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Optical fiber laser using rare earth-added fiber and wide band light source

A fiber laser and rare earth-doped technology, which is applied in lasers, laser parts, phonon exciters, etc., can solve problems such as inappropriate application

Inactive Publication Date: 2007-04-18
FURUKAWA ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the reference (non-patent reference 3), a broadband light spanning 1100nm to 2200nm was obtained, but the ripple of about 15dB remained at the fine frequency of the nanometer order, so it was not suitable for the above-mentioned application, therefore, the aim was to reduce Small ripple in the generation of ultra-broadband light

Method used

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  • Optical fiber laser using rare earth-added fiber and wide band light source
  • Optical fiber laser using rare earth-added fiber and wide band light source
  • Optical fiber laser using rare earth-added fiber and wide band light source

Examples

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Effect test

no. 1 example

[0087] First, a first embodiment related to the present invention will be explained. Fig. 1 is a block diagram showing a fiber laser of a first embodiment. In the fiber laser with the structure shown in Figure 1, the dispersion-shifted fiber (DSF) 21, the single-mode fiber (SMF) 31, the erbium-doped fiber (EDF) 11, and Corning Flexcore 1060 (trademark) are arranged sequentially in the pulse propagation direction ) optical fiber 41, optical multiplexing (WDM) coupler 66, single-mode fiber (SMF) 32, dispersion-shifted fiber (DSF) 22, 1 / 4γ polarizer 61, 1 / 2γ polarizer 62, polarization beam splitter ( PBS) 63, isolator (ISO) 64, and 1 / 4 gamma polarizing plate 65, and a resonant cavity is formed in a ring that passes through these elements and returns to dispersion shifted fiber (DSF) 21.

[0088] The pumping light from the pumping light source 71 is combined with the Corning Flexcore 1060 optical fiber 41 through the WDM coupler 66, and pumps the erbium-doped fiber (EDF) 11 through...

no. 2 example

[0103] A second embodiment related to the present invention will be explained. Fig. 4 is a block diagram showing a fiber laser of a second embodiment. The structure of the resonant cavity of this fiber laser and the length of each optical fiber are the same as the structure of the resonant cavity of the above-mentioned first embodiment and the length of each optical fiber, and the noise-like pulse extracted through the output port 81 enters the high nonlinear optical fiber (HNL)51, to realize the supercontinuum generation experiment. The dispersion value of HNL fiber 51 at a wavelength of 1.55μm is -0.60ps 2 / Km, the zero dispersion wavelength is 1.532um, the nonlinear coefficient at 1.55um wavelength is 20 / W / km, and the fiber length is 1km.

[0104] Numerical simulations show that noise-like spectra involve supercontinuum of flat spectra. Not only the noise-like pulse but also the intensity waveform of the noise light has a minute structure as small as the inverse of the s...

no. 3 example

[0112] A third embodiment related to the present invention will be explained. Fig. 6 is a block diagram showing a fiber laser of a third embodiment. The structure of the cavity of the fiber laser and the length of each fiber are the same as those of the cavity of the first embodiment. The noise-like pulse extracted through the output port 81 of the first embodiment is input to the SMF 33, and its dispersion tolerance is checked.

[0113] Here, the length of SMF 33 is 1.6km and the amount of dispersion is -34ps 2 . Fig. 7 shows the autocorrelation waveform after 1.6km SMF 33 propagation. After the sub-picosecond Fourier transform-limited (TL) pulse propagates through the 1.6 km SMF, the short pulse component is not considered to persist. However, Figure 7 shows that short pulses still exist. It is clear that even if the input power to the SMF is changed, the soliton component does not propagate based on the fact that the same autocorrelation waveform is obtained.

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Abstract

Fiber laser comprising, provided in a resonator, an optical fiber having a normal dispersion, an optical fiber having an abnormal dispersion, a rare earth-added optical fiber as a gain medium, and mode synchronizing mechanism, characterized in that at least a rare earth-added optical fiber is included as an optical fiber having a normal dispersion, and the length of a rare earth-added fiber is set to be smaller than that of an optical fiber having an abnormal dispersion.

Description

technical field [0001] The invention relates to a fiber laser and a broadband light source using a rare earth-doped fiber. Background technique [0002] Pulsed light sources with broadband spectra and low coherence are expected to be applied in various fields, including optical topography and fiber optic sensing. Using light emitting diodes (LEDs) to generate pulses is one method of pulse generation. Low coherent light can be obtained by using amplification of spontaneous emission (ASE) generated from a fiber amplifier using an erbium-doped fiber (EDF) or the like as a light source. However, it is difficult to obtain high-intensity light for LEDs, and the bandwidth spectrum is also limited to the light-generating bandwidth of the fiber amplifier ASE light-dependent amplification medium. [0003] Here is an example of generating broad-spectrum optical pulses by a mode-locked fiber laser using an erbium-doped fiber (see Non-Patent Reference 1). Broadband oscillations (44 nm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/06H01S3/098H01S3/067
CPCH01S3/1112H01S3/06725H01S3/06712H01S3/06791
Inventor 相曾景一忠隈昌辉多久岛裕一
Owner FURUKAWA ELECTRIC CO LTD
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