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A frequency-sweeping light source with adjustable initial wavelength and duty cycle based on a multi-faceted rotating mirror

A technology of starting wavelength and frequency-sweeping light source, which is applied in the field of frequency-sweeping light source, can solve problems such as increasing system cost and reducing system speed, and achieves the effect of increasing frequency-sweeping speed, realizing duty cycle, and stabilizing the output of starting wavelength

Active Publication Date: 2019-11-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods not only increase the cost of the system, but also reduce the speed of the system

Method used

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  • A frequency-sweeping light source with adjustable initial wavelength and duty cycle based on a multi-faceted rotating mirror
  • A frequency-sweeping light source with adjustable initial wavelength and duty cycle based on a multi-faceted rotating mirror
  • A frequency-sweeping light source with adjustable initial wavelength and duty cycle based on a multi-faceted rotating mirror

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing and example the present invention will be further described:

[0020] figure 1 Shown is a structural diagram of a frequency-sweeping light source with adjustable initial wavelength and duty cycle based on a polygonal mirror proposed by the present invention, including a semiconductor optical amplifier (semiconductor optical amplifier, SOA) 1, a polarization controller 2, a coupling 3 and tunable filter 4, the light emitted by the semiconductor optical amplifier 1 after stimulated radiation passes through the polarization controller 2 and then enters the coupler 3, the light passing through the coupler 3 is divided into two paths, and one path enters the tunable filter 4 , the other is output through the output terminal 8; the sweeping light source also includes a current control module 5, a signal generator 6 and a tunable filter driving module 7, and the signal generator 6 is used to generate the first signal with the same...

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Abstract

The invention relates to a frequency-sweeping light source with adjustable starting wavelength and duty ratio based on a multi-faceted rotating mirror, which relates to coherent tomography technology of the frequency-sweeping source light source. The signal generator (6) outputs the first signal and the second signal with the same period but different duty ratios in two columns, and the tunable filter driving module (7) is connected to the first signal for driving the tunable filter (3) The polygon mirror (10), the current control module (5) is connected to the second signal for modulating the injection current waveform of the semiconductor optical amplifier (1). By adjusting the initial delay of the first signal compared to the second signal, the delay between the current control module (5) and the tunable filter drive module (7) can be adjusted to change the initial output spectrum of the frequency-sweeping light source Wavelength; by changing the first signal input to the current control module (5) to adjust the waveform of the injection current of the semiconductor optical amplifier (1), thereby controlling the spectral output range of the semiconductor optical amplifier (1), and achieving the purpose of adjusting the duty cycle of the light source.

Description

technical field [0001] The invention relates to coherent tomographic imaging technology of a frequency-sweeping source light source, in particular to a frequency-sweeping light source based on a multi-faceted rotating mirror with adjustable initial wavelength and duty cycle. Background technique [0002] Optical coherence tomography (OCT) technology is a high-resolution biomedical imaging method, which can perform two-dimensional cross-section and three-dimensional imaging of biological tissue structure by measuring the backscattered light of biological tissue, because of its Non-invasive, non-contact, capable of in vivo imaging, real-time imaging and high resolution, OCT has gradually been widely used in many fields and has a good development prospect. The development of OCT technology has experienced from the first generation of time domain OCT to the second generation of Fourier domain OCT, and Fourier domain OCT can be divided into two types: spectral domain OCT and freq...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/01G01N21/47
Inventor 汪平河常俊利史国华
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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