CN201853937U - Optical-fiber laser light source and optical-fiber sensing system based on pulse seed source amplification - Google Patents
Optical-fiber laser light source and optical-fiber sensing system based on pulse seed source amplification Download PDFInfo
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- CN201853937U CN201853937U CN2010202904667U CN201020290466U CN201853937U CN 201853937 U CN201853937 U CN 201853937U CN 2010202904667 U CN2010202904667 U CN 2010202904667U CN 201020290466 U CN201020290466 U CN 201020290466U CN 201853937 U CN201853937 U CN 201853937U
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Abstract
The utility model relates to a short-pulse high-power optical-fiber laser light source and an optical-fiber sensing system based on pulse seed source amplification, wherein the optical-fiber laser light source comprises a pulse signal source, a laser-device high-speed driving circuit, a pulse seed laser device, a wavelength division multiplexer, a rare-earth doped optical fiber and a pump laser device, wherein the pulse signal source, the laser-device high-speed driving circuit, the pulse seed laser device, the wavelength division multiplexer and the rare-earth doped optical fiber are sequentially connected, the output end of the pump laser device is connected with the input end of the wavelength division multiplexer, and the rare-earth doped optical fiber is also provided with a high-peak pulse-laser output end. The utility model also relates to the optical-fiber sensing system utilizing the light source. Since the optical-fiber laser light source and the optical-fiber sensing system disclosed by the utility model are adopted, rare-earth metal ions can be excited to a metastable state when the light output by the pump laser device is illuminated onto the rare-earth metal ions, the number of the rare-earth metal ions in the metastable state reaches a high energy-level inverted number when the light is continuously injected by a pump, and at the time, a signal light is illuminated, a huge magnification factor is formed by the high energy-level inverted number, and the metastable ions return to a ground state to release a high-peak pulse light.
Description
Technical field
The utility model photoelectron relates to the field, and particularly technical field of optical fiber sensing specifically is meant a kind of fiber laser light source and optical fiber sensing system that amplifies based on the pulse seed source.
Background technology
Optical fiber sensing system based on Raman scattering and Brillouin scattering technology, because it has sensor information simple (ordinary optic fibre), the characteristics of continuous distribution formula sensing, use at stress of building health monitorings such as bridge, tunnel, dams in a large number, and the industries such as temperature monitoring of oil, power transmission and transformation cable pipeline.
This type of optical fiber sensing system adopts following structure substantially: the high-peak power light-pulse generator is injected into sensor fibre by directional coupler, in general single mode fiber or the common multimode fiber, because Raman scattering, can produce the back to stokes light and anti-Stokes light, and temperature and stress can cause the variation of Raman effect in the sensor fibre, by detecting Stokes (stocks) light and anti-Stokes (anti-stocks) light, and it is analyzed, can measure the temperature and the STRESS VARIATION of the every bit on the sensor fibre.Wait processing through the contrast calibration, just can be to the fire alarm of building healthy early warning or temperature.
Wherein, core component, the high-peak power light-pulse generator, conventional way be to add that by high power laser the pulse high peak current realizes.This technology has following shortcoming:
(1) be difficult to accomplish high peak power, the influence of Stimulated Light device manufacturing process, the high-peak power semiconductor laser of practicability is seldom;
(2) with high costs, because the laser output of high-peak power is few, be difficult for realizing, so production cost is high;
(3) be difficult to realize short pulse, because the spatial resolution index of the direct decision systems test of the pulse length of this system, the system of measuring accuracy below 1m, need pulsewidth about 10ns, and the high-peak power semiconductor laser drive current is very big, usually in tens of order of amps, opening and closing high electric current like this fast in the so short time, circuit is realized quite difficulty.
In a word, conventional pulse laser mode still is the commercialization level that all is difficult to the system that reaches in cost control on technology realizes.
The utility model content
The purpose of this utility model is to have overcome above-mentioned shortcoming of the prior art, a kind of distinctive amplification of rare-earth doped optical fibre and energy storage characteristics utilized are provided, realize big peak power and short pulse, and structure is simple relatively, the fiber laser light source and the optical fiber sensing system based on the amplification of pulse seed source of low production cost.
In order to realize above-mentioned purpose, the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source of the present utility model has following formation:
This fiber laser light source comprises pulse signal source, laser high-speed driving circuit, pulse seed laser, wavelength division multiplexer and the rare-earth doped optical fibre that is linked in sequence, described fiber laser light source also comprises pump laser, the output of described pump laser connects the input of described wavelength division multiplexer, and described rare-earth doped optical fibre also has peak value pulse laser output.
Be somebody's turn to do in the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source, described fiber laser light source also comprises first fibre optic isolater that is connected between described pulse seed laser and the wavelength division multiplexer.
Be somebody's turn to do in the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source, described fiber laser light source also comprises second fibre optic isolater that is connected in described peak value pulse laser output.
Be somebody's turn to do in the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source, the length of described rare-earth doped optical fibre is 20 meters.
Be somebody's turn to do in the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source, described pulse seed laser is distributed feedback laser, fabry-Perot type laser or distributed Bragg reflection laser.
Be somebody's turn to do in the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source, described rare-earth doped optical fibre is Er-doped fiber, Yb dosed optical fiber or mixes praseodymium optical fiber.
The utility model also provides the optical fiber sensing system of a kind of described fiber laser light source as light source, this optical fiber sensing system also comprises directional coupler, sensor fibre and back scattering checkout gear, described fiber laser light source connects described sensor fibre by described directional coupler, and described back scattering checkout gear is connected with described directional coupler.
In this optical fiber sensing system, described back scattering checkout gear is Raman back scattering checkout gear or Brillouin's back scattering checkout gear.
In this optical fiber sensing system, described sensor fibre is general single mode fiber or common multimode fiber.
The short pulse high power optical fibre laser light source and the optical fiber sensing system based on the amplification of pulse seed source of this utility model have been adopted, because the rare earth ion in the rare-earth doped optical fibre is a three level system, when the light of pump laser output is got on the rare earth ion and it can be energized into metastable state, and on this metastable state, rare earth ion has the life-span that reaches Millisecond, be not disturbed as rare earth ion, then it gets back to ground state with exponential damping, send spontaneous radiation (ASE) light, but when pumping is injected always, rare earth ion number on the metastable state can be a lot, are referred to as high energy level inverted population, at this moment, squeeze into a flashlight, high energy level inverted population can form a huge multiplication factor, make most metastable state ion get back to ground state, and discharge the pulsed light of a peak value.This pulse peak power is the long energy accumulation of pumping, and in fact this process is exactly the process of an energy storage and release, utilizes this process can easily obtain the pulsed light of high-peak power.The utility model is simple in structure, low production cost.
Description of drawings
Fig. 1 be the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source of the present utility model structural representation.
Fig. 2 is the structural representation that utilizes the optical fiber sensing system of the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source of the present utility model.
Embodiment
In order more to be expressly understood technology contents of the present utility model, describe in detail especially exemplified by following examples.
See also shown in Figure 1ly, be the structural representation of a kind of execution mode of the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source of the present utility model.
This fiber laser light source comprises pulse signal source, laser high-speed driving circuit, pulse seed laser, wavelength division multiplexer and the rare-earth doped optical fibre that is linked in sequence, described fiber laser light source also comprises pump laser, the output of described pump laser connects the input of described wavelength division multiplexer, and described rare-earth doped optical fibre also has peak value pulse laser output.
In this embodiment, described fiber laser light source can also comprise first fibre optic isolater that is connected between described pulse seed laser and the wavelength division multiplexer, and second fibre optic isolater that is connected in described peak value pulse laser output.
In this embodiment, described pulse seed laser is a general communication with the straight mode 1550nm of 2.5bps distributed feedback laser (Distributed Feedback Laser); It is carried out pulsed drive, pulsewidth 10ns, repetition 10KHz, peak power 10mW; Pump laser adopts optical fiber communication erbium-doped fiber amplifier 980nm pump laser commonly used, constant output 250mW power; Rare-earth doped optical fibre is selected Er-doped fiber for use, and model is Nufern EDF-C-980, and length is 20 meters; Wavelength division multiplexer adopts the 980nm/1550nm wavelength division multiplexer; Its pulse laser is output as pulsewidth 10ns, repetition 10KHz, and peak power 20W, average power 2mW meets the application of distributed sensing fully.
In other execution mode of the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source of the present utility model, described pulse seed laser can also be fabry-Perot type laser (FP laser) or distributed Bragg reflection laser (DBR laser), and wavelength can be 1060nm; Described rare-earth doped optical fibre can also be selected Yb dosed optical fiber for use or mix spectrum optical fiber; Pump laser wavelength and power and corresponding doped fiber coupling.
Utilize the optical fiber sensing system of above-mentioned fiber laser light source provided by the utility model as light source, its structure as shown in Figure 2.This optical fiber sensing system also comprises directional coupler, sensor fibre and back scattering checkout gear, described fiber laser light source connects described sensor fibre by described directional coupler, and described back scattering checkout gear is connected with described directional coupler.Described sensor fibre is general single mode fiber or common multimode fiber.
In preferred embodiment, described back scattering checkout gear is Raman back scattering checkout gear or Brillouin's back scattering checkout gear.
In application of the present utility model, the following structure of the general employing of short pulse high power optical fibre laser light source of amplifying of the present utility model based on the pulse seed source:
The pulse seed laser adopts the good laser of live width can carry out High Speed Modulation, and with the straight mode 1550nm of 2.5bps distributed feedback laser, these lower powered lasers are very easy to obtain, and low price such as general communication.
The driving of pulse seed laser can be with reference to the general communication modulation circuit, and signal source can be that derived digital signal also can be a simulation signal generator.
Amplifier section is selected at the pulse seed laser wavelength.Usually signal source C-band (1525～1565nm) or L-band (1570～1610nm), select Er-doped fiber, pump laser is selected wavelength is 980nm or 1480nm.Signal source is at 1030nm～1090nm, and selecting wavelength is pump laser and the Yb dosed optical fiber of 976nm, and other signal sources are no longer detailed lifts.
The output peak power can be adjusted by the length of adjusting pump laser power and rare-earth doped optical fibre, reaches as high as hundreds of watts of magnitudes.Repetition rate and pulsewidth can realize by the source driving signal of adjusting the pulse seed laser, therefore realize adjusting flexibly easily.
For C or L-band light source,, there are a large amount of abundant and ripe devices available because it works in the general communication wave band.Directly transfer the high power pulse of generation than same laser, cost reduces by 50% at least.
Wherein, the pulse seed laser promotes the laser high-speed driving circuit by pulse signal source and realizes pulse output.Because this seed laser power output is low, the peak power of common tens of milliwatts, this laser adopts in the optical fiber communication of maturation in a large number, is very easy to obtain, and also with low cost.And because peak power is low, pulse driving circuit also is very ripe in the communications field, the pulse of ns level only be equivalent to the to communicate by letter speed of GHz magnitude.Greatly reduce the realization difficulty and the cost of pulse seed.First fibre optic isolater and second fibre optic isolater are used to suppress the light of echo, and the protection seed source is to bring more performance.The wavelength division multiplexer effect is pump light and seed source flashlight to be lumped together be injected in the rare-earth doped optical fibre.Pump laser is selected according to system's operation wavelength, is used for providing the laser of energy to whole amplification system.Usually select 980nm or 1480nm laser to remove the flashlight of pumping 1550nm such as adopting Er-doped fiber.This also is the principle of the erbium-doped fiber amplifier of and extensive application very ripe at fiber optic communication field.In rare-earth doped optical fibre, because pump light is continuous operation, and flashlight is the short pulse of low-repetition-frequency, considerable time, and in the time such as hundred microsecond magnitudes, the input of no signal light, doped fiber is in high population inversion state.At this moment, the flashlight of ns level injects, and will discharge lot of energy in the doped fiber in moment (in the time suitable with the signal pulse width), and the particle inverted population are lowered very soon.The high power signals that output simultaneously and signal light wavelength, polarization, phase place suppress, and realized the pulse output of high-peak power.The short pulse high power optical fibre laser light source that this utility model provided has used the energy storage characteristics of rare-earth doped optical fibre dexterously, obtains huge peak power with less pump power.
The short pulse high power optical fibre laser light source and the optical fiber sensing system based on the amplification of pulse seed source of this utility model have been adopted, because the rare earth ion in the rare-earth doped optical fibre is a three level system, when the light of pump laser output is got on the rare earth ion and it can be energized into metastable state, and on this metastable state, rare earth ion has the life-span that reaches Millisecond, be not disturbed as rare earth ion, then it gets back to ground state with exponential damping, send spontaneous radiation (ASE) light, but when pumping is injected always, rare earth ion number on the metastable state can be a lot, are referred to as high energy level inverted population, at this moment, squeeze into a flashlight, high energy level inverted population can form a huge multiplication factor, make most metastable state ion get back to ground state, and discharge the pulsed light of a peak value.This pulse peak power is the long energy accumulation of pumping, and in fact this process is exactly the process of an energy storage and release, utilizes this process can easily obtain the pulsed light of high-peak power.The utility model is simple in structure, low production cost.
In this specification, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (8)
1. short pulse high power optical fibre laser light source that amplifies based on the pulse seed source, it is characterized in that, described fiber laser light source comprises pulse signal source, laser high-speed driving circuit, pulse seed laser, wavelength division multiplexer and the optical fiber that is linked in sequence, described optical fiber is Er-doped fiber, Yb dosed optical fiber or mixes praseodymium optical fiber, described fiber laser light source also comprises pump laser, the output of described pump laser connects the input of described wavelength division multiplexer, and described optical fiber also has peak value pulse laser output.
2. the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source according to claim 1, it is characterized in that described fiber laser light source also comprises first fibre optic isolater that is connected between described pulse seed laser and the wavelength division multiplexer.
3. the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source according to claim 1 is characterized in that described fiber laser light source also comprises second fibre optic isolater that is connected in described peak value pulse laser output.
4. the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source according to claim 1 is characterized in that the length of described optical fiber is 20 meters.
5. the short pulse high power optical fibre laser light source that amplifies based on the pulse seed source according to claim 1 is characterized in that described pulse seed laser is distributed feedback laser, fabry-Perot type laser or distributed Bragg reflection laser.
6. optical fiber sensing system that utilizes the described fiber laser light source of claim 1 as light source, it is characterized in that, described optical fiber sensing system also comprises directional coupler, sensor fibre and back scattering checkout gear, described fiber laser light source connects described sensor fibre by described directional coupler, and described back scattering checkout gear is connected with described directional coupler.
7. the short pulse high power optical fibre laser light source that utilization according to claim 6 is amplified based on the pulse seed source is as the optical fiber sensing system of light source, it is characterized in that described back scattering checkout gear is Raman back scattering checkout gear or Brillouin's back scattering checkout gear.
8. the short pulse high power optical fibre laser light source that utilization according to claim 6 is amplified based on the pulse seed source is characterized in that as the optical fiber sensing system of light source described sensor fibre is general single mode fiber or common multimode fiber.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560453A (en) * | 2018-10-23 | 2019-04-02 | 华中科技大学 | Passive Q-adjusted mode-locking ring laser based on SBS and fabry perot interferometer |
| CN111964700A (en) * | 2020-08-28 | 2020-11-20 | 武汉理工大学 | Distributed pulse light amplifier based on optical fiber parametric amplification and performance characterization method |
-
2010
- 2010-08-12 CN CN2010202904667U patent/CN201853937U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109560453A (en) * | 2018-10-23 | 2019-04-02 | 华中科技大学 | Passive Q-adjusted mode-locking ring laser based on SBS and fabry perot interferometer |
| CN109560453B (en) * | 2018-10-23 | 2020-09-18 | 华中科技大学 | Passive Q-switched mode-locked ring laser based on SBS and Fabry-Perot interferometer |
| CN111964700A (en) * | 2020-08-28 | 2020-11-20 | 武汉理工大学 | Distributed pulse light amplifier based on optical fiber parametric amplification and performance characterization method |
| US11462880B2 (en) | 2020-08-28 | 2022-10-04 | Wuhan University Of Technology | Distributed pulsed light amplifier based on optical fiber parameter amplification, and amplification and performance characterization method |
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Granted publication date: 20110601 |