TIA-455-22-B-1993 FOTP-22-B Ambient Light Susceptibility of Fiber Optic Components《FOTP-22 光纤元件的环境光敏感性》.pdf

1、 TIA-455-22-B (Revision of EIA/TIA-455-22-A)March 1993 (r 01/2012) FOTP-22-B Ambient Light Susceptibility of Fiber Optic Components NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers,

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5、ed with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Project No.3-2937, formulated under the cognizance

6、of the TIA TR-42 Telecommunications Cabling Systems, TR-42.13 Subcommittee on Passive Optical Devices and Fiber Optic Metrology). Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current C

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22、TS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. Section 1. 2. 3. 4. 5. 6. 7. 8. EIA TIA-455-22B 73 3234b00 O504794 81 m FOTP-22 lME“T LIGW SUSCEPTIBILITY OF FIBER OPTIC COMPONENTS CONTENTS INTRODUCTION APPLICABLE DOCUMENTS APPARATUS SAMPLING AND SPECIMENS PROCEDURE CALCULATIONS OR INTERPR

23、ETATION OF RESULTS DOCUMENTATION SPECIFICATION INFORMATION APPENDIX COMPARISON BETWEEN FOTP-22 AND IEC, ISO, AND CCITT REQUIREMENTS TABLE 1 SOURCE AND OUTPUT POWER LEVELS FIGURE 1 TEST SETUP FOR CABLE FIGURE 2 TEST SETUP USING SUN AS A SOURCE FIGURE 3 TEST DETECTOR POWER (P,) VS. SOURCE IRRADIANCE (

24、Pa) FIGURE 4 TEST SETUP FOR INTERCONNECTING DEVICE Paqe 1 1 2 3 4 10 11 12 13 7 9 L 1 O EIA TIA-455-22B 93 3234b00 0504795 718 EIA/TIA-455*22B Page 1 FOTP-22 AMBIENT LIGHT SUSCEPTIBILITY OF FIBER OPTIC COMPONENTS (From EIA Standards Proposal No. 2937, formulated under the cognizance of TIA FO-6.3, S

25、ubcommittee on Fiber Optic Interconnecting Devices, TIA FO-6.4, Subcommittee on Fiber Optic Test Methods and Instrumentation, and TIA FO-6.7, Subcommittee on Fiber Optic Cable.) This FOTP is part of the series of test procedures included within Recommended Standard EIA/TIA-455. NOTE : This FOTP was

26、previously published in EIA/TIA-455-22A as FOTP-22. 1. INTRODUCTION This procedure describes a method to establish the susceptibility of components such as cabled fibers, interconnecting devices, splices, or couplers to ambient light. The test conditions simulate expected conditions to which the fib

27、er optic cable or device may be subjected during actual use. NOTE : This test is extremely unlikely to produce failing results for any fiber optic cable . that utilizes a black or other opaque-colored jacket, but cable failures may occur when transparent or translucent jackets are employed. _ - ._ _

28、 - _ EIA TIA-455-22B 73 m 3234600 0504776 654 m EIA/TIA-455-22B Page 2 2. APPLICABLE DOCUMENTS The following documents form a part of this FOTP to the extent specified herein: FOTP-57 (EIA/TIA-455-57A) 1 IEC-874-1, 3rd Ed. 3. APPrnTUS “Standard Test Procedures for Fiber Optic Fibers, Cables, Transdu

29、cers, Sensors, Connecting and Terminating Devices, and Other Fiber Optic Components !Optical Fiber End Preparation and Examination“ !Connectors for optical fibres and cables Unless otherwise specified, the following apparatus anLr equipment are required to perform this test: 3.1 Light Source. Use a

30、noncoherent light source having a spectral range that covers the wavelengths of systems operation. The source stability and spectral width shall be specified in the Detail Specification. This source shall produce a maximum intensity of from 20 to 100 milliwatts/cm2 at the surface of the test sample,

31、 or an intensity as specified in the Detail Specification. Note: The sun may be used as a source. 3.2 Light Chamber. The light chamber shall be such that at least 50% of the surface of the cable or device under test is subjected to the specified light intensity. Seal the chamber entrance and exit po

32、rts against external light in order to allow good definition of light levels at the component. In process of preparation. Pending publication of this revision, use IEC SC86B(Central Office)69, dated July 1989. EIA TIA-455-22B 93 3234600 0504797 590 EIA/TIA-455-22B Page 3 3.3 Optical Detector/Meter.

33、The test detector shall be of sufficient active area and placed sufficiently near the end of It the fiber to detect all light emitted from the fiber end. shall have a 40 dB dynamic range and a sensitivity and noise figure capable of detecting a -60 dBm (1 nanowatt) signal and shall have the linearit

34、y, stability, -and spectral response as specified in the Detail Specification. The meter portion of the detector shall indicate in units of power or be capable of conversion to power units, e.g., microwatts, nanowatts. 3.4 Light-Tight Encosure/Lock-In Amplifier. Use a system to diminish the effects

35、of ambient light on the detected signal. If a light-tight enclosure is not used, then use a lock-in amplifier to diminish the effects of ambient lighting. Take care to ensure that ambient lighting does not saturate the detector. 3.5 Irradiance Meter. The irradiance meter shall have enough range to m

36、easure 100 milliwatt/cm2, or the intensity that the Detail Specification requires to be at the surface of the component. The reproducibility shall be within however, see Note 3 relative to Figure 2.) 5. PROCEDURE NOTE: When testing cable alone, only steps 5.1 through 5.10 apply. When testing a devic

37、e that requires cabling to be attached to it during the test, steps 5.1 through 5.10 are first performed on the cable to be used (or on another cable sample of the same length and type, if several devices are being tested) ; then steps 5.5 and 5.7 through 5.10 are repeated as described in steps 5.11

38、 and 5.12. 5.1 Step 1. To calibrate the reference detector, place an irradiance meter (detector head) in the center of the area where the specimen to be tested will be placed. Aim the meter at the light source. Unless otherwise specified in the Detail Specification, the irradiance meter shall read o

39、ut in milliwatts/cm2, or a conversion formula shall be stated in the results. c * a EIA TIA-455-22B 93 M 3234b00 0504799 363 M EIA/TIA-455-22B Page 5 5.2 Step 2. Turn on the light source and adjust the light intensity to obtain the irradiance meter reading specified in the Detail Specification. 5.3

40、Step 3, Measure and record the irradiance level detected at the reference detector. This is now the reference level equal to the required light intensity at the surface of the cable. The irradiance meter may be removed from the test setup at this time. 5.4 Step 4. Position the sample such that a min

41、imum 2 m (6.6 ft) length of cable (or a length as specified in the Detail Specification) is exposed to the light source. There shall be a maximum of 1 m ( 3.3 ft) of fiber between the chamber and the test detector. See Figures 1 or 2. Light Source lock-in equipment) Light Chamber ._Light Tight Chamb

42、er I I Irradiance Meter (reference detector) Light Tight ni I I I I I - - - -i- - - - Test Detector Figure 1 Test Setup For Cable - - - EIA TIA-455-22B 93 3234600 0504800 905 W EIA/TIA-455-22B Page 6 Sun or other high-intensity light source. Single Layer Coil of Cable Under Test Reference Detecto Pl

43、ane Perpendicular to Light Source Open-topped exposure box with interior walls painted with high-reflective material, such as baiium sulfate. Figure 2 Test Setup Using Sun As A Source NOTE: Although Figure 2 pictures cable in a coiled configuration, care should be taken to avoid making tight bends i

44、n cable specimens. Tight bends could artificially cause a cable having, for example, a transparent jacket, to be overly susceptible to light entry, just as tight bends in fibers are used deliberately to allow light entry and exit for measurement purposes in “Local Injection and Detectionf1 (LID) sys

45、tems. A better arrangement in such cases would be to use a box that is large enough to permit the specimen to lie straight, or nearly straight, in the box. EIA TIA-455-22B 93 3234600 0504803 843 9 5.5 Step 5. Place the end of the fiber to be evaluated in the end positioning device (light tight chamb

46、er or fixture) such that no additional microbending is introduced to the fiber. 5.6 Step 6. Align the end of the fiber to the detector such that all light leaving the fiber is detected. If a lock-in amplifier is not used, the fiber-detector arrangement shall not allow room light into the test detect

47、or. 5.7 Step 70 With the light source off, measure the output of the test detector record it (P ). If the detector output is greater than the noise level 0% the equipment, determine the source of the optical leakage and correct the leakage. This detector output value will be considered to be the dar

48、k current power (Pd). TABLE 1 SOURCE AND OUTPUT POWER LEVELS Source Irradiance (Pa) Test Detector Power (P,) (milliwatts/cm2) (microwatts) 100.0 (initial value) al 50.0 a3 a2 20.0 Ptl Pt2 Pt3 a4 a5 a 10.0 5.0 2.0 t4 t5 Pt6 a7 a8 a9 1.0 0.5 0.2 Pt7 Pt8 Pt9 Palo an 0.1 Pt10 t“ - _ _ EIA TIA-455-22B 93

49、 m 3234600 0504802 788 m EIA/TIA-455-22B Page 8 5.8 Step 8. Turn the light source ON and apply source irradiance (P ) at the levels stated in the preceding Table 1 (note that eq then reduce the source power to the specific values designated. Measure the test detector output power (P,) and record values (i.e., ptl, Pt2, etc.) for each intensity. Unless otherwise specified in the Detail Specification, when the measured test detector power is at the measurement system noise floor with the initial power intensity of 100 milliwatts/cm2 applie