CN111490444A - Pulse optical fiber amplifier and optical signal power amplification method - Google Patents
Pulse optical fiber amplifier and optical signal power amplification method Download PDFInfo
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- CN111490444A CN111490444A CN202010268326.8A CN202010268326A CN111490444A CN 111490444 A CN111490444 A CN 111490444A CN 202010268326 A CN202010268326 A CN 202010268326A CN 111490444 A CN111490444 A CN 111490444A
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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
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
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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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Abstract
The embodiment of the application discloses a pulse fiber amplifier, includes: the photoelectric detection unit on the input side, the amplification unit of the pre-amplification stage, the amplification unit of at least one power amplification stage and the photoelectric detection unit on the output side; the photoelectric detection unit at the input side is connected with the amplification unit at the pre-amplifier stage through a double-clad erbium-ytterbium co-doped fiber; the pre-amplifier stage amplification unit is connected with the first-stage power amplifier stage amplification unit through a double-clad erbium-ytterbium co-doped optical fiber, and the final-stage power amplifier stage amplification unit is connected with the output side photoelectric detection unit through a light path; the output end of the multimode pump laser is connected with the input end of the multimode pump beam splitter; the multimode pump beam splitter splits the pump light of the multimode pump laser into at least two paths; one path of the split pump light is output to the pre-amplifier stage amplification unit, and the rest pump light in the split pump light is output to each power amplifier stage amplification unit respectively. The embodiment of the application also discloses an optical signal power amplification method.
Description
Technical Field
The embodiment of the application relates to a pulse optical fiber amplifier based on multimode pumping and a multimode pumping beam splitter and an optical signal power amplification method.
Background
The conventional pulse fiber amplifier generally adopts a two-stage or multi-stage structure in order to improve the output pulse peak power and ensure a certain output signal-to-noise ratio, and mainly comprises a pre-amplifier stage formed by a single-mode pump laser and a single-mode active fiber, and a power amplifier stage formed by a multimode pump and a double-cladding active fiber, wherein the multi-stage power amplifier stage is sometimes included in order to amplify the pulse peak power to obtain higher pulse peak power.
The conventional pulsed fiber amplifier generally uses a single-mode fiber doped with erbium ions in the fiber core as an active fiber, and thus can only be pumped by a fiber core pumping method using a single-mode pump laser. Because the absorption spectrum of erbium ions is located near 9xxnm, a single-mode 9xxnm pump laser is generally used as a pump source in a pre-amplifier stage of a conventional pulse fiber amplifier, and a single-mode active erbium-doped fiber is pumped by a single-mode wavelength division multiplexer, so that the peak power of a pulse signal is initially improved.
The power amplifier stage of the conventional pulse fiber amplifier generally uses a multimode 9xxnm pump laser as a pump source, a multimode pump-signal beam combiner pumps the double-cladding active fiber, and the peak power of a pulse signal output by the preamplifier stage is obviously improved after the pulse signal is amplified by the power amplifier stage.
The two-stage or multi-stage structure of the conventional pulse optical fiber amplifier has the advantages that the structure of two-stage or multi-stage hierarchical amplification is adopted, so that higher pulse peak power can be ensured to be obtained, better optical signal-to-noise ratio can be obtained, the optical conversion efficiency of pumping-pulse signal light of the amplifier is ensured to be kept at a higher level, and the overall power consumption of the amplifier is reduced.
Although the advantages of the multi-stage structure of the conventional pulse fiber amplifier are obvious, the problems of excessive pumping quantity and types, complex circuit and control design, large overall size and power consumption of the pulse amplifier and the like exist, and the cost is always high.
Disclosure of Invention
In view of this, the embodiments of the present application provide a pulse fiber amplifier, which can effectively simplify the structure of the existing amplifier and significantly improve the output pulse peak power.
The embodiment of the application provides a pulse fiber amplifier, including: the photoelectric detection unit on the input side, the amplification unit of the pre-amplification stage, the amplification unit of at least one power amplification stage and the photoelectric detection unit on the output side;
the input side photoelectric detection unit and the pre-amplifier stage amplification unit are connected through a double-clad erbium-ytterbium co-doped fiber; the pre-amplification stage amplification unit is connected with a first-stage power amplification stage amplification unit in the at least one power amplification stage amplification unit through a double-clad erbium-ytterbium co-doped optical fiber, and a last-stage power amplification stage amplification unit in the at least one power amplification stage amplification unit is connected with the output side photoelectric detection unit through an optical path;
a multimode pump laser for outputting pump light; the output end of the multimode pump laser is connected with the input end of the multimode pump beam splitter;
the multimode pump beam splitter is used for splitting the pump light of the multimode pump laser into at least two paths; one of the at least two paths of split pump light is output to the pre-amplifier stage amplification unit, and the rest pump light in the at least two paths of split pump light is output to the at least one power amplifier stage amplification unit respectively, so that each power amplifier stage amplification unit is connected with one split pump light.
As an implementation manner, each of the at least one power amplifier stage amplifying unit is connected to the pump light splitting interface of the multimode pump beam splitter through a delay fiber.
As one implementation manner, the pre-amplifier stage amplification unit includes a pre-amplifier stage pump-signal combiner and a pre-amplifier stage optical isolator, and the pre-amplifier stage pump-signal combiner and the pre-amplifier stage optical isolator are connected through an optical path;
the power amplifier stage amplification unit comprises a power amplifier stage pumping-signal wave combiner and a power amplifier stage optical isolator, and the pumping-signal wave combiner is connected with the power amplifier stage optical isolator through a light path.
As one implementation manner, the input side photoelectric detection unit comprises a pre-amplifier stage coupler, a pre-amplifier stage optical isolator and a pre-amplifier stage photoelectric detector;
the input end of the pre-amplifier stage coupler is connected with an input optical path, the first output end of the pre-amplifier stage coupler is connected with the input end of the pre-amplifier stage optical isolator, and the second output end of the pre-amplifier stage coupler is connected with the input end of the pre-amplifier stage photoelectric detector; the output end of the pre-amplifier stage optical isolator is connected with the common end of the pre-amplifier stage pump-signal combiner through a double-clad erbium-ytterbium co-doped fiber;
the output side photoelectric detection unit comprises a power amplifier coupler and a power amplifier photoelectric detector;
the input of power amplifier stage coupler with the output of power amplifier stage optical isolator of final stage power amplifier stage amplification unit is connected, the first output and the output light path of power amplifier stage coupler are connected, the second output of power amplifier stage coupler with power amplifier stage photoelectric detector's output is connected.
As an implementation manner, one of the split lights of the multimode pump beam splitter is connected to the pump end of the pre-amplifier stage pump-signal combiner, and the common end of the pre-amplifier stage pump-signal combiner is connected to the output end of the pre-amplifier stage optical isolator through a double-clad erbium-ytterbium co-doped fiber; the signal end of the pre-amplifier stage pumping-signal combiner is connected with the input end of the pre-amplifier stage optical isolator;
the residual optical path in the split light of the multimode pump beam splitter is connected with the pump end of the power amplifier stage pump-signal beam combiner through a delay optical fiber, the common end of the power amplifier stage pump-signal beam combiner is connected with the output end of the power amplifier stage isolator of the previous power amplifier stage amplification unit or the output end of the pre-amplifier stage isolator of the pre-amplifier stage amplification unit through a double-clad erbium-ytterbium co-doped optical fiber, and the signal end of the power amplifier stage pump-signal beam combiner is connected with the input end of the power amplifier stage isolator of the power amplifier stage amplification unit.
As an implementation manner, when there is one power amplifier stage amplification unit, the pre-amplifier stage amplification unit is connected to the power amplifier stage amplification unit through a double-clad erbium-ytterbium co-doped fiber, and the power amplifier stage amplification unit is directly connected to the output side photoelectric detection unit through an optical path.
As an implementation manner, the multimode pump beam splitter splits pump light of the multimode pump laser into two paths, wherein one path of the pump light is output to a pump end of a pre-amplifier pump-signal beam combiner of the pre-amplifier amplifying unit, and a common end of the pre-amplifier pump-signal beam combiner is connected with an output end of the pre-amplifier optical isolator through a pre-amplifier double-clad erbium-ytterbium co-doped fiber; the signal end of the pre-amplifier stage pumping-signal beam combiner is connected with the input end of the isolator of the pre-amplifier stage amplifying unit; the other end of the pre-amplifier stage double-clad erbium-ytterbium co-doped fiber is connected with the output end of an isolator of the input side photoelectric detection unit, the input end of the isolator of the input side photoelectric detection unit is connected with the first end of a coupler of the input side photoelectric detection unit, and the second end of the coupler of the input side photoelectric detection unit is connected with the input end of the pre-amplifier stage photoelectric detector;
the multimode pump beam splitter inputs the other path of the pump split light to the pump end of the pump-signal beam combiner of the power amplifier stage amplification unit through a delay optical fiber, the common end of the pump-signal beam combiner of the power amplifier stage amplification unit is connected with the output end of the isolator of the pre-amplifier stage amplification unit through the double-clad erbium-ytterbium co-doped fiber of the power amplifier stage, the signal end of the pumping-signal beam combiner of the power amplifier stage amplification unit is connected with the input end of the isolator of the power amplifier stage amplification unit, the output end of the isolator of the power amplifier stage amplifying unit is connected with the input end of the coupler of the power amplifier stage photoelectric detector, the first end of the coupler of the power amplifier stage photoelectric detection unit is connected with the output light path, and the second end of the coupler of the power amplifier stage photoelectric detection unit is connected with the output end of the power amplifier stage photoelectric detector.
The embodiment of the application also provides an optical signal power amplification method, which adopts the pulse optical fiber amplifier to carry out power amplification on the input optical signal.
According to the pulse optical fiber amplifier, the whole amplifier only uses one multimode pump laser and one multimode pump beam splitter for pumping, the design is simplified, meanwhile, the pulse peak power output by the preamplifier stage is greatly improved, and higher pulse peak power can be obtained. In order to prevent the spontaneous emission power in the active fiber from being too high to form lasing damage to the pulse fiber amplifier of the embodiment of the application, delay fibers with different lengths are arranged between the multimode pump beam splitter and each level of signal-pump beam combiner, so that the reliability of the amplifier is ensured. The whole pulse amplifier is only provided with one multimode pump laser for pumping, and has the advantages of simple structure, lower power consumption, simple control, reduced manufacturing cost and reduced volume of the whole pulse amplifier.
Drawings
Fig. 1 is a schematic structural diagram of a pulse fiber amplifier according to an embodiment of the present disclosure;
fig. 2 is a schematic view of another structure of the pulse fiber amplifier according to the embodiment of the present application.
Description of the figure numbers:
1,13, 15, 31: a coupler;
2,14, 16, 32: a photodetector;
3,6, 12, 17, 20, 26, 30: an optical isolator;
4,9, 18, 21, 27: double-clad erbium-ytterbium co-doped fiber;
5,11, 19, 22, 29: a pump-signal combiner;
7: 1 × 2 multimode pump beam splitter;
a 24: 1 × N multimode pump beam splitter;
8,25: a multimode pump laser;
10, 23, 28: a delay fiber.
Detailed Description
The essence of the technical solution of the embodiments of the present application is explained in detail below with reference to the accompanying drawings.
In the embodiment of the application, the pre-amplifier structure in the conventional pulse fiber amplifier is changed into the multimode pump and the double-cladding active fiber by the single-mode pump and the single-mode active fiber, and the changed pulse fiber amplifier can not be limited by insufficient single-mode pump power and low injection power of the fiber core pump active fiber pump, so that the pulse peak power output by the pre-amplifier structure of the pulse fiber amplifier can be greatly improved, and a certain output optical signal-to-noise ratio is ensured.
The multimode pump laser has the characteristics of small volume and high output power, and the embodiment of the application makes full use of the characteristics of the multimode pump laser, and the multimode pump laser with larger output power is split by the multimode beam splitter and is respectively input into the pump-signal combiner of the pre-amplifier stage and the power amplifier stage of the pulse fiber amplifier to be used as the pre-amplifier stage and the power amplifier stage of the pump pulse fiber laser.
In addition, the pump-on sequence of the pump in the pulse fiber amplifier is crucial, the pump in the conventional pulse fiber amplifier is generally turned on sequentially, the pulse signal is injected into the active fiber before the pump light, and if the pump light is injected into the active fiber before the pulse signal, the performance of the pulse fiber amplifier may be degraded or even damaged. When the pump light is injected into the active fiber before the pulse signal, two situations easily occur, namely: if only the pump light but not the signal light exists in the active optical fiber, the upper-level inversion particles in the active optical fiber are consumed by the spontaneous radiation in the optical fiber, so that the pulse signal cannot be amplified due to the low number of the inversion particles after being injected into the active optical fiber; case two: if the spontaneous radiation power level in the active optical fiber is high and devices in the optical fiber or at two ends of the optical fiber have high reflection surfaces, a lasing phenomenon easily occurs, and a pump and passive devices are damaged. According to the pulse fiber laser, only one pump laser is used, in order to ensure that signal light is injected into an active fiber before pump light, delay fibers with different lengths are added at each output end of a multimode pump beam splitter and the input end of a pump-signal combiner of each power amplifier stage, the length of each delay fiber is matched with the transmission delay of pulse signal light, the signal light and the pump light are ensured to be injected into the active fiber at the same time, and the two situations are avoided.
The embodiment of the application can also use a high-power multimode pump laser to be subjected to light splitting through a 1 × N multi-path multimode coupler and then simultaneously input to the pre-amplifier stage and the multi-stage power amplifier stage of the pump pulse optical fiber amplifier, the splitting ratio of each path of the 1 × N multi-path multimode coupler can be adjusted according to the design requirements of an optical path, delay optical fibers with different lengths are respectively connected between the output end of the 1 × N multi-path multimode coupler and the pump-signal input end of the pre-amplifier stage and the multi-stage power amplifier stage, and the length of each delay optical fiber is determined by the time delay of signal transmission.
The essence of the technical solution of the embodiments of the present application is further explained below with reference to the drawings.
The embodiment of the application provides a pulse fiber amplifier, including: the photoelectric detection unit on the input side, the amplification unit of the pre-amplification stage, the amplification unit of at least one power amplification stage and the photoelectric detection unit on the output side;
in the embodiment of the application, the number of the power amplification stage amplification units is at least one, or more than two, and the amplification stages of the pulse optical fiber amplifier can be set as required to set a plurality of power amplification stage amplification units.
In the embodiment of the application, the amplifying unit of the pre-amplifier stage comprises a pre-amplifier stage pumping-signal combiner and a pre-amplifier stage optical isolator, wherein the pre-amplifier stage pumping-signal combiner is connected with the pre-amplifier stage optical isolator through an optical path; the power amplifier stage amplification unit comprises a power amplifier stage pumping-signal wave combiner and a power amplifier stage optical isolator, and the pumping-signal wave combiner is connected with the optical isolator through an optical path.
The input side photoelectric detection unit and the pre-amplifier stage amplification unit are connected through a double-clad erbium-ytterbium co-doped fiber; the pre-amplification stage amplification unit is connected with a first-stage power amplification stage amplification unit in the at least one power amplification stage amplification unit through a double-clad erbium-ytterbium co-doped optical fiber, and a last-stage power amplification stage amplification unit in the at least one power amplification stage amplification unit is connected with the output side photoelectric detection unit through an optical path;
a multimode pump laser for outputting pump light; the output end of the multimode pump laser is connected with the input end of the multimode pump beam splitter;
the multimode pump beam splitter is used for splitting the pump light of the multimode pump laser into at least two paths; one of the at least two paths of split pump light is output to the pre-amplifier stage amplification unit, and the rest pump light in the at least two paths of split pump light is output to the at least one power amplifier stage amplification unit respectively, so that each power amplifier stage amplification unit is connected with one split pump light.
The input side photoelectric detection unit comprises a pre-amplifier stage coupler, a pre-amplifier stage optical isolator and a pre-amplifier stage photoelectric detector;
the input end of the pre-amplifier stage coupler is connected with an input optical path, the first output end of the pre-amplifier stage coupler is connected with the input end of the pre-amplifier stage optical isolator, and the second output end of the pre-amplifier stage coupler is connected with the input end of the pre-amplifier stage photoelectric detector; the output end of the pre-amplifier stage optical isolator is connected with the common end of the pre-amplifier stage pump-signal combiner through a double-clad erbium-ytterbium co-doped fiber;
the output side photoelectric detection unit comprises a power amplifier coupler and a power amplifier photoelectric detector;
the input of power amplifier stage coupler with the output of power amplifier stage optical isolator of final stage power amplifier stage amplification unit is connected, the first output and the output light path of power amplifier stage coupler are connected, the second output of power amplifier stage coupler with power amplifier stage photoelectric detector's output is connected.
Fig. 1 is a schematic diagram of a composition structure of a pulse fiber amplifier provided in an embodiment of the present application, and as shown in fig. 1, the pulse fiber amplifier in the embodiment of the present application only includes a first-stage power amplifier stage amplification unit, and the structure includes: the multimode pump laser system comprises a multimode pump laser 8, a multimode pump beam splitter 7, an isolator 3, a photoelectric detector 2, a coupler 1, a pump-signal beam combiner 5, an isolator 3, a pump-signal beam combiner 11, an isolator 12, a coupler 13 and a photoelectric detector 14, wherein the output end of the multimode pump laser 8 is connected with the input end of the multimode pump beam splitter 7, the multimode pump beam splitter 7 splits multimode pump light according to design requirements in any proportion, and the multimode pump beam splitter 7 splits the multimode pump light of the multimode pump laser 8 into two paths in the example; one output of the multimode pump beam splitter 7 is connected with a pump end of a pump-signal combiner 5, a common end of the pump-signal combiner 5 is connected with a preventive-level double-clad erbium-ytterbium co-doped fiber 4, a signal end of the pump-signal combiner 5 is connected with an input of a preventive-level output isolator 6, the other end of the preventive-level double-clad erbium-ytterbium co-doped fiber 4 is connected with an output of a preventive-level input isolator 3, an input end of the isolator 3 is connected with a large end (a first output end) of a preventive-level input coupler 1, a small end (a second output end) of the input coupler 1 is connected with an input PIN PIN of a preventive-level photoelectric detector 2, and signal light is input from the input end and is output from the isolator 6 after being amplified by the preventive level; the other optical splitting path of the multimode pump beam splitter 7 passes through a multimode delay fiber 10 and then is input to the pump end of a pump-signal combiner 11, the common end of the pump-signal combiner 11 is connected to a double-clad erbium-ytterbium co-doped fiber 9 of the power amplifier stage, the other end of the double-clad erbium-ytterbium co-doped fiber 9 is connected to the output end of the prevention-stage output isolator 6, the signal end of the pump-signal combiner 11 is connected to the input end of an output isolator 12 of the power amplifier stage, the output end of the isolator 12 is connected to the input end of an output coupler 13, the small end (second output end) of the output coupler 13 is connected to an output PIN of a photodetector 14, the large end (first output end) of the output coupler 13 serves as the output of a pulse fiber amplifier, and the pulse fiber amplifier in this example serves as the power amplifier stage of a two-stage pulse fiber amplifier. In fig. 1, the input PINs PIN of the coupler 1 and the photodetector 2, and the output PINs PIN of the coupler 12 and the photodetector 14 are respectively input detection and output detection of the module, which is convenient for monitoring and managing the pulse optical fiber amplifier according to the embodiment of the present application.
Fig. 2 is a schematic view of another structure of the pulse fiber amplifier according to the embodiment of the present disclosure, and as shown in fig. 2, the pulse fiber amplifier according to the embodiment of the present disclosure includes more than two stages of power amplifier stage amplification units, specifically, how many stages of power amplifier stage amplification units are arranged, which can be set according to actual optical signal amplification requirements, and at this time, the multimode pump beam splitter splits a corresponding amount of pump light from the multimode pump laser according to the number of the power amplifier stage amplification units; the pulse fiber amplifier of the present example includes: the multi-mode pump laser comprises a multi-mode pump laser 25, a multi-mode pump beam splitter 24, an isolator 3, a photoelectric detector 16, a coupler 15, a pump-signal beam combiner 19, an isolator 20, a pump-signal beam combiner 22, an isolator 26, a pump-signal beam combiner 29, an isolator 30, a coupler 31 and a photoelectric detector 32, wherein the output end of the multi-mode pump laser 25 is connected with the input end of the multi-mode pump beam splitter 24, and the multi-mode pump beam splitter 24 splits the multi-mode pump light according to the total number of pre-amplifier stage amplification units and power amplifier stage amplification units, so that each amplification unit is guaranteed to have the split pump light. One output of the light splitting path of the multimode pump beam splitter 24 is connected to the pump end of the pump-signal combiner 19, the common end of the pump-signal combiner 19 is connected to the double-clad erbium-ytterbium co-doped fiber 18 of the preventive stage, the signal end of the pump-signal combiner 19 is connected to the input of the output isolator 20 of the preventive stage, the other end of the double-clad erbium-ytterbium co-doped fiber 18 of the preventive stage is connected to the output of the input isolator 17 of the preventive stage, the input end of the isolator 17 is connected to the large end (first output end) of the input coupler 15 of the preventive stage, the small end (second output end) of the input coupler 15 is connected to the input PIN of the photodetector 16 of the preventive stage, and the signal light is input from the input end and output from the isolator 20 after being amplified by the preventive stage; the remaining light splitting paths of the multimode pump beam splitter 24 are respectively input to the pump ends of the pump-signal combiner 22 and the pump-signal combiner 30 through multimode delay fibers 23 and 28, the common ends of the pump-signal combiner 22 and the pump-signal combiner 30 are respectively connected to the double-clad erbium-ytterbium co-doped fibers 21 and 27 of the power amplifier stage, the other ends of the double-clad erbium-ytterbium co-doped fibers 21 and 27 are respectively connected to the output end of the output isolator 20 of the prevention stage and the isolator in the amplification unit of the previous power amplifier stage, the signal ends of the pump-signal combiner 22 and the pump-signal combiner 30 are respectively connected to the input end of the output isolator 26 of the power amplifier stage and the output isolator in the amplification unit of the next power amplifier stage, the signal end of the pump-signal combiner 30 in the amplification unit of the last power amplifier stage is connected to the isolator 30, the output end of the isolator 30 is connected to the input end of the output coupler 31, the small end (second output end) of the output coupler 31 is connected to the output PIN of the photodetector 32, and the large end (first output end) of the output coupler 31 serves as the output of the pulse fiber amplifier, which serves as the power amplifier stage of the multi-stage pulse fiber amplifier in this example.
In fig. 2, the function of each component of the multimode pump laser is identical to that shown in fig. 1. The difference is that the whole optical path structure includes N-stage amplification, the multimode pump signal is also divided into N stages by a plurality of cascaded multimode pump beam splitters 24 to pump each stage, and each stage has a multimode delay fiber with a specific length.
In the embodiment of the present application, the photodetection optical paths where the photodetectors 2 and 16 are located constitute the input-side photodetection unit, and the photodetection optical paths where the photodetectors 14 and 32 are located constitute the output-side photodetection unit. The components included in the pre-amplifier stage amplification unit and the power amplifier stage amplification unit are roughly divided according to corresponding functions, and those skilled in the art should understand that the pre-amplifier stage amplification unit and the power amplifier stage amplification unit may also be divided according to other ways, and corresponding technical means substitutions are all included in the acquaintable scope of the embodiments of the present application without affecting the essence of the technical scheme of the embodiments of the present application.
According to the pulse optical fiber amplifier, the whole amplifier only uses one multimode pump laser and one multimode pump beam splitter for pumping, the design is simplified, meanwhile, the pulse peak power output by the preamplifier stage is greatly improved, and higher pulse peak power can be obtained. In order to prevent the spontaneous emission power in the active fiber from being too high to form lasing damage to the pulse fiber amplifier of the embodiment of the application, delay fibers with different lengths are arranged between the multimode pump beam splitter and each level of signal-pump beam combiner, so that the reliability of the amplifier is ensured. The whole pulse amplifier is only provided with one multimode pump laser for pumping, and has the advantages of simple structure, lower power consumption, simple control, reduced manufacturing cost and reduced volume of the whole pulse amplifier.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of the unit is only one logical function division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A pulsed fiber amplifier, comprising: the photoelectric detection unit on the input side, the amplification unit of the pre-amplification stage, the amplification unit of at least one power amplification stage and the photoelectric detection unit on the output side;
the input side photoelectric detection unit and the pre-amplifier stage amplification unit are connected through a double-clad erbium-ytterbium co-doped fiber; the pre-amplification stage amplification unit is connected with a first-stage power amplification stage amplification unit in the at least one power amplification stage amplification unit through a double-clad erbium-ytterbium co-doped optical fiber, and a last-stage power amplification stage amplification unit in the at least one power amplification stage amplification unit is connected with the output side photoelectric detection unit through an optical path;
a multimode pump laser for outputting pump light; the output end of the multimode pump laser is connected with the input end of the multimode pump beam splitter;
the multimode pump beam splitter is used for splitting the pump light of the multimode pump laser into at least two paths; one of the at least two paths of split pump light is output to the pre-amplifier stage amplification unit, and the rest pump light in the at least two paths of split pump light is output to the at least one power amplifier stage amplification unit respectively, so that each power amplifier stage amplification unit is connected with one split pump light.
2. The pulsed fiber amplifier of claim 1, wherein each of said at least one power amplifier stage amplification unit is connected to the pump light splitting interface of said multimode pump beam splitter by a delay fiber.
3. The pulsed fiber amplifier of claim 2, wherein said pre-amplifier stage amplification unit comprises a pre-amplifier stage pump-signal combiner and a pre-amplifier stage optical isolator, said pre-amplifier stage pump-signal combiner and said pre-amplifier stage optical isolator optically connected;
the power amplifier stage amplification unit comprises a power amplifier stage pumping-signal wave combiner and a power amplifier stage optical isolator, and the pumping-signal wave combiner is connected with the power amplifier stage optical isolator through a light path.
4. The pulsed fiber amplifier of claim 3, wherein the input-side photodetection unit comprises a pre-amplifier stage coupler, a pre-amplifier stage opto-isolator, and a pre-amplifier stage photodetector;
the input end of the pre-amplifier stage coupler is connected with an input optical path, the first output end of the pre-amplifier stage coupler is connected with the input end of the pre-amplifier stage optical isolator, and the second output end of the pre-amplifier stage coupler is connected with the input end of the pre-amplifier stage photoelectric detector; the output end of the pre-amplifier stage optical isolator is connected with the common end of the pre-amplifier stage pump-signal combiner through a double-clad erbium-ytterbium co-doped fiber;
the output side photoelectric detection unit comprises a power amplifier coupler and a power amplifier photoelectric detector;
the input of power amplifier stage coupler with the output of power amplifier stage optical isolator of final stage power amplifier stage amplification unit is connected, the first output and the output light path of power amplifier stage coupler are connected, the second output of power amplifier stage coupler with power amplifier stage photoelectric detector's output is connected.
5. The pulsed fiber amplifier of claim 4,
one path of split light of the multimode pumping beam splitter is connected with a pumping end of the pre-amplifier stage pumping-signal combiner, and a common end of the pre-amplifier stage pumping-signal combiner is connected with an output end of the pre-amplifier stage optical isolator through a double-clad erbium-ytterbium co-doped fiber; the signal end of the pre-amplifier stage pumping-signal combiner is connected with the input end of the pre-amplifier stage optical isolator;
the residual optical path in the split light of the multimode pump beam splitter is connected with the pump end of the power amplifier stage pump-signal beam combiner through a delay optical fiber, the common end of the power amplifier stage pump-signal beam combiner is connected with the output end of the power amplifier stage isolator of the previous power amplifier stage amplification unit or the output end of the pre-amplifier stage isolator of the pre-amplifier stage amplification unit through a double-clad erbium-ytterbium co-doped optical fiber, and the signal end of the power amplifier stage pump-signal beam combiner is connected with the input end of the power amplifier stage isolator of the power amplifier stage amplification unit.
6. The pulse fiber amplifier of claim 4, wherein when there is one amplifying unit, the amplifying unit of the pre-amplifying stage and the amplifying unit of the amplifying stage are connected by a double-clad erbium-ytterbium co-doped fiber, and the amplifying unit of the amplifying stage and the output-side photodetecting unit are directly connected by an optical path.
7. The pulsed optical fiber amplifier of claim 6,
the multimode pump beam splitter splits the pump light of the multimode pump laser into two paths, wherein one path of the pump light is output to the pump end of a pre-amplifier pump-signal beam combiner of the pre-amplifier amplifying unit, and the common end of the pre-amplifier pump-signal beam combiner is connected with the output end of the pre-amplifier optical isolator through a pre-amplifier double-clad erbium-ytterbium co-doped fiber; the signal end of the pre-amplifier stage pumping-signal beam combiner is connected with the input end of the isolator of the pre-amplifier stage amplifying unit; the other end of the pre-amplifier stage double-clad erbium-ytterbium co-doped fiber is connected with the output end of an isolator of the input side photoelectric detection unit, the input end of the isolator of the input side photoelectric detection unit is connected with the first end of a coupler of the input side photoelectric detection unit, and the second end of the coupler of the input side photoelectric detection unit is connected with the input end of the pre-amplifier stage photoelectric detector;
the multimode pump beam splitter inputs the other path of the pump split light to the pump end of the pump-signal beam combiner of the power amplifier stage amplification unit through a delay optical fiber, the common end of the pump-signal beam combiner of the power amplifier stage amplification unit is connected with the output end of the isolator of the pre-amplifier stage amplification unit through the double-clad erbium-ytterbium co-doped fiber of the power amplifier stage, the signal end of the pumping-signal beam combiner of the power amplifier stage amplification unit is connected with the input end of the isolator of the power amplifier stage amplification unit, the output end of the isolator of the power amplifier stage amplifying unit is connected with the input end of the coupler of the power amplifier stage photoelectric detector, the first end of the coupler of the power amplifier stage photoelectric detection unit is connected with the output light path, and the second end of the coupler of the power amplifier stage photoelectric detection unit is connected with the output end of the power amplifier stage photoelectric detector.
8. A method of optical signal power amplification, the method comprising: power amplifying an input optical signal using the pulsed optical fiber amplifier of any one of claims 1 to 7.
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