A method and device for high-speed measurement of spatio-temporal spectral information of multi-mode optical pulse clusters
A technology of spectral information and optical pulses, applied in the field of ultrafast photonics, can solve problems such as limited application fields and not well explained
Inactive Publication Date: 2020-01-17
NANKAI UNIV
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Problems solved by technology
[0005] However, due to the limitation of detection technology, the physical mechanism of various nonlinear effects observed in multimode fiber has not been well explained, which also limits its application field.
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[0023] A specific implementation of the high-speed measurement device for multi-mode optical pulse cluster spatio-temporal spectral information is as follows: figure 1 As shown, it includes mode demultiplexer 2, adjustable optical attenuator 3, fiber delay line 4, fiber coupler 5, dispersion fiber 6, high-speed photoelectric detection system; said mode demultiplexer 2, adjustable optical attenuator 3, fiber delay line 4, fiber coupler 5, dispersive fiber 6, and high-speed photoelectric detection system are sequentially connected through optical fiber to realize mapping from space and frequency domain to time domain and high-speed data acquisition in time domain, wherein the The high-speed photodetection system consists of a high-speed photodetector 7 and a high-speed real-time oscilloscope 9 connected to it through a cable 8 . In this embodiment, the pulse cluster is set to have 3 fiber modes, but the method and device proposed by the present invention can study pulse clusters...
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The invention relates to a high-speed measurement method and device of space-time spectral information of a multi-mode optical pulse cluster. The method comprises a step of using a mode demultiplexer to convert light components of different optical fiber modes in the multi-mode optical pulse cluster into an optical fiber fundamental mode and decomposing the optical fiber fundamental mode into different single-mode optical fibers, a step of using an adjustable attenuator to carry out appropriate attenuation on light in each path of single-mode optical fiber, a step of coupling light into a single-mode optical fiber by using an optical fiber delay line and a coupler and mapping space mode information to a time domain, and a step of mapping information of spectrum to the time domain by using a dispersion optical fiber and carrying out detection by using a high-speed photoelectric detection system to realize the high-speed measurement of spectral information of each mode. The method and the device can be used for the research of an instantaneous pulse nonlinear effect in a multi-mode optical fiber ultra fast laser system.
Description
technical field [0001] The invention belongs to the field of ultrafast photonics, and in particular relates to a high-speed testing method for the space-time spectral characteristics of ultrafast light pulses in a multimode optical fiber system. Background technique [0002] Dispersive Fourier transformation (DFT) technology is a real-time and high-speed measurement method for the spectrum of ultrafast optical pulse clusters. This technology maps the spectral information of ultrashort optical pulse clusters to the time domain by introducing large group velocity dispersion, and detects its spectral information through high-speed single-point photodetectors and high-speed real-time oscilloscopes. Dispersive Fourier transform technology has played an important role in promoting the development of nonlinear scientific research and high-speed imaging. In terms of nonlinear scientific research, the use of dispersive Fourier transform technology can break through the limitations o...
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IPC IPC(8): G01J3/28
CPCG01J3/28
Inventor 王志王振洪刘艳格刘波张昊
Owner NANKAI UNIV