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Frequency synthesizer and frequency synthesis method based on optical beat technique

A frequency synthesizer and optical beat technology, applied in the field of modern communication systems, can solve the problems of resolution frequency conversion time limitation, large size of frequency synthesizer, narrow working frequency band, etc. wide effect

Inactive Publication Date: 2009-10-07
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Application Information

AI Technical Summary

Problems solved by technology

The frequency synthesizer using this method is large in size, high in cost and complex in structure
The indirect frequency synthesis technology uses a phase-locked loop to achieve frequency synthesis, and its disadvantage is that the resolution is limited by the frequency conversion time
Direct digital frequency synthesis is a signal synthesis technology that converts a series of digital signals into analog form through a digital / analog converter. Its disadvantage is that the operating frequency band is narrow, usually below 30MHz to 300MHz

Method used

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  • Frequency synthesizer and frequency synthesis method based on optical beat technique
  • Frequency synthesizer and frequency synthesis method based on optical beat technique
  • Frequency synthesizer and frequency synthesis method based on optical beat technique

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Embodiment

[0029] Embodiment: a kind of frequency synthesizer and frequency synthesis method based on optical beat technology (see figure 1 ), the connection mode of the components is: the input port of the fiber laser (1) is connected to the input port of the photodetector (2), and the output port of the photodetector (2) is connected to the tunable bandpass filter (3) .

[0030] The fiber laser (1) mentioned above is a ring-cavity multi-longitudinal-mode fiber laser.

[0031] The above-mentioned cut-off frequency of the photodetector (2) is higher than the highest operating frequency of the frequency synthesizer, which is 10 GHz.

[0032] The tunable bandpass filter (3) mentioned above is a filter bank, and the tuning range should cover the entire working frequency band of the frequency synthesizer, and the 3dB bandwidth of each filter is less than the longitudinal mode interval, which is 8MHz.

[0033] The above-mentioned fiber laser (1) is a ring cavity erbium-doped fiber laser, wh...

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Abstract

The present invention relates to a frequency synthesizer and frequency synthesis method based on optical beat technique. The frequency synthesizer mainly comprises an optical fiber laser, a photoelectric detector and a tunable band-pass filter which are sequentially connected and forms frequency synthesis. The present invention generates a series of sinusoidal wave electrical signals with same frequency interval through inputting multilongitudinal-mode laser output by the optical fiber laser to the photoelectric detector and generating beat by laser longitudinal mode in the photoelectric detector. Then the electrical signal of a certain frequency is selected through adjusting the tunable band-pass filter. As the number of laser longitudinal mode is large, the frequency range of electrical signal generated by the longitudinal mode beat is extraordinary wide, and can be changed from megahertz to hundreds of GigaHertz. The frequency synthesizer of the invention has the characteristics of small volume, simple structure, convenient method and wide operating frequency band. The frequency synthesizer and frequency synthesis method belong to the field of modern communication system and instrument measuring.

Description

(1) Technical field: [0001] The invention relates to modern communication systems and the field of instrumentation measurement, in particular to a frequency synthesizer and a frequency synthesis method based on optical beat technology, which are mainly used as signal sources in modern communication systems, radar, instrumentation measurement and other fields. (two) background technology: [0002] Frequency synthesizers are widely used in the fields of radio communication systems and instrumentation measurement. For example, in a transceiver of a wireless communication system, the main task of a frequency synthesizer is to generate a frequency-transformed local oscillator signal. At present, there are direct frequency synthesis, indirect frequency synthesis and direct digital frequency synthesis methods based on electrical methods to realize frequency synthesis. Direct frequency synthesis is to use one or several reference frequency sources to generate a series of harmonics ...

Claims

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Application Information

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IPC IPC(8): G02F2/00H01S3/067
Inventor 马秀荣冀青孙静
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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