CN109813528A - Detection method is lost in optical fiber laser based on optical time domain reflection principle - Google Patents
Detection method is lost in optical fiber laser based on optical time domain reflection principle Download PDFInfo
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- CN109813528A CN109813528A CN201910201727.9A CN201910201727A CN109813528A CN 109813528 A CN109813528 A CN 109813528A CN 201910201727 A CN201910201727 A CN 201910201727A CN 109813528 A CN109813528 A CN 109813528A
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Abstract
A kind of optical fiber laser loss detection method based on optical time domain reflection principle, controls light-pulse generator emission pulse laser signal by signal generator first, through coupler transfer into fiber ring laser system.Then pass through coupler, the back-scattering light and reflected light that pulsed laser signal is excited in photodetector real-time reception fiber ring laser system.Emit pulsed optical signals finally by Data Analysis Services module comparative analysis and received backwards to optical signal, to obtain the background loss and insertion loss of optical fiber in testing fiber Optical Maser System, optical fiber fusion welding point and optical fibre device.The present invention can effectively detect the background loss and insertion loss of optical fiber, optical fiber fusing point and device in full-optical-fiber laser system while not destroying laser structure.The detection method has many advantages, such as easy to operate, accurate positioning and rapid feedback.
Description
Technical field
The invention belongs to the optical fiber lasers based on optical time domain reflection principle, and detection technique field is lost, more specifically, relating to
And a kind of loss detection method of optical fiber laser.
Background technique
In fiber ring laser system, the insertion loss of fusing point loss and related device is all to influence system effectiveness and steady
Surely one of crucial factor run.In fiber optic communication field, judge that long-distance optical fiber is transmitted using the method for optical time domain reflection
In breakpoints of optical fiber position and loss size be common technological means.The basic principle of optical time domain reflection is the arteries and veins of detection
Wash off measure back-scattering light in fibre circuit at any time with the energy distribution curve of distance, to analyze telecommunication optical fiber
Breakpoint location and loss abnormal conditions.And in fiber ring laser system, the insertion loss one of the loss of assessment fusing point and device
As be to be realized using the method for the transmitance for measuring each tested point.Therefore this method is needed to the welding in Optical Maser System
Perhaps optical fibre device is successively detected by measuring by the input optical power and output light function before and after fusing point or device point
Rate, to obtain the insertion loss of fusing point loss or device.This test method has the shortcomings that complicated for operation, and is directed to
For all in one machine full-optical-fiber laser system, taking traditional transmission measurement method to carry out loss test can be to laser system
System structure damages.Therefore the present invention proposes a kind of detection method of novel optical fiber laser loss, carrys out detection fiber and swashs
In light device system fusing point loss and optical fibre device insertion loss, have it is easy to operate, accurate positioning and rapid feedback etc. are excellent
Point.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of based on optical time domain reflection principle
Detection method is lost in optical fiber laser.Optical fiber is assessed by back-scattered light in detection fiber Optical Maser System and reflected light
Optical fiber fusing point loss in Optical Maser System, the insertion loss of optical fibre device and the background loss of optical fiber.Thus it solves existing
There is testing procedure complexity in technology, needs the technical issues of disassembling laser assembly.
To achieve the above object, the present invention provides a kind of, and inspection is lost in the full-optical-fiber laser based on optical time domain reflection principle
Survey method, including the detection being made of light-pulse generator, coupler, signal generator, photodetector and data analysis and processing module
Device, which is characterized in that the loss detection method includes the following steps:
S1. the operation wavelength and pulsewidth phase of signal generator control light-pulse generator transmitting and testing fiber Optical Maser System
The pulsed laser signal for the positive transmission matched, synchronous signal generator will emit electric signal I0It is transferred to Data Analysis Services mould
Block；
S2. the pulsed laser signal of the positive transmission is coupled in testing fiber Optical Maser System by coupler；
S3. photodetector receives scattering light and the reflection by testing fiber Optical Maser System reverse transfer by coupler
Optical signal, and pass through formula IElectricity=α ILightIt converts optical signal into and receives electric signal ILAfter be transferred to Data Analysis Services module,
In formula, α is photoelectric conversion factors；
S4. the background of optical fiber fusing point and device damage in testing fiber Optical Maser System is calculated by Data Analysis Services module
Consume ABackgroundWith insertion loss AInsertion, formula is as follows:
In formula, L is the length of optical fiber in testing fiber Optical Maser System.
Preferably, the light-pulse generator in the step S1, it is characterised in that the light-pulse generator is it is characterized in that wavelength is complete
The non-absorbing wave band of optical fiber laser, for example, mix ytterbium fiber ring laser system can use 1625nm wavelength light-pulse generator.
Preferably, optional picosecond of the signal generator in the step S1 either nanosecond signal generator, for example avenge
Collapse transistor, step diode either Metal Oxide Semiconductor Field Effect Transistor.
Preferably, the fiber coupler in the step S2, the coupling that single mode optical fiber or multimode fibre can be selected to prepare
Clutch.Respectively correspond the loss in the fibre core and inner cladding in detection double-clad optical fiber laser system.
Preferably, the photoelectric detector in the step S3 is monitored from the received back-scattering light of coupler and reflection
The position of light, loss point can pass through equation L=(t2-t1) c/2n is calculated, wherein t1When being triggered for Optical Maser System starting point
Between, t2For the triggered time of system end or loss point, c is the light velocity, and n is optical fibre refractivity.Electrooptical device can be selected
PIN type photodiode or APD avalanche photodide.
Preferably, the testing fiber Optical Maser System in the step S4, it is characterised in that all-fiber structure can be
Fibre laser oscillator is also possible to fiber amplifier, is also possible to the laser structure of cascade multistage amplification.Laser system
Gain fibre in system can be Yb dosed optical fiber, erbium doped fiber laser or other doped fibers.
Compared with prior art, the back-scattered light and reflected light due to being generated using loss point in fiber ring laser system
Loss detection is carried out, the invention has the following advantages:
1. can be to avoid the Operating Complexity of traditional power measurement method；
2. the loss of fusing point and device bring fibre core and covering in fiber ring laser system can be measured respectively；
3. there is overall measurement, it is easy to operate, the advantages that accurate positioning and rapid feedback.
Detailed description of the invention
Fig. 1 is that detection method structural schematic diagram is lost in a kind of full-optical-fiber laser based on optical time domain reflection principle of the present invention
Fig. 2 is the example structure schematic diagram of all-fiber Optical Maser System to be measured in the present invention
Fig. 3 is the test result of ytterbium-doped all fiber amplifier laser system fibre core loss
Specific embodiment
With reference to the accompanying drawing and example, specific embodiments of the present invention will be described in further detail, and following instance is used
In illustrating the present invention, but it is not intended to limit the scope of the invention.
As shown in Figure 1, detection method schematic diagram is lost in a kind of full-optical-fiber laser based on optical time domain reflection principle, by arteries and veins
Wash source 1, coupler 2, signal generator 3, photodetector 4, the composition detection device of Data Analysis Services module 5 off.In this example
Middle to be lost using present invention measurement ytterbium-doped all fiber amplifier laser system fibre core, the amplification of the present embodiment forward pumping to be measured swashs
Light device system 6 is made of pumping source 9, positive bundling device 10, Double Cladding Ytterbium Doped Fiber 12.Bundling device in amplifier is (6+1)
× 1 model, for signal fibre having a size of 20/250 μm, pump is fine having a size of 220/242 μm, and output optical fibre is having a size of 20/400 μm, pumping source 9
With the pump fibre welding of bundling device, the fine 20/400 μm of Double Cladding Ytterbium Doped Fiber welding with 16m long of the output of bundling device, output end is cut
Oblique angle.In order to avoid the influence that ytterbium ion absorbs in fibre core, select operation wavelength for the pulse signal of 1625nm, pulsewidth here
It is set as 3ns.The amplification Optical Maser System 6 of coupler 2 and forward pumping is directly measured forward pumping and is put by the welding of signal fibre
Big laser system fibre core loss, the loss of measurement fibre core and device Insertion Loss data are as shown in Figure 3.The full light is shown clearly in figure
The loss of fusing point and device in fine amplification laser system.The loss of its corresponding fusing point 8, bundling device 10 and fusing point 11.
The present invention proposes a kind of full-optical-fiber laser loss detection method based on optical time domain reflection principle, can effectively examine
The background loss and insertion loss of whole fusing points and device in full-optical-fiber laser are surveyed, there is easy to operate, accurate positioning and fast
The advantages that speed feedback.
Claims (7)
1. detection method is lost in a kind of full-optical-fiber laser based on optical time domain reflection principle, including by light-pulse generator (1), coupling
The detection device that device (2), signal generator (3), photodetector (4) and data analysis and processing module (5) are constituted, feature exist
In the loss detection method includes the following steps:
S1. the operation wavelength and arteries and veins of signal generator (3) control light-pulse generator (1) transmitting and testing fiber Optical Maser System (6)
The pulsed laser signal for the positive transmission that width matches, synchronous signal generator (3) will emit electric signal I0It is transferred to data point
It analyses processing module (5)；
S2. the pulsed laser signal of the positive transmission is coupled to testing fiber Optical Maser System (6) by coupler (2)
In；
S3. photodetector (4) receives the scattering light by testing fiber Optical Maser System (6) reverse transfer by coupler (2)
And reflected light signal, and pass through formula IElectricity=α ILightIt converts optical signal into and receives electric signal ILAfter be transferred at data analysis
It manages module (5), in formula, α is photoelectric conversion factors；
S4. the background of optical fiber fusing point and device in testing fiber Optical Maser System (6) is calculated by Data Analysis Services module (5)
A is lostBackgroundWith insertion loss AInsertion, formula is as follows:
In formula, L is the length of optical fiber in testing fiber Optical Maser System (6).
2. detection method, feature is lost in the full-optical-fiber laser according to claim 1 based on optical time domain reflection principle
The wavelength for being the light-pulse generator (1) is the non-absorbing wave band of gain fibre in full-optical-fiber laser.
3. detection method, feature is lost in the full-optical-fiber laser according to claim 1 based on optical time domain reflection principle
It is, the coupler (2) is capable of the pulsed laser signal of the positive and negative both direction of simultaneous transmission, by replacing coupler (2)
It can detecte the pulsed laser signal in single mode optical fiber or multimode fibre, respectively correspond as double-clad optical fiber laser system
In fibre core and inner cladding in loss.
4. detection method, feature is lost in the full-optical-fiber laser according to claim 3 based on optical time domain reflection principle
It is the coupler (2) using space structure device or all-fiber structure device, such as circulator and splitter.
5. detection method, feature is lost in the full-optical-fiber laser according to claim 1 based on optical time domain reflection principle
It is, the pulsed optical signals of distinct pulse widths is generated by adjusting the signal generator (3), pulse-width regulated range can be from skin
Second arrives nanosecond order.
6. detection method, feature is lost in the full-optical-fiber laser according to claim 1 based on optical time domain reflection principle
It is, the detector response time of the photodetector (4) corresponds to the pulsewidth magnitude of pulse signal, and can be by coupler
(2) reverse optical signal in, which synchronizes, to be converted into electric signal transmission and gives data processing module (5).
7. detection method, feature is lost in the full-optical-fiber laser according to claim 1 based on optical time domain reflection principle
It is, the fiber ring laser system (6) is all-fiber structure, can be fibre laser oscillator, can be optical fiber and swashs
Image intensifer is also possible to the fiber ring laser system using Cascaded amplification mode.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110505011A (en) * | 2019-09-18 | 2019-11-26 | 四川长虹电器股份有限公司 | Fiber failure detection device |
| CN114221696A (en) * | 2021-12-20 | 2022-03-22 | 长飞光纤光缆股份有限公司 | Large-core-diameter optical fiber attenuation coefficient testing method |
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| CN101793600A (en) * | 2010-04-15 | 2010-08-04 | 上海交通大学 | Measuring device and method of optical fibre transmission loss factor |
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| CN104897370A (en) * | 2015-05-27 | 2015-09-09 | 广东高聚激光有限公司 | Fiber welding quality monitoring method and system |
| CN105871457A (en) * | 2016-05-10 | 2016-08-17 | 中国科学院半导体研究所 | Optical time-domain reflectometer system and measuring and using method thereof |
| CN107483106A (en) * | 2017-09-25 | 2017-12-15 | 武汉光迅科技股份有限公司 | A kind of online optical time domain reflectometer structure, detecting system and detection method |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH04274724A (en) * | 1991-03-02 | 1992-09-30 | Fujikura Ltd | Otdr apparatus |
| US5963313A (en) * | 1998-05-15 | 1999-10-05 | Tektronix, Inc. | Optical time domain reflectometer with bandwidth correction |
| CN101793600A (en) * | 2010-04-15 | 2010-08-04 | 上海交通大学 | Measuring device and method of optical fibre transmission loss factor |
| CN202145160U (en) * | 2011-05-25 | 2012-02-15 | 3M创新有限公司 | Optical time domain reflectometer |
| CN104897370A (en) * | 2015-05-27 | 2015-09-09 | 广东高聚激光有限公司 | Fiber welding quality monitoring method and system |
| CN105871457A (en) * | 2016-05-10 | 2016-08-17 | 中国科学院半导体研究所 | Optical time-domain reflectometer system and measuring and using method thereof |
| CN107483106A (en) * | 2017-09-25 | 2017-12-15 | 武汉光迅科技股份有限公司 | A kind of online optical time domain reflectometer structure, detecting system and detection method |
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| CN110505011A (en) * | 2019-09-18 | 2019-11-26 | 四川长虹电器股份有限公司 | Fiber failure detection device |
| CN114221696A (en) * | 2021-12-20 | 2022-03-22 | 长飞光纤光缆股份有限公司 | Large-core-diameter optical fiber attenuation coefficient testing method |
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Application publication date: 20190528 |