CN109888603A - The flat multi-wavelength noise like light-pulse generator of three annular resonant cavities - Google Patents
The flat multi-wavelength noise like light-pulse generator of three annular resonant cavities Download PDFInfo
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- CN109888603A CN109888603A CN201910074503.6A CN201910074503A CN109888603A CN 109888603 A CN109888603 A CN 109888603A CN 201910074503 A CN201910074503 A CN 201910074503A CN 109888603 A CN109888603 A CN 109888603A
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Abstract
The flat multi-wavelength noise like light-pulse generator of three annular resonant cavities; belong to optical information technology field; in order to solve, existing multi-Wavelength Pulses optical source wavelength power difference is big, is difficult to the technical issues of generating flat multi-wavelength; it includes increasing benefit loop, addedlink loop, gaining loop, mode locking ring and interference ring, in which: increasing benefit loop, addedlink loop, gaining loop includes the first pumping source, the second pumping source, the first wavelength division multiplexer, the second wavelength division multiplexer, single mode Er-doped fiber, the first Polarization Controller and the first single mode optical fiber；Mode locking ring includes the one 2 × 2nd coupler, the second Polarization Controller, 1 × 2 coupler and isolator；Interference ring includes the 22 × 2nd coupler, third Polarization Controller, the second single mode optical fiber and bais single-mode；The output of noise like mode locking pulse is realized using the resonant cavity of tricyclic structure, change the polarization state of two-way light by adjusting third Polarization Controller, filter peak intensity in interference ring can be changed, to realize the generation of 3 flat wavelengths respectively, the generation of 4 flat wavelengths, the generation of 5 flat wavelengths.
Description
Technical field
The present invention relates to a kind of flat multi-wavelength noise like light-pulse generators of three annular resonant cavities, belong to optical information technology neck
Domain.
Background technique
1550nm light source working has benefited from the compactedness of optical fiber source in human eye safe waveband, high stability, at a low price
The characteristics of lattice and good beam quality, has in fields such as laser radar, remote sensing, sensing, free space optical communication, laser processings
Preferable application prospect, it has also become one of current most potential laser technology.
Noise like pulse since it is with wider spectrum, high pulse energy, low coherence and narrow pulsewidth, because
It can be used to detection fiber bragg grating array, micro Process and generation super continuous spectrums for this.In addition, due in different materials
Material manufacture field needs the light-pulse generator of different wave length, therefore the noise like light-pulse generator of multi-wavelength can satisfy manufacture field
Demand to different wave length, reduces production cost.
It is mature about the invention of multi-Wavelength Pulses light source and research at present, but more focus on be multi-wavelength quantity,
Flat adequately being studied not of its multi-wavelength, the existing generation multi-Wavelength Pulses light source side of being mainly the following
Case: 1, using nonlinear amplified loop mirror；For example, 2018, Runmin Li et al. people is published on Optics Express periodical
All-polarization-maintaining dual-wavelength mode-locked fiber laser based
on Sagnac loop filter.2, the filter of narrow linewidth is used using high-birefringence fiber Bragg grating, 3.Scheme 1
Based on nonlinear effect, the output of tunable dual wavelength is realized using the mode-locking device of space structure, but destroys light
The all-fiber structure of fibre source, and cannot realize that the laser output nonlinear effect of multiple flat wavelengths can effectively press down simultaneously
Mode competition processed, stability is poor, and structure is complicated, is unfavorable for device and integrates and minimize, and is difficult to the flat more waves generated
It is long.The obtained multiwavelength laser number of wavelengths of scheme 2 is limited, and number of wavelengths is untunable, it is difficult to it is defeated to generate 3 above wavelength
Out.Scheme 3 can only filter out the wavelength of specific band, but this can reduce output power and expensive.Therefore it needs to propose one
Kind all-fiber structure can effectively inhibit the peak power of multi-wavelength simultaneously, be to improve multi-Wavelength Pulses light source performance, reduce
The most effectual way method of cost.
Summary of the invention
Existing multi-Wavelength Pulses optical source wavelength power difference is big, is difficult to generate the skill of flat multi-wavelength in order to solve by the present invention
Art problem proposes a kind of noise like light-pulse generator using tricyclic structure, can be realized the flat mode locking pulse of multi-wavelength
Output.
The flat multi-wavelength noise like light-pulse generator of three annular resonant cavities, characterized in that it includes increasing benefit loop, addedlink loop, gaining loop, mode locking ring and does
Relate to ring, in which: increasing benefit loop, addedlink loop, gaining loop includes the first pumping source, the second pumping source, the first wavelength division multiplexer, the second wavelength division multiplexer, single mode
Er-doped fiber, the first Polarization Controller and the first single mode optical fiber；Mode locking ring includes the one 2 × 2nd coupler, the second Polarization Control
Device, 1 × 2 coupler and isolator；Interference ring include the 22 × 2nd coupler, third Polarization Controller, the second single mode optical fiber and
Bais single-mode；
First pumping source is connect with the end a1 of the first wavelength division multiplexer, the end a3 of the first wavelength division multiplexer and single mode er-doped light
The connection of fine one end, the end a2 of the first wavelength division multiplexer are connect with the first Polarization Controller, the other end of the first Polarization Controller and
The connection of first single mode optical fiber one end, the other end of the first single mode optical fiber are connect with the end c3 of the one 2 × 2nd coupler, single mode er-doped
The optical fiber other end is connect with the end b3 of the second wavelength division multiplexer, the another two port b1 of the second wavelength division multiplexer and the end b2 respectively with
The connection of the end c1 of second pumping source and the one 2 × 2nd coupler, the end c2 of the one 2 × 2nd coupler and the second Polarization Controller connect
Connect, the other end of the second Polarization Controller is connect with the end d1 of the 22 × 2nd coupler, the end d4 of the 22 × 2nd coupler with 1 ×
The end e2 of 2 couplers connects, and the end e1 of 1 × 2 coupler and one end of isolator connect, the isolator other end and the one 2 × 2nd coupling
The end c4 of clutch connects, and as output, the end d2 and d3 of the 22 × 2nd coupler is inclined with third respectively at the end e3 of 1 × 2 coupler
Vibration controller is connected with polarization-maintaining single-mode fiber, and the other end of polarization-maintaining single-mode fiber is connect with the second single mode optical fiber, the second single-mode optics
The fine other end is connect with third Polarization Controller, constitutes the resonant cavity of tricyclic structure.
Beneficial effects of the present invention: present invention employs the resonant cavities of tricyclic structure to realize the output of noise like mode locking pulse,
By the rotation angle of polarization-maintaining single-mode fiber length and change third Polarization Controller in optimization interference ring, largely mention
High output laser stability, improves the stability and flatness of multi-wavelength mode locking pulse, reduces costs, by adjusting the
Three Polarization Controllers change the polarization state of two-way light, and filter peak intensity in interference ring can be changed, so that realization 3 is flat respectively
The generation of wavelength, the generation of 4 flat wavelengths, the generation of 5 flat wavelengths.
The introducing of interference ring effectively optimizes the generation of mode locking pulse light source multi-wavelength, passes through the guarantor in optimization interference ring
Inclined single-mode optical fiber length and the rotation angle for changing third Polarization Controller realize the planarization of multi-wavelength, in monocycle and
In the light-pulse generator of dicyclo resonant cavity, the laser output of flat multi-wavelength is usually realized, relative difficulty needs PC accurate
It adjusts, and more demanding to technique.The structure only passes through addition bais single-mode, third polarizer and the second single mode optical fiber, changes
Third Polarization Controller achieves that flat multiwavelength laser output, easy to operate effective.
It adjusts the first Polarization Controller and the second Polarization Controller realizes the output of noise like mode locking pulse, adjust third polarization
Controller makes output wave long number change, it can be achieved that the flat multi-wavelength of 3 to 5 wavelength exports.
The configuration of the present invention is simple, it is at low cost, can easily be accommodated and be easily integrated, wavelength-division multiplex, Fibre Optical Sensor, optic communication,
The fields such as industrial processes are with good application prospect.
Detailed description of the invention
Fig. 1 is the multi-wavelength plat structure schematic diagram of tricyclic cavity resonator structure noise like light-pulse generator of the present invention.
Fig. 2 is polarization-maintaining single-mode fiber length output light spectrogram when being 1m, side mode suppression ratio 52.22dB, 3dB spectrum width
For 1.7nm.
Fig. 3 is polarization-maintaining single-mode fiber length output light spectrogram when being 2m, wherein (a) is 3 flat wavelength laser outputs
Spectrum, side mode suppression ratio 49.32dB, 3dB spectrum width are 10.92nm；It (b) is 4 flat wavelength laser output spectrums, side
Mould inhibits than being 48.44dB, and 3dB spectrum width is 15.4nm；It (c) is 5 flat wavelength laser output spectrums, side mode suppression ratio is
50.76dB, 3dB spectrum width are 18.42nm.
Fig. 4 (a) is a wide range of auto-correlation mark of noise like mode locking pulse, (b) is the auto-correlation at noise like pulse coherence peak
Mark, pulse 523fs.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention.
As shown in Figure 1, the flat multi-wavelength noise like light-pulse generator of three annular resonant cavities comprising increasing benefit loop, addedlink loop, gaining loop, mode locking ring and
Interference ring.Wherein increasing benefit loop, addedlink loop, gaining loop include the first pumping source 1, the second pumping source 2, the first wavelength division multiplexer 3, the second wavelength division multiplexer 4,
Single mode Er-doped fiber 5, the first Polarization Controller 6 and the first single mode optical fiber 7.Mode locking ring includes that the one 2 × 2nd coupler 8, second is inclined
Shake controller 9,1 × 2 coupler 14 and isolator 15.Interference ring include the 22 × 2nd coupler 10, third Polarization Controller 11,
Second single mode optical fiber 12 and bais single-mode 13.
Each component connection of the light source is all made of fused fiber splice, and increasing benefit loop, addedlink loop, gaining loop is connected by the one 2 × 2nd coupler 8 with mode locking ring
It connects, mode locking ring is connect by the 22 × 2nd coupler 10 with interference ring.Wherein, 980nm the first pumping source 1 and the first wavelength-division multiplex
The end a1 of device 3 connects, and the end a3 of the first wavelength division multiplexer 3 is connect with 5 one end of single mode Er-doped fiber, the first wavelength division multiplexer 3
The end a2 is connect with the first Polarization Controller 6, and the other end of the first Polarization Controller 6 is connect with 7 one end of the first single mode optical fiber, and first
The other end of single mode optical fiber 7 is connect with the end c3 of the one 2 × 2nd coupler 8, and 5 other end of single mode Er-doped fiber and the second wavelength-division are multiple
Connected with the end b3 of device 4, the another two port end b1, b2 of the second wavelength division multiplexer 4 respectively with the second pumping source 2 and the one 2 × 2nd
The end c1 of coupler 8 connects, and the end c2 of the one 2 × 2nd coupler 8 is connect with the second Polarization Controller 9, the second Polarization Controller 9
The other end connect with the end d1 of the 22 × 2nd coupler 10, the e2 at the end d4 of the 22 × 2nd coupler 10 and 1 × 2 coupler 14
End connection, the end e1 of 1 × 2 coupler 14 are connect with one end of isolator 15, and the effect of isolator 15 is to guarantee light from 1 × 2 coupling
The end e1 of clutch 14 to the end c4 of the one 2 × 2nd coupler 8, the end e3 of 1 × 2 coupler 14 is as output, the 21 × 2nd coupler
10 end d2 and d3 is connect with third Polarization Controller 11 and polarization-maintaining single-mode fiber 13 respectively, the other end of polarization-maintaining single-mode fiber 13
It is connect with the second single mode optical fiber 12, the other end of the second single mode optical fiber is connect with third Polarization Controller 11, constitutes tricyclic structure
Resonant cavity.
Wherein, the first pumping source 1 and the second pumping source 2 are 980nm, maximum output 400mW.First wavelength division multiplexer
The end a1, a2, a3 is respectively the end 980nm, the end 1550nm and common end, and the end b1, b2, b3 of the second wavelength division multiplexer is respectively
The end 980nm, the end 1550nm and common end.5 length optimization of single mode Er-doped fiber is 2.5m, corresponding under 400mW pumping condition to turn
It is higher to change efficiency.
The preferred 10m of first single mode optical fiber, 7 length, the second single mode optical fiber 12 are preferably 1m, 13 length model of polarization-maintaining single-mode fiber
Enclosing is 1m~3m, preferably 2m.
In increasing benefit loop, addedlink loop, gaining loop, the first pumping source 1 and the second pumping source 2 are opened, the first pumping is adjusted within the scope of 0mW-400mW
Laser output power can be changed in source 1 and 2 power of the second pumping source.Pump light is multiple by the first wavelength division multiplexer 3 and the second wavelength-division
Single mode Er-doped fiber 5 is injected with device 4,1.55 mu m waveband gain light of generation are through the one 2 × 2nd coupler 8, the second Polarization Controller
9, isolator 15 realizes mode locking, enters interference ring by the 22 × 2nd coupler 10, amplified spontaneous emission light is by the 22 × 2nd coupling
Clutch 10 is divided for the identical two parts of intensity, propagates respectively by the end d2 to the end d3 and the end d3 to the end d2 is propagated, wherein along e2
It holds the light propagated to the end e3 through third Polarization Controller 11, is generated after the second single mode optical fiber 12 and polarization-maintaining single-mode fiber 13 and add phase
Position delay causes the amplified spontaneous emission light after two-way light to generate fixed optical path difference, is formed at the 22 × 2nd coupler 10
Interference, to realize filtering, filtered part broadband light is returned in mode locking ring by the 22 × 2nd coupler 10, thus entire
Persistent oscillation in resonant cavity, general single mode fiber 12 is non-linear in interference ring for enhancing, by using optimization bais single-mode
13 length of optical fiber and the method for changing third Polarization Controller rotation angle, it is defeated to form flat multi-wavelength noise like pulse laser
Out.
Fig. 2 is spectrogram when 13 length of polarization-maintaining single-mode fiber is selected as 1m, and the mode locking pulse generated is not noise like
Pulse, and can not achieve the output of multi-wavelength mode locking pulse by adjusting third Polarization Controller 11.
Fig. 3 (a), (b), (c) are spectrogram when 13 length of polarization-maintaining single-mode fiber is selected as 2m, pass through third Polarization Controller
11 realize the multi-wavelength flat spectrum of Fig. 3 (a), (b), (c), respectively 3 flat wavelength laser output spectrums, i.e. wavelength respectively
Respectively 1552.526nm, 1556.726nm, 1561.166nm, 4 flat wavelength laser output spectrums, i.e. wavelength are respectively
1545.886nm, 1550.626nm, 1555.086nm, 1559.826nm, 5 flat wavelength laser output spectrums, i.e. wavelength point
It Wei not 1544.686nm, 1548.946nm, 1553.566nm, 1558.006nm, 1562.166nm.By adjusting third polarization control
Device 11 processed changes the beam intensity ratio of transmission optical path, interferometer filter peak intensity can be changed, to realize the flat of multi-wavelength.
When Fig. 4 (a) is that 13 length of polarization-maintaining single-mode fiber is selected as 2m, a wide range of auto-correlation mark of noise like mode locking pulse, (b)
For the auto-correlation mark at noise like pulse coherence peak, pulse 532fs.
When 13 length of polarization-maintaining single-mode fiber is selected as 3m, the first Polarization Controller 6, the second Polarization Controller 9, third are adjusted
Polarization Controller 11 can not achieve stable noise like mode locking pulse.
Claims (4)
1. the flat multi-wavelength noise like light-pulse generator of three annular resonant cavities, characterized in that it includes increasing benefit loop, addedlink loop, gaining loop, mode locking ring and interference
Ring, in which: increasing benefit loop, addedlink loop, gaining loop includes the first pumping source (1), the second pumping source (2), the first wavelength division multiplexer (3), the second wavelength-division multiplex
Device (4), single mode Er-doped fiber (5), the first Polarization Controller (6) and the first single mode optical fiber (7)；Mode locking ring includes the one 2 × 2nd coupling
Clutch (8), the second Polarization Controller (9), 1 × 2 coupler (14) and isolator (15)；Interference ring includes the 22 × 2nd coupler
(10), third Polarization Controller (11), the second single mode optical fiber (12) and bais single-mode (13)；
First pumping source (1) is connect with the end a1 of the first wavelength division multiplexer (3), the end a3 of the first wavelength division multiplexer (3) and single mode
The connection of Er-doped fiber (5) one end, the end a2 of the first wavelength division multiplexer (3) are connect with the first Polarization Controller (6), the first polarization control
The other end of device (6) processed is connect with the first single mode optical fiber (7) one end, the other end and the one 2 × 2nd coupling of the first single mode optical fiber (7)
The end c3 of clutch (8) connects, and single mode Er-doped fiber (5) other end is connect with the end b3 of the second wavelength division multiplexer (4), the second wavelength-division
The another two port b1 of multiplexer (4) and the end b2 connect with the end c1 of the second pumping source (2) and the one 2 × 2nd coupler (8) respectively
Connect, the end c2 of the one 2 × 2nd coupler (8) is connect with the second Polarization Controller (9), the other end of the second Polarization Controller (9) with
The end d1 of 22 × 2nd coupler (10) connects, and the end d4 of the 22 × 2nd coupler (10) and the end e2 of 1 × 2 coupler (14) connect
It connects, the end e1 of 1 × 2 coupler (14) is connect with one end of isolator (15), and isolator (15) other end is coupled with the one 2 × 2nd
The end c4 of device (8) connects, and the end e3 of 1 × 2 coupler (14) is as output, the end the d2 and d3 difference of the 22 × 2nd coupler (10)
It is connect with third Polarization Controller (11) and polarization-maintaining single-mode fiber (13), the other end and the second single mode of polarization-maintaining single-mode fiber (13)
Optical fiber (12) connection, the other end of the second single mode optical fiber (12) are connect with third Polarization Controller (11), constitute tricyclic structure
Resonant cavity.
2. the flat multi-wavelength noise like light-pulse generator of three annular resonant cavity according to claim 1, which is characterized in that first
Pumping source (1) and the second pumping source (2) are 980nm, maximum output 400mW.
3. the flat multi-wavelength noise like light-pulse generator of three annular resonant cavity according to claim 1, which is characterized in that first
The end a1, a2, a3 of wavelength division multiplexer (3) is respectively the end 980nm, the end 1550nm and common end, the second wavelength division multiplexer (4)
The end b1, b2, b3 is respectively the end 980nm, the end 1550nm and common end.
4. the flat multi-wavelength noise like light-pulse generator of three annular resonant cavity according to claim 1, which is characterized in that first
Single mode optical fiber (7) length be 10m, the second single mode optical fiber (12) length be 1m, polarization-maintaining single-mode fiber (13) length range be 1m~
3m。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112310794A (en) * | 2020-10-27 | 2021-02-02 | 合肥脉锐光电技术有限公司 | Higher harmonic mode-locked laser based on optical fiber coupler |
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| CN103296567A (en) * | 2013-06-08 | 2013-09-11 | 长春理工大学 | Ultra-narrow-linewidth nonlinear gain amplification multi-wavelength fiber laser |
| CN104577675A (en) * | 2014-12-30 | 2015-04-29 | 长春理工大学 | Linear-cavity multi-wavelength Tm-doped optical fiber laser based on M-Z interferometer |
| KR20170052332A (en) * | 2015-11-04 | 2017-05-12 | 한국기계연구원 | Pulse generating apparatus having interferometer for selectively generating mode-locked pulse and noise like pulse |
| CN107039876A (en) * | 2017-06-26 | 2017-08-11 | 电子科技大学 | The dual wavelength thulium-doped fiber laser that noise like and high-frequency harmonic locked mode coexist |
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2019
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| CN103296567A (en) * | 2013-06-08 | 2013-09-11 | 长春理工大学 | Ultra-narrow-linewidth nonlinear gain amplification multi-wavelength fiber laser |
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| KR20170052332A (en) * | 2015-11-04 | 2017-05-12 | 한국기계연구원 | Pulse generating apparatus having interferometer for selectively generating mode-locked pulse and noise like pulse |
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| CN112310794A (en) * | 2020-10-27 | 2021-02-02 | 合肥脉锐光电技术有限公司 | Higher harmonic mode-locked laser based on optical fiber coupler |
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Application publication date: 20190614 |