ANSI TIA EIA 455-54B-1998 FOTP-54 Mode Scrambler Requirements for Overfilled Launching Conditions to Multimode Fibers《FOTP-54，使多模光纤处在过激励状态的模量化要求》.pdf

1、ANSI/TIA/EIA-455-54B-l998 Approved: June 24, 1998 Reaffirmed: December 26, 2001 The Teleconmiunications Industry Association represents the conmiunications sector of Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted w

2、ithout license from IHS-,-,-NOTICE TIA/EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selectin

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6、quirements. 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 Standards Proposal No. 3-3149-RF1, formulated under the cognizance of the TIA FO-6.6 Subcommittee

7、on Optical Fibers.) This Document was reaffirmed by the American National Standards Institute (ANSI) on December 26,200 1, and by the TIA. Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 1998 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refe

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19、without license from IHS-,-,-STD*EIA TIA-455-54B-ENGL 1778 3234b0Cl Ob13714 487 TIA/EIA STANDARD FOP-54 Mode Scrambler Requirements for Overfilled Launching Conditions to Multimode Fibers TIAlEIA-455-54B (Revision of EIAITIA455-54A) TELECOMMUNICATIONS INDUSTRY ASSOCIATION INDUTWAS.WCM7? Electronic I

20、ndustries Alliance Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - STD-EIA TIA-455-54B-ENGL 1998 1111 323YbOn Ob13715 315 NOTICE WEM Engineering Standards and Publications are designe

21、d to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of s

22、uch Standards and hiblications shall not in any respect preclude any member or nonmember of WEIA from manufacturing or selling products not conformkg to such Standards and hiblications, nor shali the existence of such Standards and Publications preclude their voluntary use by those other than WEIA m

23、embers, whether the standard is to be used either domestically or internationally. Standards and Publications are adopted by TIA/EIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, WELA does not assume any liability to any patent owner, nor does it

24、assume any obligation whatever to parties adopting the Standard or Publication. This Standard does not purport to address ail safety problems associated with its use or aU appiicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and he

25、alth practices and to determine the applicability of regulatory limitations before its use. (From standards Proposal No. 3149, formulated under the cognizance of the TIA FO-6.6 Subcommittee on Optical Fibers it is not intended to necessarily give the best bandwidth prediction for concatenated length

26、s. Also, a particular light source/mode scrambler combination may be satisfactory for one size core diameter and numerical aperture test fiber, but not for another. _ 2 Normative references Test or inspection requirements may include, but are not limited to, the following references: FOTP-30 (EIATTI

27、A-455-30B) Frequency Domain Measurement of Multimode Optical Fiber Information Transmission Capacity 1 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-45 5-548 FOTP-43 (EIA-455-4

28、3) Output Near- Field Radia tion Pattern Measurement of Optical Waveguide Fiber FOTP-47 (EIATTIA-45 5-478) O u tp ut Far- Field Ra dia tio n Pa t t ern Measurement FOTP-51 (EIATTIA-455-51 A) Pulse Distortion Measurement of Multimode Glass Op tical Fiber Information Transmission Capacity FOTP-58 (EIA

29、TTIA-455-58A) Core Diameter Measurement of Graded-Index Optical Fibers . FOTP-177 (TIA/EIA-455-177A) NumericalAperture Measurement of Graded- index Optical Fibers 3 Apparatus 3.1 Light Source Use a light source such as a laser diode. FOTPs which reference FOTP-54 may place further requirements on th

30、e light source. If FOTP-54 is used for information transmission capacity measurements, use a light source as described in FOTP-30 or FOTP-51. 3.2 Mode scrambler 3.2.1 Definition A “mode scrambler” is a device which is positioned between the light source and test fiber to control launching conditions

31、. A particular mode scrambler design is not specified; however, examples of successful mode scramblers consisting of an optical 2 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-

32、45 5-54B fiber or fibers with associated optics are given in Figure 1. It should be emphasized that the performance of these scramblers depends upon the launch optics and fiber sizes (core and NA) used in the actual construction. 3.2.2 Mode scrambler examples Two designs are given for illustration p

33、urposes only. Other designs may perform as well. 3.2.2.1 Step-Graded-Step The mode scrambler in Figure l(a) is a series combination of 1 m lengths of step, graded, and step index fibers spliced together. See references B1 and B2 of Annex B for information concerning fabrication of mode scramblers ac

34、cording to the step- graded-step design. 3.2.2.2 Step with bends The mode scrambler in Figure l(b utilizes a single length of step index fiber. See references B3 and 84 of Annex B for further information concerning the fabrication of step-index fiber mode scramblers. In some instances macroscopic, s

35、erpentine bends or wrapping several turns of the step-index fiber around a mandrel will make the mode scrambler less sensitive to the laser diode alignment. 3.3 Test apparatus to qualify mode scrambler To qualify the mode scrambler, it is necessary to measure near- and far-field radiation patterns o

36、f the output of the mode scrambler when coupled to the light source of 3.1. Appropriate test apparatus is described in FOTP-43 and FOTP-47. If the qualification tests are performed on an image of the mode scrambler output, the appropriate test apparatus may differ from that described in FOTP-43 and

37、FOTP-47. 3.4 Micro position in g d evice/o p tics Apparatus to couple light from the mode scrambler to the test fiber is needed. This may be a micropositioner along with optics to image the mode scrambler output to the input end of the test fiber. Alternatively, a temporary splice to butt-couple the

38、 mode scrambler output to the input end of the test fiber may be employed. 3 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/EIA-45 5-54B 3.5 Cladding mode strippers If the mode scra

39、mbler is used in applications where fiber attenuation is measured, apply a cladding mode stripper to the test fiber unless the fiber buffer coating is sufficient to strip cladding light. 4 Sampling and specimens The test sample includes the optical source and mode scrambler device. Also included are

40、 positioning devices, associated optics such as connectors and optical imaging systems, and fiber to be used in the measurement system. _ 5 Procedure 5.1 Qualification of mode scrambler The mode scrambler, regardless of design, shall be sufficient to reliably reproduce the launching conditions of 5.

41、1.1 and 5.1.2 and 5.1.3 to the test fiber. If the launching conditions to the test fiber remain stable enough to meet the required launching conditions for all subsequent measurements, the qualification tests need not be made in situ and shall not be required for every test using the mode scrambier.

42、 Such stability may be obtained, for example, by permanently pigtaiiing or permanently connectorizing the source to the mode scrambler. For many mode scrambler designs, however, the launching conditions produced depend on the source/mode scrambier alignment and interaction with any intermediary opti

43、cs such as connectors or optical imaging systems. If the source or any component in the optical system is changed, the qualification tests shall be repeated. 5.1.1 Launch spot on test fiber With the light source coupled to the mode scrambler fiber, the near-field radiation pattern which excites the

44、test fiber core shall vary by less than 25% across the test 4 Copyright Electronic Industries Alliance Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-EIA TIA-Y55-5qB-ENGL 1778 I3234b00 ObL3722 555 W TIA/ElA-455-546 fiber c

45、ore area. If the core diameter of the test fiber is not known, it shall be determined by FOTP-58. If the mode scrambler is connected directly to the test fiber, the near-field radiation pattern which excites the test fiber core shall be measured in accordance with FOTP-43. If the mode scrambler outp

46、ut is optically imaged onto the test fiber input, the launched near-field distribution shall be determined and referenced to a near-field defined by FOTP-43. 5.1.2 Launch radiation angle to test fiber With the light source coupled to the mode scrambler fiber, the angular intensity distribution which

47、 excites the test fiber shall be measured. The launch numerical aperture, defined as the sine of the half-angle at which the launched angular intensity has decreased to 5 percent of the maximum value, shall exceed the 5 percent numerical aperture of the test fiber. If the 5 percent numerical apertur

48、e of the test fiber is not known, it shall be determined by one of the procedures of FOTP-177. If the mode scrambler is connected directly to the test fiber, the angular intensity distribution from the mode scrambler fiber which excites the test fiber core shall be measured in accordance with FOTP-4

49、7. If the mode scrambler output is optically imaged onto the test fiber input, the launched angular intensity distribution shall be determined and referenced to a far-field defined by FOTP-47. 5.1.3 Additional requirements on launch using restricted measurements In order to achieve a truly uniform launch distribution, one of the following tests shall be performed and its requirements met. This is in addition to the