator (3) is connected with the output port of an optical network analyzer (14), the second port of the 1 x 2 optical coupler (4) is connected with the input port of an optical isolator (5), the output port of the optical isolator (5) is connected with the input port of an optical phase shift modulator (6), the output port of the optical phase shift modulator (6) is connected with one end of a single-mode fiber (7), the other end of the single-mode fiber (7) is connected with the second port of an optical circulator (8), the third port of the 1 x 2 optical coupler (4) is connected with the input port of a second optical polarization controller (22), an output port of the second optical polarization controller (22) is connected with an optical input port of the optical intensity modulator (9), an optical output port of the optical intensity modulator (9) is connected with an input port of the erbium-doped fiber amplifier (11), an electrical input port of the optical intensity modulator (9) is connected with an output port of the radio frequency signal generator (10), an output port of the erbium-doped fiber amplifier (11) is connected with an input port of the optical band-pass filter (12), an output port of the optical band-pass filter (12) is connected with a first port of the optical circulator (8), a third port of the optical circulator (8) is connected with an input port of the photoelectric detector (13), and an output port of the photoelectric detector (13) is connected with an input port of the optical network analyzer (14).

3. The switchable radio frequency photonic filter of claim 1, wherein the 1 x 2 optical coupler (4) has a power splitting ratio of 2:8 between the second port and the third port.

Technical Field

The invention relates to the field of radio frequency photons, in particular to a radio frequency photon filter with switchable pass-stop bands.

Background

The demand for high-speed and large-capacity radio frequency signals in the fields of sonar, radar, mobile communication, data images and the like is increasing day by day, along with the development of radio frequency signal multiplexing technology, the effective separation and extraction of each high-speed multiplexed radio frequency signal at a receiving end become more and more difficult, and a high-performance radio frequency signal filter is a key for restricting the development of the fields related to radio frequency signal extraction. Although various band-pass or band-stop radio frequency signal filters with independent functions are developed by using an electrical method at present, filtering noise interference is more and more serious along with the increase of radio frequency signal frequency, and each node of a system carries out filtering processing on multiplexed multi-channel signals, so that a large number of band-pass and band-stop filters are required, and the cost is huge. Photons have low noise, large capacity, parallel processing capability, and provide an effective solution for obtaining a better performance of the radio frequency filter.

Disclosure of Invention

The invention aims to overcome the defects of performance and cost exposure of the conventional radio frequency photon filter and discloses a radio frequency photon filter with switchable pass-stop bands.

The technical scheme of the invention is as follows:

a radio frequency photonic filter switchable by a pass-stop band, comprising: the optical fiber laser comprises a distributed feedback Bragg laser, a first optical polarization controller, a second optical polarization controller, an optical phase modulator, a 1 multiplied by 2 optical coupler, an optical isolator, an optical phase shift modulator, a single-mode optical fiber, an optical circulator, a light intensity modulator, a radio frequency signal generator, an erbium-doped optical fiber amplifier, a light band-pass filter, a photoelectric detector and an optical network analyzer. The connections of the devices are as follows:

the output port of the distributed feedback Bragg laser is connected with the input port of the first optical polarization controller, the output port of the first optical polarization controller is connected with the optical input port of the optical phase modulator, the optical output port of the optical phase modulator is connected with the first port of the 1 x 2 optical coupler, the electrical input port of the optical phase modulator is connected with the output port of the optical network analyzer, the second port of the 1 x 2 optical coupler is connected with the input port of the optical isolator, the output port of the optical isolator is connected with the input port of the optical phase shift modulator, the output port of the optical phase shift modulator is connected with one end of the single-mode optical fiber, the other end of the single-mode optical fiber is connected with the second port of the optical circulator, the third port of the 1 x 2 optical coupler is connected with the input port of the second optical polarization controller, and the output port of the second optical polarization controller is connected, the optical output port of the optical intensity modulator is connected with the input port of the erbium-doped optical fiber amplifier, the electrical input port of the optical intensity modulator is connected with the output port of the radio-frequency signal generator, the output port of the erbium-doped optical fiber amplifier is connected with the input port of the optical band-pass filter, the output port of the optical band-pass filter is connected with the first port of the optical circulator, the third port of the optical circulator is connected with the input port of the photoelectric detector, and the output port of the photoelectric detector is connected with the input port of the optical network analyzer.

The working mode of the invention is as follows:

the invention discloses a radio frequency photon filter with switchable pass-stop bands, which generates multiple harmonics by utilizing light phase modulation, after beam splitting by a 1 x 2 optical coupler, a branch harmonic signal with lower power is subjected to phase shift regulation by a light phase shift regulator, a branch signal with higher power passes through a light intensity modulator and is subjected to output signal frequency control of a radio frequency signal generator and power control of an erbium-doped fiber amplifier, and then a stimulated Brillouin scattering effect is generated in a single mode fiber, so that harmonic selection of the branch signal with lower power is formed. According to the difference of the phase shift of the light phase shift controller to the harmonic wave of the branch with smaller power, the gain passband or loss stopband effect of stimulated Brillouin scattering can be obtained in the single-mode optical fiber, and therefore the passband or stopband switching of radio-frequency signals is achieved.

Drawings

Fig. 1 is a block diagram of a radio frequency photonic filter with switchable pass-stop bands.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, a radio frequency photonic filter with switchable pass-stop band, includes: the distributed feedback Bragg laser comprises a distributed feedback Bragg laser 1, a first optical polarization controller 21, a second optical polarization controller 22, an optical phase modulator 3, a 1 x 2 optical coupler 4, an optical isolator 5, an optical phase shift modulator 6, a single-mode fiber 7, an optical circulator 8, a light intensity modulator 9, a radio frequency signal generator 10, an erbium-doped fiber amplifier 11, an optical bandpass filter 12, a photoelectric detector 13 and an optical network analyzer 14. The connections of the devices are as follows:

the output port of the distributed feedback bragg laser 1 is connected with the input port of the first optical polarization controller 21, the output port of the first optical polarization controller 21 is connected with the optical input port of the optical phase modulator 3, the optical output port of the optical phase modulator 3 is connected with the first port of the 1 × 2 optical coupler 4, the electrical input port of the optical phase modulator 3 is connected with the output port of the optical network analyzer 14, the second port of the 1 × 2 optical coupler 4 is connected with the input port of the optical isolator 5, the output port of the optical isolator 5 is connected with the input port of the optical phase shift modulator 6, the output port of the optical phase shift modulator 6 is connected with one end of the single-mode optical fiber 7, the other end of the single-mode optical fiber 7 is connected with the second port of the optical circulator 8, the third port of the 1 × 2 optical coupler 4 is connected with the input port of the second optical polarization controller 22, the output port of the second optical polarization controller 22 is connected with the, an optical output port of the optical intensity modulator 9 is connected with an input port of the erbium-doped optical fiber amplifier 11, an electrical input port of the optical intensity modulator 9 is connected with an output port of the radio frequency signal generator 10, an output port of the erbium-doped optical fiber amplifier 11 is connected with an input port of the optical bandpass filter 12, an output port of the optical bandpass filter 12 is connected with a first port of the optical circulator 8, a third port of the optical circulator 8 is connected with an input port of the photoelectric detector 13, and an output port of the photoelectric detector 13 is connected with an input port of the optical network analyzer 14.