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Arbitrary light-pulse generator based on optical Fourier transformation

A technology of Fourier transform and optical pulse, applied in optics, lasers, nonlinear optics, etc., can solve the problem of single optical pulse waveform

Inactive Publication Date: 2009-01-21
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to directly control the optical pulse in the time domain, so the waveform of the optical pulse obtained by people is relatively simple.

Method used

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  • Arbitrary light-pulse generator based on optical Fourier transformation
  • Arbitrary light-pulse generator based on optical Fourier transformation
  • Arbitrary light-pulse generator based on optical Fourier transformation

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Embodiment Construction

[0012] First, if figure 1 As shown, an ordinary pulsed laser 1, such as a Santec laser, is required to generate light pulses with a repetition frequency of 2.5 GHz and a pulse width of 30 ps. Generally speaking, the light pulses are Gaussian. If you want to get a square wave or triangular wave pulse, use the shape of the original pulse to make a difference with the square or triangle to get the required spectral characteristics of the filter. Based on this, filter 2 is selected to process the spectrum. According to different requirements, only the spectral characteristics of the filter need to be changed to obtain optical pulses with different spectrums. Since the fiber grating filter is relatively easy to design the shape of the filter, the optical filter can be composed of a circulator and a fiber grating, such as figure 2 As shown, the input end 31 of a common circulator 3 is connected to the pulsed laser, the two ports 32 of the circulator are connected to the fiber grat...

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Abstract

The invention discloses a free light pulse generator based on optical Fourier transform, belonging to the optical fiber communication technical field, wherein the output of a pulse laser (1) of the generator is connected with one end of an optical fiber (5) via an optical filter (2) and a photoelectric phase modulator (4), the another end of the optical fiber (5) outputs needed waveform light pulse, the optical fiber (2) is composed of a circulator (3) and an optical fiber grating (6) or is composed of a Fabry-perot chamber filter or a waveguide filter to filter the frequency spectrum of the initial light pulse to attain a demanded frequency spectrum shape, the pulse laser and the photoelectric phase module are driven by one clock signal, to work synchronously. The invention filters light pulse, adjusts the frequency spectrum into a demanded pulse shape and uses optical Fourier transform to transform the frequency spectrum of the light pulse into time domain to attain the light pulse of a corresponding waveform. The invention overcomes the defect of the prior art as single waveform of light pulses.

Description

technical field [0001] The invention relates to an arbitrary optical pulse generator based on optical Fourier transform, belonging to the technical field of optical fiber communication systems. Background technique [0002] Fiber-based ultrashort optical pulses are currently the most active research topic in the field of laser technology research, and have great application prospects. Ultrashort pulses have broad application prospects in the fields of communication, military, industrial processing, medicine, optical information processing, full-color display and laser printing. However, since the existing ultrashort laser pulses are mainly realized by active or passive mode-locked lasers, the means of shaping optical pulses in optical fibers mainly use optical switches, nonlinear effects and electro-optic modulators. Time Domain Control Method of Nonlinear Components. It is difficult to directly control the optical pulse in the time domain, so the waveform of the optical p...

Claims

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Application Information

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IPC IPC(8): G02F1/35H01S3/107G02B6/34
Inventor 谭中伟王燕花任文华陶配琳宁提纲刘艳裴丽简水生
Owner BEIJING JIAOTONG UNIV
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