CN116053912B - Double-stage MOPA fiber laser with high integration - Google Patents
Double-stage MOPA fiber laser with high integration Download PDFInfo
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- 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
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094069—Multi-mode pumping
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- 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
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- 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
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- 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
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- H—ELECTRICITY
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- 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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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Abstract
The invention relates to a double-stage MOPA fiber laser with high integration, wherein the fiber laser comprises: the two-way multimode pump splitter is used for independently carrying out multiplexing and light splitting treatment on pump light input by each multimode pump laser according to a preset light splitting proportion; the optical path combination device is used for carrying out combination treatment of filtering, branching and optical isolation on the input signal light; and the first end of the optical path combination device is also externally connected with a monitoring port, and the monitoring port is used for providing the output power monitoring function for the fiber laser. The two-stage MOPA fiber laser with high integration adopts a two-stage amplifying structure and filters between the first stage and the second stage, so that the optical signal to noise ratio (OSNR) is effectively increased, the traditional scheme of using EDFA as the first stage to improve the OSNR is avoided, and the two-stage MOPA fiber laser with high integration has the advantages of high working temperature, good spectrum quality, low cost, simple driving current and the like.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to the technical field of optical fiber lasers, and specifically relates to a double-stage MOPA optical fiber laser with high integration.
Background
Along with the continuous development of radar technology, the laser radar technology at the vehicle end and the road end is mature gradually, and 1550nm laser radar is widely applied because of the advantages of eye safety, long detection distance, high image definition and the like. The 1550nm optical fiber laser is used as a core component to provide a detection light source for a radar system, and along with the development of radar technology, higher requirements are provided for performance parameters, reliability and manufacturability of the optical fiber laser, such as: the conventional fiber laser technical scheme generally adopts the technical scheme of EDFA+EYDAA, which can obtain high optical performance parameters but does not have high reliability, environmental applicability and manufacturability. Therefore, a high-power fiber laser with excellent performance index, high reliability, simple structure and easy manufacture is very necessary.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a high-reliability and high-performance double-stage MOPA fiber laser with high integration.
In order to achieve the above object, the dual-stage MOPA fiber laser with high integration according to the present invention is as follows:
the double-stage MOPA fiber laser with high integration is mainly characterized in that the fiber laser comprises:
the two-way multimode pump splitter is used for independently carrying out multiplexing and light splitting treatment on pump light input by each multimode pump laser according to a preset light splitting proportion;
the optical path combination device is used for carrying out combination treatment of filtering, branching and optical isolation on the input signal light; and the first end of the optical path combination device is also externally connected with a monitoring port, and the monitoring port is used for providing the output power monitoring function for the fiber laser.
Preferably, the optical path combining device includes:
a filter for performing a first filtering process of ASE noise on the signal light transmitted in the forward direction and performing a second filtering process of ASE noise on the reflected signal light;
the optical splitter is connected with the filter and is used for reflecting the signal light according to a specific proportion and transmitting the rest signal light, wherein the signal light subjected to the optical reflection treatment is connected with the monitoring port and is used for outputting the reference light of the fiber laser; and
and the isolator is connected with the beam splitter and is used for outputting the signal light after light transmission treatment.
Preferably, the two-way multimode pump splitter comprises: COM1 port, COM2 port, ref 1 port, ref2 port, PASS1 port, and PASS2 port, wherein,
the pump light is transmitted from the port COM1, then part of the pump light is split into the port Ref 1, and the other part of the pump light is output by the port PASS1 after being transmitted; and after the pump light is incident from the COM2 port, part of the pump light is split into the Ref2 port, and the other part of the pump light is transmitted and then output by the PASS2 port.
Preferably, the fiber laser further comprises:
the first beam combiner is connected with the Ref 1 port and the Ref 1 port of the two-way multimode pump splitter and is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into the first erbium-ytterbium co-doped optical fiber together;
the first end of the first erbium-ytterbium co-doped fiber is connected with the first beam combiner, the second end of the first erbium-ytterbium co-doped fiber is connected with the first end of the optical path combination device and used as a gain medium for laser amplification of the fiber laser, and the optical amplification treatment is realized by absorbing pumping light energy and transferring the pumping light energy into signal light.
Preferably, the fiber laser further comprises:
the second beam combiner is connected with the PASS1 port and the PASS2 port of the two-way multimode pump splitter and is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into a second erbium-ytterbium co-doped optical fiber together;
the first end of the second erbium-ytterbium co-doped fiber is connected with the second end of the optical path combination device, the second end of the second erbium-ytterbium co-doped fiber is connected with the second beam combiner and used as a gain medium for laser amplification of the fiber laser, and the optical amplification treatment is realized by absorbing pumping light energy and transferring the pumping light energy into signal light.
Preferably, the fiber laser further comprises:
the first multimode pump laser is connected with a COM1 port of the two-way multimode pump branching device and is used for outputting the pump light and providing energy for amplifying the signal light; and
the second multimode pump laser is connected with the COM2 port of the two-way multimode pump branching device and is used for outputting the pump light and providing energy for amplifying the signal light.
Preferably, the fiber laser further comprises:
the seed light source is arranged at the input end of the fiber laser, and an isolator is further arranged in the seed light source and used for providing signal light for the fiber laser and preventing non-return light from entering the fiber laser.
Preferably, the fiber laser further comprises a control circuit, wherein the control circuit is arranged at the input end of the fiber laser and is internally provided with a computer control program for controlling the fiber laser to perform laser amplification treatment.
Preferably, the output end of the fiber laser is further provided with a third isolator, and the third isolator is connected with the output end of the second beam combiner and is used for outputting the amplified signal light.
Preferably, the fiber laser further comprises an output port, and the output port is connected with the third isolator and is used for outputting high-power laser generated by the fiber laser.
The two-stage MOPA fiber laser with high integration realizes extremely simple optical path design by adopting the high-integration integrated ISO+seed laser, the BPF+TAP+ISO hybrid device and the two-way multimode pumping branching device. In addition, the design scheme adopts a two-stage amplification scheme, so that the device has ultrahigh OSNR output, and meanwhile, the TAP end of the laser is directly output by an intermediate stage to serve as reference light, so that the loss of output power is effectively improved, the reliability of the device is improved, and the device has good delay characteristics.
Drawings
Fig. 1 is a schematic diagram of a dual stage MOPA fiber laser with high integration according to the present invention.
Fig. 2 is a schematic structural view of the optical path combining device of the present invention.
Fig. 3 is a schematic structural diagram of a two-way multimode pump splitter according to the present invention.
Fig. 4 is a schematic diagram of the combination of hardware and software of a dual stage MOPA fiber laser with high integration according to the present invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments.
Before describing in detail embodiments that are in accordance with the present invention, it should be observed that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, the dual-stage MOPA fiber laser with high integration, wherein the fiber laser includes:
the two-way multimode pump splitter is used for independently carrying out multiplexing and light splitting treatment on pump light input by each multimode pump laser according to a preset light splitting proportion;
the optical path combination device is used for carrying out combination treatment of filtering, branching and optical isolation on the input signal light; and the first end of the optical path combination device is also externally connected with a monitoring port, and the monitoring port is used for providing the output power monitoring function for the fiber laser.
As a preferred embodiment of the present invention, referring to fig. 2, the optical path combining device includes:
a filter for performing a first filtering process of ASE noise on the signal light transmitted in the forward direction and performing a second filtering process of ASE noise on the reflected signal light;
the optical splitter is connected with the filter and is used for reflecting the signal light according to a specific proportion and transmitting the rest signal light, wherein the signal light subjected to the optical reflection treatment is connected with the monitoring port and is used for outputting the reference light of the fiber laser; and
and the isolator is connected with the beam splitter and is used for outputting the signal light after light transmission treatment.
As a preferred embodiment of the present invention, referring to fig. 3, the two-way multimode pump splitter includes: COM1 port, COM2 port, ref 1 port, ref2 port, PASS1 port, and PASS2 port, wherein,
the pump light is transmitted from the port COM1, then part of the pump light is split into the port Ref 1, and the other part of the pump light is output by the port PASS1 after being transmitted; and after the pump light is incident from the COM2 port, part of the pump light is split into the Ref2 port, and the other part of the pump light is transmitted and then output by the PASS2 port.
As a preferred embodiment of the present invention, the fiber laser further includes:
the first beam combiner is connected with the Ref 1 port and the Ref 1 port of the two-way multimode pump splitter and is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into the first erbium-ytterbium co-doped optical fiber together;
the first end of the first erbium-ytterbium co-doped fiber is connected with the first beam combiner, the second end of the first erbium-ytterbium co-doped fiber is connected with the first end of the optical path combination device and used as a gain medium for laser amplification of the fiber laser, and the optical amplification treatment is realized by absorbing pumping light energy and transferring the pumping light energy into signal light.
As a preferred embodiment of the present invention, the fiber laser further includes:
the second beam combiner is connected with the PASS1 port and the PASS2 port of the two-way multimode pump splitter and is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into a second erbium-ytterbium co-doped optical fiber together;
the first end of the second erbium-ytterbium co-doped fiber is connected with the second end of the optical path combination device, the second end of the second erbium-ytterbium co-doped fiber is connected with the second beam combiner and used as a gain medium for laser amplification of the fiber laser, and the optical amplification treatment is realized by absorbing pumping light energy and transferring the pumping light energy into signal light.
As a preferred embodiment of the present invention, the fiber laser further includes:
the first multimode pump laser is connected with a COM1 port of the two-way multimode pump branching device and is used for outputting the pump light and providing energy for amplifying the signal light; and
the second multimode pump laser is connected with the COM2 port of the two-way multimode pump branching device and is used for outputting the pump light and providing energy for amplifying the signal light.
As a preferred embodiment of the present invention, the fiber laser further includes:
the seed light source is arranged at the input end of the fiber laser, and an isolator is further arranged in the seed light source and used for providing signal light for the fiber laser and preventing non-return light from entering the fiber laser.
As a preferred embodiment of the present invention, referring to fig. 4, the fiber laser further includes a control circuit, where the control circuit is disposed at an input end of the fiber laser, and has a built-in computer control program for controlling the fiber laser to perform laser amplification processing.
As a preferred embodiment of the present invention, the output end of the fiber laser is further provided with a third isolator, and the third isolator is connected with the output end of the second beam combiner and is used for outputting the amplified signal light.
As a preferred embodiment of the present invention, the fiber laser further includes an output port, and the output port is connected to the third isolator, and is configured to output the high-power laser generated by the fiber laser.
Referring to fig. 1, the following details of the functional components of the fiber laser according to the present embodiment will be described with reference to fig. 1:
seed light source with isolator: the seed light source as the laser provides signal light for the laser, and the seed light source is integrated with a two-stage isolator to prevent ASE light or other back-to-back light of the first-stage amplifier from entering the seed laser. Preventing the seed laser from being broken down by return light.
A first beam combiner: pump light and signal light are coupled into the same optical fiber and injected into the first erbium ytterbium co-doped optical fiber together.
Two-way multimode pump splitter: the PUMP light of the first multimode PUMP laser (PUMP 1) and the PUMP light of the second multimode PUMP laser (PUMP 2) are split into fixed splitting ratios independently.
The first erbium-ytterbium co-doped fiber: the gain medium of laser amplification absorbs the energy of the pumping light and transfers the energy to the signal light to realize the optical amplification.
Optical path combination device: the filter is used for filtering the light output by the first stage and removing ASE noise, the optical splitter is used for dividing the signal light into 2 paths, and the isolator is used for preventing return light from entering the first stage amplifier to influence the amplification of the front stage.
The second erbium ytterbium co-doped fiber: the gain medium of laser amplification absorbs the energy of the pumping light and transfers the energy to the signal light to realize the optical amplification.
A second beam combiner: pump light and signal light are coupled into the same optical fiber and injected into a second erbium ytterbium co-doped optical fiber together.
Monitoring ports: an output power monitoring port is provided for the laser.
An output port: a high power laser output port. The laser light exits from the port.
In practical application, the working principle of the high-integration two-stage MOPA fiber laser is as follows:
the seed laser with the two-stage isolator emits weak pulse signal light, then enters the first erbium-ytterbium co-doped optical fiber through the first beam combiner, the active optical fiber amplifies the signal light after absorbing the pump light and generates partial ASE, the signal light and the ASE are transmitted out of EYDCF1 and then enter the optical path combination device, the filter in the optical path combination device filters the ASE light, and the signal light passes through the filter. And then, the beam splitter in the combined device divides the signal light into 2 beams, one beam is reflected and then directly output through the filter as a monitoring port of the laser, the monitoring port is used for calibrating and monitoring the power of the radar system, the rest signal light continues to be transmitted forwards through ISO and then enters EYDCF2, in EYDCF, the active optical fiber absorbs the pumping light to further amplify the signal light again so as to obtain high power, and the amplified signal light is output after passing through the third isolator.
The transmission path of the pump signal light is: the pumping light emitted by the first multimode pumping laser is transmitted into a two-way multi-mode pumping branching device, the pumping light is divided into 2 ways according to the determined splitting ratio, one way is transmitted into the first-stage amplifier, and the other way is transmitted into the second-stage amplifier. Similarly, the pump light of the second multimode pump light device is divided into 2 paths of determined splitting ratio after passing through the multimode pump splitter, wherein the first path of pump light is transmitted into the first-stage amplifier, and the second path of pump light is transmitted into the second-stage amplifier.
The working principle of the optical path combination device of the technical scheme is as follows:
the combined device is a mixed device of a band-pass filter, a beam splitter and an isolator, light of an input device is firstly subjected to denoising treatment through the band-pass filter, and ASE spectrum generated by front-stage amplification is filtered. After that, the signal light reflects a certain percentage of the signal light in the spectroscopic plate and transmits a ratio to a part of the signal light. The reflected signal light is coupled into the optical fiber again and then transmitted, and the transmitted signal light is output through the isolator.
In the practical application process, the combined device has the following technical advantages:
1. the order of the combination modes of the combination devices is BPF+splitter+ISO, and the functions of any device are completely lost when the positions of the devices are adjusted. On the one hand, the BPF provides a filtering function for forward transmitted signal light, so that ASE generated by first-stage amplification is effectively filtered, noise of an output spectrum is effectively reduced, and the quality of a light beam is improved. On the other hand, the reflected signal light is filtered again. For reflected light, the filter filters the reflected return light again, equivalently, the filter provides two filtering actions, ASE noise is reduced by 3dB again, the optical signal to noise ratio of MON output port signal light is effectively improved, and the monitoring and calibration of a radar system are facilitated.
2. The combined device integrates three functional devices, so that the combined device shares the same set of core raw materials such as glass tube, optical fiber and the like, thereby effectively reducing the cost and improving the reliability of the device.
3. The isolator in the hybrid device adopts special ISO, the normal temperature isolator reaches 60dB, and when the temperature is higher than 100 ℃, the isolation degree can still reach 40dB, the effect of the isolator is greatly enhanced in the full temperature range, and the condition that the isolation degree is reduced under the high temperature condition is effectively avoided.
4. The optical fiber of the device is coated by a special material, can meet the working range of-60-150 ℃, and can be suitable for vehicle-mounted radars and harsh working environments thereof.
The working principle of the two-way multimode pumping splitter of the technical scheme is as follows:
and after the pump light is incident from the COM1 port, part of the pump light is split into the Ref 1 port, and the other part of the pump light is transmitted and then is output by the PASS1 port. Similarly, after the pump light is incident from the COM2 port, part of the pump light is split into the Ref2 port, and the other part of the pump light is transmitted and then is output by the PASS2 port.
The two-way multimode pumping splitter has the following technical advantages in the practical application process:
by adopting the two-way branching device solution, branching can be realized by sharing one light splitting sheet, the traditional discrete devices are combined into one, two raw materials are avoided, the cost is effectively saved, and the resources are reduced.
The size of the double-way branching unit is 4.0 multiplied by 30mm, which is consistent with the size of the traditional single-way branching unit, so that the space is effectively saved, and the possibility of realizing an ultra-compact structure of the module is provided.
Furthermore, in combination with a specific product structure, the technical scheme has the following technical innovation in practice:
1. MON mouth (monitoring port) has the intermediate level to export, avoids traditional technical scheme MON mouth to have the output to export, and it possesses following advantage: 1, the traditional scheme is to use the splitter to split light to serve as a MON port after outputting the isolator, and the scheme can realize a good light splitting effect, but the scheme introduces about 0.2-0.5 dB of insertion loss on one hand in the way of adding devices at the output port, and the output power of the laser is in the watt level, so that the signal light of about hundred milliwatts is lost, the efficiency of the laser is greatly reduced on the one hand, and on the other hand, the reliability of the devices and the laser is greatly influenced by converting part of the signal light into heat. Therefore, the MON port is designed as the intermediate stage, and adverse effects caused by high loss of the output port can be effectively avoided. And the power of the intermediate stage is only tens of milliwatts, so that the loss of optical energy is greatly reduced, and the device is operated in a very low power state, so that the reliability is greatly improved.
2. Compared with the scheme that the MON port is arranged at the output port, the light splitting is usually carried out by adopting the scheme that the 99:1 ratio is adopted, however, the laser has kilowatt peak power, and the PD detector is adopted for detection after the output light of the MON port is attenuated again. On the one hand, energy is wasted, and on the other hand, loss points are needed to be increased to adjust output power in the reproduction process, so that production efficiency and production consistency are greatly affected. Finally, the process for realizing the loss point is usually staggered welding, so that the reliability is greatly reduced, and the requirement of high reliability of the vehicle-mounted radar can not be met. The MON port can be detected without re-loss due to relatively low power after being output by the intermediate stage, so that the manufacturing and reliability feasibility are greatly improved.
3. The front stage pump and the rear stage pump are realized by the same pump branch and the beam splitting ratio is fixed, so MON output power and output power show good linear relation, and the monitoring of the output power can be realized without compensation and calibration. Has great manufacturability and production characteristics.
4. The fiber laser is compatible with two working modes of high power and low power. The laser in the low power mode realizes the redundant design of double pumps by adopting only the double multimode pump splitter and two equivalent pumps, and can equivalently start the second pump after one pump fails, thereby effectively improving the reliability of the radar light source and overcoming the problem of high pump failure in the traditional radar light source. The method comprises the steps of carrying out a first treatment on the surface of the In the high power mode, two pumps can simultaneously provide energy for the active optical fiber, and high output power of 2-3W can be realized.
5. The dual-stage amplifying structure is adopted and filtering is carried out between the first stage and the second stage, so that the optical signal to noise ratio (OSNR) is effectively increased, the traditional scheme of using EDFA as the first stage to improve the OSNR is avoided, and the dual-stage amplifying structure has the advantages of high working temperature, good spectrum quality, low cost, simple driving current and the like.
It can be understood that the two-stage MOPA fiber laser with high integration in the present technical solution is suitable for a 1550nm MOPA fiber pulse laser, but is not limited to the band, and in practical application, the structure can be adaptively modified according to practical product requirements on the premise of conforming to the inventive concept in the present technical solution, and corresponding modification is also included in the protection scope of the present disclosure.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution device.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, where the program when executed includes one or a combination of the steps of the method embodiments.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "examples," "specific examples," or "embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
The two-stage MOPA fiber laser with high integration realizes extremely simple optical path design by adopting the high-integration integrated ISO+seed laser, the BPF+TAP+ISO hybrid device and the two-way multimode pumping branching device. In addition, the design scheme adopts a two-stage amplification scheme, so that the device has ultrahigh OSNR output, and meanwhile, the TAP end of the laser is directly output by an intermediate stage to serve as reference light, so that the loss of output power is effectively improved, the reliability of the device is improved, and the device has good delay characteristics.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent, however, that various modifications and changes may be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (4)
1. A dual stage MOPA fiber laser with high integration, said fiber laser comprising:
the two-way multimode pump splitter is used for independently carrying out multiplexing and light splitting treatment on pump light input by each multimode pump laser according to a preset light splitting proportion;
the optical path combination device is used for carrying out combination treatment of filtering, branching and optical isolation on the input signal light; the first end of the optical path combination device is also externally connected with a monitoring port, and the monitoring port is used for providing an output power monitoring function for the fiber laser;
the optical path combination device comprises:
a filter for performing a first filtering process of ASE noise on the signal light transmitted in the forward direction and performing a second filtering process of ASE noise on the reflected signal light;
the optical splitter is connected with the filter and is used for reflecting the signal light according to a specific proportion and transmitting the rest signal light, wherein the signal light subjected to the optical reflection treatment is connected with the monitoring port and is used for outputting the reference light of the fiber laser; and
the isolator is connected with the beam splitter and is used for outputting signal light after light transmission treatment;
the two-way multimode pump splitter comprises: COM1 port, COM2 port, ref 1 port, ref2 port, PASS1 port, and PASS2 port, wherein,
the pump light is transmitted from the port COM1, then part of the pump light is split into the port Ref 1, and the other part of the pump light is output by the port PASS1 after being transmitted; the pump light is transmitted from the port COM2, and then part of the pump light is transmitted to the port Ref2, and the other part of the pump light is output by the port PASS 2;
the fiber laser also comprises:
the first beam combiner is connected with the Ref 1 port and the Ref 1 port of the two-way multimode pump splitter and is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into the first erbium-ytterbium co-doped optical fiber together;
the first end of the first erbium-ytterbium co-doped optical fiber is connected with the first beam combiner, and the second end of the first erbium-ytterbium co-doped optical fiber is connected with the first end of the optical path combination device and is used for providing a gain medium for laser amplification for the optical fiber laser, and the optical amplification treatment is realized by absorbing pumping light energy and transferring the pumping light energy into signal light;
the fiber laser also comprises:
the second beam combiner is connected with the PASS1 port and the PASS2 port of the two-way multimode pump splitter and is used for coupling pump light and signal light into the same optical fiber and injecting the pump light and the signal light into a second erbium-ytterbium co-doped optical fiber together;
the first end of the second erbium-ytterbium co-doped optical fiber is connected with the second end of the optical path combination device, and the second end of the second erbium-ytterbium co-doped optical fiber is connected with the second beam combiner and is used for providing a gain medium for laser amplification for the optical fiber laser, and the optical amplification treatment is realized by absorbing pumping light energy and transferring the pumping light energy into signal light;
the fiber laser also comprises:
the first multimode pump laser is connected with a COM1 port of the two-way multimode pump branching device and is used for outputting the pump light and providing energy for amplifying the signal light; and
the second multimode pump laser is connected with a COM2 port of the two-way multimode pump branching device and is used for outputting the pump light and providing energy for amplifying the signal light;
the fiber laser also comprises:
the seed light source is arranged at the input end of the fiber laser, and an isolator is further arranged in the seed light source and used for providing signal light for the fiber laser and preventing non-return light from entering the fiber laser.
2. The dual-stage MOPA fiber laser with high integration according to claim 1, wherein said fiber laser further comprises a control circuit, said control circuit is disposed at an input end of said fiber laser, and a computer control program is disposed in said control circuit for controlling said fiber laser to perform laser amplification processing.
3. The two-stage MOPA fiber laser with high integration according to claim 1, wherein the fiber laser is further provided with a third isolator at an output end, and the third isolator is connected with the output end of the second beam combiner and is used for outputting the amplified signal light.
4. The dual stage MOPA fiber laser with high integration as defined in claim 3, further comprising an output port, said output port being connected to said third isolator for outputting high power laser light generated by said fiber laser.
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| WO2002091048A1 (en) * | 2001-04-20 | 2002-11-14 | Huawei Technologies Co., Ltd. | Pumping light source connecting device of er-doped cascade fiber amplifier |
| CN209963478U (en) * | 2019-07-30 | 2020-01-17 | 无锡市德科立光电子技术有限公司 | High-power optical fiber amplifier with two-stage pumping redundancy protection |
| CN215955686U (en) * | 2021-10-11 | 2022-03-04 | 上海拜安实业有限公司 | Fiber laser device for realizing double-stage amplification |
| CN219394007U (en) * | 2023-03-20 | 2023-07-21 | 上海拜安实业有限公司 | Fiber laser with multi-core pumping structure |
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| CN109120370B (en) * | 2018-07-27 | 2020-05-12 | 武汉光迅科技股份有限公司 | DWDM remote pumping system capable of improving OSNR |
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| WO2002091048A1 (en) * | 2001-04-20 | 2002-11-14 | Huawei Technologies Co., Ltd. | Pumping light source connecting device of er-doped cascade fiber amplifier |
| CN209963478U (en) * | 2019-07-30 | 2020-01-17 | 无锡市德科立光电子技术有限公司 | High-power optical fiber amplifier with two-stage pumping redundancy protection |
| CN215955686U (en) * | 2021-10-11 | 2022-03-04 | 上海拜安实业有限公司 | Fiber laser device for realizing double-stage amplification |
| CN219394007U (en) * | 2023-03-20 | 2023-07-21 | 上海拜安实业有限公司 | Fiber laser with multi-core pumping structure |
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