CN116505355A - Pump multiplexing all-fiber pulse laser - Google Patents
Pump multiplexing all-fiber pulse laser Download PDFInfo
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- CN116505355A CN116505355A CN202310681485.4A CN202310681485A CN116505355A CN 116505355 A CN116505355 A CN 116505355A CN 202310681485 A CN202310681485 A CN 202310681485A CN 116505355 A CN116505355 A CN 116505355A
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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
- H01S3/0675—Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0064—Anti-reflection devices, e.g. optical isolaters
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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
- H01S3/09—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
- H01S3/094042—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a fibre laser
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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
- H01S3/09—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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- 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
- H01S3/10007—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention relates to a pump multiplexing all-fiber pulse laser, wherein the laser comprises: a seed light source for generating high peak power pulse signal light; the optical fiber amplifying link is used for carrying out optical amplification and frequency domain filtering shaping treatment on the input pulse signal light; the (2+1) x 1 active optical fiber combiner is used for coupling the received pumping light to the inner cladding of the optical fiber amplifying link and is used as an output end of the amplifying signal pulse; the pump laser module is used for providing a pump light signal for the laser; the isolator is arranged at the output end of the laser and used for isolating backward return light and protecting the safety of the seed light source. The pump multiplexing all-fiber pulse laser adopts a highly integrated high-power DFB chip and isolator integrated packaging seed source scheme to realize pulse seed light injection with peak power increased by one order of magnitude, and can obtain high peak power output at any wavelength of 1550nm wave band and high signal to noise ratio.
Description
Technical Field
The invention relates to the technical field of fiber lasers, in particular to the technical field of pulse fiber lasers, and specifically relates to a pump multiplexing all-fiber pulse laser.
Background
In recent years, with the rising of the intelligent driving technology revolution, the market demand of the vehicle-gauge laser radar is increasing, wherein the 1550 nm-band pulse optical fiber MOPA laser is gradually the first-choice light source of the vehicle-mounted laser radar due to the fact that the laser is safe for eyes, high in integration level, low in cost, long in detection distance and durable in performance. However, in an optical fiber MOPA system based on a low-energy 1550nm semiconductor chip seed source, because the pulse energy is too low and the pulse sequence period is far longer than the pulse transmission time in an optical fiber amplifier, the seed pulse is difficult to fully extract the energy of the amplifier, no pulse passes through a gain medium in the pulse interval time, and the gain fiber above the pumping threshold consumes a large amount of pumping energy due to spontaneous radiation, so that the Amplified Spontaneous Emission (ASE) noise content in the output pulse sequence of the amplifier is too high, the urgent application requirements of an automatic driving radar system on farther detection distance and clearer image quality cannot be met, and the development of a pulse optical fiber laser with high cost performance, ultrahigh signal to noise ratio, high peak power, temperature insensitivity and high reliability is very important.
ASE noise suppression is a main technical difficulty of low-energy DFB seed source optical fiber MOPA, and currently adopted ASE suppression technologies mainly comprise seed energy improvement, fiber Bragg Grating (FBG) filtering and multi-pass regeneration amplification technologies. In terms of seed energy boosting, the peak power of conventional DFB seed sources limited by semiconductor materials is only on the order of a few mW, which presents a significant challenge for subsequent power amplification. The FBG filtering technology has the advantages of simple structure and low cost, is limited by the temperature sensitivity characteristic of the FBG, and under the actual driving environment with severe temperature change, the narrow-band FBG filter is extremely easy to cause the system paralysis caused by the mismatch of the signal wavelength and the Bragg wavelength, and additional heat insulation treatment is needed, while the wider FBG filter can avoid the problem of wavelength mismatch, but too much accompanying spontaneous radiation light is difficult to filter, so that the spectral signal-to-noise ratio and the pulse contrast of amplified pulses are greatly limited. In addition, the multi-pass regeneration amplification technology is quite suitable for high-efficiency and low-noise amplification of low-repetition-frequency small-signal pulses, but an optical switching device with high manufacturing cost is required to be introduced for pulse menu and amplification range number control, so that the system structure is complicated and the cost is greatly improved, which is contrary to the pursued low cost and small size of a laser radar light source.
In summary, any of the three techniques described above cannot find a balance point in performance targets of high cost performance, high peak power, ultra high signal to noise ratio, and temperature stability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a pumping multiplexing all-fiber pulse laser with low cost, reliability, high peak power, high signal-to-noise ratio, long service life and low energy consumption.
In order to achieve the above object, the pump multiplexing all-fiber pulse laser of the present invention is as follows:
the pumping multiplexing all-fiber pulse laser is mainly characterized in that the laser comprises:
a seed light source for generating high peak power pulse signal light;
the optical fiber amplifying link is connected with the output end of the seed light source and is used for carrying out optical amplification and frequency domain filtering shaping treatment on the input pulse signal light;
the cone-pulling type (2+1) x 1 active optical fiber combiner is used for coupling the received pumping light to the inner cladding of the optical fiber amplifying link and is used as an output end of an amplifying signal pulse;
the pump laser module is used for providing a pump light signal for the laser; and
the isolator is arranged at the output end of the laser and used for isolating backward return light and protecting the safety of the seed light source.
Preferably, the seed light source is 1550nm wave band high-power distributed feedback type DFB chip laser, and an anti-feedback design of a built-in optical isolator is adopted for isolating backward return light of the optical fiber amplifying link so as to protect the seed light source.
Preferably, the optical fiber amplifying link specifically includes:
the first gain optical fiber and the second gain optical fiber are erbium-ytterbium co-doped double-clad optical fibers, and are connected through a bicolor band-pass filter; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first gain optical fiber has the characteristics of low doping concentration and small core diameter, and the range of the core diameter is 5-8 um, and is used for carrying out pre-amplification treatment on the pulse signal light;
the second gain optical fiber has the characteristics of high doping concentration and large core diameter, and the range of the core diameter is 8-15 um, and is used for carrying out main amplification treatment on the pulse signal light.
Preferably, the bicolor band-pass filter is a wave plate bicolor filter integrally packaged by optical fibers, and is designed by adopting a wave plate coating process and is used for transmitting forward pulse signal light and reverse pump light simultaneously and filtering ASE noise in a pre-amplification pulse sequence; and the incidence end tail fiber of the bicolor band-pass filter is matched with the first gain fiber, and the emergence end tail fiber of the bicolor band-pass filter is matched with the second gain fiber.
Preferably, the bicolor band-pass filter can select bicolor band-pass filter MM940-1550BPF or bicolor band-pass filter beam splitter MM940-1550TAP+BPF, and the bicolor band-pass filter beam splitter is additionally provided with a TAP end for outputting a small part of reflected light so as to monitor the state of the laser.
Preferably, the tail fiber at the signal input end of the cone-pulling type (2+1) x 1 active optical fiber combiner is the second gain optical fiber, and the tail fiber at the signal output end of the cone-pulling type (2+1) x 1 active optical fiber combiner is a double-clad optical fiber with the mode field diameter matched with the second gain optical fiber.
Preferably, the pump laser module specifically includes:
the system comprises a first multimode pump laser and a second multimode pump laser, wherein wave bands of the first multimode pump laser and the second multimode pump laser are 940nm, the central wavelength range of output tail fibers of the first multimode pump laser and the second multimode pump laser is 915-970 nm, the maximum pump power of a single tube is 30W, and the pump power of the pump laser module is controlled by changing the model or the length of the second gain fiber, so that the pump proportion range distributed between the first gain fiber and the second gain fiber is 1:1-1:3.
Preferably, the isolator is an on-line isolator, the tail fiber of the isolator is a passive fiber with the mode field diameter matched with that of the second gain fiber, and the output end face is cut by 8 degrees.
Preferably, the optical fiber amplifying link is a two-stage or more optical fiber amplifier.
The pump multiplexing all-fiber pulse laser adopts a highly integrated high-power DFB chip and isolator integrated packaging seed source scheme to realize pulse seed light injection with peak power increased by one order of magnitude, and can obtain high peak power output at any wavelength of 1550nm wave band and high signal to noise ratio. And secondly, the waveplate type double-color band-pass filter is adopted to realize narrow-band filtering with stable and reliable center wavelength temperature, so that the pulse signal-to-noise ratio and the environmental adaptability are further improved, meanwhile, the multiplexing of the pump power fractions is realized, the pump utilization efficiency is effectively improved, the equipment size and the manufacturing cost are reduced, and the production efficiency is improved. In addition, the operation reliability and the safety characteristic of the fiber laser are effectively improved by adopting a double-pump redundancy design. The technical scheme integrates the advantages of low manufacturing cost, high peak power, ultra-high signal-to-noise ratio, temperature stability and the like, and is suitable for a terminal laser radar system.
Drawings
Fig. 1 is a light path design diagram of a pump multiplexing all-fiber pulse laser according to a first embodiment of the present invention.
Fig. 2 is a light path design diagram of a pump multiplexing all-fiber pulse laser according to a second embodiment of the 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 and 2, the pump multiplexing all-fiber pulse laser includes:
a seed light source for generating high peak power pulse signal light;
the optical fiber amplifying link is connected with the output end of the seed light source and is used for carrying out optical amplification and frequency domain filtering shaping treatment on the input pulse signal light;
the cone-pulling type (2+1) x 1 active optical fiber combiner is used for coupling the received pumping light to the inner cladding of the optical fiber amplifying link and is used as an output end of an amplifying signal pulse;
the pump laser module is used for providing a pump light signal for the laser; and
the isolator is arranged at the output end of the laser and used for isolating backward return light and protecting the safety of the seed light source.
As a preferred implementation mode of the invention, the seed light source is a 1550nm wave band high-power distributed feedback type DFB chip laser, and an anti-feedback design of a built-in optical isolator is adopted for isolating backward return light of the optical fiber amplifying link so as to protect the seed light source.
As a preferred embodiment of the present invention, the optical fiber amplifying link specifically includes:
the first gain optical fiber and the second gain optical fiber are erbium-ytterbium co-doped double-clad optical fibers, and are connected through a bicolor band-pass filter; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first gain optical fiber has the characteristics of low doping concentration and small core diameter, and the range of the core diameter is 5-8 um, and is used for carrying out pre-amplification treatment on the pulse signal light;
the second gain optical fiber has the characteristics of high doping concentration and large core diameter, and the range of the core diameter is 8-15 um, and is used for carrying out main amplification treatment on the pulse signal light.
As a preferred implementation mode of the invention, the bicolor band-pass filter is a wave plate bicolor filter integrally packaged by optical fibers, and is designed by adopting a wave plate coating process and is used for transmitting forward pulse signal light and reverse pump light simultaneously and filtering ASE noise in a pre-amplification pulse sequence; and the incidence end tail fiber of the bicolor band-pass filter is matched with the first gain fiber, and the emergence end tail fiber of the bicolor band-pass filter is matched with the second gain fiber.
As a preferred embodiment of the invention, the bicolor band-pass filter can select bicolor band-pass filters MM940-1550BPF or bicolor band-pass filter beam splitters MM940-1550TAP+BPF, and the bicolor band-pass filter beam splitters are additionally provided with TAP terminals for outputting a small part of reflected light so as to monitor the state of the laser.
As a preferred embodiment of the present invention, the signal input end tail fiber of the cone-drawing type (2+1) x 1 active optical fiber combiner is the second gain optical fiber, and the signal output end tail fiber of the cone-drawing type (2+1) x 1 active optical fiber combiner is a double-clad optical fiber with a mode field diameter matched with that of the second gain optical fiber.
As a preferred embodiment of the present invention, the pump laser module specifically includes:
the system comprises a first multimode pump laser and a second multimode pump laser, wherein wave bands of the first multimode pump laser and the second multimode pump laser are 940nm, the central wavelength range of output tail fibers of the first multimode pump laser and the second multimode pump laser is 915-970 nm, the maximum pump power of a single tube is 30W, and the pump power of the pump laser module is controlled by changing the model or the length of the second gain fiber, so that the pump proportion range distributed between the first gain fiber and the second gain fiber is 1:1-1:3.
As a preferred embodiment of the invention, the isolator is an on-line isolator, the tail fiber of the isolator is a passive fiber with the mode field diameter matched with that of the second gain fiber, and the output end face is cut by 8 degrees obliquely.
In a preferred embodiment of the present invention, the optical fiber amplifying link is a two-stage or more optical fiber amplifier.
In order to more clearly describe the technical content of the present invention, a further detailed description will be given below with reference to fig. 1 and the detailed embodiment.
As shown in FIG. 1, the pump multiplexing all-fiber pulse laser comprises a seed light source, a fiber amplifying link, (2+1) x 1 active fiber combiner, a pump laser module and an isolator which are sequentially connected along the transmission direction of signal light; the optical fiber amplifying chain consists of a first gain optical fiber, a bicolor band-pass filter and a second gain optical fiber;
the pump laser module emits pump light, the pump light is coupled with the optical fiber amplifying link inner cladding through the (2+1) x 1 active optical fiber combiner, part of the pump light is absorbed by the second gain optical fiber, and the rest of the pump light enters the first gain optical fiber inner cladding after passing through the bicolor band-pass filter and is fully absorbed by the first gain optical fiber.
The seed light source is used for generating high peak power pulse signal light, the pulse signal light is firstly preamplified by the first gain optical fiber, and amplified spontaneous emission ASE noise with wide spectrum characteristics is generated at the same time; finally, the signal light pulse sequence after the second-stage amplification is output through the (2+1) x 1 active optical fiber combiner and the isolator.
As a preferred implementation mode of the invention, the seed light source is a 1550nm wave band high-power DFB chip laser, the maximum peak power reaches 60mW, the repetition frequency tuning range is 100 Hz-1 MHz, and the feedback prevention design of the built-in isolator is adopted to isolate the backward return light of the optical fiber amplifying link and protect the seed light source;
as a preferred embodiment of the invention, the first gain optical fiber and the second gain optical fiber are erbium-ytterbium co-doped double-clad optical fibers and are connected through a bicolor band-pass filter; respectively for pre-amplification and main amplification of the pulse signal light. The first gain optical fiber has the characteristics of low doping concentration and small core diameter, and the range of the core diameter is 5-8 um; the second gain optical fiber has the characteristics of high doping concentration and large core diameter, and the range of the core diameter is 8-15 um. The seed light source is connected with the seed light source and used for pre-amplifying the pulse signal light;
as the preferred implementation mode of the invention, the bicolor band-pass filter MM940-1550BPF is arranged between the first gain optical fiber and the second gain optical fiber, and is used for filtering ASE noise in amplified signal light on one hand and being used as a mode field adapter on the other hand to realize cladding pumping light multistage multiplexing;
as a preferred embodiment of the present invention, the (2+1) ×1 active optical fiber combiner is connected to the second gain optical fiber, and is configured to combine the pump laser with the signal optical fiber;
as a preferred embodiment of the invention, the pump laser module comprises two 940nm wave band first multimode pump lasers and two second multimode pump lasers which are designed in a redundancy way, and the two first multimode pump lasers and the second multimode pump lasers are connected with the (2+1) x 1 active optical fiber combiner and are used for emitting pump laser;
as a preferred embodiment of the invention, the isolator is connected with the (2+1) x 1 active optical fiber combiner and is used for isolating backward return light and ensuring the safety of a seed light source.
The pump multiplexing all-fiber pulse laser of the invention works as follows:
embodiment one: the optical path design diagram of the pump multiplexing all-fiber pulse laser is shown in fig. 1.
The pump multiplexing all-fiber pulse laser comprises a seed light source, a fiber amplifying link, (2+1) x 1 active fiber beam combiner, a pump laser module, an isolator and an output port which are sequentially arranged along the transmission direction of signal light;
the seed light source is a 1550nm high-power distributed feedback type semiconductor DFB chip laser, the maximum peak power of the generated pulse signal light reaches 60mW, the feedback prevention design of the built-in optical isolator is adopted, and the central wavelength of the seed signal light is tuned and stabilized through TEC temperature control.
The optical fiber amplifying chain consists of a first gain optical fiber, a bicolor band-pass filter and a second gain optical fiber;
the first gain optical fiber and the second gain optical fiber are erbium-ytterbium co-doped double-clad optical fibers; the first gain optical fiber has the characteristics of low doping concentration and small core diameter (5-8 mu m); the second gain fiber has the characteristics of high doping concentration and large core diameter (8-15 mu m).
The bicolor band-pass filter is 940/1550nm bicolor band-pass filter, the band-pass wavelength is matched with the pumping wavelength and the signal wavelength simultaneously, the filter is arranged between the first gain optical fiber and the second gain optical fiber and is used for filtering out spontaneous emission noise of an amplifier in the amplified pulse sequence, the filter is used as a mode field adapter, and pumping light is transmitted to realize pump light fraction multiplexing.
The (2+1) x 1 active optical fiber combiner is connected with the second gain optical fiber and is used for combining the pump light and the signal light. The tail fiber model 105/125 of the two paths of pumping end is a second gain fiber, and the tail fiber of the signal input end is a double-clad fiber with the mode field diameter matched with that of the second gain fiber.
The pump laser module comprises two 940nm first multimode pump lasers and two 940nm second multimode pump lasers which are designed in a redundancy mode, and the single-tube maximum output power reaches 30W; the optical fiber amplifying device is connected with a (2+1) x 1 active optical fiber beam-combining pumping fiber to provide a gain source for an optical fiber amplifying link, and the ratio value range of pumping power distributed between a first gain optical fiber and a second gain optical fiber is controlled to be 1:10-1:3 by changing the model or the length of the second gain optical fiber according to actual needs.
The isolator is an on-line isolator, is connected with a signal output tail fiber of the (2+1) x 1 active optical fiber beam combiner, and is used for isolating backward return light to protect the safety of the seed light source 1, and the output end face of the optical fiber is cut by an inclined angle of 8 degrees.
The working mode of this embodiment is as follows:
the high-power DFB seed light source generates 1550nm pulse signal light with high peak power through direct current modulation, and the pulse signal light is directly coupled into a fiber core of an optical fiber amplifying link through a single-mode tail fiber; the high-power 940nm pump light output by the pump laser module is coupled to the inner cladding of the optical fiber amplifying link through a (2+1) x 1 active optical fiber combiner.
In the optical fiber amplification link, 940nm pump light is firstly absorbed by a second gain optical fiber for the most part, and further, the rest 940nm pump light is further coupled into an inner cladding of a first gain optical fiber through a bicolor band-pass filter and is fully absorbed by the first gain optical fiber; the 1550nm pulse signal light is firstly preamplified by the first gain optical fiber, and amplified spontaneous emission ASE noise with wide spectrum characteristics is generated, further, the preamplified pulse sequence is subjected to frequency domain filtering shaping by the double-color band-pass filter, ASE noise in the preamplified pulse sequence is filtered, the preamplified 1550nm pulse signal light with improved signal-to-noise ratio is obtained, and then the preamplified 1550nm pulse signal light enters the second gain optical fiber to be subjected to main amplification, at the moment, the 1550nm pulse signal light energy is large enough, the ASE noise can be effectively restrained in the main amplification process, and low-noise and high-peak power pulse amplification can be realized. Finally, the 1550nm signal light pulse sequence after the second-stage amplification is output through a (2+1) x 1 active optical fiber combiner and an isolator.
Embodiment two: the optical path design diagram of the pump multiplexing all-fiber pulse laser is shown in fig. 2.
In practical application, in order to facilitate after-sales maintenance and fault monitoring, the dual-color band-pass filter MM-940-1550-BPF (filter) in the first embodiment is replaced by the dual-color band-pass filter beam splitter MM140-1550TAP (splitter) +BPF (filter), a reverse TAP end is added for splitting, and a part of reflected ASE is split to be used as monitoring light, so that the state of the laser can be monitored and diagnosed in real time; the rest part is kept unchanged, and the pumping multiplexing all-fiber pulse laser with the additional testing end shown in figure 2 can be obtained.
In practical application, the technical scheme has the following beneficial effects:
1. the high-power DFB chip laser with the integrated isolator feedback-prevention design is used as a seed light source, the high-peak power pulse signal light output of 1550nm wave band can be obtained, the bottleneck that the traditional semiconductor laser can only output a plurality of mW levels of output power can be effectively avoided by using the high-power DFB chip laser as a seed light source of the optical fiber laser, and the peak power of seed light can be increased by one order of magnitude. On the one hand, the high seed optical power can enable the fiber laser to obtain ultra-high power at any wavelength of 1550nm wave band, and can give consideration to ultra-high spectral signal-to-noise ratio, and the wavelength limit is eliminated. On the other hand, the high average power effectively improves the effectiveness of stimulated radiation, greatly improves the conversion efficiency of the amplifier, and meanwhile, the laser chip has larger heat dissipation area, effectively improves the heat dissipation capacity under the condition of large current, and greatly improves the reliability of the chip. Meanwhile, the seed source integrates the isolator, so that the defects that the optical chip is damaged by backward return light, the cost is high, the size is large, the integration is difficult to realize and the like caused by the traditional use of a discrete optical isolator are overcome.
2. The optical fiber integrated wave plate type double-color band-pass filter is adopted, on one hand, cladding pumping light and fiber core signal light can be transmitted simultaneously, and the narrow-band filtering characteristic of the optical fiber integrated wave plate type double-color band-pass filter can effectively inhibit ASE noise accompanied by pulse amplification, so that the spectral signal-to-noise ratio of the output pulse of the amplifier is improved. On the other hand, the optical fiber can be equivalent to a mode field adapter, and the reverse pump light is transmitted, so that the multistage multiplexing of pump power is realized, the optical path structure is simplified, and the light-light conversion efficiency of the system is improved. Compared with the existing temperature-sensitive FBG narrow-band filter, the technical scheme has the outstanding technical advantages that the temperature is insensitive, and the application requirements of application scenes with large temperature fluctuation ranges of working environments can be met.
3. The active optical fiber combiner with the cone-shaped (2+1) multiplied by 1 is adopted, namely, the welding point of the active optical fiber and the passive optical fiber is arranged inside the combiner, so that the process that the traditional combiner needs to weld the round cladding passive optical fiber and the octagonal cladding active optical fiber outside is avoided, the welding loss is effectively reduced, and the light and light efficiency is improved. Meanwhile, the welding point is used as a leakage point, and the process of repeatedly coating low-folding glue or externally and independently packaging devices is not needed, so that the complexity and the production time of the production process are greatly reduced, the cost is effectively reduced, and the reliability is improved. In addition, the beam combiner adopts a tapering process, can bear high pumping power, overcomes the defects of low bearing power and film damage tolerance of the wave plate type wavelength division multiplexer, and greatly improves the service life and reliability of the wave plate type wavelength division multiplexer.
4. By adopting a double-pump redundancy design, the following flexible pump working mode can be supported: (1) when one pump fails, the operation is automatically switched to the second pump; (2) any pumping work is distributed according to the pumping service condition in the starting process through the control logic; (3) the two pumps work simultaneously, i.e. the output power of the two pumps is equivalent to half the power of the single pump. The reliability of the equipment can be greatly improved through the three working modes.
5. The invention adopts a backward pumping multiplexing structure, the signal light power and the pumping light power in the optical fiber amplifying link are positively correlated along the gain optical fiber distribution, the invention has higher gain saturation threshold and higher pumping utilization efficiency, is favorable for fully extracting the gain of the amplifier, and the pumping fraction multiplexing design reduces the investment of a pumping source, so that the optical path is simplified and the cost is compressed.
6. A dual-color band-pass filter beam splitter is introduced, and a TAP (TAP) end is added for outputting a small part of backward light so as to monitor the state of the amplifier, so that the real-time state of the optical fiber amplifier can be effectively judged. And the production detection and after-sales maintenance are convenient.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
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 pump multiplexing all-fiber pulse laser adopts a highly integrated high-power DFB chip and isolator integrated packaging seed source scheme to realize pulse seed light injection with peak power increased by one order of magnitude, and can obtain high peak power output at any wavelength of 1550nm wave band and high signal to noise ratio. And secondly, the waveplate type double-color band-pass filter is adopted to realize narrow-band filtering with stable and reliable center wavelength temperature, so that the pulse signal-to-noise ratio and the environmental adaptability are further improved, meanwhile, the multiplexing of the pump power fractions is realized, the pump utilization efficiency is effectively improved, the equipment size and the manufacturing cost are reduced, and the production efficiency is improved. In addition, the operation reliability and the safety characteristic of the fiber laser are effectively improved by adopting a double-pump redundancy design. The technical scheme integrates the advantages of low manufacturing cost, high peak power, ultra-high signal-to-noise ratio, temperature stability and the like, and is suitable for a terminal laser radar system.
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 (9)
1. A pump multiplexed all-fiber pulse laser, said laser comprising:
a seed light source for generating high peak power pulse signal light;
the optical fiber amplifying link is connected with the output end of the seed light source and is used for carrying out optical amplification and frequency domain filtering shaping treatment on the input pulse signal light;
the cone-pulling type (2+1) x 1 active optical fiber combiner is used for coupling the received pumping light to the inner cladding of the optical fiber amplifying link and is used as an output end of an amplifying signal pulse;
the pump laser module is used for providing a pump light signal for the laser; and
the isolator is arranged at the output end of the laser and used for isolating backward return light and protecting the safety of the seed light source.
2. The pump multiplexing all-fiber pulse laser according to claim 1, wherein the seed light source is a 1550nm band high-power distributed feedback type DFB chip laser, and an anti-feedback design of a built-in optical isolator is adopted to isolate the backward return light of the optical fiber amplifying link and protect the seed light source.
3. The pump multiplexing all-fiber pulsed laser of claim 1, wherein said fiber amplification link comprises:
the first gain optical fiber and the second gain optical fiber are erbium-ytterbium co-doped double-clad optical fibers, and are connected through a bicolor band-pass filter; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first gain optical fiber has the characteristics of low doping concentration and small core diameter, and the range of the core diameter is 5-8 um, and is used for carrying out pre-amplification treatment on the pulse signal light;
the second gain optical fiber has the characteristics of high doping concentration and large core diameter, and the range of the core diameter is 8-15 um, and is used for carrying out main amplification treatment on the pulse signal light.
4. The pump multiplexing all-fiber pulse laser according to claim 3, wherein the bicolor band-pass filter is a waveplate bicolor filter of an optical fiber integrated package, and is designed by adopting waveplate coating technology, and is used for transmitting forward pulse signal light and reverse pump light simultaneously and filtering ASE noise in a pre-amplification pulse sequence; and the incidence end tail fiber of the bicolor band-pass filter is matched with the first gain fiber, and the emergence end tail fiber of the bicolor band-pass filter is matched with the second gain fiber.
5. The pump multiplexing all-fiber pulse laser according to claim 4, wherein the dichroic band-pass filter can select a dichroic band-pass filter MM940-1550BPF or a dichroic band-pass filter beam splitter MM940-1550tap+bpf, and the dichroic band-pass filter beam splitter is additionally provided with a TAP terminal for outputting a small part of reflected light so as to monitor the state of the laser.
6. The pump multiplexing all-fiber pulse laser according to claim 3, wherein the signal input end tail fiber of the pull-cone (2+1) x 1 active fiber combiner is the second gain fiber, and the signal output end tail fiber of the pull-cone (2+1) x 1 active fiber combiner is a double-clad fiber with a mode field diameter matched with the second gain fiber.
7. The pump multiplexing all-fiber pulse laser according to claim 6, wherein the pump laser module specifically comprises:
the system comprises a first multimode pump laser and a second multimode pump laser, wherein wave bands of the first multimode pump laser and the second multimode pump laser are 940nm, the central wavelength range of output tail fibers of the first multimode pump laser and the second multimode pump laser is 915-970 nm, the maximum pump power of a single tube is 30W, and the pump power of the pump laser module is controlled by changing the model or the length of the second gain fiber, so that the pump proportion range distributed between the first gain fiber and the second gain fiber is 1:1-1:3.
8. The pump multiplexing all-fiber pulse laser according to claim 7, wherein the isolator is an on-line isolator, the tail fiber of the isolator is a passive fiber with the mode field diameter matched with that of the second gain fiber, and the output end face is cut by 8 degrees.
9. The pump multiplexing all-fiber pulse laser according to claim 1, wherein the fiber amplifying link is a two-stage or more fiber amplifier.
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| CN117375724A (en) * | 2023-12-06 | 2024-01-09 | 华海通信技术有限公司 | Underwater equipment and communication system |
| CN117375724B (en) * | 2023-12-06 | 2024-03-19 | 华海通信技术有限公司 | Underwater equipment and communication system |
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