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Microwave photon filter construction capable of implementing negative coefficient

A filter structure, microwave photon technology, applied in the direction of optical fiber transmission, transmission system, optical waveguide coupling, etc., can solve the problems of resonance in the baseband, reduction of the range of the transfer function, poor filter sensitivity roll coefficient, etc. To achieve the effect of increasing the extinction ratio

Inactive Publication Date: 2009-05-20
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0010] (1) From the output waveform of the filter, it can be seen that the sensitivity of the filter decreases and the rolling coefficient is not good, thus reducing the range of the transfer function
[0011] (2) Resonance occurs in the baseband range

Method used

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  • Microwave photon filter construction capable of implementing negative coefficient
  • Microwave photon filter construction capable of implementing negative coefficient
  • Microwave photon filter construction capable of implementing negative coefficient

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Embodiment Construction

[0021] The specific embodiment of the microwave photonic filter structure based on semiconductor optical amplifier and fiber Bragg grating that can realize negative tap coefficient is that the optical signals of different wavelengths output by the adjustable light source 1 are respectively input into two semiconductor optical amplifiers 3, and the optical signals through the semiconductor optical Amplifier 3, the input radio frequency signal is loaded on the optical carrier, and the composite signal is then sent to the attenuator or amplifier 4, so that the phase is reversed, thereby realizing the function of the negative tap coefficient of the microwave photonic filter. The choice of attenuator or amplifier 4 is determined by the magnitude of the filter coefficients. Then, the converted optical signal is transmitted to the fiber Bragg grating pair 7, and higher performance is achieved by adjusting the reflection coefficients of the two fiber Bragg gratings 7 respectively. The...

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Abstract

The invention relates to a microwave photon filter structure which can achieve a negative coefficient and belongs to the field of high-capacity microwave photon communication. The structure consists of a tunable light source (1), a 3db beam splitter (2), a semiconductor amplifier SOA (3), an attenuator or an amplifier (4), a coupler (5), a circulator (6), a Bragg grating (7) and an optoelectronic detector (8). The microwave photon filter structure has the advantages that the characteristic of achieving the negative coefficient of the microwave photon filter is achieved, and finally a light signal passing through a photodiode is converted into a radio frequency signal so that the function of filtering the radio frequency signal in an optical domain is realized directly.

Description

technical field [0001] The invention belongs to the field of large-capacity microwave photon communication, in particular, it provides an adjustable microwave photon filter structure based on a semiconductor optical amplifier and a Bragg grating, which can realize negative coefficients, and especially relates to directly analyzing radio frequency domain signals in the all-optical field filtering. Background technique [0002] The current development of information technology has promoted the rapid development of microwave communication and optical fiber communication. Microwave communication can be launched in any direction, easy to build and reconfigure, and can realize the interconnection with mobile and handheld devices; it has low transmission cost (transmission through the atmosphere), and the use of cellular systems has efficient frequency utilization. However, microwave communication mainly faces the following two problems [0003] (1) The microwave transmission med...

Claims

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Application Information

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IPC IPC(8): H04B10/12G02B6/34H04B10/25
Inventor 王建萍刘娜周贤伟
Owner UNIV OF SCI & TECH BEIJING
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