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Tunable microwave photon band pass filter based on multi-wavelength fiber laser

A fiber laser and band-pass filter technology, which is applied in the coupling of optical waveguides, instruments, optics, etc., can solve the problems of multi-system noise, high cost, and reduced filter performance, and achieve band-pass filtering with low cost , the effect of large side lobe suppression ratio

Inactive Publication Date: 2011-11-23
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

The realization of microwave photonic filters often requires the use of laser arrays or the use of spectral cutting broadband light sources, and the former is very costly, while the latter reduces the cost but reduces the performance of the filter due to the introduction of excessive system noise

Method used

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  • Tunable microwave photon band pass filter based on multi-wavelength fiber laser
  • Tunable microwave photon band pass filter based on multi-wavelength fiber laser

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Embodiment 1

[0018] This highly tunable microwave photonic bandpass filter structure includes: 980nm or 1480nm pump source 1, wavelength division multiplexer 2, erbium-doped fiber 3, polarization controller-4, polarization-dependent isolator 5, polarization control Polarization controller two 6, polarization controller three 8 and polarization controller four 12, polarization maintaining fiber one 7, polarization maintaining fiber two 9 and polarization maintaining fiber three 13, common single-mode fiber one 10 and common single-mode fiber two 17, coupler One 11, coupler two 14, phase modulator 15 and photodetector 16.

[0019] A pump source 1 with a center wavelength of 980nm or 1480nm is connected to port a of the wavelength division multiplexer 2; port c of the wavelength division multiplexer 2 is connected to the input end of the erbium-doped fiber 3; the output end of the erbium-doped fiber 3 is connected to the polarization controller The input end of one 4; the output end of the po...

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Abstract

The invention discloses a tunable microwave photon band pass filter based on a multi-wavelength fiber laser, belonging to the technical field of fiber-optical communication and signal processing. The tunable microwave photon band pass filter is structurally characterized in that: the output end of a pump source is connected with a port a of a wavelength division multiplexer; a port c of the wavelength division multiplexer is connected with the input end of an erbium-doped fiber; a port b of the wavelength division multiplexer is connected with a port b of a coupler I; a port a of the coupler I is connected with an ordinary single mode fiber; the port b and a port c of the coupler I are connected with a port a of the wavelength division multiplexer and a port a of a coupler II respectively; etc. Based on the multi-wavelength fiber laser, the tunable microwave photon band pass filter can be used for apodization by utilizing a birefringence fiber environment, and then realizes high side lobe suppression ratio by utilizing phase strength conversion (PM-IM). Compared with other microwave photon filters, the tunable microwave photon band pass filter has the advantages of simple structure, low cost, capability of realizing band pass filtration and higher side lobe suppression ratio, tunable band pass, capability of working stably at normal temperature, and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication and signal processing, and in particular relates to optical processing of radio frequency signals. Background technique [0002] Microwave photonic filter is a research hotspot in the field of microwave photonics. Generally speaking, microwave photonic filters can be realized in two ways: one is coherent way; the other is non-coherent way. Because the optical phase is easily affected by the surrounding environment, and it is difficult to control, the current microwave photonic signal processing is generally implemented in an incoherent manner. There is a linear relationship between the output of the non-coherent filter and the input radio frequency signal, and is not affected by the disturbance of the optical phase by the surrounding environment. However, the incoherent filtering system is the superposition of the light intensity of the signal, and the tap coefficient of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/27G02B6/293H04B10/12
Inventor 杨秀峰彭磊童峥嵘曹晔
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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