CN111829753A - Monitoring device for working state of optical fiber amplifier - Google Patents

Monitoring device for working state of optical fiber amplifier Download PDF

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Publication number
CN111829753A
CN111829753A CN202010486229.6A CN202010486229A CN111829753A CN 111829753 A CN111829753 A CN 111829753A CN 202010486229 A CN202010486229 A CN 202010486229A CN 111829753 A CN111829753 A CN 111829753A
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optical fiber
laser
output
input end
output end
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杨直
李冬娟
赵明祥
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Hangzhou Aochuang Photonics Technology Co ltd
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Hangzhou Aochuang Photonics Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G01M11/319—Reflectometers using stimulated back-scatter, e.g. Raman or fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/0014—Monitoring arrangements not otherwise provided for
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Lasers (AREA)

Abstract

The invention discloses a monitoring device for the working state of an optical fiber amplifier, belonging to the technical field of laser. The optical fiber monitoring system comprises a laser transmission unit, a gain optical fiber, an optical fiber combiner, an optical fiber isolator and a monitoring unit, wherein the laser transmission unit comprises: a monitoring component and a display. The monitoring device for the working state of the optical fiber amplifier solves the problems that the examination is difficult and time-consuming when the optical fiber amplifier is abnormal due to the fact that the working state of the optical fiber amplifier cannot be monitored in real time.

Description

Monitoring device for working state of optical fiber amplifier
Technical Field
The invention relates to the technical field of laser state monitoring, in particular to a monitoring device for the working state of an optical fiber amplifier.
Background
The optical fiber amplifier is an amplifying device capable of amplifying optical signals, when the optical fiber amplifier is used and the working state of the optical fiber amplifier is abnormal, a user needs to open a cover to test and investigate each level of optical fiber amplifier step by step, the process of troubleshooting a problem source is complex and time-consuming, and the time and energy of the user are wasted.
Disclosure of Invention
Therefore, the invention provides a monitoring device for the working state of an optical fiber amplifier, which aims to solve the problem that a user cannot intuitively acquire the working state of the optical fiber amplifier in real time in the prior art.
In order to achieve the above object, the present invention provides the following technical solution, wherein the monitoring device includes:
an optical fiber amplifier, comprising:
a housing having an interior cavity, the housing having a first end surface, the first end surface being parallel to the support surface.
The cover plate is rotatably connected with the shell along a first rotating axis so as to be buckled with the shell.
A laser delivery unit, comprising:
a pump laser capable of emitting pump laser light.
A signal laser capable of emitting a signal laser.
The optical fiber combiner is arranged on the first end face and provided with a first input end and a first output end, a first light path is formed between the first input end and the pump laser, a second light path is formed between the first input end and the signal laser, the optical fiber combiner combines the received pump laser and the signal laser into a laser beam, and the first output end can output the laser beam. And
and the gain optical fiber is arranged on the first end face and is provided with a second input end, and the second input end is connected with the first output end of the optical fiber beam combiner. The gain fiber can absorb the pump light and amplify the signal laser in the laser beam, and the gain fiber emits fluorescence after absorbing the pump laser. The gain fiber is flooded with fluorescence.
A monitoring unit, comprising:
a monitoring subassembly, it locates the apron, the monitoring subassembly includes wave filter and imaging device, the wave filter has an acquisition input and an acquisition output, the acquisition input sets up with gain fiber is corresponding and gathers the optical information that the input can receive gain fiber, optical information filters out fluorescence information through the wave filter, the acquisition output can export the fluorescence information that obtains through filtering, imaging device has a third input and a third output, the third input is connected with the acquisition output looks electricity, the fluorescence information of gathering the output can be received to the third input, the third output can export the fluorescence information that the third input was received. And
and the display is arranged outside the shell and provided with a fourth input end, the fourth input end is electrically connected with the third output end, and the fourth input end receives the fluorescent information output by the third output end.
On the basis of the technical scheme, the invention can be further improved as follows:
furthermore, the gain fiber also has a second output end, and the second output end can output the amplified signal laser.
Further, the laser transmission unit further comprises an optical fiber isolator.
The optical fiber isolator is arranged in the cavity of the optical fiber amplifier and is provided with a fifth input end and a fifth output end.
The fifth input end is connected with the second output end, and the fifth input end can receive the amplified laser output by the second output end.
The fifth output terminal can output the signal laser received by the fifth input terminal.
Furthermore, a fifth output end of the optical fiber isolator and the outside of the housing form a third optical path, and the signal laser output by the fifth output end is transmitted through the third optical path.
Furthermore, the gain fiber is arranged in the cavity in a bending and dispersing manner.
Furthermore, the monitoring component and the amplifier can be fixedly connected in an embedded manner.
The invention has the following advantages:
the monitoring device for the working state of the optical fiber amplifier can monitor the working state of the optical fiber amplifier in real time, when the optical fiber amplifier is abnormal, a user can monitor the working state of the optical fiber amplifier by observing the brightness of a fluorescent image on a display, and dead spots appearing in a gain optical fiber are accurately found out by workers or monitoring components, so that the problems that the optical fiber amplifier is difficult to troubleshoot and consumes time are greatly reduced.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly introduced, and the structures, the proportions, the sizes, and the like shown in the specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the modifications of any structures, the changes of the proportion relationships, or the adjustments of the sizes, without affecting the functions and the achievable purposes of the present invention, and still fall within the scope of the technical contents disclosed in the present invention.
Fig. 1 is a schematic view of an overall structure of an embodiment of the present invention with a lid opened.
FIG. 2 is a flow chart of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a relationship between a laser transmission unit and a detection unit according to an embodiment of the invention.
Fig. 4 is a schematic overall structure diagram of the embodiment of the present invention.
Fig. 5 is a top view of a gain fiber according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
the optical fiber amplifier comprises an optical fiber amplifier 1, a cavity 11, an optical fiber beam combiner 2, a first optical path 21, a second optical path 22, a pumping laser 3, a signal laser 4, a gain optical fiber 5, an optical fiber isolator 6, a third optical path 61, a monitoring component 7, a filter 71, an imaging device 72, a display 8 and a light spot 9.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, an embodiment of the present invention provides a device for monitoring an operating state of an optical fiber amplifier 1, including: an optical fibre amplifier 1 comprises a housing having an internal cavity 11, the housing having a first end face, the first end face being parallel to a support surface. The cover plate is rotatably connected with the shell along a first rotating axis so as to be buckled with the shell.
A laser delivery unit, comprising: the optical fiber combiner 2 is arranged inside the cavity 11 of the optical fiber amplifier 1 and is provided with a first input end and a first output end, the first input end is respectively connected with the pump lasers 3 and the signal lasers 4 through the first light paths 21 and the second light paths 22 in a one-to-one correspondence mode, the pump lasers 3 can emit pump lasers, the signal lasers 4 can emit signal lasers, the optical fiber combiner 2 combines the received pump lasers and the received signal lasers into a laser beam, and the first output end can output the laser beam. The laser processing device is used for combining the pump laser and the signal laser so that the pump laser and the signal laser become a laser beam.
And the gain optical fiber 5 is arranged in the cavity 11 of the optical fiber amplifier 1 and can amplify the signal laser in the laser beam, and the gain optical fiber 5 is provided with a second input end which is connected with the first output end of the optical fiber beam combiner 2. The gain fiber 5 absorbs the pump light, and the gain fiber 5 emits fluorescence after absorbing the pump laser light. The gain fiber 5 is flooded with fluorescence. To provide laser gain to the fiber amplifier 1 so that the laser beam is amplified.
A monitoring unit, comprising: a monitoring component 7, which is arranged on the outer wall of the cavity 11 of the optical fiber amplifier 1, wherein the monitoring component 7 comprises a filter 71 and an imaging device 72, and the imaging device includes but is not limited to a CCD, a camera, an avalanche diode and a PD detector; the filter 71 has an acquisition input end and an acquisition output end, the acquisition input end is arranged corresponding to the gain fiber 5 and can receive the optical information of the gain fiber 5, the optical information filters out the fluorescence information through the filter 71, the acquisition output end can output the fluorescence information obtained through filtering, the imaging device 72 has a third input end and a third output end, the third input end is electrically connected with the acquisition output end, the third input end can receive the fluorescence information output by the acquisition output end, and the third output end can output the fluorescence information received by the third input end. The gain laser monitoring system is used for collecting the fluorescence information of the shooting gain laser, so that the fluorescence information of the gain laser can be monitored in real time.
And the display 8 is arranged outside the cavity 11 of the optical fiber amplifier 1 and is provided with a fourth input end, the fourth input end is electrically connected with the third output end, and the fourth input end receives the fluorescent information output by the third output end. The gain laser is used for displaying the fluorescent pattern of the gain laser, so that a worker can read the fluorescent pattern of the gain optical fiber 5 through the display 8, and the worker can accurately find out the dead pixel inside the gain optical fiber 5 according to the read fluorescent pattern.
As shown in fig. 1-2, an embodiment of the present invention provides a device for monitoring an operating state of an optical fiber amplifier, where the gain fiber 5 further has a second output end, and the second output end is capable of outputting amplified signal laser.
As shown in fig. 1, an embodiment of the present invention provides a device for monitoring an operating state of an optical fiber amplifier 1, and the laser transmission unit further includes an optical fiber isolator 6. The optical fiber isolator 6 is disposed inside the cavity 11 of the optical fiber amplifier 1 and has a fifth input end and a fifth output end. The fifth input end is connected with the second output end, and the fifth input end can receive the amplified laser output by the second output end. The fifth output terminal can output the signal laser received by the fifth input terminal. The signal laser light is used for outputting the amplified signal laser light in a single direction, so that the signal laser light cannot be transmitted reversely.
As shown in fig. 1, the embodiment of the present invention provides a device for monitoring the operating state of an optical fiber amplifier 1, and the monitoring module 7 and the amplifier can be fixedly connected in an embedded manner. So as to more stably monitor the working state of the amplifier.
As shown in fig. 1-2, an embodiment of the present invention provides a device for monitoring an operating state of an optical fiber amplifier 1, in which a gain fiber 5 is disposed in a cavity 11 in a bending and dispersing manner. For making the fluorescence uniformly arranged inside the cavity 11 of the fiber amplifier 1.
As shown in fig. 1, in the apparatus for monitoring the operating state of the optical fiber amplifier 1 according to the embodiment of the present invention, the laser beam output from the third output end of the optical fiber isolator 6 is transmitted through the third optical path 61. For outputting the amplified signal laser.
It should be noted that the type of the optical fiber amplifier can be, but is not limited to, E3X-HD 10.
The type of the optical fiber combiner can adopt but is not limited to MPC RGB 2 x 1.
The model of the pump laser can adopt but is not limited to LD-500.
The signal laser model can be used without limitation SPITLIGHT 200;
the filter model may be employed, but is not limited to, ZCAT 3035-1330.
The model of the imaging device may employ, but is not limited to, PD 140E.
The model of the display can be used without being limited to CRT.
The use process of the monitoring device for the working state of the optical fiber amplifier 1 is as follows:
when the optical fiber amplifier is used, when the optical fiber amplifier 1 works, the pump laser 3 emits pump laser, the gain optical fiber 5 absorbs the pump laser and emits fluorescence along with the gradual increase of the pump power, the fluorescence is filled in the whole gain optical fiber 5, and when the pump power is constant, the fluorescence and the laser amplification are in a balanced and stable state.
When the optical fiber amplifier 1 is in an abnormal state, the fluorescence will be enhanced, and the working state of the optical fiber amplifier 1 can be monitored in real time by observing the brightness of the fluorescence image displayed on the display 8.
When local damage occurs inside the gain optical fiber 5, more fluorescence is scattered at the damaged part, at the moment, a fluorescent bright spot occurs on the gain optical fiber 5, and a worker can judge whether the inside of the gain optical fiber 5 is damaged or not by monitoring the existence of the false bright spot on the gain optical fiber 5.
The working principle is as follows:
the rare earth ion doped gain fiber 5 is an important component of various optical fiber amplifiers 1, and provides laser gain for the optical fiber amplifiers 1. In the process of signal laser amplification, along with the gradual enhancement of pumping power, the gain fiber absorbs the pumping laser and emits fluorescence, and gradually fills the whole gain fiber 5, so that rare earth doped ions are subjected to frequency conversion of laser to emit light, and the rare earth doped ions are caused by electric multi-stage interaction among the rare earth ions, namely interaction of the rare earth ions in an excited state and annihilation to generate cooperative fluorescence emission in a visible waveband.
Assuming that the density of doped particles in the gain fiber 5 is N and the ion number densities of the upper and lower energy levels are N2 and N1, respectively, the cooperative fluorescence intensity I is expressed by the following relationship:
dN2/dt＝0 (1)
under the steady state condition of laser amplification, the stimulated absorption, stimulated radiation probability, stimulated radiation section and spontaneous radiation probability of pump laser, signal laser and amplified spontaneous radiation can be calculated to obtain:
Figure BDA0002519335190000071
EPrepresenting the energy of the pump laser. For laser steady state amplification, the amplified output light intensity IoutAnd the light intensity I of the input signalinAnd pumping energy EPThe relationship of (A) is as follows:
Iout＝Iin*exp(KEP) (3)
in the optical fiber amplifier 1, the pumping power is constant, so that the light intensity of the cooperative fluorescence and the light intensity output by laser amplification are in a competitive relationship, when the optical fiber amplifier 1 is stably amplified, the cooperative fluorescence and the laser amplification are in a balanced and stable state, once the optical fiber amplifier 1 works abnormally, the cooperative fluorescence is increased, the light intensity is enhanced, the brightness of a fluorescence image shot by the imaging device 72 is increased, and the brightness of the cooperative fluorescence image can be observed through the display 8, namely the real-time monitoring of the working state of the optical fiber amplifier is finished; in addition, when local damage occurs inside the gain optical fiber, more fluorescence can be scattered at the damaged part, and the macroscopic expression is that a fluorescent bright spot appears on the optical fiber; therefore, the existence of the bright spots on the gain fiber is also a method for judging whether the gain fiber is internally damaged or not.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. A device for monitoring the operating condition of an optical fiber amplifier, said device comprising:
an optical fiber amplifier, comprising:
a housing having an interior cavity, said housing having a first end surface, said first end surface being parallel to said support surface;
the cover plate is rotatably connected with the shell along a first rotating axis so as to be buckled with the shell;
a laser delivery unit, comprising:
a pump laser capable of emitting pump laser light;
a signal laser capable of emitting a signal laser;
an optical fiber combiner disposed on the first end face, the optical fiber combiner having a first input end and a first output end, a first optical path being formed between the first input end and the pump laser, a second optical path being formed between the first input end and the signal laser, the optical fiber combiner combining the received pump laser and signal laser into a laser beam, the first output end being capable of outputting the laser beam; and
the gain optical fiber is arranged on the first end face and is provided with a second input end, and the second input end is connected with the first output end of the optical fiber beam combiner; the gain fiber can absorb the pump light and amplify the signal laser in the laser beam, and the gain fiber emits fluorescence after absorbing the pump laser; the gain optical fiber is fully distributed with the fluorescence;
a monitoring unit, comprising:
the monitoring component is arranged on the cover plate and comprises a filter and imaging equipment, the filter is provided with a collecting input end and a collecting output end, the collecting input end is arranged corresponding to the gain optical fiber and can receive optical information of the gain optical fiber, the optical information filters out fluorescence information through the filter, the collecting output end can output the filtered fluorescence information, the imaging equipment is provided with a third input end and a third output end, the third input end is electrically connected with the collecting output end, the third input end can receive the fluorescence information output by the collecting output end, and the third output end can output the fluorescence information received by the third input end; and
and the display is arranged outside the shell and provided with a fourth input end, the fourth input end is electrically connected with the third output end, and the fourth input end receives the fluorescent information output by the third output end.
2. An apparatus for monitoring the operational status of an optical fiber amplifier as defined in claim 1, wherein said gain fiber further has a second output end, said second output end being capable of outputting the amplified signal laser.
3. The apparatus for monitoring the operational status of an optical fiber amplifier as claimed in claim 2, wherein said laser transmission unit further comprises an optical fiber isolator;
the optical fiber isolator is arranged in the optical fiber amplifier cavity and is provided with a fifth input end and a fifth output end;
the fifth input end is connected with the second output end, and the fifth input end can receive the amplified laser output by the second output end;
the fifth output end can output the signal laser received by the fifth input end.
4. A device for monitoring the operating condition of an optical fiber amplifier as claimed in claim 3, wherein a third optical path is formed between the fifth output terminal of the optical fiber isolator and the outside of the housing, and the signal laser output from the fifth output terminal is transmitted through the third optical path.
5. The apparatus for monitoring the operating condition of an optical fiber amplifier as claimed in claim 1, wherein said monitoring unit is fixedly connected to said amplifier by means of an embedded connection.
6. The apparatus for monitoring the operational status of an optical fiber amplifier as claimed in claim 1, wherein said gain fiber is disposed inside said cavity in a bend-dispersed manner.
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Publication number Priority date Publication date Assignee Title
CN1113622A (en) * 1994-04-14 1995-12-20 皮雷利·卡维有限公司 Amplified telecommunication system for wavelength-division multiplexing trasmissions
CN101540469A (en) * 2009-04-20 2009-09-23 浙江大学 Optical generation method and devices of tunable high-frequency microwave signals
CN103280691A (en) * 2013-06-05 2013-09-04 苏州图森激光有限公司 High-power laser optical fiber amplifier
CN105281827A (en) * 2015-09-29 2016-01-27 武汉光迅科技股份有限公司 Erbium doped fiber amplifier real time detection system
CN209805831U (en) * 2019-04-30 2019-12-17 无锡市德科立光电子技术有限公司 Case suitable for fiber amplifier performance test
CN110954296A (en) * 2019-12-11 2020-04-03 浙江科技学院 Method and device for detecting optical signal amplification performance of liquid core optical fiber

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1113622A (en) * 1994-04-14 1995-12-20 皮雷利·卡维有限公司 Amplified telecommunication system for wavelength-division multiplexing trasmissions
CN101540469A (en) * 2009-04-20 2009-09-23 浙江大学 Optical generation method and devices of tunable high-frequency microwave signals
CN103280691A (en) * 2013-06-05 2013-09-04 苏州图森激光有限公司 High-power laser optical fiber amplifier
CN105281827A (en) * 2015-09-29 2016-01-27 武汉光迅科技股份有限公司 Erbium doped fiber amplifier real time detection system
CN209805831U (en) * 2019-04-30 2019-12-17 无锡市德科立光电子技术有限公司 Case suitable for fiber amplifier performance test
CN110954296A (en) * 2019-12-11 2020-04-03 浙江科技学院 Method and device for detecting optical signal amplification performance of liquid core optical fiber

Non-Patent Citations (1)

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Title
石俊凯: ""基于大模场面积光子晶体光纤的锁模振荡器及放大器的性能研究"", 《中国博士学位论文全文数据库 信息科技辑》 *

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