JPS58191947A - Inspecting device of optical fiber - Google Patents

Abstract

PURPOSE:To compare a transmission loss with a standardized value to inspect an optical fiber, by providing a standardized value setting function and a function, where a measured value and the standardized value are compared with each other to discriminate the measured value, besides a function where the transmission loss of the optical fiber is measured. CONSTITUTION:An inspecting device main body 5 consisting of an AD converter 6, a DA converter 7, a microcomputer (muCPU) 8, a memory 9, etc. and measuring modules 2 separated from the main body 5 are provided. A reference optical fiber 15 is connected between measuring modules, and output voltages of light receiving parts of respective measuring modules are stored in the memory 9 successively. Next, the fiber 15 is removed, and an optical fiber 1 to be inspected is connected between measuring modules, and a mode switch 12 is set to the measurement mode. Each time an input is selected, a digital input value to the DA converter 7 which corresponds to this input and is obtained by the reference optical fiber is read out from the memory 9 and is given to the AD converter 6, and the conversion required for decibel display or the like is operated in the muCPU8, and the result is displayed on a display 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for inspecting the transmission loss of an original fiber by comparing it with a standard value.

In the conventional original fiber propagation loss sub-determination device, the −4 end of the optical fiber under test is input into the original fiber, and the other end receives the light of 9 and the loss k is calculated.
#J is determined. Therefore, it is possible to measure the transmission loss of a 7t fiber, but it is necessary to check whether the transmission loss of the optical fiber is larger than the standard value by II%A. There wasn't. For example, an assembler examines and cuts a +7 fiber to a length, and attaches one connector to both ends of the connector.
When a company wants to check whether the transmission loss of the original fiber of the length satisfies the standard, the present invention incorporates the above conventional technique and compares the transmission loss of the original fiber with the standard value. Provide testing equipment'f:
purpose. This purpose is based on the original fiber transmission loss t C
In addition to the function of determining 1j, the present invention will be described with reference to 0 or less, which can be made into an appropriate number by combining the standard value setting function, the quantitative determination scale, and the soft judgment function of Rule II6wL.

Figure 1 a One example of the present invention
As shown in the figure, two bare original fibers 1t-1 to 1 to 1-4 and the so-called original fibers of n91 are arranged using the moxibustion number...
In Figure 1, 2 is a single module, and 2-1 to 2-8 are used depending on the aK of 9 fibers that go into the Aiba harness. Multiple pieces are provided n12 Marnafu VI #3 e
4, it is connected to the main body 5 of the calibration device I11. The original connector la of the original fiber l is attached to each sliding module 2.
K is connected to the original connector 2ak4 of the two circuits to be repaired, and although not shown, is connected to a detection section consisting of one path for outputting the foot output of one of the original connectors 2a, as well as to the other path of the original connector 2m. A light-receiving section consisting of a light-receiving element and a circuit for converting the photoelectric voltage of this light-receiving element into a photovoltaic voltage. An electrical connector 20 for connecting to a multiplexer 4 is provided. The fibers of each party are connected between the measurement modules of 1rj216i and 216i, and by the selection operation of the multiplexer 3.4, the optical sound input 6n is received from one end and the light is received at the other end. i6.f) A converter 7
．． Microcomputer (μC)'LJ) 8, memory Q, (j4 loss KvAT) each frame data setting aXO.

M1 foot mo/Neil and former fiber combination information @O entry car 1
1. Change the mode switch 12 and display 13.
14rL data bus ・AD conversion a 6 rl multiluxer 4t bus 1 and analog output from the light receiving part of measurement module 2 manually converted to digital signal, or during conversion, reference voltage input terminal @aK It has the same bit number as the ODA converter 7 and the AD converter 6, which converts the analog voltage into digital as a full scale, and the microcomputer 80 system converts it into a digital signal.
When two pairs of reference optical fibers (15 are connected, the digital output of AD conversion base 6 is converted into an analog note &
A reference optical fiber 15U with negligible or known loss is provided and used for certain calibrations. Note that 15a is the original connector for two circuits.

Microcomputer 8a Malteflects 3゜4,A
Control of the D converter 6 and DA converter 7, calculation of transmission loss for one line, and calculation of standard values.

Comparison of transmission loss standard value and wiring judgment [
・Operation of the apparatus of this embodiment along with the calculations of the microcomputer 8 [Description ・(1) Calibration: Connect the reference optical fiber 15 between each measurement module, and set the mode switch 12 to the calibration mode. The output voltage of the light receiving section of each measurement module is sequentially applied to the AD converter 6 by controlling the 71 cross-ship unit 8 section Martel +j3.4, and @DA conversion is performed so that the digital output of this AD converter 6 becomes full scale. The digital input mt'* to the device 7 is sequentially stored in the memory 9.

(Theory) Measurement of propagation J8 loss: Next, reference optical fiber 15
tjAt, connect the optical fiber under test to each gluing module, and set the mode switch 12Yr to gluing mode. Oiklov) σ′ヱ・-28 multi-IV length 3.
4tllilJ to sequentially switch the manual power to AD conversion gih, and each time each input is selected, the corresponding reference optical fiber is read out from memory 9 to digital input IIl' to DA transformer 7, and DA conversion is performed. The digital output of the AD converter 6 obtained each time the selection is made is the binary output of the total transmission loss of the reference optical fiber 15 obtained by subtracting the total transmission loss of the reference optical fiber 15 from the total transmission loss of the FT7 IVER 1C1 under test. The logic is reversed with respect to #LK, and the influence of the sensitivity fluctuation of the light receiving section on the output light of the light emitting section is reduced to 1. Therefore, the digital output of ^Df:*i@ is inverted, and the 1 microcomputer S calculates a change 114 that is necessary for displaying decibels, etc., and displays the 7th b value on the display 13. In this case, the data setter 10 calculates the total transmission loss of the reference optical fiber 15 by adding the total transmission loss of the input signal. 9. The transmission loss that does not depend on the original connector of the optical fiber l is 0. By adding this #L, the transmission loss that does not depend on the original connector of the optical fiber under test l can be obtained. (2) Standard Pass/fail for the value 2 Pass/Fail of the total transmission loss of the test source fiber t-em @Total transmission loss of the general IIc fiber TL [TL in dBJ = t-t
F+1. ψ + tF/F + Lo/i However, t: The cutting corner of the original fiber J LF The transmission loss of the unit of the binary fiber
/u” Coupling loss between light emitting part and original fiber [dBJLb7h
・：Coupling loss of optical fiber connector (dBJLo/E
: Coupling loss between optical 7 AIPA and receiver (4 EL in dBJ)
Ru. Then mode switch 1f! 12 to the standard mode, and set the setting device 10 to -1t, transmission loss per unit length of 7 fibers LP-fi fiber length 21 original connector type! 1!1 (This makes LE/(J - LF/F and L
O/W is decided. ), tI# of optical 7-eye connector
Then, based on the stiffness data, the microcomputer 8 calculates the specifications for each of the optical fibers to be tested l-1 to 1-4, and calculates the specifications and the optical fibers to be tested. Pass/fail is determined by comparing the total transmission loss with -j constant value of the total transmission loss, and the table shows the import in 13.

←) Inspection of incorrect placement In the case of two sets of connections, the input and output of each original fiber must correspond to φ. Therefore, the seventh-edge cutter 12 is set to the incorrect placement inspection mode, and the input device 11 [Information about which fiber j is connected to which defining module Ki is entered into the microcomputer 8. If the actual arrangement m is the input information, then the fixed transmission loss is 1fiA, and the true value is 1mK. By shifting the selection of Martegrek'I#''3.4, we can see what kind of C misplacement is 4@IK, and we can display the resultant table of C in Q#!3 diagram. This example is for testing a single-core fiber 16, and is divided into a 611J k module for light emission 17 and light reception 18.Furthermore, an inspection device is used. Main unit r Without using ULIA converter, l
The AD converter 19 is fixed at full scale, and certain fluctuations occur when the single-core reference optical fiber 20 or i11 is connected, and when the standard-core test light 7 fiber 16 is connected. The microcomputer 8 calculates the difference of the digital output of the ALj converter 19 obtained by n, respectively, so that the outputs jt and f of the source section are fixed even if the sensitivity of the receiving section fluctuates by n%. Errors will no longer occur.

Microcomputer 8 [Functions of other parts a 1st]
It is the same as the example in the figure, and the explanation is omitted. Note that 16 a 2
i 7 a @ l 8 a and 20 JIC original connectors, 17b and 18brX electrical connectors・Here I 4 to 1 fixed module 2.17° 18a
In addition to the Shizuno 0 made for the Hitomi Senkan, it may also be used for transmitting modules, receiving modules, and receiving modules for RC such as optical communications. In addition, without using the μ mode switch 121 on the main body of the inspection iron 1, the IC mode automatically switches to the lowest value, or the selection of a martel kuna @Hiroshi Ii! Even if you perform all the actions of the seventh mode, if you use a set of fixed joules, you will need to perform a U-distribution test (the middle one), but the present invention The purpose can be achieved.

11! -KV In the above embodiment, each original phi/( is protruded into the original connector at both ends, but only one end has a stent connector f.
There is no need for the original fiber 1 to be delayed during inspection. In addition, in this case, it is necessary to attach an adapter to the original fiber part @VC that does not have a @jt connector.

As described above, according to the present invention, it is possible to easily test whether the transmission loss of the source fiber satisfies the specifications. In addition, since the measurement module and the inspection device main body can be attached and detached, it is easy to change the wavelength of the light source used and the shape of the connector to 14 by simply replacing it with the standard module. can. History Zezeζ, since the measurement and construction module and 6 connections are switched with a multiplexer, one Mk inspection of the original fiber harness can be done! ! ◎

[Brief explanation of the drawing]

811 figure and ag319a book release 911 storehouses are Dingdencheng-1 21WI! An example of the original fiber harness is shown in the W&D figure. L and 16 section n source fiber, 15 and 20μ reference source fiber, 2.17 and 18ra#lJ rectangular mo/neal, la@2a
s15a, 1 Maa 57j. 18ai and 20aa original connectors, zb, 2c, 17b and 18b frame electrical connectors, 3 and 4 are multiplexers, 5a inspection J1 device body, 6 and 19r [AD[fi device, 6aμ reference voltage input electronics, 7 is IJA complex 8μ71 black computer 9rL memory, 100: Setting device for each loss related data, 1htra
It is an input device for combination information of J constant module and original 7 AIPA, 121 mode switch, 1arx display device, and 14μ data bus. %rtApplicant Sumitomo Electric Industries Co., Ltd.Representative Hitoshi Hitsujishi Department (& 1 & N

Claims (1)

[Scope of Claims] Input/output optical connector corresponding to the optical fiber under test, electrical-to-optical conversion coupled to the original output connector ii5. Input optical connector [k3 connection source for electrical transformer and electrical signal St-e measurement module separated from the main body of the inspection device by a frame, reference source fiber connected between the input and output connectors of the measurement module, Connection to the connection tki5 of said measurement module, II! An AD converter that converts an electrical signal given from the electrical converter of the measurement module into a digital signal through a multiplexer that switches to connection 1 with the constant module, and a multi-channel 1vl'Uk. A setting device for inputting the data necessary for creating standards for the optical fiber under test, and a standard value of transmission loss for each test optical fiber based on the data from this setting device. The results are obtained when the fiber is connected and when the optical fiber under test is connected, respectively.
Output KM 11 Transfer loss of tested fiber [
The control wave Jl which is calculated and whose transmission loss satisfies the applicable standard value is t! The original fiber consists of the main body of the inspection device.