CN117168764A - Blocking type multi-optical-fiber insertion loss testing system - Google Patents

Abstract

The application discloses a blocking type multi-optical fiber insertion loss testing system which comprises a multi-path light source output end, a light blocking device and a light detector, wherein the light blocking device is a multi-path in and multi-path out optical fiber device which is arranged between the multi-path light source output end and the light detector, and only allows any one path to pass through and blocks other light paths. The application reduces the whole size by arranging the light blocking device and arranging the optical fiber collimator assembly on the collimator alignment base, can be manufactured into a portable instrument, avoids the mechanical movement of the optical link and the optical fiber collimator assembly, ensures the consistency of the position degree when the optical path is switched, is not easily affected by vibration, has low requirement on the use environment, high switching speed, simple structure and low manufacturing cost.

Description

Blocking type multi-optical-fiber insertion loss testing system

Technical Field

The application relates to the technical field of optical communication, in particular to a blocking type multi-optical-fiber insertion loss testing system.

Background

With the development and application of optical technology, the multichannel optical communication device is applied in a large amount, so that it is important to measure the optical fiber insertion loss of the multichannel optical communication device in order to ensure the normal operation of the multichannel optical communication device, and then a multichannel optical fiber insertion loss test system is provided.

In the multichannel optical fiber insertion loss test system, the wavelength and channel switching is realized by switching an optical switch, and the switching of the optical switch is realized by reconstructing an optical path. The conventional mechanical optical switch is a main practical optical switch, and can guide light from an input optical fiber to a designated output optical fiber, and switching is often realized by changing the position of an input end. During its switching operation, the following disadvantages often exist:

1. the optical path and the collimator component have mechanical movement, the consistency of the optical path is difficult to ensure when the optical path is switched every time, deviation is easy to occur, the repeatability of the optical path is poor, and the measurement error is large;

2. when the optical path is switched, the optical fiber is easy to shake and pull torsion, the switching speed is relatively slow, and the time required for testing 12 channels is more than 10 seconds in order to meet the alignment of the optical path;

3. when the input collimator switches to move, the optical fiber is easy to pull or twist, so that the tiny change of the optical fiber signal, especially the change of the polarization state, is caused, and the test value is changed;

4. in order to ensure the stability of the light path, the requirements on the use environment are high, and the light path is easy to be influenced by vibration;

5. the size is large, the impact can not be received, and a portable instrument can not be manufactured;

6. in order to ensure the precision during switching, the requirements of the alignment device fixing assembly and the circuit control system are higher, the requirements of the processing precision are higher, and the manufacturing cost is higher.

Disclosure of Invention

In view of the above, the present application aims at overcoming the drawbacks of the prior art, and its main objective is to provide a blocking type multi-fiber insertion loss testing system, which solves the technical problems of relatively large error in measured value, relatively low switching speed, relatively high requirements on use environment, relatively large size, incapability of manufacturing portable instruments, relatively high manufacturing precision requirement, and relatively high cost caused by that the optical link and the collimator component have mechanical movement during optical path switching, and the optical path position degree of switching is relatively difficult to ensure and the optical fiber is easy to pull and twist.

In order to achieve the above purpose, the present application adopts the following technical scheme:

the application relates to a blocking type multi-optical fiber insertion loss testing system which comprises a multi-path light source output end, a light blocking device and a light detector, wherein the light blocking device is a multi-path in and multi-path out optical fiber device which is arranged between the multi-path light source output end and the light detector, and the light blocking device only allows any path to pass through and blocks other light paths.

As a preferred scheme, the light blocking device includes, but is not limited to, a PLC blocking chip.

As a preferable scheme, the light blocking device comprises a multi-path optical fiber collimator assembly, a light blocking component, a driving device and a collimator alignment base;

the optical fiber collimator assemblies are arranged on the collimator alignment base and each optical fiber collimator assembly comprises an input optical fiber collimator and a corresponding output optical fiber collimator which are precisely aligned;

the light blocking component is movably arranged between the input optical fiber collimator and the output optical fiber collimator, and is provided with a light passing hole which only allows one optical fiber collimator assembly to pass light and blocks other optical fiber collimator assemblies;

the driving end of the driving device is connected with the light blocking component, and the driving device enables the light passing holes of the light blocking component to sequentially move along the arrangement route of the optical fiber collimator assembly.

As a preferred solution, the driving means include, but are not limited to, a stepper motor, a servo motor.

As a preferred solution, the optical fiber collimator assembly is arranged in a circular or linear way.

As a preferable scheme, the arrangement route of the optical fiber collimator assembly is round, the light blocking device is round, and the driving device drives the light blocking component to rotate along the circle center.

As a preferable scheme, the light blocking component is made of soft light absorption materials and is annular, and only one light through hole corresponding to the optical fiber collimator assembly is formed in the light blocking component.

As a preferable scheme, the light blocking component can be in a bar shape, a plurality of light through holes are formed in the light blocking component, and the light through holes are distributed in a spiral mode along the length direction of the light blocking component.

As a preferred scheme, the PLC separation chip comprises a chip main body, multiple paths of input ports and output ports, the multiple paths of input ports and the output ports are respectively arranged on two sides of the chip main body in a one-to-one correspondence mode, the chip main body comprises a shell and an integrated part arranged in the shell, the integrated part comprises an electrode layer, a liquid crystal layer, a reflection grating, a waveguide layer and a substrate, the waveguide layer is arranged on the substrate, the reflection grating is arranged between the waveguide layer and the liquid crystal layer, the electrode layer is arranged at one end, far away from the reflection grating, of the liquid crystal layer, the refractive index of the liquid crystal layer is changed through adjusting the voltage of the electrode layer to separate the waveguide layer, only any path of input ports and output ports are allowed to pass light, and all other paths are not allowed to pass light.

As a preferable scheme, the multi-path light source output end is formed by sequentially connecting a plurality of wavelength light sources, a plurality of blocking optical switch pieces, an optical fiber wavelength combiner and a splitter, and any one of the wavelength light sources is divided into multi-path light sources and is output from the multi-path light source output end.

Compared with the prior art, the application has obvious advantages and beneficial effects, in particular, the technical proposal can be adopted to realize that the application mainly comprises the following steps:

1. the light path switching speed is high, so that the test time is less than 1 second.

2. By arranging the light blocking device for selectively shielding the multipath light sources and installing the optical fiber collimator assembly on the collimator alignment base, the optical link and the optical fiber collimator assembly have no mechanical movement, and the optical path is not changed completely during working, so that the problems of unstable optical path and poor repeatability are solved;

3. the optical fiber collimator assembly and the collimator are fixedly arranged on the alignment base, so that the optical fiber collimator assembly and the collimator have small overall structure size, high integration level and low requirements on the use environment and can be used as portable equipment;

4. the driving device and the light blocking component are matched, so that after the channel is switched, the power is not needed to maintain the light path, the heat is not generated, the light path is more stable, and the energy is saved and the environment is protected;

5. the installation position degrees of the input collimator, the output collimator and the light-passing holes are determined, so that the accurate switching of the light paths can be met, high processing precision is not needed, a complex circuit control system is not needed, the test speed is high, and the manufacturing cost is low;

6. the error of the whole test system is greatly reduced and tends to zero, so that the test system can be used as calibration equipment of other equipment;

7. when the optical link is switched, the optical link is not easily affected by jitter.

In order to more clearly illustrate the structural features and efficacy of the present application, the present application will be described in detail below with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic diagram of the optical path of a conventional multi-fiber insertion loss test system according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a typical conventional design of a conventional multi-channel optical switch according to an embodiment of the present application;

FIG. 3 is a functional block diagram of a blocking multi-fiber insertion loss tester according to embodiments 1-5 of the present application;

FIG. 4 is a functional block diagram of a blocking type multi-fiber insertion loss tester with an optical splitter according to embodiments 1-5 of the present application;

FIG. 5 is a schematic view and a schematic view of an optical path of a single-channel light blocking device according to embodiment 1 of the present application;

FIG. 6 is a physical diagram of a 12-way single-channel mechanical optical switch array according to embodiment 1 of the present application;

fig. 7 is a schematic diagram of an assembled structure of a light blocking device of embodiment 2 of the present application;

fig. 8 is a schematic exploded view of the structure of the light blocking device of embodiment 2 of the present application;

fig. 9 is a schematic diagram of an assembled structure of a light blocking device of embodiment 3 of the present application;

fig. 10 is a schematic diagram of an assembled structure of a light blocking device of embodiment 4 of the present application;

fig. 11 is a schematic exploded view of the structure of the light blocking device of embodiment 4 of the present application;

fig. 12 is a schematic diagram of a product of a light blocking device of embodiment 4 of the present application;

FIG. 13 is a schematic view of a test apparatus according to embodiment 4 of the present application;

FIG. 14 is a schematic diagram of test data of a test apparatus according to embodiment 4 of the present application;

fig. 15 is a schematic structural view of a PLC chip-based light blocking device of embodiment 5 of the present application;

fig. 16 is a cross-sectional view of a PLC blocking chip based light blocking device of embodiment 5 of the present application.

Reference numerals illustrate:

10. a light blocking member; 11. a light-transmitting hole;

20. the collimator is aligned with the base; 21. a first mounting plate; 22. a second mounting plate; 221. a cross plate; 222. a riser; 223. a second avoidance through hole;

30. a driving device; 31. a transmission arm;

40. a mounting block; 41. mounting through holes; 42. the first avoidance through hole; 43. the accommodating groove;

50. an optical fiber collimator assembly; 51. an input fiber collimator; 52. an output fiber collimator;

60. an input port; 61. an output port; 62. a chip main body; 621. a housing; 622. an integrated component; 6221. an electrode layer; 6222. a liquid crystal layer; 6223. a reflection grating; 6224. a waveguide layer; 6225. a substrate;

70. the output ends of the multipath light sources; 71. a wavelength light source; 72. an optical fiber wavelength combiner; 73. a splitter; 74. a conventional 1×4 optical switch; 75. a traditional multi-path optical switch; 76. a blocking type optical switching member;

80. a light blocking device; 81. an MPO connector;

90. a light detector.

Detailed Description

For the purpose of making the technical solution and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings and examples of implementation. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

First, an application scenario to which the present application is applicable will be described.

The application can be applied to the technical field of optical communication, and along with the development and application of optical technology, the structure of the multichannel optical communication device tends to be complicated, and in order to ensure the normal operation of the multichannel optical communication device, the measurement of the optical fiber insertion loss of the multichannel optical communication device is particularly important, so that the generation of a multichannel optical fiber insertion loss test system is realized.

Referring to fig. 1, fig. 1 is a schematic optical path diagram of a conventional multi-fiber insertion loss testing system.

The optical fiber testing device consists of a wavelength light source 71, a traditional 1×4 optical switch 74, a 50:50 optical splitter 73, a traditional multi-path optical switch 75, a multi-path optical fiber testing bus (with an MPO connector 81), a multi-path optical fiber tested line (with the MPO connector 81) and a large-area optical detector 90; when the test system works, the wavelength and channel switching are realized through the switching of an optical switch, and the optical switch switching is realized through reconstructing an optical path. The test system can measure both the insertion loss and return loss of an optical connector.

The optical switch is used for ensuring that only one optical fiber passes light at any time, is used for time-sharing detection, and requires that the response efficiency of all channels is the same. The optical power meter is a large area detector or an integrating sphere detector that can receive all channels. In the test system of fig. 1, the test of each channel is accomplished by switching the optical switch.

Referring again to fig. 2, fig. 2 is a schematic structural diagram of a typical conventional design of a conventional multi-channel optical switch, in which an input fiber collimator 51 is rotated by a driving device 30 and a transmission arm 31, aligned with an opposite output fiber collimator 52, and the optical path is switched to a corresponding optical fiber.

The following problems occur in the process of switching operation of the multichannel optical switch:

1. the optical path and the collimator component have mechanical movement, the consistency of the position degree is difficult to ensure when the optical path is switched every time, deviation is easy to occur, the repeatability of the optical path is poor, and the measurement error is large;

2. the light path can not ensure the complete consistency of the alignment position during each switching, so that the light path has poor repeatability and large measurement error;

3. when the input collimator switches, the switching speed cannot be too high due to the fact that the input optical fiber is pulled, otherwise, the test data are affected;

4. in order to ensure the stability of the light path, the requirements on the use environment are high, and the light path cannot be influenced by vibration;

5. the size is large, and a portable instrument cannot be manufactured;

6. in order to ensure the precision during switching, the requirements of the alignment device fixing assembly and the circuit control system are high, and the processing precision is high, so that the manufacturing cost is high.

Among the above problems, slow test speed is a prominent problem. In the conventional multi-channel insertion loss test system, the test time is generally from 10 seconds to several tens of seconds when testing one 12-channel MPO connector 81.

Based on this, embodiments 1-5 of the present application provide a blocking type multi-fiber insertion loss test system based on the "blocking" working principle, instead of the optical switch working principle. Fig. 3 is a functional block diagram of the blocking type multi-fiber insertion loss tester of the present application, which is formed by sequentially connecting a multi-path light source output end 70, a light blocking device 80 and a large-area light detector 90.

The light blocking device 80 is a key element of the application, is a multi-channel optical fiber device, and the light blocking device 80 only allows one channel to pass light and blocks other light paths; at the input end of the light blocking device 80, all channels have continuous light, the detector is a shared large-area light detector 90, the receivable range covers all light paths, and one light path is selected to be received by the light blocking device 80; when the light path is switched, the light blocking device 80 is used for replacing the switching coupling of the collimator, so that the change of the light power caused by the re-coupling of the collimator is eliminated; since there is no mechanical movement of the fiber at all, the test data are repeated exactly.

The multiple light sources may be N independent light sources, or N light sources divided by one light source through one 1 to N optical splitters 73, so that the cost of the multiple light sources can be saved.

Fig. 4 is a functional block diagram of a blocking type multi-fiber insertion loss tester to which an optical splitter 73 is added. The light path comprises the following components in sequence: the optical fiber wavelength multiplexer 72, the 1-to-N optical splitter 73, the light blocking device 80 and the large-area light detector 90, wherein the wavelength light source 71 is a multipath light source.

The wavelength light sources 71 of fig. 4 include, but are not limited to, a wavelength 1310nm light source, a wavelength 1550nm light source, and are all temperature controlled lasers. The two light sources of the temperature control laser are selectively conducted, after being combined by the optical fiber wavelength combiner 72, one light source is divided into multiple light sources by the splitter 73, and the multiple light sources are output from the multiple light source output end 70 and output to the light detector 90 through the light blocking device 80. Also connected between the light blocking device 80 and the light detector 90 of fig. 4 are a plurality of MPO connectors 81, the MPO connectors 81 being one of the most common types of multi-fiber connectors.

The temperature-controlled wavelength light source 71 can maintain stability and consistency of the light source and improve accuracy of test results. Wavelength light source 71 includes, but is not limited to, 1310LD, 1550LD, DFB Laser, DBR Laser, VCSEL Laser, tuneable Laser.

The light blocking device 80 of the present application includes, but is not limited to, a PLC blocking chip, where the light blocking device 80 is disposed between the multi-path light source output terminal 70 and the photodetector 90, and the light blocking device 80 only allows any one path to pass light and blocks the rest of the light paths, i.e., the light blocking device 80 can implement a single light path blocking scheme and is applied to a single channel blocking type optical switch.

In embodiment 1, the light blocking device 80 may be composed of N single-channel mechanical optical switches; FIG. 5 (A) is a schematic diagram of the appearance of a single-channel mechanical optical switch with two optical fibers, one in and one out; FIG. 5 (B) is a schematic diagram of the optical path of a single-channel mechanical optical switch, in which a light blocking member 10 is inserted between two precisely aligned fiber collimators to control the on and off of the optical path; each single-channel mechanical optical switch can independently switch and control an optical path and keep the on and off states of the optical path under the condition of no power.

The single-channel mechanical optical switch is adopted, a multi-channel single-channel mechanical optical switch array can be formed, the scheme is adopted at first, and the single-channel mechanical optical switch is a mature product which can be purchased in the market. Fig. 6 is a physical diagram of a 12-way single-channel mechanical optical switch array, with 6 ways on each of the upper and lower layers. The scheme has no extra power consumption and meets the environmental protection requirement; the optical switch does not generate heat, and the circuit temperature drift is low; the light path stability is high. However, this solution has the disadvantages: the optical switch has the advantages of low speed, large size of the optical switch array, complex circuit driving, high cost, and low reliability due to a plurality of separation components.

In embodiments 2-4, the light blocking device 80 includes the multi-path fiber collimator assembly 50, the light blocking member 10, the driving apparatus 30, and the collimator alignment base 20; the multi-path optical fiber collimator assemblies 50 are arranged on the collimator alignment base 20, the multi-path optical fiber collimator assemblies 50 comprise precisely aligned input optical fiber collimators 51 and corresponding output optical fiber collimators 52, the one-to-one correspondence of optical paths is ensured, and measurement errors are reduced; the light blocking component 10 is movably arranged between the input optical fiber collimator 51 and the output optical fiber collimator 52, the light blocking component 10 is provided with a light through hole 11, and the light through hole 11 only allows one optical fiber collimator assembly 50 to pass light and blocks other optical fiber collimator assemblies 50; the driving end of the driving device 30 is connected with the light blocking component 10, the driving device 30 enables the light passing holes 11 of the light blocking component 10 to sequentially move along the arrangement route of the optical fiber collimator assembly 50, so that accurate switching reconstruction of the optical path is realized, mechanical movement of an optical link and the optical fiber collimator assembly 50 is avoided, optical fibers are prevented from being damaged, meanwhile, consistency of position degree in switching the optical link is ensured, stability and accuracy of the optical path are improved, and the optical path is not easily affected by vibration; the driving device 30 comprises, but is not limited to, a stepping motor and a servo motor, and realizes accurate control of rotation; the fiber collimator assembly 50 is routed in a circular or linear shape.

With respect to the drawbacks of embodiment 1, in the solution of embodiment 2 of the present application, referring specifically to fig. 7 to 8, fig. 7 and 8 are schematic diagrams of an assembled structure and a schematic exploded structure of the light blocking device 80 of embodiment 2.

The N fiber collimator assemblies 50 are linearly arranged on the collimator alignment base 20, each fiber collimator assembly 50 including an input fiber collimator 51 and a corresponding output fiber collimator 52 that are precisely aligned, forming N fiber channels.

In the free space between the opposite fiber collimators, a light blocking member 10 is movably disposed between the input fiber collimator 51 and the output fiber collimator 52, and the light blocking member 10 is provided with a light passing hole 11 for passing only one fiber collimator assembly 50 and blocking all other fiber collimator assemblies 50.

The light blocking component 10 can be annular and made of soft light absorbing materials, a light passing hole 11 corresponding to the collimator assembly is formed in the light blocking component 10, and a transmission piece is arranged on the light blocking component 10 and connected with a transmission end of the driving device 30.

The drive means 30 includes, but is not limited to, a stepper motor, a servo motor. When the driving device 30 rotates, the driving member is driven to operate, so that the light blocking member 10 reciprocates along the length direction of the accommodating groove 43, and the on and off of an optical path are independently controlled, and can be kept in an on or off state without power.

The light blocking member 10 may also be provided as a linear blocking plate.

Embodiment 2 overcomes the disadvantages of the 12-way optical switch array of embodiment 1, such as slow speed, complex driving, high cost and low reliability, but still has a larger volume, which is disadvantageous for miniaturization of the test system.

In embodiment 3 of the present application, referring specifically to fig. 9, fig. 9 is a schematic diagram of an assembled structure of the light blocking device 80.

The N fiber collimator assemblies 50 are linearly arranged on the collimator alignment base 20, each fiber collimator assembly 50 including an input fiber collimator 51 and a corresponding output fiber collimator 52 that are precisely aligned, forming N fiber channels.

The light blocking component 10 movably arranged between the input optical fiber collimator 51 and the output optical fiber collimator 52 is a cylinder, and N light through holes 11 are formed in the cylinder and distributed in a spiral equidistant manner along the length direction of the cylinder. One end of the cylinder is provided with a transmission member which is connected with the driving device 30 through a connecting shaft device so as to enable the cylinder to rotate around the shaft.

When the cylinder rotates along the axis, only one path of light through hole 11 is communicated with a pair of fiber collimators, and other fiber collimators are blocked by the walls of the light through hole 11. And may remain open or closed without power.

The light blocking device 80 of fig. 9 is designed to occupy a very small volume, be easy to drive, and be a very optimized design. However, due to the working distance limitation of the fiber collimator, the diameter of the cylinder cannot be too large, so that the number of light-passing holes 11 cannot be too large. This design is suitable for cases where the number of channels is not too large, for example 12.

In embodiment 4, referring specifically to fig. 10 to 11, fig. 10 and 11 are an assembled structure schematic view and a structure exploded schematic view of the light blocking device 80 of embodiment 4.

The light blocking device 80 includes an N-way fiber collimator assembly 50, a light blocking member 10, a driving apparatus 30, and a collimator alignment base 20.

On the collimator alignment base 20, N fiber collimator assemblies 50 are disposed along a circumference, each fiber collimator assembly 50 including an input fiber collimator 51 and a corresponding output fiber collimator 52 precisely aligned to form N fiber paths.

The light blocking member 10 movably disposed between the input optical fiber collimator 51 and the output optical fiber collimator 52 is circular, and one light passing hole 11 corresponding to the collimator assembly is formed in the light blocking member 10.

The driving end of the driving means 30 is connected to the light-blocking member 10. The driving device 30 rotates to drive the circular light blocking component 10 to rotate around the circle center, and blocks the N paths of optical fiber collimator assemblies 50 which are circularly arranged, only one path of optical fiber collimator assembly 50 is enabled to transmit light, and all other optical fiber collimator assemblies 50 are blocked.

The drive means 30 include, but are not limited to, stepper motors, servo drives, enabling precise control of the rotation.

Example 4 has been made. Fig. 12 is a physical photograph of the product of the light blocking device 80 of this embodiment 4, and the N-way fiber collimator assembly 50, the stepper motor, and the motor coupling are all clearly visible.

The light blocking device 80 design of example 4 has been successfully used in a "blocking" multi-fiber insertion loss test system. Fig. 13 is a photograph of this test instrument. The light source signal is output from the output of an MPO connector 81, to the right of which is the MPO interface of the large area photodetector 90.

Actual tests show that the testing instrument has the following characteristics:

1) The test speed is high:

because the optical path is not changed at all, the steady state is restored after the optical path does not need to wait for movement, and the test speed is obviously accelerated. The insertion loss of 12 MPOs is completed in less than 1 second and displayed on a computer screen. This is also the case without optimizing the test parameters. All existing multi-fiber testers measure the insertion loss time of 12 paths of MPOs at least more than 10 seconds. Compared with the existing multi-optical fiber insertion loss testing system based on an optical switch, the blocking type multi-optical fiber insertion loss testing system has the advantage that the speed is improved by more than 10 times.

2) The test repeatability error is almost zero:

since the optical path is not changed at all, the repeatability of the optical signal is excellent, the test is repeated absolutely, and the error is almost zero when the test is repeated. Fig. 14 is a product test data screenshot of this test instrument. It can be seen that the error is within 0.01 dB. This minor error is due, in part, to random variations in the light source, and rounding errors. The device can be used as calibration device of other multi-fiber insertion loss test systems.

3) Energy saving:

continuous power-up is not needed to maintain the on-off state of the light path. The energy consumption is reduced, and the environment is protected.

4) The structure is firm:

because of no precise moving parts, the test instrument has a firm structure, can be made into a portable instrument and can be applied to a test site.

5) Low cost:

because high machining precision is not needed, no complex circuit system is provided, the manufacturing cost of the test instrument is low, and the test instrument is cheap.

Further, the collimator alignment base 20 includes a fixing base and two mounting blocks 40 mounted on the fixing base, the two mounting blocks 40 are disposed on two sides of the light blocking component 10 in parallel, mounting through holes 41 corresponding to the plurality of optical fiber collimator assemblies 50 are formed in the mounting blocks 40, so that production and assembly are facilitated, and accommodating grooves 43 corresponding to the light blocking component 10 are formed in one sides of the two mounting blocks 40, which are close to the light blocking component 10, so that the light blocking component 10 can work normally under the driving of the driving device 30; the mounting blocks 40 are further provided with first avoiding through holes 42 corresponding to the transmission ends of the driving devices 30, and the two mounting blocks 40 are connected with the collimator alignment base 20 through the first mounting plates 21.

Further, the driving device 30 is fixed on the collimator alignment base 20 through the second mounting plate 22, the second mounting plate 22 is in an L shape, the second mounting plate 22 comprises a transverse plate 221 and a vertical plate 222, the transverse plate 221 is vertically connected with the vertical plate 222, the transverse plate 221 is further connected with the collimator alignment base 20, a second avoiding through hole 223 corresponding to the driving end of the driving device 30 is formed in the vertical plate 222, the stability of the whole structure is improved, meanwhile, the connection between the driving end of the driving device 30 and the light blocking device 80 is ensured, and the communication and blocking of an optical link are realized.

The four previous embodiments are all based on mechanical movement. The light blocking device 80 may also be based on a chip process. No moving parts, super miniaturization, lower cost and easy manufacturing of portable instruments.

Fig. 15 is a schematic structural view of a PLC chip-based light blocking device 80. A PLC blocking chip is coupled and permanently fixed by two one-dimensional fiber arrays and packaged into a suitable device housing.

Fig. 16 is a cross-sectional view of the PLC blocking chip-based light blocking device 80.

In embodiment 5, referring to fig. 15 to 16, the light blocking device 80 is a PLC blocking chip, the PLC blocking chip includes a chip main body 62, multiple input ports 60 and output ports 61, the multiple input ports and the output ports are arranged on two sides of the chip main body 62 in a one-to-one correspondence, the chip main body 62 includes a housing 621 and an integrated component 622 disposed in the housing 621, the integrated component 622 includes an electrode layer 6221, a liquid crystal layer 6222, a reflective grating, a waveguide layer 6224 and a substrate 6225, the waveguide layer 6224 is disposed on the substrate 6225, the reflective grating is disposed between the waveguide layer 6224 and the liquid crystal layer 6222, the electrode layer 6221 is disposed on an end surface of the liquid crystal layer 6222 away from the reflective grating, the reflective grating 6223 is covered by the liquid crystal layer 6222, the refractive index of the liquid crystal layer 6222 is adjustable by voltage, the reflectivity of the reflective grating 6223 varies with the voltage, and when the refractive index of the liquid crystal layer 6222 is equal to the reflectivity of the reflective grating 6223, light is allowed to pass, so as to realize optical link communication; when the refractive index and the emissivity of the reflection grating 6223 differ greatly, light is reflected largely, the transmittance is close to zero, and blocking of the optical link is realized.

The whole process has no relative mechanical movement, small structure and microminiaturization; the shell 621 is also provided with a waveguide corresponding to the reflection grating 6223, so that the switching reconstruction of the optical link is facilitated.

Working principle: the continuous light exists in all the paths, the light detector 90 is a shared large-area detector, all the light paths can be accepted, and the PLC blocks the chip to select one path to replace the switching coupling of the collimator, so that only one path of optical fiber passes light at any time, and the change of the light power caused by the re-coupling of the collimator during the light path switching is eliminated.

The above description is only of the preferred embodiments of the present application and is not intended to limit the application, but any modifications, equivalents, improvements, etc. within the principles of the present application should be included in the scope of the present application.

Claims (10)

1. A blocking type multi-fiber insertion loss test system is characterized in that: the light blocking device (80) is a multipath-in and multipath-out optical fiber device, is arranged between the multipath light source output end (70) and the optical detector (90), and only allows any one path of light to pass through the light blocking device (80) and blocks other light paths.

2. The blocking multi-fiber insertion loss testing system according to claim 1, wherein: the light blocking device (80) includes, but is not limited to, a PLC blocking chip.

3. The blocking multi-fiber insertion loss testing system according to claim 1, wherein: the light blocking device (80) comprises a multi-path optical fiber collimator assembly (50), a light blocking component (10), a driving device (30) and a collimator alignment base (20);

the optical fiber collimator assemblies (50) are arranged on the collimator alignment base (20), and each optical fiber collimator assembly (50) comprises an input optical fiber collimator (51) and a corresponding output optical fiber collimator (52) which are precisely aligned;

the light blocking component (10) is movably arranged between the input optical fiber collimator (51) and the output optical fiber collimator (52), a light passing hole (11) is formed in the light blocking component (10), and the light passing hole (11) only allows one path of optical fiber collimator assembly (50) to pass light and blocks other optical fiber collimator assemblies (50);

the driving end of the driving device (30) is connected with the light blocking component (10), and the driving device (30) enables the light passing holes (11) of the light blocking component (10) to sequentially move along the arrangement route of the optical fiber collimator assembly (50).

4. A blocking multi-fiber insertion loss testing system according to claim 3, wherein: the driving device (30) comprises, but is not limited to, a stepping motor and a servo motor.

5. A blocking multi-fiber insertion loss testing system according to claim 3, wherein: the fiber collimator assembly (50) is arranged in a circular or linear path.

6. A blocking multi-fiber insertion loss testing system according to claim 3, wherein: the optical fiber collimator assembly (50) is arranged in a circular route, the light blocking device (80) is in a circular shape, and the driving device (30) drives the light blocking component (10) to rotate along the circle center.

7. A blocking multi-fiber insertion loss testing system according to claim 3, wherein: the light blocking component (10) is made of soft light absorption materials and is annular, and only one light passing hole (11) corresponding to the optical fiber collimator assembly (50) is formed in the light blocking component (10).

8. A blocking multi-fiber insertion loss testing system according to claim 3, wherein: the light blocking component (10) can be in a bar shape, a plurality of light passing holes (11) are formed in the light blocking component (10), and the light passing holes (11) are spirally distributed along the length direction of the light blocking component (10).

9. The blocking multi-fiber insertion loss testing system according to claim 2, wherein: the PLC separation chip comprises a chip main body (62), multiple paths of input ports (60) and output ports (61), the multiple paths of input ports (60) and the multiple paths of output ports (61) are arranged on two sides of the chip main body (62) in a one-to-one correspondence mode, the chip main body (62) comprises a shell (621) and an integrated component (622) arranged in the shell (621), the integrated component (622) comprises an electrode layer (6221), a liquid crystal layer (6222), a reflection grating (6223), a waveguide layer (6224) and a substrate (6225), the waveguide layer (6224) is arranged on the substrate (6225), the reflection grating (6223) is arranged between the waveguide layer (6224) and the liquid crystal layer (6222), the electrode layer (6221) is arranged on one end, far away from the reflection grating (6223), the refractive index of the liquid crystal layer (6222) is changed by adjusting the voltage of the electrode layer (6221), the waveguide layer (6224) is blocked, and any input port (60) and all other ports (61) are not all light paths.

10. The blocking multi-fiber insertion loss testing system according to claim 1, wherein: the multi-path light source output end (70) is formed by sequentially connecting a plurality of wavelength light sources (71), a plurality of blocking optical switch pieces (76), an optical fiber wavelength combiner (72) and a splitter (73), any one of the wavelength light sources (71) is divided into multi-path light sources, and the multi-path light sources are output from the multi-path light source output end (70).