TIA-455-220-A-2003.pdf
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1、 TIA DOCUMENT FOTP-220 Differential Mode Delay Measurement of Multimode Fiber in the Time Domain TIA-455-220-A (Revision of TIA/EIA-455-220) January 2003 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of Copyright Telecommunic
2、ations Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:22:15 MDTNo reproduction or networking permitted without license from IHS -,-,- NOTICE TIA Engineering Standards and Publications are designed to serve
3、 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 their particular need. The existence of such
4、Publications shall not in any respect preclude any member or non-member of TIA from manufacturing or selling products not conforming to such Publications. Neither shall the existence of such Documents preclude their voluntary use by non-TIA members, either domestically or internationally. TIA DOCUME
5、NTS TIA Documents contain information deemed to be of technical value to the industry, and are published at the request of the originating Committee without necessarily following the rigorous public review and resolution of comments which is a procedural part of the development of a American Nationa
6、l Standard (ANS). Further details of the development process are available in the TIA Engineering Manual, located at http:/www.tiaonline.org/standards/sfg/engineering_manual.cfm TIA Documents shall be reviewed on a five year cycle by the formulating Committee and a decision made on whether to reaffi
7、rm, revise, withdraw, or proceed to develop an American National Standard on this subject. Suggestions for revision should be directed to: Standards Annex D is informative and is not considered part of this standard (Calculation information) Annex E is informative and is not considered part of this
8、standard (References) Key words: multimode, differential mode delay, effective modal bandwidth, calculated effective modal bandwidth, DMD, EMB, EMBc iii Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not fo
9、r Resale, 03/29/2007 21:22:15 MDTNo reproduction or networking permitted without license from IHS -,-,- TIA-455-220-A This Page Left Blank iv Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 0
10、3/29/2007 21:22:15 MDTNo reproduction or networking permitted without license from IHS -,-,- TIA-455-220-A FOTP-220 Differential mode delay measurement of multimode fiber in the time domain 1. Introduction 1.1 Intent This document describes a method for characterizing the modal structure of a graded
11、 index multimode fiber. In the procedure described in this standard, the output from a fiber that is single-mode at the test wavelength excites the multimode fiber under test. The probe spot is scanned across the endface of the fiber under test, and the optical pulse shape and delay are determined a
12、t specified offset positions. Two results can be produced from the same data. First, the difference in optical pulse delay time between the fastest and slowest mode groups of the fiber under test can be determined. The user specifies the upper and lower limits of radial offset positions over which t
13、he probe fiber is scanned in order to specify desired limits of modal structure. Second, the optical pulse shapes can be combined using specific weights to determine a calculated effective modal bandwidth (EMBc), and by calculating a sequence of EMBc values with different sets of weights, a minimum
14、EMBc can be calculated, corresponding to a range of transmitters. The test quantifies the effects of interactions of the fiber modal structure and the source modal characteristics excluding the source spectral interactions with fiber chromatic dispersion. Adding the effects of chromatic dispersion a
15、nd source spectral width will reduce the overall transmission bandwidth, but this is a separate calculation in most transmission models. In this test, the effects of non-zero spectral width are minimized but any residual effects will tend to increase the DMD value and decrease the EMBc value. 1.2 Sc
16、ope This standard applies only to multimode, graded-index glass-core glass-clad fibers (material class Ia, as listed in TIA/EIA-4920000-B) Note: This test method is commonly used in production and research facilities and is not easily accomplished in the field. 1.3 Definitions The user of this stand
17、ard specifies either the maximum DMD for the outer (ROUTER) and inner (RINNER) limits of radial offset position over which the probe spot is scanned, or the minimum EMBc for the EMBc values from a sequence of DMD weights. The estimated difference in optical pulse delay time between the fastest and s
18、lowest modes excited for all radial offset positions between and including RINNER and ROUTER will be called Differential Mode Delay (DMD). The Effective Modal Bandwidth (EMB) is the bandwidth associated with the transfer function, H(f), of a particular laser/fiber combination. 1 Copyright Telecommun
19、ications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:22:15 MDTNo reproduction or networking permitted without license from IHS -,-,- TIA-455-220-A 2 Normative references Test, inspection, and safety req
20、uirements may include, but are not limited to, the following references: ANSI Z136.1: American National Standard for Safe Use of Lasers ANSI Z136.2: American National Standard of the Safe use of Optical Fiber Communications Systems Utilizing Laser Diode and LED Sources TIA/EIA-440-B Fiber Optic Term
21、inology TIA/EIA 4920000-B Generic specification for Optical Fibers FOTP-57 (TIA/EIA-455-57B) Optical fiber End Preparation and Examination FOTP-127 (TIA/EIA-455-127) Spectral Characterization of Multimode Laser Diodes FOTP-168 (TIA/EIA-455-168A) Chromatic Dispersion Measurement of Multimode Graded-I
22、ndex and Single-Mode Optical Fibers by Spectral Group Delay Measurement in the Time Domain FOTP-191 (TIA/EIA-455-191) Measurement of Mode Field Diameter of Single-Mode Optical Fiber FOTP-203 (TIA/EIA-455-203) Launched Power Distribution Measurement for Graded Index Multimode Fiber Transmitters FOTP-
23、204 (TIA/EIA-455-204) Measurement of Bandwidth on Multimode Fiber FOTP-230 (to be TIA/EIA-455-230) Effective Bandwidth (EB) Measurement on Multimode Fiber OFSTP-4 (TIA/EIA-526-4) Optical Eye Pattern Measurement Procedure 3 Apparatus 3.1 Light Source Use a light source that introduces short duration,
24、 narrow spectral width pulses into the probe fiber, as defined below. The temporal duration of the optical pulse shall be short enough to measure the intended differential delay time. The maximum duration allowed for the optical pulse, characterized as full width at 25% of maximum amplitude, will de
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