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Swept source based on multi-rotating mirror and with adjustable initial wavelength and duty cycle

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

Active Publication Date: 2018-01-30
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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  • Swept source based on multi-rotating mirror and with adjustable initial wavelength and duty cycle
  • Swept source based on multi-rotating mirror and with adjustable initial wavelength and duty cycle
  • Swept source based on multi-rotating mirror and with adjustable initial wavelength and duty cycle

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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 discloses a swept source based on a multi-rotating mirror and with an adjustable initial wavelength and duty cycle and relates to the swept source optical coherence tomography technology. The swept source is characterized in that a signal generator 6 outputs a first signal and a second signal which are identical in period and different in duty cycle, a tunable filter drive module 7 is connected with the first signal and used for driving the multi-rotating mirror 10 in a tunable filter 3, and a current control module 5 is connected with the second signal and used for modulating the injection current waveform of a semiconductor optical amplifier 1. The swept source has the advantages that the time delay between the current control module 5 and the tunable filter drive module 7can be regulated by regulating the initial time delay, compared with the second signal, of the first signal, and accordingly, the initial wavelength of the output spectrum of the swept source can be changed; the injection current waveform of the semiconductor optical amplifier 1 is regulated by changing the first signal input to the current control module 5, and accordingly the spectrum output range of the semiconductor optical amplifier 1 is controlled, and the duty cycle of the swept source can be regulated finally.

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 Applications(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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