CN1909306A - '8' character cavity passive mode-locking pulse optical fibre laser - Google Patents
'8' character cavity passive mode-locking pulse optical fibre laser Download PDFInfo
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- CN1909306A CN1909306A CN 200610105091 CN200610105091A CN1909306A CN 1909306 A CN1909306 A CN 1909306A CN 200610105091 CN200610105091 CN 200610105091 CN 200610105091 A CN200610105091 A CN 200610105091A CN 1909306 A CN1909306 A CN 1909306A
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Abstract
The invention relates to an 8-shaped passive lock mode impulse fiber laser, wherein another end of central coupler is connected to the polarization controller, the wavelength division multiplexer, the yttrium doping fiber, the light separator and the coupler, to form chamber; the non-linear light annular mirror is formed by connected single-mode fiber and coupler to form chamber; the couple input of wavelength division multiplexer has pump source. The invention has low impulse energy fluctuation and low cost. And the coupler is asymmetry arranged near the central coupler; and the annular mirror uses same fibers; the light transmitted reversed has different density after coupler to the light not passing coupler, and the non-linear phase shifts are different; and lights transmitted with same direction have same density when interfered in central coupler, therefore, the lock-mode effect is better.
Description
Technical field
The present invention proposes a kind of nonlinear optical loop mirror scheme, relate to a kind of mode locking pulse fiber laser, specifically is a kind of " 8 " word chamber passive mode locking pulse optical fiber.
Background technology
Plurality of advantages such as fiber laser is little with volume, light-phototranstormation efficiency height, good stability and be widely studied application are especially to mix Er
3+Fiber laser and amplifier are in the majority.Fiber laser can be F-P chamber, ring-like chamber and " 8 " word chamber etc.
" 8 " word chamber mode locking pulse fiber laser has two kinds of basic structures: non-linear amplification annular mirror (NALM) type mode locking pulse fiber laser and nonlinear optical loop mirror (NOLM) type mode locking pulse fiber laser.In traditional " NOLM " type mode locking pulse fiber laser, it is that similar same model optical fiber or chromatic dispersion parameter substantially equally get optical fiber that central coupler (Central coupler) adopts non-three-dB coupler, its optical fiber; Adopt in the mode locking pulse fiber laser of chromatic dispersion lack of balance optics annular mirror (DI-NOLM), its central coupler is a three-dB coupler, and its optical fiber adopts inhomogeneous optical fiber.Adopt the result of interference of three-dB coupler better, so use the NOLM type fiber laser of three-dB coupler to have better mode-lock status.
Referring to Fig. 1, mainly there is following shortcoming in traditional nonlinear optical loop mirror:
1. central coupler can only be non-three-dB coupler, when two-beam when central coupler is interfered because the intensity difference of two-beam makes interference effect bad, therefore when being used for locked mode, the pulse energy big rise and fall behind the locked mode, mode-lock status is bad.
2. what nonlinear optical loop mirror adopted is identical optical fiber of the same race of chromatic dispersion parameter or the less optical fiber of dispersion measure difference, when central coupler adopts three-dB coupler, because nonlinear optical loop mirror is in the state of total reflection, therefore can't be used for the mode locking pulse fiber laser.
Referring to Fig. 2, mainly there is following shortcoming in chromatic dispersion lack of balance optics annular mirror (DI-NOLM):
1. when being used for the mode locking pulse fiber laser,, adopted monomode fiber (SMF) and one section dispersion shifted optical fiber (DSF) of one section high chromatic dispersion in the ring with low chromatic dispersion though central coupler can adopt three-dB coupler.Owing to adopted two kinds of different optical fiber, so cost height.
2. in mixing ytterbium mode locking pulse fiber laser, owing to there is not dispersion shifted single mode fiber corresponding to the ytterbium ion emission band, though the central coupler of chromatic dispersion lack of balance optics annular mirror can adopt three-dB coupler, can't be used for mixing ytterbium mode locking pulse fiber laser.
Summary of the invention
The object of the present invention is to provide a kind of " 8 " word chamber passive mode locking pulse optical fiber, its traditional nonlinear optical loop mirror that has solved the pulse energy big rise and fall behind the locked mode in the background technology, cost height and employing 3dB central coupler can't be used for the technical problem of " 8 " word chamber mode locking pulse fiber laser.
Technical solution of the present invention is:
A kind of " 8 " word chamber passive mode locking pulse optical fiber, comprise nonlinear optical loop mirror 3, described nonlinear optical loop mirror 3 comprises the monomode fiber 2 that connects into cavity, one is terminated at the central coupler at monomode fiber 2 two ends, and its special character is: described nonlinear optical loop mirror 3 also comprises the coupler 9 that is serially connected with in monomode fiber 2 paths; The other end of described central coupler 1 is connected with Polarization Controller 7, wavelength division multiplexer 5, Yb dosed optical fiber 12, optical isolator 11, the coupler 10 that is concatenated into cavity in turn by monomode fiber 8, and the couple input of described wavelength division multiplexer 5 is provided with pumping source 6.
Above-mentioned optical isolator 11 is simpler with the optical isolator structure that adopts the magnetic tape trailer fibre.
Above-mentioned optical isolator 11 can adopt the polarization sensitive isolator or the polarization insensitive isolator of magnetic tape trailer fibre according to the concrete needs of implementing.
Above-mentioned central coupler 1 is advisable to adopt three-dB coupler.
It is good more that the splitting ratio of above-mentioned central coupler 1 levels off to 50: 50 interference effects more.
Above-mentioned coupler 9 is asymmetric setting.
Above-mentioned Polarization Controller 7 can adopt at the line style optical fiber polarization controller.
Monomode fiber in the above-mentioned nonlinear optical loop mirror 3 can be only be made of the monomode fiber 2 of high chromatic dispersion, also can be made of monomode fiber 2 and one section single mode dispersion shifted optical fiber 4 with low chromatic dispersion of one section high chromatic dispersion.
The present invention has the following advantages:
Central coupler of the present invention adopts three-dB coupler, and with the asymmetrical position that is placed near central coupler of fiber coupler in the nonlinear optical fiber annular mirror, whole nonlinear optical loop mirror adopts similar same model optical fiber or the little optical fiber of chromatic dispersion parameter difference.Because the asymmetric placement of the fiber coupler in the nonlinear optical fiber annular mirror, therefore the light of transmission can obtain different nonlinear phase shifts through transmission is different without the luminous intensity of overcoupling device behind the coupler with clockwise counterclockwise.And the intensity of light when central coupler is interfered that two bundles transmit in opposite directions is identical, therefore can obtain the better locked mode of effect.
1. intensity is identical when interfering owing to two-beam, and interference effect is good, and when therefore being used for the mode locking pulse fiber laser, the pulse energy behind the locked mode rises and falls very little, and mode-lock status is good.
2. central coupler can adopt three-dB coupler, and can adopt the optical fiber or the little optical fiber of chromatic dispersion parameter difference of chromatic dispersion parameter of the same race in the ring, not only can be used for mixing in the ytterbium mode locking pulse fiber laser, and cost is lower.
3. adopted a coupler in the ring of nonlinear optical loop mirror, therefore the light of transmission, can obtain different nonlinear phase shifts through transmission is different without the luminous intensity of overcoupling device behind the coupler with clockwise counterclockwise.And the intensity of light when central coupler is interfered that two bundles transmit in opposite directions is identical, so both guaranteed the switch effect of nonlinear optical loop mirror, guaranteed again because the good interference effect that when interfering, forms owing to two-beam intensity is identical, thus the better locked mode of acquisition effect.
4. compact conformation of the present invention, stable performance, spectrum continuously-tuning.
Description of drawings
The structural representation of Fig. 1 tradition nonlinear optical loop mirror;
Fig. 2 is the structural representation of the existing non-equilibrium optics annular mirror of chromatic dispersion;
Fig. 3 is a structural representation of the present invention;
Fig. 4 (a, b, c, d, e, f) is the continuously adjustable locked mode output spectrum figure of the present invention's different centre wavelengths in tuning;
Fig. 5 is mode locking pulse figure of the present invention;
Fig. 6 is mode locking pulse autocorrelator trace figure of the present invention.
Drawing reference numeral explanation: 1-central coupler, 2-monomode fiber, 3-nonlinear optical loop mirror, 4-dispersion shifted optical fiber, the 5-wavelength division multiplexer, 6-pumping source, 7-Polarization Controller, 8-monomode fiber, the 9-coupler, 10-coupler, 11-optical isolator, 12-Yb dosed optical fiber.
Embodiment
Referring to Fig. 3, the present invention is the vibration chamber that Yb dosed optical fiber 12, optical isolator 11, coupler 10, nonlinear optical loop mirror 3 and Polarization Controller 7 are connected and composed successively by monomode fiber 8.Nonlinear optical loop mirror 3 connects coelosis by central coupler 1, coupler 9 by monomode fiber 2 and constitutes.
The pumping laser that pumping source 6 sends is coupled into the vibration chamber through wavelength division multiplexer 5.Central coupler 1 of the present invention can adopt three-dB coupler.Nonlinear optical loop mirror 3 can only adopt monomode fiber 2, also can be made of jointly monomode fiber 2 and one section dispersion shifted optical fiber 4 with low chromatic dispersion of one section high chromatic dispersion.The end of chromatic dispersion lack of balance optics annular mirror type fiber laser pulse laser from central coupler 1 entered, be divided into two bundles that intensity equates, a branch of light of transmission is through the very fast broadening of monomode fiber 2 effects of high chromatic dispersion clockwise, therefore peak power also and then descends, the light of transmission is because the chromatic dispersion of dispersion shifted optical fiber 4 is little counterclockwise, therefore in dispersion shifted optical fiber 4, still keep narrow pulsewidth, and in monomode fiber 2, obtain very big phase shift, when the two-beam phase difference of transmission in opposite directions equaled π, pulse obtained maximum transmissivity.
Coupler 9 of the present invention asymmetric placement in nonlinear optical loop mirror, like this, two bundles in opposite directions the light of transmission in transmission because the intensity difference, can obtain different phase shifts, make nonlinear optical loop mirror have good switch effect, intensity is identical in the time of simultaneously can guaranteeing to demonstrate,prove this two-beam and interfere at central coupler 1 place, thereby makes the present invention can obtain better locked mode.Central coupler 1 splitting ratio can obtain more superior interference effect more more near 50: 50.But for traditional nonlinear optical loop mirror, when splitting ratio during at 50: 50, because the phase shift that obtains of the two-beam of transmission is identical in opposite directions, the transmissivity of nonlinear optical loop mirror 3 is 0, therefore can't be applied to the mode locking pulse fiber laser.Promptly when adopting same model optical fiber in traditional nonlinear optical loop mirror 3 or during the close optical fiber of chromatic dispersion parameter, nonlinear optical loop mirror 3 is transmitted light not.Optical isolator 11 can adopt polarization sensitive isolator, also can adopt the polarization insensitive isolator.
In experiment of the present invention, it is the LD pump light source of 976nm that pumping source 6 adopts emission band, monomode fiber output; Wavelength division multiplexer 5 adopts 980nm/1053nm WDM; Yb dosed optical fiber 12 adopts single mode to mix Yb
3+Optical fiber, core diameter 6.2 μ m; The splitting ratio of central coupler 1 is 50: 50, and monomode fiber 2 adopts the common silica fiber (Lucent 980 fiber) of 40m; It is the optical isolator of the magnetic tape trailer fibre of 1053nm that optical isolator 11 adopts centre wavelength, with the reverberation that suppresses to come out, make light unidirectional operation in the ring that constitutes by Polarization Controller 7, monomode fiber 8, wavelength division multiplexer 5, Yb dosed optical fiber 12, optical isolator 11, coupler 10 among the present invention from central coupler 1; Polarization Controller 7 adopts at the line style optical fiber polarization controller, is used for regulating transmission polarization state of light and laser chamber internal loss in the optical fiber, unites adjusting and can impel " 8 " font cavity optical fibre laser thoroughly to interfere locked mode, makes centre wavelength tunable simultaneously.Coupler 10 can adopt 99: 1 coupler in the experiment, 9 couplers that can adopt 92: 8 of coupler.
Fig. 4 (a, b, c, d, e, f) is the continuously adjustable locked mode output spectrum figure of the present invention's different centre wavelengths in tuning; Fig. 5 is mode locking pulse figure of the present invention; Fig. 6 is mode locking pulse autocorrelator trace figure of the present invention.
Claims (8)
1. " 8 " word chamber passive mode locking pulse optical fiber, comprise nonlinear optical loop mirror (3), described nonlinear optical loop mirror (3) comprises the monomode fiber (2) that connects into cavity, one is terminated at the central coupler at monomode fiber (2) two ends, it is characterized in that: described nonlinear optical loop mirror (3) also comprises the coupler (9) that is serially connected with in monomode fiber (2) path; The other end of described central coupler (1) is connected with Polarization Controller (7), wavelength division multiplexer (5), Yb dosed optical fiber (12), optical isolator (11) and the coupler (10) that is concatenated into cavity in turn by monomode fiber (8), and the couple input of described wavelength division multiplexer (5) is provided with pumping source (6).
2. " 8 " according to claim 1 word chamber passive mode locking pulse optical fiber, it is characterized in that: described optical isolator (11) is the optical isolator of magnetic tape trailer fibre.
3. " 8 " according to claim 1 word chamber passive mode locking pulse optical fiber is characterized in that: described optical isolator (11) is the polarization sensitive isolator or the polarization insensitive isolator of magnetic tape trailer fibre.
4. according to one of claim 1-3 described " 8 " word chamber passive mode locking pulse optical fiber, it is characterized in that: described central coupler (1) is a three-dB coupler.
5. " 8 " according to claim 4 word chamber passive mode locking pulse optical fiber, it is characterized in that: the splitting ratio of described central coupler (1) leveled off to 50: 50.
6. " 8 " according to claim 5 word chamber passive mode locking pulse optical fiber, it is characterized in that: the setting of described coupler (9) is asymmetric.
7. " 8 " according to claim 6 word chamber passive mode locking pulse optical fiber, it is characterized in that: described Polarization Controller (7) is at the line style optical fiber polarization controller.
8. " 8 " according to claim 7 word chamber passive mode locking pulse optical fiber is characterized in that: the monomode fiber in the described nonlinear optical loop mirror (3) only is made of the monomode fiber (2) of high chromatic dispersion; Or the monomode fiber of described nonlinear optical loop mirror (3) is by monomode fiber (2) and one section dispersion shifted optical fiber (4) formation that has than low chromatic dispersion of one section high chromatic dispersion.
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| CN 200610105091 CN1909306A (en) | 2006-09-01 | 2006-09-01 | '8' character cavity passive mode-locking pulse optical fibre laser |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102243412A (en) * | 2011-06-14 | 2011-11-16 | 华东师范大学 | All-optical-fiber wavelength conversion method |
| CN101771232B (en) * | 2008-12-31 | 2012-07-11 | 中国科学院西安光学精密机械研究所 | Sigma cavity ultrashort pulse fiber laser with variable output rate |
| CN109361145A (en) * | 2018-12-24 | 2019-02-19 | 佛山科学技术学院 | Single wavelength is tunable Q-switch and mode-locking pulse laser |
| CN109507684A (en) * | 2018-12-18 | 2019-03-22 | 华中科技大学 | High spatial resolution detection system and detection method based on noise like pulse |
| CN110323661A (en) * | 2019-07-16 | 2019-10-11 | 桂林电子科技大学 | A kind of multi-wavelength optical fiber laser at four times of Brillouin shift frequency wavelengths interval |
| CN110459941A (en) * | 2019-07-30 | 2019-11-15 | 华南理工大学 | A kind of 8 word chamber orbital angular momentum mode mode locked fiber lasers |
| CN111562652A (en) * | 2020-04-29 | 2020-08-21 | 中国科学院西安光学精密机械研究所 | Dual-input dual-output optical switch based on synthetic optical grid |
-
2006
- 2006-09-01 CN CN 200610105091 patent/CN1909306A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771232B (en) * | 2008-12-31 | 2012-07-11 | 中国科学院西安光学精密机械研究所 | Sigma cavity ultrashort pulse fiber laser with variable output rate |
| CN102243412A (en) * | 2011-06-14 | 2011-11-16 | 华东师范大学 | All-optical-fiber wavelength conversion method |
| CN109507684A (en) * | 2018-12-18 | 2019-03-22 | 华中科技大学 | High spatial resolution detection system and detection method based on noise like pulse |
| CN109507684B (en) * | 2018-12-18 | 2020-05-19 | 华中科技大学 | High spatial resolution detection system and detection method based on noise-like pulses |
| CN109361145A (en) * | 2018-12-24 | 2019-02-19 | 佛山科学技术学院 | Single wavelength is tunable Q-switch and mode-locking pulse laser |
| CN109361145B (en) * | 2018-12-24 | 2023-12-01 | 佛山科学技术学院 | Single-wavelength tunable Q-mode locking pulse laser |
| CN110323661A (en) * | 2019-07-16 | 2019-10-11 | 桂林电子科技大学 | A kind of multi-wavelength optical fiber laser at four times of Brillouin shift frequency wavelengths interval |
| CN110459941A (en) * | 2019-07-30 | 2019-11-15 | 华南理工大学 | A kind of 8 word chamber orbital angular momentum mode mode locked fiber lasers |
| CN110459941B (en) * | 2019-07-30 | 2021-01-19 | 华南理工大学 | 8-shaped cavity orbital angular momentum mode-locked fiber laser |
| CN111562652A (en) * | 2020-04-29 | 2020-08-21 | 中国科学院西安光学精密机械研究所 | Dual-input dual-output optical switch based on synthetic optical grid |
| CN111562652B (en) * | 2020-04-29 | 2021-03-30 | 中国科学院西安光学精密机械研究所 | Dual-input dual-output optical switch based on synthetic optical grid |
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