Photonic microwave filter introducing infinite impulse response

A technology of infinite impulse response and microwave photons, applied to lasers, phonon exciters, laser components, etc., can solve the problems of increasing devices and limited number of taps

Inactive Publication Date: 2015-09-09
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

The number of taps of the finite impulse response filter is limited. To increase the number of taps, it is necessary to increase the number of devices

Method used

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  • Photonic microwave filter introducing infinite impulse response
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Embodiment Construction

[0016] See attached figure 1 , the present invention includes: multi-wavelength fiber laser 1, dual-drive Mach-Zehnder modulator 12, radio frequency signal generator 13, single-mode optical fiber B14, photodetector 15, radio frequency signal amplifier 16, radio frequency signal distributor 17, radio frequency signal analysis Instrument 18. Among them, the multi-wavelength fiber laser 1 includes a 980nm pump source 2, a wavelength division multiplexer 3, an erbium-doped fiber 4, an optical isolator 5, a polarization controller A6, a polarization-maintaining fiber A7, a polarization controller B8, and a polarization-maintaining fiber B9 , single mode fiber A10, coupler 11.

[0017] The connection relationship of the present invention is: the multi-wavelength laser produced by the multi-wavelength fiber laser 1 is output from the port where the output power of the coupler 11 accounts for 10%, and then enters the dual-drive Mach-Zehnder modulator 12, and is produced by the radio ...

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Abstract

The invention discloses a photonic microwave filter introducing infinite impulse response, and belongs to the technical field of photonic microwave filters. The photonic microwave filter is that a radio frequency signal converted by a photoelectric detector is inputted again into a double-drive mach-zehnder modulator on the basis of definite impulse response filter structure to form an electric feedback circulating loop, so as to introduce the infinite impulse response; after introducing the infinite impulse response, the frequency selecting property of the photonic microwave filter can be obviously improved, 3dB bandwidth is reduced, and the sequences main sidelobe inhibition ratio is increased; a multi-wavelength laser with tunable wavelength intervals is used as a light source of the filter; the wavelength intervals of outputted laser of a laser is adjusted, and thus the filter has different frequency spectral ranges.

Description

technical field [0001] The invention belongs to the technical field of microwave photon filters, in particular, an infinite impulse response filter is introduced on the basis of a finite impulse response filter, so that the microwave photon filter has better frequency selection characteristics. Background technique [0002] With the continuous development of microwave photonics, microwave photonic filters, one of its branches, have also been intensively studied. Microwave photonic filters process microwave signals in the optical domain, and have the advantages of wide bandwidth, low loss, and anti-electromagnetic interference, so they have been widely used. [0003] The light source is an important part of the microwave photonic filter, and other important characteristics of the filter can be realized by adjusting the output power of the light source, the number of wavelengths, and the wavelength interval. According to the number of taps generated by the light source in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01H01S3/067H01S3/10
CPCG02F1/0115H01S3/06741H01S3/10
Inventor 曹晔赵爱红童峥嵘
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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