CN217132528U - Doped optical fiber fluorescence life measuring device - Google Patents
Doped optical fiber fluorescence life measuring device Download PDFInfo
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- CN217132528U CN217132528U CN202220407377.9U CN202220407377U CN217132528U CN 217132528 U CN217132528 U CN 217132528U CN 202220407377 U CN202220407377 U CN 202220407377U CN 217132528 U CN217132528 U CN 217132528U
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Abstract
The utility model provides a doping optic fibre fluorescence life-span measuring device, include: the output end of the signal generator is connected with the input end of the pump laser and is used for generating pulse pump laser; the output end of the pump laser is connected with the pump end of the wavelength division multiplexer and used for sending the pulse pump laser to the wavelength division multiplexer; the output end of the wavelength division multiplexer is connected with one end of the doped optical fiber and is used for carrying out wavelength division multiplexing on the pulse pumping laser and sending the pulse pumping laser subjected to wavelength division multiplexing to the doped optical fiber so as to excite the doped optical fiber and generate a fluorescent signal; the input end of the photoelectric detector is connected with the other end of the doped optical fiber and is used for converting the fluorescent signal into an electric signal; the input end of the oscilloscope is connected with the output end of the photoelectric detector and is used for displaying the attenuation change of the electric signal along with time so as to obtain the fluorescence life of the doped optical fiber to be detected. The utility model discloses directly carry out fluorescence life-span to doping optic fibre and detect, more accurate and measure the fluorescence life-span of doping optic fibre fast.
Description
Technical Field
The utility model relates to an optical fiber test technical field especially relates to a doping optic fibre fluorescence life-span measuring device.
Background
The fluorescence lifetime is the time taken for the fluorescence intensity to fall to 1/e of the original intensity after the laser excitation is stopped. When the doped optical fiber is excited, the particles in the ground state can absorb energy and jump to the excited state, after the excitation is stopped, the particles in the excited state are more, the emitted fluorescence is stronger, and the luminous intensity is weaker and weaker along with the lapse of time.
When analyzing and designing a fiber laser system, the fluorescence lifetime has a great influence on fiber lasers, fiber amplifiers and the like, and the important performance parameter of accurately measuring the fluorescence lifetime of doped fibers is needed. At present, the fluorescence lifetime of a doped optical fiber is generally measured by performing fluorescence laser on a slice of an optical fiber preform, so that the obtained fluorescence lifetime is only the fluorescence lifetime of the doped optical rod, but not the fluorescence lifetime of the doped optical fiber, and the measurement accuracy is low; in addition, the fiber core size of the existing doped fiber is micron-scale, and the fiber core is inconvenient to slice.
Therefore, there is a need for a doped fiber fluorescence lifetime measurement device to solve the above problems.
SUMMERY OF THE UTILITY MODEL
To the problems existing in the prior art, the utility model provides a doped fiber fluorescence life-span measuring device.
The utility model provides a doping optic fibre fluorescence life-span measuring device, including signal generator, pumping laser, wavelength division multiplexer, the doping optic fibre that awaits measuring, photoelectric detector and oscilloscope, wherein:
the output end of the signal generator is connected with the input end of the pump laser and is used for carrying out square wave modulation on the pump laser to generate pulse pump laser;
the output end of the pump laser is connected with the pump end of the wavelength division multiplexer and used for sending the pulse pump laser to the wavelength division multiplexer;
the output end of the wavelength division multiplexer is connected with one end of the doped optical fiber to be detected and is used for carrying out wavelength division multiplexing on the pulse pumping laser and sending the pulse pumping laser subjected to wavelength division multiplexing to the doped optical fiber to be detected so as to excite the doped optical fiber to be detected and generate a fluorescence signal;
the input end of the photoelectric detector is connected with the other end of the doped optical fiber to be detected and used for converting the fluorescence signal into an electric signal;
and the input end of the oscilloscope is connected with the output end of the photoelectric detector and is used for displaying the attenuation change of the electric signal along with time so as to obtain the fluorescence life of the doped optical fiber to be detected.
According to the utility model provides a pair of doping optic fibre fluorescence life-span measuring device, the device still includes optical isolator, optical isolator's input is connected pumping laser's output, optical isolator's output is connected wavelength division multiplexer's pumping end.
According to the utility model provides a pair of doped fiber fluorescence life measuring device, the output wavelength of pump laser is according to the doping medium of the doped fiber that awaits measuring confirms, wherein, if the doped fiber that awaits measuring is when doping ytterbium fiber, the output wavelength of pump laser is 976 ± 5 nm; if the doped optical fiber to be detected is the thulium-doped optical fiber, the output wavelength of the pump laser is 793 +/-5 nm; and if the doped fiber to be detected is erbium-doped fiber or erbium-ytterbium co-doped fiber, the output wavelength of the pump laser is 980 +/-5 nm.
According to the utility model provides a pair of doped fiber fluorescence life-span measuring device, wavelength division multiplexer's operating wavelength is according to the doping medium of the doped fiber that awaits measuring confirms, wherein, if the doped fiber that awaits measuring is when doping ytterbium fiber, wavelength division multiplexer is 976nm and 1064nm operating wavelength's dual band fiber wavelength division multiplexer; if the doped optical fiber to be detected is the thulium-doped optical fiber, the wavelength division multiplexer is a dual-band optical fiber wavelength division multiplexer with working wavelengths of 793nm and 1940 nm; and if the doped optical fiber to be detected is the erbium-doped optical fiber, the wavelength division multiplexer is a dual-band optical fiber wavelength division multiplexer with working wavelengths of 980nm and 1550 nm.
According to the utility model provides a pair of doping optic fibre fluorescence life-span measuring device, the falling edge time of pulse pumping laser is less than 10 mus, and repetition frequency less than or equal to 10Hz, pulse width less than or equal to 10 ms.
According to the utility model provides a pair of doping optic fibre fluorescence life-span measuring device, photoelectric detector's detection wavelength range is 200nm to 2400 nm.
According to the utility model provides a pair of doping optic fibre fluorescence life-span measuring device, oscilloscope's bandwidth more than or equal to 400 Mhz.
According to the utility model provides a pair of doping optic fibre fluorescence life-span measuring device, the optical isolator is tail optical fiber type optical isolator, and isolation more than or equal to 22 dB.
According to the utility model provides a pair of doping optic fibre fluorescence life-span measuring device, the doping optic fibre that awaits measuring is for doping the tombarthite element optic fibre.
The utility model provides a pair of mix optic fibre fluorescence life-span measuring device, to the lower problem of the fluorescence life-span measuring result accuracy of mixing optic fibre among the prior art, through the fluorescence life-span measuring device who founds an all-fiber formula structure, directly carry out fluorescence life-span to mixing optic fibre and detect to more accurate and measure the fluorescence life-span of mixing optic fibre fast.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a doped fiber fluorescence lifetime measuring apparatus provided by the present invention;
reference numerals:
101: a signal generator; 102: a pump laser; 103: a wavelength division multiplexer; 104: a photodetector; 105: an oscilloscope; 106: doping optical fibers to be detected; 107: an optical isolator.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the existing fluorescence life measuring technology of doped optical fiber, a spatial light path mode is mainly adopted to excite and measure a fiber core doped region, a measuring device in the technology is of a free space structure, a pump source needs to be converged through a focusing lens, the problems of complex structure, unstable fluorescence signals and the like exist, a sample fiber core is generally in the magnitude of several microns to dozens of microns, the excitation into the fiber core is difficult to ensure, the generated fluorescence intensity is weak, the signal-to-noise ratio is poor, and the fluorescence life cannot be accurately obtained. Therefore, at present, no reliable measuring device exists for the fluorescence lifetime testing technology of the doped optical fiber. In order to improve the doping concentration of doping optic fibre effectively, accurate and rapid survey fluorescence life-span becomes the important link of design and preparation fiber laser and amplifier, does not have comparatively accurate measuring doping optic fibre fluorescence life-span among the prior art, the utility model provides a doping optic fibre fluorescence life-span measuring device.
Fig. 1 is the utility model provides a doping optic fibre fluorescence life-span measuring device's structural schematic diagram, as shown in fig. 1, the utility model provides a doping optic fibre fluorescence life-span measuring device, including signal generator 101, pump laser 102, wavelength division multiplexer 103, photoelectric detector 104, oscilloscope 105, the doping optic fibre 106 and the optical isolator 107 that awaits measuring, wherein:
the output end of the signal generator 101 is connected to the input end of the pump laser 102, and is configured to perform square wave modulation on the pump laser 102 to generate pulse pump laser;
the output end of the pump laser 102 is connected to the pump end of the wavelength division multiplexer 103, and is used for sending the pulse pump laser to the wavelength division multiplexer 103;
the output end of the wavelength division multiplexer 103 is connected to one end of the doped fiber 106 to be detected, and is configured to perform wavelength division multiplexing on the pulse pumping laser, and send the pulse pumping laser after wavelength division multiplexing to the doped fiber 106 to be detected, so as to excite the doped fiber 106 to be detected, and generate a fluorescence signal.
In the present invention, the signal generator 101 modulates the pump laser 102 by sending a square wave signal to the pump laser 102, so that the pump laser 102 generates a pulsed pump laser. Further, the pump laser 102 sends the generated pulsed pump laser to the wavelength division multiplexer 103.
Preferably, the doped fiber fluorescence lifetime measuring device further comprises an optical isolator 107, as shown in fig. 1, wherein an input end of the optical isolator 107 is connected to an output end of the pump laser 102, and an output end of the optical isolator 107 is connected to a pump end of the wavelength division multiplexer 103. Through optical isolator 107, with the pumping end of pulse pump signal (being pulse pump laser) input to wavelength division multiplexer 103 to the direction of focusing limits for light can only the unidirectional transmission, and the light through doping optical fiber echo reflection can be by the fine isolation of optical isolator 107, thereby improves light wave transmission efficiency.
The input end of the photodetector 104 is connected to the other end of the doped fiber 106 to be detected, and is configured to convert the fluorescence signal into an electrical signal.
The input end of the oscilloscope 105 is connected to the output end of the photodetector 104, and is configured to display the attenuation change of the electrical signal with time, so as to obtain the fluorescence lifetime of the doped optical fiber 106 to be measured.
In the present invention, after the pulse pumping laser is wavelength division multiplexed by the wavelength division multiplexer 103, the pulse pumping laser is inputted to one end of the doped fiber 106 to be tested, so as to excite the doped fiber 106 to be tested, thereby generating a fluorescence signal; further, the other end of the doped optical fiber 106 to be detected is connected to the photodetector 104, so that the fluorescent signal is converted into an electrical signal by the photodetector 104, and finally the electrical signal is sent to the oscilloscope 105 by the photodetector 104. The utility model discloses in, show the decay change of signal of telecommunication along with time through oscilloscope 105 to detect fluorescence signal, and then obtain the fluorescence life-span of doping optic fibre, wherein, in oscilloscope 105's display module, the cross axle is time parameter, and the axis of ordinates is amplitude parameter.
The utility model discloses in, connect through the control line between signal generator 101 and the pump laser 102, through fiber connection between pump laser 102, optical isolator 107 and the wavelength division multiplexer 103, through cable conductor connection between photoelectric detector 105 and the oscilloscope 105, wherein, the optic fibre of optical fiber for awaiting measuring between wavelength division multiplexer 103 and the photoelectric detector 104 mixes optic fibre. The utility model discloses an adopt full fiber formula structure to establish and dope optic fibre fluorescence life-span measuring device, have simple structure, fluorescence signal stability is higher, and the interference killing feature is strong and effect such as measuring accuracy height is suitable for the fluorescence life-span test of different kinds of tombarthite doping optic fibre.
The utility model provides a doping optic fibre fluorescence life-span measuring device, to the lower problem of the fluorescence life-span measuring result accuracy of doping optic fibre among the prior art, through constructing the fluorescence life-span measuring device of an all-fiber formula structure, directly carry out fluorescence life-span to doping optic fibre and detect to more accurate and measure the fluorescence life-span of doping optic fibre fast.
On the basis of the above embodiment, the doped optical fiber to be measured is a rare earth element doped optical fiber. Specifically, the rare earth element in the doped optical fiber to be measured may be one or more element dopants of ytterbium, thulium, erbium, or holmium, and the like. Based on the doped fibers corresponding to different rare earth elements, pump lasers 102 and wavelength division multiplexers 103 of different models are selected.
On the basis of the above embodiment, the output wavelength of the pump laser 102 is determined according to the doping medium of the doped fiber 106 to be tested, wherein if the doped fiber 106 to be tested is an ytterbium-doped fiber, the output wavelength of the pump laser 102 is 976 ± 5nm, that is, the output wavelength of the pump laser is 971nm to 981 nm; if the doped fiber 106 to be detected is a thulium-doped fiber, the output wavelength of the pump laser 102 is 793 ± 5nm, that is, the output wavelength of the pump laser is 788nm to 798 nm; if the doped fiber 106 to be measured is erbium-doped fiber or erbium-ytterbium co-doped fiber, the output wavelength of the pump laser 102 is 980 ± 5nm, that is, the output wavelength of the pump laser is 975nm to 985 nm.
On the basis of the above embodiment, the operating wavelength of the wavelength division multiplexer 103 is determined according to the doping medium of the doped optical fiber 106 to be tested, wherein if the doped optical fiber 106 to be tested is an ytterbium-doped optical fiber, the wavelength division multiplexer 103 is a dual-band optical fiber wavelength division multiplexer with operating wavelengths of 976nm and 1064 nm; if the doped optical fiber 106 to be tested is a thulium-doped optical fiber, the wavelength division multiplexer 103 is a dual-band optical fiber wavelength division multiplexer with working wavelengths of 793nm and 1940 nm; if the doped optical fiber 106 to be tested is an erbium-doped optical fiber, the wavelength division multiplexer 103 is a dual-band optical fiber wavelength division multiplexer with working wavelengths of 980nm and 1550 nm.
In the present invention, the wavelength division multiplexer 103 is a (1+1) × 1 type wavelength division multiplexer, and the wavelength division multiplexer includes 1 pump Port (Port11 Port), 1 signal Port (Port21 Port) and 1 output Port. Specifically, after being modulated by the square wave of the signal generator 101, the pump laser 102 emits pulse pump laser, which is injected through the pump end of the wavelength division multiplexer 103, and the pulse pump laser after wavelength division multiplexing is input to the doped fiber 106 to be tested through the output end of the wavelength division multiplexer, so that the pulse fluorescent signal generated by exciting the doped fiber 106 to be tested is sent to the photoelectric detector 104, the pulse fluorescent signal is converted into an electrical signal by the photoelectric detector 104 and then sent to the oscilloscope 105, and finally the fluorescence life of the doped fiber 106 to be tested is displayed through the oscilloscope 105.
On the basis of the above embodiment, the falling edge time of the pulse pumping laser is less than 10 μ s, the repetition frequency is less than or equal to 10Hz, and the pulse width is less than or equal to 10 ms.
On the basis of the above embodiment, the detection wavelength range of the photodetector 104 is 200nm to 2400 nm.
On the basis of the above embodiment, the bandwidth of the oscilloscope 105 is greater than or equal to 400 Mhz.
On the basis of the above embodiment, the optical isolator 107 is a pigtail type optical isolator, and the isolation is 22dB or more.
In an embodiment of the present invention, referring to fig. 1, the doped fiber 106 to be tested is an example of an ytterbium-doped fiber, and the wavelength division multiplexer 103 is of a (1+1) × 1 type. Firstly, a signal generator 101 is connected with a pump laser 102 through a control line, an output pigtail of the pump laser 102 is connected with an input end of an optical isolator 107, and the pigtail of the optical isolator 107 is welded with an input end (namely a pump end) of a wavelength division multiplexer 103; further, an output pigtail (i.e. an output end) of the wavelength division multiplexer 103 is fused with one end of the doped fiber 106 to be detected, the other end of the doped fiber 106 to be detected is connected with an input end of the photodetector 104, an output end of the photodetector 104 is connected with an input end of the oscilloscope 105, wherein the working wavelength of the pump laser 102 is 976nm, the working wavelength of the wavelength division multiplexer 103 is 976nm and 1064nm, and the isolation is not lower than 20 dB.
Further, the signal generator 101, the pump laser 102 and the oscilloscope 105 are sequentially turned on, and the repetition frequency and the pulse width of the signal generator 101, the output power of the pump laser 102, the horizontal time and the amplitude of the oscilloscope 105 and other parameters are set. At this time, the horizontal axis of the display module of the oscilloscope 105 is a time parameter, the vertical axis is an amplitude parameter, when the oscilloscope 105 receives the electrical signal converted from the fluorescence signal, the change data of the pulse fluorescence signal amplitude attenuated along with the time is obtained, and the fluorescence lifetime of the ytterbium-doped optical fiber is obtained through the change data displayed by the display module of the oscilloscope 105.
It should be noted that, in the present invention, if the doped fiber 106 to be measured is an erbium-doped fiber, only the corresponding output wavelength and the operating wavelength of the pump laser 102 and the wavelength division multiplexer 103 need to be selected, for example, the output wavelength of the pump laser 102 is 976nm, and the operating wavelength of the wavelength division multiplexer 103 is a dual band of 976nm and 1550 nm; if the doped fiber 106 to be measured is a thulium-doped fiber, the output wavelength of the pump laser 102 is 793nm, and the working wavelength of the wavelength division multiplexer 103 is 793nm and 1940 nm. To specific measurement step, the mode with above-mentioned embodiment is unanimous basically, the embodiment of the utility model discloses no longer describe to this.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. The utility model provides a doped fiber fluorescence life measuring device which characterized in that, includes signal generator, pump laser ware, wavelength division multiplexer, the doped fiber that awaits measuring, photoelectric detector and oscilloscope, wherein:
the output end of the signal generator is connected with the input end of the pump laser and is used for carrying out square wave modulation on the pump laser to generate pulse pump laser;
the output end of the pump laser is connected with the pump end of the wavelength division multiplexer and used for sending the pulse pump laser to the wavelength division multiplexer;
the output end of the wavelength division multiplexer is connected with one end of the doped optical fiber to be detected and is used for carrying out wavelength division multiplexing on the pulse pumping laser and sending the pulse pumping laser subjected to wavelength division multiplexing to the doped optical fiber to be detected so as to excite the doped optical fiber to be detected and generate a fluorescence signal;
the input end of the photoelectric detector is connected with the other end of the doped optical fiber to be detected and used for converting the fluorescence signal into an electric signal;
and the input end of the oscilloscope is connected with the output end of the photoelectric detector and is used for displaying the attenuation change of the electric signal along with time so as to obtain the fluorescence life of the doped optical fiber to be detected.
2. The doped fiber fluorescence lifetime measurement device of claim 1, further comprising an optical isolator, wherein an input end of the optical isolator is connected to an output end of the pump laser, and an output end of the optical isolator is connected to a pump end of the wavelength division multiplexer.
3. The doped fiber fluorescence lifetime measuring device of claim 1, wherein the output wavelength of the pump laser is determined according to the doping medium of the doped fiber to be measured, wherein if the doped fiber to be measured is an ytterbium-doped fiber, the output wavelength of the pump laser is 976 ± 5 nm; if the doped optical fiber to be detected is the thulium-doped optical fiber, the output wavelength of the pump laser is 793 +/-5 nm; and if the doped fiber to be detected is erbium-doped fiber or erbium-ytterbium co-doped fiber, the output wavelength of the pump laser is 980 +/-5 nm.
4. The doped fiber fluorescence lifetime measuring device of claim 1, wherein the wavelength division multiplexer has an operating wavelength determined according to the doping medium of the doped fiber to be measured, wherein if the doped fiber to be measured is an ytterbium-doped fiber, the wavelength division multiplexer is a dual-band fiber wavelength division multiplexer having operating wavelengths of 976nm and 1064 nm; if the doped optical fiber to be detected is the thulium-doped optical fiber, the wavelength division multiplexer is a dual-band optical fiber wavelength division multiplexer with working wavelengths of 793nm and 1940 nm; and if the doped optical fiber to be detected is the erbium-doped optical fiber, the wavelength division multiplexer is a dual-band optical fiber wavelength division multiplexer with working wavelengths of 980nm and 1550 nm.
5. The doped fiber fluorescence lifetime measuring device of claim 1, wherein the falling edge time of the pulsed pump laser is less than 10 μ s, the repetition frequency is less than or equal to 10Hz, and the pulse width is less than or equal to 10 ms.
6. The doped fiber fluorescence lifetime measurement device of claim 1, wherein the detection wavelength range of the photodetector is 200nm to 2400 nm.
7. The doped fiber fluorescence lifetime measurement device of claim 1, wherein the oscilloscope bandwidth is greater than or equal to 400 Mhz.
8. The doped fiber fluorescence lifetime measurement device of claim 2, wherein the optical isolator is a pigtail type optical isolator having an isolation of 22dB or greater.
9. The doped fiber fluorescence lifetime measuring device of any one of claims 1 to 8, wherein the doped fiber to be measured is a rare earth doped fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220407377.9U CN217132528U (en) | 2022-02-25 | 2022-02-25 | Doped optical fiber fluorescence life measuring device |
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| CN202220407377.9U CN217132528U (en) | 2022-02-25 | 2022-02-25 | Doped optical fiber fluorescence life measuring device |
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