CN100405674C - Tunable whole-optical fiber structural narrow band narrow pulse laser - Google Patents
Tunable whole-optical fiber structural narrow band narrow pulse laser Download PDFInfo
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- CN100405674C CN100405674C CNB2006100289623A CN200610028962A CN100405674C CN 100405674 C CN100405674 C CN 100405674C CN B2006100289623 A CNB2006100289623 A CN B2006100289623A CN 200610028962 A CN200610028962 A CN 200610028962A CN 100405674 C CN100405674 C CN 100405674C
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Abstract
A tunable all optical fiber structure narrowband narrow pulse laser consists of distributed feedback optical fiber laser, coupling optical fiber, electrolight waveguide intensity modulator, electric impulse generating circuit, radio frequency connector outputting optical fiber, wherein output port of distributed feedback optical fiber laser connected with coupling optical fiber of electrolight waveguide modulator input end, output port of electric impulse generating circuit connected with said electrolight waveguide modulator through radio frequency connector, the output port of said electrolight waveguide modulator connected with said outputting optical fiber. Said invention can set pulse parameter at any moment, with narrow pulse width, wide tuning range and reliable performance.
Description
Technical field
The present invention relates to laser, particularly a kind of tunable whole-optical fiber structural narrow band narrow pulse laser can be used as distributed optical fiber sensing system, LDMS, the light-pulse generator of high power laser system.
Background technology
In distributed optical fiber sensing system, narrow pulse laser is one of its core component.This generator need be realized the nanosecond pulsewidth, and pulse strength, pulse repetition frequency are all adjustable, and requires LASER Light Source to be single longitudinal mode, narrow bandwidth, stability height, not to be subject to external interference.Traditional pulsed light generation systems adopts semiconductor laser and acousto-optic modulator, makes optical-fiber laser be modulated to pulsed light through acousto-optic crystal.The deficiency of this scheme is the laser bandwidth broad of semiconductor laser output, and has the coupling efficiency problem with fibre system, uses inconvenience.Acousto-optic chopper volume is big in addition, the half-wave voltage height, and also frequency band is narrow, and extinction ratio is low, can only modulate the pulse about 100ns, far can not satisfy the optical fiber sensing system actual needs.
Summary of the invention
The purpose of this invention is to provide a kind of tunable whole-optical fiber structural narrow band narrow pulse laser that is applicable to optical fiber sensing system, pulse parameter can be set at any time, and pulse width, tuning range is wide, dependable performance.
Technical solution of the present invention is as follows:
A kind of tunable whole-optical fiber structural narrow band narrow pulse laser, it is characterized in that it is by distributed feed-back (hereinafter to be referred as DFB) fiber laser, coupled fiber, the electro-optical transducer intensity modulator, electric pulse produces circuit, radio frequency connector and output optical fibre are formed, its annexation is: the output of DFB fiber laser is connected with coupled fiber with the input of electro-optical transducer intensity modulator, the output that electric pulse produces circuit links to each other the described output optical fibre of output termination of this electro-optical transducer intensity modulator with described electro-optical transducer intensity modulator by radio frequency connector.
Described electric pulse produces circuit and is made of programmable logic device, pulse amplifier, keyboard and LCDs, and described programmable logic device produces required pulsewidth, the electric pulse of repetition rate; LCDs shows current pulse parameter in real time, and the electric pulse of generation is added on the described electro-optical transducer intensity modulator after amplifying through pulse amplifier, carries out tuning to the continuous laser by the output of DFB fiber laser.
The invention has the advantages that:
1, all optical fibre structure is avoided space optical coupling, so output is stable, and the efficient height, better compatible with the overall optical fiber sensor system
2, with optical fiber DFB as the sensor-based system LASER Light Source, the system that easily realizes is to the light source narrow bandwidth, the single longitudinal mode requirement
3, pulse parameter can conveniently be regulated, and wherein pulsewidth, repetition rate can be imported by keyboard, and pulse power can be regulated by manual knob
4, impulse bandwidth.Because pulse modulation device employing maximum operating frequency can reach the electrooptic waveguide modulator of 10GHZ, so the narrowest pulsewidth only is confined to the operating frequency of electric pulse generator.Electric pulse generator adopts programmable logic device as core devices, can produce narrow pulse to 10ns, about edge 3ns.
Description of drawings
Fig. 1 is a tunable whole-optical fiber structural burst pulse optical generator overall structure block diagram of the present invention
Fig. 2 produces the structured flowchart of circuit for electric pulse of the present invention
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 is a tunable whole-optical fiber structural burst pulse optical generator overall structure block diagram of the present invention, as seen from the figure, tunable whole-optical fiber structural narrow band narrow pulse laser of the present invention is by DFB fiber laser 1, coupled fiber 2, electro-optical transducer intensity modulator 3, electric pulse produces circuit 4, radio frequency connector 5 and output optical fibre 6 are formed, its annexation is: the input of the output of DFB fiber laser 1 and electrooptic waveguide modulator 2 is connected with coupled fiber 2, the output that electric pulse produces circuit 4 links to each other the described output optical fibre 6 of the output termination of this electrooptic waveguide modulator 3 by radio frequency connector 5 with described electrooptic waveguide modulator 3.
Described electric pulse produce circuit 4 by programmable logic device 4-1,, pulse amplifier 4-2, keyboard 4-3 and LCDs 4-4 constitute, described programmable logic device 4-1 produces required pulsewidth, the electric pulse of repetition rate; LCDs 4-4 shows current pulse parameter in real time, and the electric pulse of generation is added on the described electrooptic waveguide modulator 3 after amplifying through pulse amplifier 4-2.
DFB fiber laser 1 is responsible for producing continuous laser, and electric pulse produces circuit 4 and produces required electric pulse, is added on the electrooptic waveguide modulator 3 by radio frequency connector 5, and electrooptic waveguide modulator 3 is promptly by the corresponding light pulse of output optical fibre 6 outputs.The pulsewidth of pulse, peak power, the keyboard input that repetition rate produces circuit 4 by electric pulse, electric pulse produces circuit 4 external LCDs, calculates by program, shows current output optical pulse parameter at any time.
DFB fiber laser 1 is responsible for producing the laser of output continuously, the laser of output is coupled into electrooptic waveguide modulator 3 through coupled fiber 2 and carries out copped wave, the shape of output optical pulse depends on the shape of electric pulse generator 4 electric pulse that produces, the peak power of output optical pulse and contrast depend on the voltage of importing electric pulse, but pulse peak power is not higher than the continuous laser power of being imported.Regulate pulsewidth, repetition rate and the output voltage of electric pulse, i.e. the parameter of may command output optical pulse.Electric pulse produces the circuit structure block diagram as shown in Figure 2, and electric pulse produces circuit 4 and comprises programmable logic device 4-1, pulse amplifier 4-2, keyboard 4-3 and LCDs 4-4.Programmable logic device 4-1 is a slice large scale integrated chip, and this chip internal loads distinct program, can realize different circuit functions, and its effect is equivalent to a slice CPU.The user can be provided with pulsewidth, repetition rate by keyboard 4-3, and programmable logic device 4-1 is responsible for the information of collection analysis keyboard 4-3 input, produces required pulsewidth, the electric pulse of repetition rate according to these information; LCDs 4-4 shows current pulse parameter in real time.The electric pulse that produces is added on the electrooptic waveguide modulator 3 after amplifying through pulse amplifier 4-2.Pulse amplifier 4-2 is a gain adjustable amplifier, and the multiplication factor of regulating impulse amplifier 4-2 can be adjusted the electric pulse crest voltage, thereby changes the output optical pulse peak power of electrooptic waveguide modulator.
The present invention adopts DFB fiber laser and electro-optical transducer intensity modulator to realize pulse generation, the single longitudinal mode of Distributed Feedback Laser, narrow bandwidth can satisfy the requirement of optical fiber sensing system, and these device input and output are the optical fiber coupling, can be directly and the welding of modulator input optical fibre with the output optical fibre of fiber laser, avoided the coupling of spatial light like this, guaranteed the compactness of system, loss is low, easy to use; Device half-wave voltage low (having only 5.4V) has been avoided the use high voltage source, has strengthened the stability of a system; Frequency band can reach 10GHZ, and the narrowest light pulse that can cut out is limited by driving power.Driving power adopts the high-speed programmable logical device as the seed signal of telecommunication source to take place, and amplifies through the high speed amplifying circuit then, and the electric impulse signal after the amplification is added on the electrooptic waveguide modulator, can obtain the adjustable light pulse of pulsewidth 10ns-500ns.
Claims (2)
1. tunable whole-optical fiber structural narrow band narrow pulse laser, it is characterized in that it is by distributed feedback optical fiber laser (1), coupled fiber (2), electro-optical transducer intensity modulator (3), electric pulse produces circuit (4), radio frequency connector (5) and output optical fibre (6) are formed, its annexation is: the input of the output of distributed feedback optical fiber laser (1) and electro-optical transducer intensity modulator (3) is connected with coupled fiber (2), the output that electric pulse produces circuit (4) links to each other the described output optical fibre of output termination (6) of this electro-optical transducer intensity modulator (3) by radio frequency connector (5) with described electro-optical transducer intensity modulator (3).
2. tunable whole-optical fiber structural narrow band narrow pulse laser according to claim 1, it is characterized in that described electric pulse produces circuit (4) and is made of programmable logic device (4-1), pulse amplifier (4-2), keyboard (4-3) and LCDs (4-4), described programmable logic device (4-1) produces required pulsewidth, the electric pulse of repetition rate; LCDs (4-4) shows current pulse parameter in real time, and the electric pulse of generation is added on the described electro-optical transducer intensity modulator (3) after amplifying through pulse amplifier (4-2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100289623A CN100405674C (en) | 2006-07-14 | 2006-07-14 | Tunable whole-optical fiber structural narrow band narrow pulse laser |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100289623A CN100405674C (en) | 2006-07-14 | 2006-07-14 | Tunable whole-optical fiber structural narrow band narrow pulse laser |
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| Publication Number | Publication Date |
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| CN1889310A CN1889310A (en) | 2007-01-03 |
| CN100405674C true CN100405674C (en) | 2008-07-23 |
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| CNB2006100289623A Expired - Fee Related CN100405674C (en) | 2006-07-14 | 2006-07-14 | Tunable whole-optical fiber structural narrow band narrow pulse laser |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5448579A (en) * | 1993-12-09 | 1995-09-05 | Hewlett-Packard Company | Polarization independent picosecond fiber laser |
| US6097741A (en) * | 1998-02-17 | 2000-08-01 | Calmar Optcom, Inc. | Passively mode-locked fiber lasers |
| JP2000216463A (en) * | 1999-01-19 | 2000-08-04 | Lucent Technol Inc | Laser incorporating tunable diffraction grating for group velocity dispersion compensation |
| CN1776974A (en) * | 2005-11-29 | 2006-05-24 | 胡姝玲 | Short-pulse ytterbium-doped double-cladded-layer optical fiber laser |
| CN2922217Y (en) * | 2006-07-14 | 2007-07-11 | 中国科学院上海光学精密机械研究所 | Tunable all optical fiber structure narrow-band and anrrow-pluse laser device |
-
2006
- 2006-07-14 CN CNB2006100289623A patent/CN100405674C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5448579A (en) * | 1993-12-09 | 1995-09-05 | Hewlett-Packard Company | Polarization independent picosecond fiber laser |
| US6097741A (en) * | 1998-02-17 | 2000-08-01 | Calmar Optcom, Inc. | Passively mode-locked fiber lasers |
| JP2000216463A (en) * | 1999-01-19 | 2000-08-04 | Lucent Technol Inc | Laser incorporating tunable diffraction grating for group velocity dispersion compensation |
| CN1776974A (en) * | 2005-11-29 | 2006-05-24 | 胡姝玲 | Short-pulse ytterbium-doped double-cladded-layer optical fiber laser |
| CN2922217Y (en) * | 2006-07-14 | 2007-07-11 | 中国科学院上海光学精密机械研究所 | Tunable all optical fiber structure narrow-band and anrrow-pluse laser device |
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| CN1889310A (en) | 2007-01-03 |
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Granted publication date: 20080723 Termination date: 20110714 |