Erbium-ytterbium co-doped fiber oblique efficiency test system, test method and laser

Abstract

The invention provides an erbium-ytterbium co-doped fiber oblique efficiency test system, a test method and a laser, and belongs to the technical field of laser test. The system comprises a signal light source, a test assembly used for converting input signal light into pumping composite laser transmitted through a to-be-tested optical fiber, a first cladding light stripper and a laser power detector which are sequentially arranged along the output direction of the signal light, the test assembly comprises a first beam combiner connected with a pumping module and a to-be-tested optical fiber, the pumping module comprising at least one first pumping source, and the to-be-tested optical fiber. The specification of the first beam combiner is determined according to the specification of the optical fiber to be tested. According to the specification of the to-be-tested optical fiber, matching of the optical path tail fiber and the to-be-tested optical fiber can be realized on the same test system only by switching the beam combiner to enable the specification of the beam combiner to be consistent with that of the to-be-tested optical fiber, so that full injection of the to-be-tested optical fibers with different specifications is realized; and the oblique efficiency values of the to-be-tested optical fibers with different specifications can be accurately obtained.

Description

Technical Field

[0001] The invention relates to the technical field of laser testing, and in particular to a testing system, a testing method and a laser for the slope efficiency of erbium-ytterbium co-doped optical fiber. Background Art

[0002] Erbium-ytterbium co-doped double-clad fiber (also known as erbium-ytterbium co-doped fiber) is an optical fiber with many advantages such as high output power and working in the safe 1.5μm band. Its slope efficiency is one of the important indicators to measure its performance.

[0003] However, since there are many types of erbium-ytterbium co-doped optical fibers and they are customizable special optical fibers, when testing erbium-ytterbium co-doped optical fibers of different specifications, it is necessary to use multiple corresponding different test platforms for testing. Otherwise, the pump light injection end will not match the specifications of the tested optical fiber, resulting in failure to fully inject the pump light, affecting the accuracy of the slope efficiency test results.

[0004] Therefore, it is necessary to provide a test system that can detect the slope efficiency of Er-Yb co-doped optical fibers of different specifications. Summary of the invention

[0005] The present invention provides a test system, a test method and a laser for the slope efficiency of erbium-ytterbium co-doped optical fibers, which are used to solve the defect in the prior art that different test platforms must be used to test erbium-ytterbium co-doped optical fibers of different specifications, and realize a test system capable of detecting the slope efficiency of erbium-ytterbium co-doped optical fibers of different specifications.

[0006] The present invention provides a testing system for slope efficiency of erbium-ytterbium co-doped optical fiber, comprising: A signal light source, a test assembly, a first cladding light stripper and a laser power detector are sequentially arranged along the signal light output direction; The test assembly includes a first beam combiner, a pump module and an optical fiber to be tested; the pump module includes at least one first pump source; the optical fiber to be tested is an erbium-ytterbium co-doped optical fiber; the test assembly is used to convert the input signal light into a pump composite laser transmitted through the optical fiber to be tested; The first beam combiner is connected to the pump module, and the first beam combiner is connected to the optical fiber to be tested; the first beam combiner is used to couple the pump light output by the pump module and the signal light input to the test component; The specification of the first beam combiner is determined according to the specification of the optical fiber to be tested, so that the first beam combiner is switched to achieve full injection of optical fibers to be tested of different specifications.

[0007] According to a test system for the slope efficiency of an Er-Yb co-doped optical fiber provided by the present invention, the test assembly further comprises an optical fiber coiled cylinder; The cylindrical surface of the optical fiber winding cylinder is engraved with spirally evenly distributed U-shaped grooves; the diameter of each spiral turn of the U-shaped groove is the same; the distance between any two adjacent spiral turns of the U-shaped groove is the same; The optical fiber to be tested is spirally coiled in the U-shaped groove of the optical fiber coiling cylinder.

[0008] According to a test system for slope efficiency of Er-Yb co-doped optical fiber provided by the present invention, the difference between the width of the U-shaped groove and the diameter of the optical fiber to be tested is greater than a first preset threshold.

[0009] According to a test system for slope efficiency of Er-Yb co-doped optical fiber provided by the present invention, the first pump source is a forward pump source; Correspondingly, the test assembly is sequentially arranged as the first beam combiner and the optical fiber to be tested along the signal light output direction; the forward pump source is connected to the first beam combiner; The first beam combiner is used to couple the signal light input to the test component and the forward pump light output by the forward pump source into a pump composite laser that is not transmitted by the optical fiber to be tested.

[0010] According to a test system for slope efficiency of Er-Yb co-doped optical fiber provided by the present invention, the first pump source is a reverse pump source; Correspondingly, the test assembly is sequentially arranged as the optical fiber to be tested and the first beam combiner along the signal light output direction; the reverse pump source is connected to the first beam combiner; The first beam combiner is used to couple the signal light transmitted through the optical fiber to be tested and the reverse pump light output by the reverse pump source into a pump composite laser output by the test component and transmitted through the optical fiber to be tested.

[0011] According to a test system for slope efficiency of Er-Yb co-doped optical fiber provided by the present invention, when there are more than two first pump sources, the actual operating power of the pump module is greater than the maximum rated power of any of the first pump sources.

[0012] According to a test system for the slope efficiency of an erbium-ytterbium co-doped optical fiber provided by the present invention, a pre-amplification stage is arranged between the signal light source and the test component; the pre-amplification stage is used to amplify the power of the signal light input by the signal light source; The pre-amplification stage comprises a signal optical fiber, a second beam combiner, and a second cladding light stripper; the signal optical fiber is connected to the second beam combiner; the second cladding light stripper is connected to the second beam combiner; The second beam combiner is connected to a second pump source for outputting pump light; the second beam combiner is used to couple the signal light input by the signal light source and the pump light output by the second pump source.

[0013] According to a test system for slope efficiency of Er-Yb co-doped optical fiber provided by the present invention, a first isolator is arranged between the first cladding light stripper and the laser power detector; A second isolator is disposed between the second beam combiner and the second cladding light stripper.

[0014] The present invention also provides a method for testing the slope efficiency of erbium-ytterbium co-doped optical fiber, comprising: Determine that the initial signal light power of the signal light source in the slope efficiency test device remains unchanged, and obtain an actual working power data set of the pump module and an output laser power data set recorded by the laser power detector; Fitting a pump light-output laser variation curve based on the actual working power data set and the output laser power data set; The fitting slope of the pump light-output laser variation curve is used as the slope efficiency of the optical fiber to be tested; the optical fiber to be tested is an erbium-ytterbium co-doped optical fiber; The slope efficiency testing device is any one of the above-mentioned erbium-ytterbium co-doped optical fiber slope efficiency testing systems.

[0015] The present invention also provides a laser, comprising: A testing system for the slope efficiency of erbium-ytterbium co-doped optical fiber as described in any one of the above.

[0016] The test system, test method and laser for the slope efficiency of erbium-ytterbium co-doped optical fibers provided by the present invention can achieve matching of optical path pigtails with the optical fibers to be tested on the same test system by simply switching beam combiners according to the specifications of the optical fibers to be tested so that the specifications of the beam combiners are consistent with those of the optical fibers to be tested, so as to achieve full injection of optical fibers to be tested with different specifications, and further accurately obtain the slope efficiency values ​​of the optical fibers to be tested with different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is one of the structural schematic diagrams of the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention.

[0019] Figure 2 It is a front view of the optical fiber winding cylinder provided by the present invention.

[0020] Figure 3 This is the second structural schematic diagram of the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention.

[0021] Figure 4 This is the third structural schematic diagram of the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention.

[0022] Figure 5 It is a flow chart of a method for testing the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention.

[0023] Figure 6 It is a schematic diagram of the structure of the laser provided by the present invention.

[0024] Reference numerals: 1: signal light source; 2: test assembly; 3: first cladding light stripper; 4: laser power detector; 5: pre-amplifier stage; 6: first isolator; 7: second isolator; 21: first beam combiner; 22: pump module; 23: optical fiber to be tested; 221: first pump source; 2211: forward pump source; 2212: reverse pump source; 51: signal optical fiber; 52: second beam combiner; 53: second cladding light stripper; 54: second pump source. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that, in the description of the present invention, the term "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] The terms "first", "second", etc. in the present invention are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present invention can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0028] Combine the following Figure 1-Figure 6 The invention describes a testing system, a testing method and a laser for the slope efficiency of an erbium-ytterbium co-doped optical fiber.

[0029] In recent years, ytterbium-doped fiber lasers have shown excellent performance in the industrial field, but they work in the 1.06μm band, which is dangerous to use in fields that require human participation, such as laser ranging, laser radar, remote sensing, and space communications. In comparison, the human eye damage threshold of 1.5μm lasers is more than 4 orders of magnitude higher than that of 1.06μm lasers, and they are "eye-safe", which is of great significance in fields that require human participation. Therefore, people have begun to pay attention to and develop high-power 1.5μm fiber amplifiers, the core component of which is erbium-doped gain fiber.

[0030] The gain fiber doped with erbium alone cannot meet the high-power operation requirements due to the concentration quenching effect. Therefore, erbium-ytterbium co-doped double-clad fiber (also called erbium-ytterbium co-doped fiber) came into being. Because the ytterbium ion concentration of this double-clad gain fiber is greater than the erbium ion concentration, one erbium ion is surrounded by multiple ytterbium ions, which avoids the clustering of erbium ions and increases the doping concentration of erbium ions. In the erbium-ytterbium co-doped double-clad fiber, the ytterbium ions first absorb the pump light, and then excite the erbium ions through sensitization to form a population inversion, thereby making full use of the advantages of the ytterbium ion absorption band being very wide, the pump absorption coefficient being large, and allowing high-power multi-mode pumping.

[0031] Compared with erbium-doped fiber amplifiers, the main advantages of erbium-ytterbium co-doped double-clad fiber amplifiers are reflected in the following aspects: (1) operation in the 1.5μm band; (2) high output power; (3) high energy conversion efficiency; (4) high peak power and high repetition rate pulse output; (5) through optimization, a beam quality close to the diffraction limit can be achieved.

[0032] One of the most important indicators in the use of Er-Yb co-doped double-clad optical fiber is the efficiency of converting pump light into 1.5μm band laser, that is, slope efficiency. The slope efficiency has a great impact on the end user, on the one hand, it is the matching selection of the pump source, and on the other hand, it plays a decisive role in the output laser power.

[0033] However, there are several difficulties in establishing the slope efficiency test system of erbium-ytterbium co-doped double-clad optical fiber: (1) There are many types of erbium-ytterbium co-doped optical fibers, and they are customizable special optical fibers. If the pump light injection end does not match the specifications of the tested optical fiber, the pump light cannot be fully injected, affecting the accuracy of the test results. It is necessary to use multiple corresponding test platforms to match the specifications of the tested optical fiber; (2) The use scenarios of erbium-ytterbium co-doped optical fiber include forward pumping and reverse pumping. If it is necessary to evaluate the use effect under different pumping scenarios, it is also necessary to use multiple corresponding test platforms. However, it is not advisable to establish multiple test platforms in terms of time, space and economic benefits. Therefore, it is considered that the same platform is compatible with the testing needs of multiple types of erbium-ytterbium co-doped optical fibers; (3) Erbium-ytterbium co-doped optical fibers are mostly coiled when used. Stacking multiple coils of optical fiber will cause serious heating of the optical fiber, which makes the output power of erbium-ytterbium co-doped fiber lasers have great limitations.

[0034] In view of this, the present invention provides a test system, a test method and a laser for the slope efficiency of erbium-ytterbium co-doped optical fiber to solve at least one of the problems existing in the test of the slope efficiency of erbium-ytterbium co-doped optical fiber.

[0035] Figure 1 FIG. 1 is one of the structural schematic diagrams of the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention, such as Figure 1 As shown, the test system for the slope efficiency of Er-Yb co-doped optical fiber includes but is not limited to a signal light source 1, a test assembly 2, a first cladding light stripper 3 (CPS) and a laser power detector 4 which are sequentially arranged along the signal light output direction. The signal light output direction is Figure 1 The direction the arrow points to.

[0036] The test assembly 2 includes but is not limited to a first beam combiner 21, a pump module 22 and a fiber to be tested 23; the pump module 22 includes at least one first pump source 221 (MP). The fiber to be tested 23 is an erbium-ytterbium co-doped fiber. The first beam combiner 21 is connected to the pump module 22, and the first beam combiner 21 is connected to the fiber to be tested 23; the first beam combiner 21 is used to couple the pump light output by the pump module 22 and the signal light input to the test assembly 2. The pump light output by the pump module 22 is the sum of the pump light output by at least one first pump source 221.

[0037] The specifications of the first beam combiner 21 are determined according to the specifications of the optical fiber 23 to be tested.

[0038] The signal light source 1 is used to input signal light; the test component 2 is used to convert the signal light input to the test component 2 into a pump composite laser transmitted through the optical fiber 23 to be tested; the first cladding light stripper 3 is used to strip the residual pump light in the pump composite laser output by the test component 2; the laser power detector 4 is used to detect and record the output laser power data passing through the test component 2 and the first cladding light stripper 3.

[0039] Optionally, the first combiner 21 is a (N+1)*1 type signal / pump coupler.

[0040] Optionally, the signal fiber of the first combiner 21 is a passive fiber that matches the optical fiber 23 to be tested.

[0041] Optionally, the laser power detector 4 is an optical power meter.

[0042] The erbium-ytterbium co-doped optical fiber slope efficiency test system provided by the present invention can achieve matching of optical path tail fibers with the optical fiber to be tested on the same test system by only switching a beam combiner according to the specifications of the optical fiber to be tested so that the specifications of the beam combiner are consistent with those of the optical fiber to be tested, so as to achieve full injection of optical fibers to be tested with different specifications, and then accurately obtain the slope efficiency values ​​of the optical fibers to be tested with different specifications.

[0043] Figure 2 : is a front view of the optical fiber coiled cylinder provided by the present invention, such as Figure 2 As shown, the test assembly also includes a fiber-winding cylinder; the cylindrical surface of the fiber-winding cylinder is engraved with spirally evenly distributed U-shaped grooves; the diameter of each spiral turn of the U-shaped groove is the same; the distance between any two adjacent spiral turns of the U-shaped groove is the same; the optical fiber to be tested is spirally wound in the U-shaped groove of the fiber-winding cylinder.

[0044] By engraving a U-shaped groove on the surface of the fiber winding cylinder, the fiber to be tested can be well matched with the U-shaped groove when winding, which facilitates embedding of the fiber to be tested and avoids damage to the fiber to be tested due to uneven force.

[0045] Moreover, the U-shaped grooves are evenly distributed on the fiber winding cylinder in a spiral shape, the diameter of each spiral turn is the same, and the distance between any two adjacent spiral turns is the same, which can avoid the micro-bending effect and uneven heat dissipation caused by the conventional stacking of erbium and ytterbium co-doped optical fibers.

[0046] Optionally, the diameter of each spiral turn of the U-shaped groove is determined based on the optimal bending diameter of the erbium-ytterbium co-doped optical fiber. When the erbium-ytterbium co-doped optical fiber to be tested is wound around the optical fiber winding cylinder, the bending diameter can be in an optimal state.

[0047] Optionally, the fiber-winding cylinder is made of metal material. Since metal has better thermal conductivity than air, placing the optical fiber to be tested on the surface of the fiber-winding cylinder made of metal material is helpful for heat dissipation during use.

[0048] Furthermore, the metal fiber coiled cylinder determined based on the optimal bending diameter of the erbium-ytterbium co-doped optical fiber not only makes the bending diameter of the erbium-ytterbium co-doped optical fiber in an optimal state, but also, with the help of the good thermal conductivity and heat dissipation performance of the metal material, can cope with the heating phenomenon that occurs when the erbium-ytterbium co-doped optical fiber is subjected to high optical power.

[0049] Optionally, the number of spiral turns of the U-shaped groove in the optical fiber winding cylinder can be determined according to the efficiency of the output laser. The higher the efficiency of the output laser, the greater the number of spiral turns.

[0050] Based on the above embodiment, as an optional embodiment, the difference between the width of the U-shaped groove and the diameter of the optical fiber to be tested is greater than a first preset threshold and less than a second preset threshold.

[0051] Optionally, a difference between the depth of the U-shaped groove and the diameter of the optical fiber to be tested is greater than or equal to a first preset threshold.

[0052] For example, the first preset threshold is 1 μm, 2 μm, and so on.

[0053] For another example, the second preset threshold is 10 μm, 20 μm, and so on.

[0054] Firstly, when the optical fiber is wound around the U-shaped groove of the cylinder, the design has a certain redundancy, which can meet the testing requirements of erbium-ytterbium co-doped optical fibers to be tested with different specifications within a certain range.

[0055] Secondly, during the batch testing of the slope efficiency of erbium-ytterbium co-doped optical fibers of different specifications, especially during the batch testing of erbium-ytterbium co-doped optical fibers in order of specifications from large to small or from small to large, if the difference between the width of the U-shaped groove and the diameter of the optical fiber to be tested is less than the first preset threshold or greater than the second preset threshold, the optical fiber winding cylinder whose width of the U-shaped groove is more closely matched with the diameter of the optical fiber to be tested within the next specification range is replaced, so as to minimize the number of times the optical fiber winding cylinder is replaced while ensuring the test effect.

[0056] Furthermore, with the help of the metal fiber winding cylinder, the fixed diameter winding of the optical fiber to be tested can be achieved, solving the output power limitation problem caused by heat generation during the optical-to-optical conversion process of the erbium-ytterbium co-doped optical fiber.

[0057] Based on the above embodiment, as an optional embodiment, when there are more than two first pump sources, the actual working power of the pump module is greater than the maximum rated power of any first pump source.

[0058] For example, the pump module may include two first pump sources, wherein the maximum rated power of one first pump source is 5W, and the maximum rated power of the other first pump source is 10W. Then, the actual working power of the pump module may exceed 10W and reach 15W.

[0059] Optionally, the maximum rated power of any first pump source can be set according to actual test requirements, and specifically can be 5 W, 10 W, 15 W, 20 W, 25 W, etc.

[0060] By providing more than two first pump sources, the actual working power of the pump module can exceed the maximum rated power of a single first pump source, so as to provide a higher pump light power.

[0061] The test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention can break through the maximum rated power of a single first pump source to increase the pump light power. At the same time, combined with the heat dissipation function that can be achieved by the optical fiber coiled cylinder, a test system with higher power and guaranteed slope efficiency test accuracy can be achieved.

[0062] Figure 3 FIG. 2 is a second structural diagram of a test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention. Figure 3 As shown, as an optional embodiment, the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber also includes a pre-amplification stage 5 arranged between the signal light source 1 and the test component 2; the pre-amplification stage 5 is used to amplify the power of the signal light input by the signal light source 1.

[0063] Among them, the pre-amplifier stage 5 includes a signal optical fiber 51, a second combiner 52 and a second cladding light stripper 53 arranged in sequence along the signal light output direction; the signal optical fiber 51 is connected to the second combiner 52; the second cladding light stripper 53 is connected to the second combiner 52; the second combiner 52 is connected to a second pump source 54 for outputting pump light; the second combiner is used to couple the signal light input by the signal light source 1 and the pump light output by the second pump source 54.

[0064] Optionally, the second pump source 54 is a pump source for outputting reverse pumping light.

[0065] Optionally, the signal optical fiber 51 is an erbium-ytterbium co-doped optical fiber having the same specifications as the optical fiber 23 to be tested.

[0066] The test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention increases the 1.5μm laser power output by the erbium-ytterbium co-doped optical fiber to more than 20W through two-stage amplification including a pre-amplification stage. On this basis, a multi-stage amplification optical path can be further developed to achieve higher power output.

[0067] Combination Figure 3As shown, based on the above embodiment, as an optional embodiment, the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber also includes: a first isolator 6 arranged between the first cladding light stripper 3 and the laser power detector 4, and the first isolator 6 is respectively connected to the first cladding light stripper 3 and the laser power detector 4; a second isolator 7 is arranged between the second combiner 52 and the second cladding light stripper 53, and the second isolator 7 is respectively connected to the second combiner 52 and the second cladding light stripper 53.

[0068] An isolator, also known as an optical isolator, is a passive device that allows light to pass in one direction but prevents light from passing in the opposite direction. Its function is to limit the direction of light so that light can only be transmitted in one direction. The light reflected by the optical fiber echo can be well isolated by the optical isolator, thereby improving the efficiency of light wave transmission.

[0069] Combination Figure 3 As shown, based on the above embodiment, as an optional embodiment, the first pump source is a forward pump source 2211 .

[0070] Correspondingly, the test component 2 is sequentially provided with a first beam combiner 21 and a fiber to be tested 23 along the signal light output direction; the forward pump source 2211 is connected to the first beam combiner 21; the first beam combiner 21 is used to couple the signal light input to the test component 2 and the forward pump light output by the forward pump source 2211 into a pump composite laser that has not been transmitted by the fiber to be tested 23. After the pump composite laser passes through the fiber to be tested 23, part of the pump light is converted into signal light, and the test component 2 outputs the pump composite laser that has been transmitted by the fiber to be tested 23.

[0071] It is understandable that the forward pump source 2211 is a first pump source that outputs pump light as forward pump light based on a specific connection mode with the first combiner 21 and the optical fiber to be tested 23, and is not a specific device that outputs forward pump light alone.

[0072] Combination Figure 3 As shown, taking the erbium-ytterbium co-doped optical fiber with a specification of 10 / 125 as the optical fiber to be tested 23 as an example, at this time, the use scenario of the test system for the slope efficiency of the erbium-ytterbium co-doped optical fiber provided by the present invention is forward pumping.

[0073] Since the specification of the optical fiber 23 to be tested is 10 / 125, the first beam combiner 21 with a signal optical fiber of 10 / 125 is selected. Figure 3The structural schematic diagram shown connects the various components of the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber, and winds the optical fiber 23 to be tested in the U-shaped groove of the optical fiber winding cylinder. After the connection is completed, turn on the signal light source 1 and set the specified signal light power. Turn on the second pump source 54 in the pre-amplifier stage 5 and set the specified pre-amplifier pump light power. After the signal light passes through the second combiner 52 to reversely pump the signal optical fiber 51 of the pre-amplifier stage 5, it is injected into the second isolator 7, and after passing through the second cladding light stripper 53, it is connected to the signal fiber of the first combiner 21 as the pre-amplified signal light. Turn on the two forward pump sources 2211, and set the sum of the pump powers of the two forward pump sources 2211 in an incremental manner, such as 5W, 10W, 15W, 20W, 25W, etc.

[0074] After the pre-amplified signal light passes through the first combiner 21 to forward pump the tested 10 / 125 optical fiber 23, the output pump composite laser passes through the first cladding light stripper 3 to strip the unconverted residual pump light in the pump composite laser, and then is injected into the first isolator 6. Finally, the laser power detector 4 detects and records the output laser power data under different forward pump powers (i.e., actual working power) of the pump module.

[0075] Figure 4 FIG. 3 is a structural schematic diagram of a test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention. Figure 4 As shown, as an optional embodiment, the first pump source is a reverse pump source 2212; Correspondingly, the test component 2 is sequentially arranged along the signal light output direction to be the optical fiber 23 to be tested and the first combiner 21; the reverse pump source 2212 is connected to the first combiner 21; the first combiner 21 is used to couple the signal light transmitted through the optical fiber 23 to be tested and the reverse pump light output by the reverse pump source 2212 into a pump composite laser output by the test component 2 and transmitted through the optical fiber 23 to be tested.

[0076] It is understandable that the reverse pump source 2212 is a first pump source that outputs pump light as reverse pump light based on a specific connection mode with the first combiner 21 and the optical fiber to be tested 23, and is not a specific device that outputs reverse pump light alone.

[0077] Combination Figure 4 As shown, taking the erbium-ytterbium co-doped optical fiber with a specification of 12 / 130 as the optical fiber to be tested 23 as an example, at this time, the use scenario of the test system for the slope efficiency of the erbium-ytterbium co-doped optical fiber provided by the present invention is reverse pumping.

[0078] Since the specification of the optical fiber 23 to be tested is 12 / 130, the first beam combiner 21 with a signal optical fiber of 12 / 130 is selected. Figure 4The structural schematic diagram shown connects the various components of the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber, and winds the optical fiber 23 to be tested in the U-shaped groove of the optical fiber winding cylinder. After the connection is completed, turn on the signal light source 1 and set the specified signal light power. Turn on the second pump source 54 in the pre-amplifier stage 5 and set the specified pre-amplifier pump light power. After the signal light passes through the second combiner 52 to reversely pump the signal optical fiber 51 of the pre-amplifier stage 5, it is injected into the second isolator 7, and after passing through the second cladding light stripper 53, it is connected to the 10 / 125 optical fiber 23 to be tested as pre-amplified signal light. Turn on the two reverse pump sources 2212, and set the sum of the pump powers of the two reverse pump sources 2212 in an incremental manner, such as 5W, 10W, 15W, 20W, 25W, etc.

[0079] After the 12 / 130 optical fiber to be tested 23 is reversely pumped by the first combiner 21, the output pump composite laser passes through the first cladding light stripper 3 to strip the residual pump light that has not been converted in the pump composite laser, and is then injected into the first isolator 6. Finally, the laser power detector 4 detects and records the output laser power data under different reverse pump powers (i.e., actual working powers) of the pump module.

[0080] The test system for the slope efficiency of erbium-ytterbium co-doped optical fibers provided by the present invention can test the optical fibers to be tested by simulating lasers of forward pumping optical paths and reverse pumping optical paths on the same test platform by flexibly adjusting and switching the connection mode of the first beam combiner in the test component and the optical fibers to be tested according to test requirements; and can test the optical fibers to be tested of different specifications on the same test platform by switching first beam combiners of different specifications in the test component; thereby, the slope efficiencies of erbium-ytterbium co-doped optical fibers of different specifications under different pumping scenarios can be accurately measured, the operation is simple, and the time for optical fiber manufacturers to test the slope efficiencies of erbium-ytterbium co-doped optical fibers of different specifications under different pumping scenarios can be shortened, and the test cost of the optical fiber manufacturers to provide the slope efficiency data of erbium-ytterbium co-doped optical fibers of different specifications under different pumping scenarios to optical fiber purchasing users is reduced, thereby having high economic benefits.

[0081] Figure 5 FIG. 1 is a flow chart of a method for testing the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention, such as Figure 5 As shown, the test method of the slope efficiency of the erbium-ytterbium co-doped optical fiber includes but is not limited to the following steps S1 to S3.

[0082] Step S1: Determine that the initial signal light power of the signal light source in the slope efficiency test device remains unchanged, and obtain an actual working power data set of the pump module and an output laser power data set recorded by the laser power detector.

[0083] Step S2: fitting a pump light-output laser variation curve based on the actual working power data set and the output laser power data set.

[0084] Step S3: taking the fitting slope of the pump light-output laser variation curve as the slope efficiency of the optical fiber to be tested; the optical fiber to be tested is an erbium-ytterbium co-doped optical fiber.

[0085] The slope efficiency testing device is the erbium-ytterbium co-doped optical fiber slope efficiency testing system provided by any of the above embodiments.

[0086] It should be noted that the executor of the test method for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by the present invention can be a server, a computer device, such as a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc.

[0087] Specifically, by using the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided by any of the above embodiments, it is determined that the initial signal light power of the signal light source in the slope efficiency test device remains unchanged, and when the actual working power of the pump module can be adjusted according to the number of the first pump source and the maximum rated power, an actual working power data set composed of different actual working power data of the pump module is obtained, and the output laser power data of the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber detected and recorded by the laser power detector is obtained to construct an output laser power data set. It can be understood that the output laser power will be different according to the actual working power of the pump module, and the actual working power data in the actual working power data set corresponds one-to-one to the output laser power data in the output laser power data set.

[0088] The recorded actual working power data set and output laser power data set are input into a computer, and a pre-written computer program is used to fit and calculate the change curves of the pump light and the output laser to obtain the pump light-output laser change curve.

[0089] Finally, the fitting slope of the pump light-output laser variation curve is used as the slope efficiency of the Er-Yb co-doped optical fiber to be tested.

[0090] The method for testing the slope efficiency of erbium-ytterbium co-doped optical fibers provided by the present invention can achieve matching of optical path tail fibers with the optical fibers to be tested on the same testing system by only switching a beam combiner according to the specifications of the optical fibers to be tested so that the specifications of the beam combiner are consistent with those of the optical fibers to be tested, so that full injection of optical fibers to be tested with different specifications can be achieved, thereby accurately obtaining the slope efficiency values ​​of the optical fibers to be tested with different specifications.

[0091] Figure 6 Schematic diagram of the structure of the laser provided by the present invention, such as Figure 6 As shown, the laser 600 includes but is not limited to the test system for the slope efficiency of erbium-ytterbium co-doped optical fiber provided in any embodiment.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A test system for slope efficiency of Er / Yb co-doped optical fiber, characterized in that: include: A signal light source, a test assembly, a first cladding light stripper and a laser power detector are sequentially arranged along the signal light output direction; The test assembly includes a first beam combiner, a pump module and an optical fiber to be tested; the pump module includes at least one first pump source; the optical fiber to be tested is an erbium-ytterbium co-doped optical fiber; the test assembly is used to convert the input signal light into a pump composite laser transmitted through the optical fiber to be tested; The first beam combiner is connected to the pump module, and the first beam combiner is connected to the optical fiber to be tested; the first beam combiner is used to couple the pump light output by the pump module and the signal light input to the test component; The specification of the first beam combiner is determined according to the specification of the optical fiber to be tested, so that the first beam combiner is switched to achieve full injection of optical fibers to be tested of different specifications.

2. The test system for slope efficiency of Er-Yb co-doped optical fiber according to claim 1, characterized in that: The test assembly also includes a fiber-wound cylinder; The cylindrical surface of the optical fiber winding cylinder is engraved with spirally evenly distributed U-shaped grooves; the diameter of each spiral turn of the U-shaped groove is the same; the distance between any two adjacent spiral turns of the U-shaped groove is the same; The optical fiber to be tested is spirally coiled in the U-shaped groove of the optical fiber coiling cylinder.

3. The test system for the slope efficiency of Er-Yb co-doped optical fiber according to claim 2, characterized in that: The difference between the width of the U-shaped groove and the diameter of the optical fiber to be tested is greater than a first preset threshold.

4. The test system for the slope efficiency of Er-Yb co-doped optical fiber according to claim 1, characterized in that: The first pump source is a forward pump source; Correspondingly, the test assembly is sequentially arranged as the first beam combiner and the optical fiber to be tested along the signal light output direction; the forward pump source is connected to the first beam combiner; The first beam combiner is used to couple the signal light input to the test component and the forward pump light output by the forward pump source into a pump composite laser that is not transmitted by the optical fiber to be tested.

5. The test system for the slope efficiency of Er-Yb co-doped optical fiber according to claim 1, characterized in that: The first pump source is a reverse pump source; Correspondingly, the test assembly is sequentially arranged as the optical fiber to be tested and the first beam combiner along the signal light output direction; the reverse pump source is connected to the first beam combiner; The first beam combiner is used to couple the signal light transmitted through the optical fiber to be tested and the reverse pump light output by the reverse pump source into a pump composite laser output by the test component and transmitted through the optical fiber to be tested.

6. The test system for the slope efficiency of Er-Yb co-doped optical fiber according to claim 1, characterized in that: When there are more than two first pump sources, the actual operating power of the pump module is greater than the maximum rated power of any of the first pump sources.

7. The test system for slope efficiency of Er-Yb co-doped optical fiber according to claim 1, characterized in that: Also includes: A pre-amplification stage disposed between the signal light source and the test assembly; The pre-amplification stage is used to amplify the power of the signal light input by the signal light source; The pre-amplification stage includes a signal optical fiber, a second beam combiner, and a second cladding light stripper; The signal optical fiber is connected to the second beam combiner; the second cladding light stripper is connected to the second beam combiner; The second beam combiner is connected to a second pump source for outputting pump light; the second beam combiner is used to couple the signal light input by the signal light source and the pump light output by the second pump source.

8. The test system for the slope efficiency of Er-Yb co-doped optical fiber according to claim 7, characterized in that: Also includes: a first isolator disposed between the first cladding light stripper and the laser power detector; A second isolator is disposed between the second beam combiner and the second cladding light stripper.

9. A method for testing the slope efficiency of erbium-ytterbium co-doped optical fiber, characterized in that: include: Determine that the initial signal light power of the signal light source in the slope efficiency test device remains unchanged, and obtain an actual working power data set of the pump module and an output laser power data set recorded by the laser power detector; Fitting a pump light-output laser variation curve based on the actual working power data set and the output laser power data set; The fitting slope of the pump light-output laser variation curve is used as the slope efficiency of the optical fiber to be tested; the optical fiber to be tested is an erbium-ytterbium co-doped optical fiber; The slope efficiency testing device is the erbium-ytterbium co-doped optical fiber slope efficiency testing system as described in any one of claims 1 to 8.

10. A laser, characterized in that: include: A test system for the slope efficiency of erbium-ytterbium co-doped optical fibers as claimed in any one of claims 1 to 8.

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