CN215955685U - Pulse optical fiber laser device - Google Patents
Pulse optical fiber laser device Download PDFInfo
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- CN215955685U CN215955685U CN202122287363.6U CN202122287363U CN215955685U CN 215955685 U CN215955685 U CN 215955685U CN 202122287363 U CN202122287363 U CN 202122287363U CN 215955685 U CN215955685 U CN 215955685U
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Abstract
The utility model relates to a pulse fiber laser device, which comprises a laser seed light source, a pulse laser, a pulse signal light source and a pulse signal light source, wherein the laser seed light source emits pulse signal light; the multimode pump laser emits pump light; the low-doped erbium-ytterbium double-clad active fiber, the multimode pump bridge and the high-doped erbium-ytterbium double-clad active fiber are sequentially connected; the multimode pump bridge separates pump light from signal light; the high-reflection fiber grating filters and reflects the signal light; the low-reflection fiber grating reflects part of signal light into the highly doped erbium-ytterbium double-clad active fiber and amplifies the signal light; and the reflection grating reflects part of the pump light into the highly doped erbium-ytterbium double-clad active fiber, and transmits other part of the pump light into the lowly doped erbium-ytterbium double-clad active fiber. By adopting the pulse fiber laser device, the production time is shortened to half of that of the traditional pre-amplification two-stage scheme, the production efficiency is greatly improved, the labor cost of the laser is reduced, the cost of components is greatly reduced, the commercial batch use is facilitated, and the pulse fiber laser device has ultrahigh reliability.
Description
Technical Field
The utility model relates to the field of pulse fiber lasers, in particular to the field of main oscillation power amplification fiber lasers, and specifically relates to a pulse fiber laser device.
Background
The pulse Main Oscillation Power Amplifier (MOPA) fiber laser has the advantages of high peak power, good beam quality and the like, so that the pulse Main Oscillation Power Amplifier (MOPA) fiber laser is widely applied to the fields of laser radar, laser ranging, laser mapping and the like. However, since the seed light source in the MOPA laser is usually obtained by directly modulating the seed light source into nanosecond pulses through a circuit, the output power of the seed light is only about hundreds of picojoules. If erbium ytterbium co-doped double clad fiber (EYDCF) is directly used for amplifying the seed optical power, a large amount of ASE is easily generated, and the amplification effect is poor. In addition, the EYDCF sub-unit 1530NM has very high absorption and radiation coefficients, so that the MOPA laser is easy to cause the self-radiated emission (ASE) power at 1530NM to be increased and the signal-to-noise ratio (OSNR) of the signal light to be reduced under the condition of high-power pumping, and on the other hand, the extremely high ASE energy density at 1530NM is easy to cause the self-excitation effect of the ASE signal light and the jitter of the spectrum and the output light power.
In order to obtain high peak power and high signal-to-noise ratio, people usually use an erbium-doped fiber amplifier as the first stage of amplification, and after amplifying the seed to a certain power, the seed is input into EYDCF to perform high-power amplification. Although the method can obtain high-quality laser output, the EDFA complete set of optical fiber components and the pump laser are single-mode components, and the method has the defects of high cost, large size of the components, large quantity and the like. The cost is doubled, the production efficiency is directly influenced, the mass production is restricted, and in addition, more devices bring great restrictions on the reliability and the compactness of the equipment structure. This is contrary to the requirements of high output power and signal-to-noise ratio, high production efficiency, low cost, compact structure and high reliability.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a pulse optical fiber laser device which has high production efficiency, low cost and compact structure.
In order to achieve the above object, a pulse fiber laser device according to the present invention comprises:
the pulse fiber laser device is mainly characterized in that the device comprises:
a laser seed light source that emits pulse signal light;
a multimode pump laser emitting pump light;
the low-doped erbium-ytterbium double-clad active optical fiber is connected with the laser seed light source;
the highly doped erbium-ytterbium double-clad active fiber is connected with the multimode pump laser;
the multimode pump bridge is connected between the low-doped erbium-ytterbium double-clad active fiber and the high-doped erbium-ytterbium double-clad active fiber, and is used for separating pump light and signal light;
the high-reflectivity fiber grating is connected with the high-doped erbium-ytterbium double-clad active fiber;
the low-reflection fiber grating is connected with the high-reflection fiber grating and the multimode pump laser;
and the reflection grating is connected with the multimode pump bridge, the low-doped erbium-ytterbium double-clad active fiber and the high-doped erbium-ytterbium double-clad active fiber, reflects part of the pump light into the high-doped erbium-ytterbium double-clad active fiber, and transmits the other part of the pump light into the low-doped erbium-ytterbium double-clad active fiber.
Preferably, the device further comprises an optical circulator connected with the laser seed light source and the low doped erbium ytterbium double-clad active fiber.
Preferably, the device further comprises:
the separator is connected with the optical circulator;
and the output port is connected with the separator and is used as an output port of the laser.
Preferably, the device further comprises a fiber junction connected to the low doped erbium ytterbium double-clad active fiber and the high doped erbium ytterbium double-clad active fiber.
Preferably, the low reflection fiber grating adopts a 6nm broadband grating.
Preferably, the high-reflectivity fiber grating and the low-reflectivity fiber grating are both arranged inside the fiber core of the active optical fiber through laser direct etching.
By adopting the pulse fiber laser device, ultrahigh output power and optical spectrum OSNR can be obtained, and the adoption of the traditional EDFA as a two-stage structure of pre-amplification and power amplification is avoided. The fiber laser amplification design can be completed by a very simple optical path design scheme: only three passive optical devices are used in the optical path scheme. The extremely simple light path structure enables the production time of the optical fiber laser to be shortened to half of that of a traditional pre-amplification two-stage scheme, greatly improves the production efficiency and reduces the labor cost of the laser. The extremely simple optical path structure enables the cost of components of the optical fiber laser to be greatly low, and compared with the traditional solution, the cost is reduced by more than half. The laser can be integrated into a subminiature structure, is convenient for commercial batch use and has ultrahigh reliability.
Drawings
Fig. 1 is a schematic structural diagram of a pulse fiber laser device according to the present invention.
Fig. 2 is a schematic diagram of the structure of an optical fiber of the pulse fiber laser device of the present invention.
Fig. 3 is a schematic structural diagram of an embodiment of a pulse fiber laser device according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
In the technical solution of the pulse fiber laser device according to the present invention, each of the functional modules and module units included in the device can correspond to a specific hardware circuit in an integrated circuit structure, and therefore, only the improvement of the specific hardware circuit is involved, and the hardware part does not belong to only a carrier for executing control software or a computer program, so that the corresponding technical problem is solved and the corresponding technical effect is obtained, and no application of any control software or computer program is involved, that is, the technical problem to be solved can be solved and the corresponding technical effect can be obtained only by using the improvement of the hardware circuit structure related to the modules and units, and the corresponding function can be realized without the assistance of specific control software or a computer program.
The pulse fiber laser device of the present invention includes:
a laser seed light source that emits pulse signal light;
a multimode pump laser emitting pump light;
the low-doped erbium-ytterbium double-clad active optical fiber is connected with the laser seed light source;
the highly doped erbium-ytterbium double-clad active fiber is connected with the multimode pump laser;
the multimode pump bridge is connected between the low-doped erbium-ytterbium double-clad active fiber and the high-doped erbium-ytterbium double-clad active fiber, and is used for separating pump light and signal light;
the high-reflectivity fiber grating is connected with the high-doped erbium-ytterbium double-clad active fiber;
the low-reflection fiber grating is connected with the high-reflection fiber grating and the multimode pump laser;
and the reflection grating is connected with the multimode pump bridge, the low-doped erbium-ytterbium double-clad active fiber and the high-doped erbium-ytterbium double-clad active fiber, reflects part of the pump light into the high-doped erbium-ytterbium double-clad active fiber, and transmits the other part of the pump light into the low-doped erbium-ytterbium double-clad active fiber.
In a preferred embodiment of the present invention, the apparatus further comprises an optical circulator connected to the laser seed light source and the low doped erbium ytterbium double clad active fiber.
As a preferred embodiment of the present invention, the apparatus further comprises:
the separator is connected with the optical circulator;
and the output port is connected with the separator and is used as an output port of the laser.
In a preferred embodiment of the present invention, the apparatus further comprises a fiber junction connected to the low doped erbium ytterbium double-clad active fiber and the high doped erbium ytterbium double-clad active fiber.
In a preferred embodiment of the present invention, the low reflectivity fiber grating is a 6nm broadband grating.
In a preferred embodiment of the present invention, the high-reflectivity fiber grating and the low-reflectivity fiber grating are both disposed inside the core of the active optical fiber by laser direct etching.
In a specific embodiment of the present invention, a MOPA fiber laser based on a dual FBG noise reduction technology and a dual-stage EYDCF amplification technology is provided, which can realize high power and high signal-to-noise output without using a conventional EDFA as pre-amplification.
The device comprises the following elements:
a 1550nm laser Seed light source Seed for providing signal light for a pulse laser;
the optical Circulator enables signal light emitted by the seed light source to enter the EYDCF, outputs the signal light returned from the EYDCF, prevents the output return light from reversely emitting into the laser, and plays a role of an isolator;
the erbium ytterbium doped low-doped double-clad active fiber EYDCF1 is used as a gain medium for amplifying signal light;
the highly doped erbium ytterbium double-clad active fiber EYDCF2 is used as a gain medium for amplifying signal light;
the multimode pump bridge MM-WDM is used for separating the pump light and then integrating the pump light and the signal light again;
the high-reflection fiber bragg grating FBG1 is used for performing reflection filtering on the signal light;
the low reflection fiber grating FBG2 reflects a part of 1530nm signal light into EYDCF;
the reflection grating FBG3 reflects part of 940 pump light into the highly doped erbium-ytterbium double-clad active fiber EYDCF2, and transmits part of 940 pump light into the lowly doped erbium-ytterbium double-clad active fiber EYDCF 1;
a 940nm multimode PUMP laser PUMP for providing energy for signal amplification;
the splitter WDM splits 1550nm signal light from 1530nm noise light.
An output end OUT: fiber, laser output port, typically using FC/APC interface;
optical fiber node: the optical fiber is looped to prevent 1530nm light leakage and noise burning loss of the peripheral optical fiber.
The parameters of the elements are as follows:
the technical parameters of the high-reflectivity fiber grating are as follows: center wavelength: 1550nm, 0.5db bandwidth: 4nm, reflectivity > 99%, grating position: an EYDCF core;
the technical parameters of the low-reflection fiber grating are as follows: center wavelength: 1530nm, 3dB bandwidth: 6nm, reflectivity > 80%, grating position: an EYDCF core;
reflection grating FBG3 technical parameters: center wavelength: 940nm, 3dB bandwidth: 10nm, reflectance around: 50%, grating position: an EYDCF core;
the model and parameters of the low-doped erbium-ytterbium double-clad active fiber EYDCF1 are as follows: EYDCF-10/125, core diameter: 10um, cladding diameter: 125um, length 2m, low doping concentration and absorption coefficient.
Model and parameters of highly doped erbium ytterbium double-clad active fiber EYDCF 2: EYDCF-10/125, core diameter: 10um, cladding diameter: 125um, length 2.2m, high doping concentration and absorption coefficient.
The working mode is as follows:
the seed light source sends 1550nm pulse laser, the pulse laser enters the active fiber EYDCF1 with low doped erbium-ytterbium double-clad layer through the circulator, the pulse laser enters the active fiber EYDCF2 with high doped erbium-ytterbium double-clad layer after passing through the multimode pump bridge, the pump laser sends pump laser, the pump laser is directly input into the active fiber EYDCF2 with high doped erbium-ytterbium double-clad layer, the pump laser is transmitted to the multimode pump bridge and then separated from signal light, a part of the pump laser is reflected to the active fiber EYDCF2 with high doped erbium-ytterbium double-clad layer after passing through the reflection grating FBG3, and a part of the pump laser is transmitted to the active fiber EYDCF1 with low doped erbium-ytterbium double-clad layer.
The gain medium absorbs the energy of the pump light during transmission, the signal light amplifies the signal through the atomic excited radiation during the active fiber transmission, and simultaneously the EYDCF spontaneous radiation generates a large amount of ASE light (as shown in 1550nm + ASE in FIG. 2). After the 1550NM signal and the ASE are transmitted to the high-reflection fiber grating, the high-reflection fiber grating performs reflection filtering on the 1550NM signal and a small part of the ASE light, that is, the 1550NM signal and a small part of the ASE light are reflected, the rest of the ASE light is transmitted to the low-reflection fiber grating, and the low-reflection fiber grating reflects about 80% of 1530NM ASE light (such as 1530NM spectrum in fig. 2), so that the 1530NM ASE light is transmitted to the low-reflection fiber grating and then transmitted together with 1550NM which is transmitted reversely to a source optical fiber. The 1550nm signal light is amplified again while being transmitted in the active optical fiber, so that the high-power output of the laser is realized. Meanwhile, 1530NM ASE laser absorbs 1530NM particles, the number of upper-level particles at 1530NM is reduced, and the 1530NM ASE self-excitation effect is effectively reduced. And finally, 1550nm light and 1530nm light are split by the circulator and the splitter to output the fiber laser. Where 1530nm ASE light is lost at the fiber junction.
According to the design scheme, a series of technologies are adopted to control noise in EYDCF and optical devices are subjected to extremely simplified processing, and the MOPA fiber laser capable of realizing high OSNR and high-power laser output by adopting an EYDCF double-stage amplification scheme is realized.
By adopting the multimode pump bridge to realize the bridge connection double-stage scheme of the EYDCF, the scheme can greatly improve the spectrum signal-to-noise ratio and the conversion efficiency, and meanwhile, the pump bridge scheme is adopted to avoid the technical bottleneck that the EYDCF double-stage amplification can be realized only by adopting two sets of pump lasers and beam combiners in the traditional technical scheme, thereby effectively reducing the number of devices and lowering the cost.
940nm FBG is adopted to reflect the residual pump light in the highly doped erbium-ytterbium double-clad active fiber EYDCF2 into the highly doped erbium-ytterbium double-clad active fiber EYDCF2 with high absorption coefficient, so that the absorption efficiency of the pump is effectively improved, and meanwhile, the length of the active fiber can be effectively shortened. Part of pump light is transmitted into the low-doped erbium ytterbium double-clad active fiber EYDCF1, and due to the low doping concentration, the effective inversion of the number of particles can be realized by the lower pump power, so that the saturation of the pump power can reach the pre-amplification effect, the distribution of the pump is adjusted through the grating, the conversion efficiency is effectively improved, and meanwhile, the active fiber is shortened.
The high-reflection fiber bragg grating is adopted to filter the signal light, the signal light is reflected into the active fiber to be amplified again, and the ASE light generated by forward amplification is directly filtered.
The 1530nm light is reflected by the low-reflection fiber grating and then transmitted into the active optical fiber for amplification, upper-level particle consumption is carried out on the 1530nm, on one hand, the ASE power at the 1530nm position can be reduced, the OSNR of the signal light is improved, on the other hand, the energy density of the fiber core of the optical fiber can be reduced, and the self-excitation oscillation in the optical fiber is prevented, so that the spectrum is unstable.
The broadband grating with the bandwidth of 6nm is adopted, the reflection power of ASE light is effectively improved, the effect of consumed particle number is fully improved, and the technical scheme that a semiconductor laser is additionally arranged outside to input de-noising seed light or the traditional gain control for resonance amplification is effectively avoided.
The high-reflection fiber grating and the low-reflection fiber grating are both prepared inside the fiber core through a laser direct etching technology, and do not affect 940nm pump light.
The pump laser is directly welded with the active optical fiber, the phenomenon that the traditional process adopts an optical fiber beam combiner to combine beams is avoided, the optical fiber beam combiner can be avoided, the pump light loss and the heat effect caused by intrinsic loss when the traditional beam combiner is used are avoided, the device cost is saved, and the electro-optic conversion efficiency and the reliability of the device are effectively improved.
By adopting a single-fiber double-pass amplification design scheme, the active optical fiber is short in length, the nonlinear threshold is effectively improved, the influence of the nonlinear effect of the optical fiber on the signal-to-noise ratio and the absorption efficiency is avoided, the pumping absorption efficiency is increased, the electro-optic conversion efficiency is improved, and the raw material cost is reduced.
The effect of the isolator can be achieved by using the circulator, the traditional laser is prevented from being isolated by using a fiber isolator, and the interference of external return light on the laser is prevented. The cost is reduced, the processing difficulty is reduced, and the isolation requirement is met.
Based on the main light path design of the utility model, the light path of the complete MOPA fiber laser is shown in figure 1,
the output optical fiber of the laser seed light source is welded with the first port of the optical circulator, the second port of the optical circulator is welded with the low-doped erbium-ytterbium double-clad active optical fiber EYDCF1, the low-doped erbium-ytterbium double-clad active optical fiber EYDCF1 is connected with the multimode pump bridge in series, the tail end of an EYDCF grating is welded with the multimode pump laser, the second port of the circulator is welded with the single end of the separator, the 1550nm end of the separator is welded with the output jumper, and the 1530nm end of the separator is knotted.
In the specific embodiment of the utility model, the light path design scheme of the extremely simple MOPA fiber laser can realize high OSNR and high-power laser output by adopting a double-stage EYDCF amplification scheme. The experimental data are as follows: at the seed light source repetition frequency: 500khz, pulse width: 3ns, and the output peak power is 80 mw; pump output power: under the test condition of 6W, the pulse peak power is obtained: 1.0KW, OSNR 40 dB.
By adopting the pulse fiber laser device, ultrahigh output power and optical spectrum OSNR can be obtained, and the adoption of the traditional EDFA as a two-stage structure of pre-amplification and power amplification is avoided. The fiber laser amplification design can be completed by a very simple optical path design scheme: only three passive optical devices are used in the optical path scheme. The extremely simple light path structure enables the production time of the optical fiber laser to be shortened to half of that of a traditional pre-amplification two-stage scheme, greatly improves the production efficiency and reduces the labor cost of the laser. The extremely simple optical path structure enables the cost of components of the optical fiber laser to be greatly low, and compared with the traditional solution, the cost is reduced by more than half. The laser can be integrated into a subminiature structure, is convenient for commercial batch use and has ultrahigh reliability.
In this specification, the utility model has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the utility model. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (6)
1. A pulsed fiber laser device, said device comprising:
a laser seed light source that emits pulse signal light;
a multimode pump laser emitting pump light;
the low-doped erbium-ytterbium double-clad active optical fiber is connected with the laser seed light source;
the highly doped erbium-ytterbium double-clad active fiber is connected with the multimode pump laser;
the multimode pump bridge is connected between the low-doped erbium-ytterbium double-clad active fiber and the high-doped erbium-ytterbium double-clad active fiber, and is used for separating pump light and signal light;
the high-reflectivity fiber grating is connected with the high-doped erbium-ytterbium double-clad active fiber;
the low-reflection fiber grating is connected with the high-reflection fiber grating and the multimode pump laser;
and the reflection grating is connected with the multimode pump bridge, the low-doped erbium-ytterbium double-clad active fiber and the high-doped erbium-ytterbium double-clad active fiber, reflects part of the pump light into the high-doped erbium-ytterbium double-clad active fiber, and transmits the other part of the pump light into the low-doped erbium-ytterbium double-clad active fiber.
2. The pulsed fiber laser device of claim 1, further comprising an optical circulator connected to said laser seed source and said low-doped erbium ytterbium double-clad active fiber.
3. The pulsed fiber laser device according to claim 2, further comprising:
the separator is connected with the optical circulator;
and the output port is connected with the separator and is used as an output port of the laser.
4. The pulsed fiber laser device of claim 2, further comprising a fiber junction connected to the low doped erbium ytterbium double clad active fiber and the high doped erbium ytterbium double clad active fiber.
5. The pulsed fiber laser device according to claim 1, wherein the low-reflectivity fiber grating is a 6nm broadband grating.
6. The pulsed fiber laser device according to claim 1, wherein the high-reflectivity fiber grating and the low-reflectivity fiber grating are both disposed inside the core of the active fiber by laser direct etching.
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| CN202122287363.6U CN215955685U (en) | 2021-09-22 | 2021-09-22 | Pulse optical fiber laser device |
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| CN202122287363.6U CN215955685U (en) | 2021-09-22 | 2021-09-22 | Pulse optical fiber laser device |
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