CN109038188B - Erbium-doped fiber laser and adjusting method - Google Patents
Erbium-doped fiber laser and adjusting method Download PDFInfo
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- CN109038188B CN109038188B CN201810832004.4A CN201810832004A CN109038188B CN 109038188 B CN109038188 B CN 109038188B CN 201810832004 A CN201810832004 A CN 201810832004A CN 109038188 B CN109038188 B CN 109038188B
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- 239000000835 fiber Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000010287 polarization Effects 0.000 claims abstract description 53
- 239000013307 optical fiber Substances 0.000 claims abstract description 13
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 description 8
- 230000002547 anomalous effect Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06725—Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10061—Polarization control
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
- H01S3/1109—Active mode locking
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention discloses an erbium-doped fiber laser, which comprises a wavelength division multiplexing coupler, an erbium-doped gain fiber, a first polarization controller, an isolator, a polarizer, an output coupler, a second polarization controller and a pumping source; the output end of the pumping source is connected with the input end of the wavelength division multiplexing coupler, and the wavelength division multiplexing coupler, the erbium-doped gain fiber, the first polarization controller, the isolator, the polarizer, the output coupler and the second polarization controller are sequentially connected into an optical fiber annular cavity through single-mode fibers. Also disclosed is a method of adjusting an erbium-doped fiber laser. The invention can realize pulse output with center wavelength larger than 1610 nm.
Description
Technical Field
The invention relates to an erbium-doped fiber laser and an adjusting method, in particular to an erbium-doped fiber laser with a center wavelength larger than 1610nm and an adjusting method, and belongs to the technical field of fiber communication.
Background
The L-band refers to the laser band of wavelengths 1565 nm through 1625 nm, and is widely used in fiber optic communication systems because glass fibers have very low losses in this band. Particularly, the ultra-fast femtosecond laser has wide application requirements in the aspects of high-capacity high-speed optical information transmission, biomedical detection and scientific research application due to the extremely high time resolution.
The erbium-doped fiber laser can work in the L wave band, but due to the long wavelength attenuation of the gain, the erbium-doped fiber laser generally works in the 1550-1580nm wave band, and the upper limit of the laser wavelength of most lasers working in the L wave band is 1600nm. Different application contexts have different requirements for the wavelength position of the ultrafast laser. Meanwhile, the erbium-doped optical fiber is considered to be the only gain medium of the L wave band, so that the ultra-fast output of the laser light source in the L wave band, particularly the wave band with the wavelength larger than 1610nm, can be realized, the application field and the direction of the laser light source can be expanded, and meanwhile, the cost of the laser can be greatly reduced, and the method has important significance in the aspects of application and industry. Mode-locked pulses with wavelengths greater than 1610nm have not been achieved in the ultra-fast erbium-doped fiber lasers reported so far.
Disclosure of Invention
The invention provides an erbium-doped fiber laser and an adjusting method, which solve the problem that the traditional fiber laser does not realize mode locking pulse with wavelength longer than 1610 nm.
In order to solve the technical problems, the invention adopts the following technical scheme:
An erbium-doped fiber laser comprises a wavelength division multiplexing coupler, an erbium-doped gain fiber, a first polarization controller, an isolator, a polarizer, an output coupler, a second polarization controller and a pump source; the output end of the pumping source is connected with the input end of the wavelength division multiplexing coupler, and the wavelength division multiplexing coupler, the erbium-doped gain fiber, the first polarization controller, the isolator, the polarizer, the output coupler and the second polarization controller are sequentially connected into an optical fiber annular cavity through single-mode fibers.
The erbium-doped gain fiber is normally dispersive, and the rest fiber is abnormally dispersive.
The gain curve of the erbium-doped gain fiber covers the L-band, and the emission peak of the L-band is higher than 0dB/m.
The length of the erbium-doped gain fiber is determined by the absorption coefficient, and the larger the absorption coefficient is, the shorter the length is.
The length of the erbium-doped gain fiber is greater than 9 meters.
The length of the single-mode optical fiber is more than 74 meters
A method for adjusting an erbium-doped fiber laser includes,
Resetting the second polarization controller, and adjusting the first polarization controller to realize mode locking;
The second polarization controller is adjusted to achieve a center wavelength of the output pulse greater than 1610nm.
The invention has the beneficial effects that: 1. the invention can realize the pulse output with the center wavelength larger than 1610nm by adjusting the polarization controller; 2. the erbium-doped gain optical fiber is normal dispersion, other optical fibers are anomalous dispersion, after the mode locking state in the cavity is adjusted, the birefringence in the cavity is kept unchanged, and the mode locking state can be automatically realized along with the lifting of pumping power from zero; 3. the invention realizes the physical separation of mode locking and wavelength selection by adopting two groups of polarization controllers.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a spectrum of an output pulse of the present invention;
FIG. 3 is an autocorrelation graph of an output pulse of the present invention;
FIG. 4 is a spectrum of an output noise-like pulse of the present invention;
fig. 5 is a pulse sequence of the output noise-like pulses of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
As shown in fig. 1, an erbium-doped fiber laser includes a wavelength division multiplexing coupler WDM, an erbium-doped gain fiber EDF, a first polarization controller PC1, an isolator Isolator, a polarizer P, an output coupler output, a second polarization controller PC2, and a pump source LD.
The output end of the pumping source LD is connected with the input end of a wavelength division multiplexing coupler WDM, the wavelength division multiplexing coupler WDM, an erbium-doped gain fiber EDF, a first polarization controller PC1, an isolator Isolator, a polarizer P, an output coupler output and a second polarization controller PC2 are sequentially connected into an optical fiber annular cavity through a single-mode optical fiber.
The pump source LD was counter-pumped with 976nm single-mode diodes with an average power of 750 mW.
The type of single mode fiber is SMF28e+ and must be greater than 74 meters in length, which is anomalous dispersion.
The erbium-doped gain fiber EDF is normal dispersion, the gain curve covers the L wave band, the emission peak of the L wave band is higher than 0dB/m, the length of the erbium-doped gain fiber EDF is determined by the absorption coefficient, the larger the absorption coefficient is, the shorter the length is, and the specific length is required to be larger than 9 meters in order to provide enough gain. The erbium-doped gain fiber EDF larger than 9m and the single-mode fiber larger than 74 m effectively ensure that the bandwidth of the birefringent filter in the optical fiber annular cavity formed by the combined action of the polarizer P and the second polarization controller PC2 is larger than 10nm near 1610 nm.
In practical design, other parameters of the erbium-doped gain fiber EDF can be adjusted according to practical situations, and a set of example parameters are given as follows: the EDF absorption peak of the erbium-doped gain fiber is 1525 nm-1535 nm, the absorption coefficient is 80dB/m, the numerical aperture is 0.29, the mode field diameter at 1550 nm wavelength is 4.3 μm, and the dispersion coefficient at 1550 nm wavelength is-48 ps/(nm.km).
The isolator Isolator, polarizer P and output coupler output are fiber-based isolator Isolator, polarizer P and output coupler output, respectively.
The first polarization controller PC1 and the second polarization controller PC2 may be paddle polarization controllers or squeeze polarization controllers.
The repetition frequency of the erbium-doped fiber laser is 2.4MHz, the average power is 20mW, and the self-starting mode locking is achieved by adopting a nonlinear polarization rotation technology.
According to the adjusting method of the erbium-doped fiber laser, the second polarization controller PC2 is reset, the first polarization controller PC1 is adjusted to achieve mode locking, and then the second polarization controller PC2 achieves that the central wavelength of output pulses is larger than 1610nm. The specific process is as follows:
1) Resetting the second polarization controller PC2, and adjusting the extrusion button to be not extruded if the second polarization controller PC is an extrusion type polarization controller, wherein the rotating block does not rotate; if the polarization controller is a paddle type polarization controller, the paddle is adjusted to be horizontal; the pulse is changed into linear polarized light after passing through the polarizer P, and then is changed into amplified elliptical polarized light after passing through the isolator Isolator and the erbium-doped gain fiber EDF, and the ellipsoidal direction of the elliptical polarized light can be adjusted by adjusting the introduced polarization amount of the first polarization controller PC 1.
2) The polarization direction of the pulse is rotated to different degrees after the pulse is transmitted, and the polarization direction of the pulse is consistent with the polarization direction of the polarizer P by adjusting the first polarization controller PC1, so that the pulse forms oscillation in the optical fiber annular cavity through the polarizer P, namely, the mode locking is generated, and in general, the mode locking is self-starting mode locking: keeping the intra-cavity birefringence state unchanged, mode locking can occur automatically as the pump source LD power increases from zero.
3) The second polarization controller PC2 and the polarizer P jointly act to form a double-refraction filter in the optical fiber annular cavity, the spectral position of output pulse can be adjusted by adjusting the introduced polarization amount of the second polarization controller PC2, and effective gain filtering is formed at 1610nm, so that pulse output with the center wavelength larger than 1610nm is realized.
In the erbium-doped fiber laser, by adjusting the blade of the second polarization controller PC2, ultra-short pulses with a spectral width of 2.3nm can be formed at 1613.6nm as shown in fig. 2, and fig. 3 is a graph of autocorrelation of the output pulses, where the autocorrelation graph corresponds to a pulse width of 1.9ps. The erbium-doped fiber laser can also form a noise-like pulse output corresponding to the other polarization amounts of the first polarization controller PC1, the spectrum of which is shown in fig. 4, and the corresponding pulse sequence of which is shown in fig. 5.
The invention adopts the cavity design of dispersion management composed of gain fiber with normal dispersion and single mode fiber with anomalous dispersion, and realizes the self-starting mode locking of the laser by utilizing nonlinear polarization rotation technology, meanwhile, the polarizer and the polarization controller of the invention jointly act to form a birefringent filter in the fiber annular cavity, and pulse output with central wavelength larger than 1610nm can be realized by adjusting the polarization controller, and the physical separation of mode locking and wavelength selection is realized.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (1)
1. An erbium-doped fiber laser, characterized in that: the device comprises a wavelength division multiplexing coupler, an erbium-doped gain fiber, a first polarization controller, an isolator, a polarizer, an output coupler, a second polarization controller and a pump source; the output end of the pumping source is connected with the input end of the wavelength division multiplexing coupler, and the wavelength division multiplexing coupler, the erbium-doped gain fiber, the first polarization controller, the isolator, the polarizer, the output coupler and the second polarization controller are sequentially connected into an optical fiber annular cavity through single-mode fibers;
in the erbium-doped fiber laser, the erbium-doped gain fiber is normally dispersed, and the other fibers are abnormally dispersed;
in the erbium-doped fiber laser, the gain curve of the erbium-doped gain fiber covers an L wave band, and the emission peak of the L wave band is higher than 0dB/m;
in the erbium-doped fiber laser, the length of the erbium-doped gain fiber is determined by the absorption coefficient, and the larger the absorption coefficient is, the shorter the length is;
in the erbium-doped fiber laser, the length of the erbium-doped gain fiber is more than 9 meters;
The length of the single-mode optical fiber is more than 74 meters;
the adjusting method of the erbium-doped fiber laser comprises the following steps: resetting the second polarization controller, and adjusting the first polarization controller to realize mode locking; the second polarization controller is adjusted to achieve a center wavelength of the output pulse greater than 1610nm.
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| CN201810832004.4A CN109038188B (en) | 2018-07-26 | 2018-07-26 | Erbium-doped fiber laser and adjusting method |
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| CN201810832004.4A CN109038188B (en) | 2018-07-26 | 2018-07-26 | Erbium-doped fiber laser and adjusting method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109936044A (en) * | 2019-04-25 | 2019-06-25 | 长春理工大学 | A kind of tunable mode-locked optical fiber laser |
| CN110112639A (en) * | 2019-04-30 | 2019-08-09 | 南京邮电大学 | All -fiber mode-locked laser based on the micro-nano fiber polarizer |
| CN110649452A (en) * | 2019-09-27 | 2020-01-03 | 北京航空航天大学 | High-power wavelength-adjustable all-fiber nanosecond pulse laser and system |
| CN112234423B (en) * | 2020-10-14 | 2022-01-28 | 江苏师范大学 | Dual-wavelength mode-locked fiber laser with wavelength interval exceeding 50 nanometers and dual-wavelength mode-locked laser output generation method |
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