ANSI TIA-455-236-2004 FOTP-236 IEC 61280-2-9 C Fibre Optic Communication Subsystem Test Procedures C Digital Systems C Part 2-9 Optical Signal-to-Noise Ratio Measurement for Dense .pdf

《ANSI TIA-455-236-2004 FOTP-236 IEC 61280-2-9 C Fibre Optic Communication Subsystem Test Procedures C Digital Systems C Part 2-9 Optical Signal-to-Noise Ratio Measurement for Dense .pdf》由会员分享，可在线阅读，更多相关《ANSI TIA-455-236-2004 FOTP-236 IEC 61280-2-9 C Fibre Optic Communication Subsystem Test Procedures C Digital Systems C Part 2-9 Optical Signal-to-Noise Ratio Measurement for Dense .pdf（26页珍藏版）》请在麦多课文档分享上搜索。

1、 TIA STANDARD FOTP-236 IEC 61280-2-9 Fibre Optic Communication Subsystem Test Procedures Digital Systems Part 2-9: Optical Signal-to-Noise Ratio Measurement for Dense Wave-Length Multiplexed Systems TIA-455-236 FEBRUARY, 2004 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunication

2、s industry in association with the Electronic Industries Alliance ANSI/TIA-455-236-2004 Approved: February 3, 2004 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating inte

3、rchangeability 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 Standards and Publications shall not in any respect preclude any member or non-member of TIA from manufacturing or

4、 selling products not conforming to such Standards and Publications. Neither shall the existence of such Standards and Publications preclude their voluntary use by Non-TIA members, either domestically or internationally. Standards and Publications are adopted by TIA in accordance with the American N

5、ational Standards Institute (ANSI) patent policy. By such action, TIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. This Standard does not purport to address all safety problems associated with its use o

6、r 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 Standards Proposal No. 3-0139, formulated under the cognizance of th

7、e TIA FO-4.1 Subcommittee on Fiber Optic) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2004 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current Catalog of TIA TELECOMMUNICATIONS INDUSTRY ASSOCIATION STANDARDS AND ENGINEERING PUB

8、LICATIONS or call Global Engineering Documents, USA and Canada (1-800-854-7179) International (303-397-7956) or search online at http:/www.tiaonline.org/standards/search_n_order.cfm All rights reserved Printed in U.S.A. PLEASE! DONT VIOLATE THE LAW! This document is copyrighted by the TIA and may no

9、t be reproduced without permission. Organizations may obtain permission to reproduce a limited number of copies through entering into a license agreement. For information, contact: Global Engineering Documents 15 Inverness Way East Englewood, CO 80112-5704 U.S.A. or call U.S.A. and Canada 1-800-854-

10、7179, International (303) 397-7956 NOTICE OF DISCLAIMER AND LIMITATION OF LIABILITY The document to which this Notice is affixed has been prepared by one or more Engineering Committees of the Telecommunications Industry Association (“TIA”). TIA is not the author of the document contents, but publish

11、es and claims copyright to the document pursuant to licenses and permission granted by the authors of the contents. TIA Engineering Committees are expected to conduct their affairs in accordance with the TIA Engineering Manual (“Manual”), the current and predecessor versions of which are available a

12、t http:/www.tiaonline.org/standards/sfg/engineering_manual.cfm. TIAs function is to administer the process, but not the content, of document preparation in accordance with the Manual and, when appropriate, the policies and procedures of the American National Standards Institute (“ANSI”). THE USE OR

13、PRACTICE OF CONTENTS OF THIS DOCUMENT MAY INVOLVE THE USE OF INTELLECTUAL PROPERTY RIGHTS (“IPR”), INCLUDING PENDING OR ISSUED PATENTS, OR COPYRIGHTS, OWNED BY ONE OR MORE PARTIES. TIA MAKES NO SEARCH OR INVESTIGATION FOR IPR. WHEN IPR CONSISTING OF PATENTS AND PUBLISHED PATENT APPLICATIONS ARE CLAI

14、MED AND CALLED TO TIAS ATTENTION, A STATEMENT FROM THE HOLDER THEREOF IS REQUESTED, ALL IN ACCORDANCE WITH THE MANUAL. TIA TAKES NO POSITION WITH REFERENCE TO, AND DISCLAIMS ANY OBLIGATION TO INVESTIGATE OR INQUIRE INTO, THE SCOPE OR VALIDITY OF ANY CLAIMS OF IPR. ALL WARRANTIES, EXPRESS OR IMPLIED,

15、 ARE DISCLAIMED, INCLUDING WITHOUT LIMITATION, ANY AND ALL WARRANTIES CONCERNING THE ACCURACY OF THE CONTENTS, ITS FITNESS OR APPROPRIATENESS FOR A PARTICULAR PURPOSE OR USE, ITS MERCHANTABILITY AND ITS NON-INFRINGEMENT OF ANY THIRD PARTYS INTELLECTUAL PROPERTY RIGHTS. TIA EXPRESSLY DISCLAIMS ANY AN

16、D ALL RESPONSIBILITIES FOR THE ACCURACY OF THE CONTENTS AND MAKES NO REPRESENTATIONS OR WARRANTIES REGARDING THE CONTENTS COMPLIANCE WITH ANY APPLICABLE STATUTE, RULE OR REGULATION. TIA SHALL NOT BE LIABLE FOR ANY AND ALL DAMAGES, DIRECT OR INDIRECT, ARISING FROM OR RELATING TO ANY USE OF THE CONTEN

17、TS CONTAINED HEREIN, INCLUDING WITHOUT LIMITATION ANY AND ALL INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIA

18、BILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. 61280-2-9/CDV adopted as TIA-455-236 iCONTENTS FOREWORD ii

19、 1 Scope 1 2 Normative references .2 3 Definitions2 4 Apparatus 3 4.1 Diffraction grating-based OSA .3 4.2 Michelson interferometer-based OSA.4 4.3 Fabry-Perot-based OSA 4 4.4 OSA performance requirements.5 4.4.1 Wavelength range5 4.4.2 Sensitivity5 4.4.3 Resolution bandwidth (RBW)5 4.4.4 Resolution

20、 bandwidth accuracy6 4.4.5 Dynamic range.6 4.4.6 Scale fidelity7 4.4.7 Polarization dependence7 4.4.8 Wavelength data points7 5 Sampling and specimens8 6 Procedure 8 7 Calculations .8 8 Measurement uncertainty .8 9 Documentation .9 Annex A (informative) Error in measuring signal level due to signal

21、spectral width 10 Bibliography .14 61280-2-9/CDV adopted as TIA-455-236 iiINTERNATIONAL ELECTROTECHNICAL COMMISSION _ FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 2-9: Digital systems Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems FOREWORD 1)

22、The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co-operation on all questions concerning standardization in the electri

23、cal and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, gove

24、rnmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisi

25、ons or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3) The documents produced have the form of recommendations for i

26、nternational use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4) In order to promote international unification, IEC National Committees undertake to apply IEC International Standards

27、transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5) The IEC provides no marking procedure to indicate its approval and cannot be

28、 rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. The IEC shall not be held responsible for identifying any or all such

29、 patent rights. International Standard IEC 61280-2-9 has been prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical committee 86: Fibre optics The text of this standard is based on the following documents: FDIS Report on voting 86C/457/FDIS 86C/479/RVD Full informati

30、on on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 3. Annex A is for information only. The committee has decided that the contents of this publication

31、will remain unchanged until 2008. At this date, the publication will be reconfirmed; withdrawn; 61280-2-9/CDV adopted as TIA-455-236 iii replaced by a revised edition, or amended. IEC 61280-2 consists of the following parts, under the general title Fibre optic communication subsystem test procedures

32、1): Part 2-1: Test procedures for digital systems Receiver sensitivity and overload measurement Part 2-2: Test procedures for digital systems Optical eye pattern, waveform, and extinction ratio Part 2-4: Test procedures for digital systems Bit-rate tolerance measurement Part 2-5: Test procedures for

33、 digital systems Jitter transfer function measurement Part 2-9: Digital systems Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems _ 1)The general title of the IEC 61280 series has changed. Parts 2-1, 2-2, 2-4 and 2-5 were published under the general title Fi

34、bre optic communication subsystem basic test procedures 61280-2-9/CDV adopted as TIA-455-236 ivINTRODUCTION At the optical interfaces within wavelength-division multiplexed (WDM) networks, it is desirable to measure parameters that provide information about the integrity of the physical plant. Such

35、parameters are necessary to monitor network performance as an integral part of network management. They are also necessary to assure proper system operation for installation and maintenance of the network. Ideally, such parameters would directly correspond to the bit error ratio (BER) of each channe

36、l of a multichannel carrier at the particular optical interface. Related parameters such as Q-factor or those calculated from optical eye patterns would provide similar information, that is, they would correlate to the channel BER. However, it is difficult to obtain access to these parameters at a m

37、ultichannel interface point. It is necessary to demultiplex the potentially large number of channels and make BER, Q-factor, or eye-diagram measurements on a per-channel basis. In contrast, useful information about the optical properties of the multichannel carrier is readily obtained by measuring t

38、he optical spectrum. Wavelength-resolved signal and noise levels provide information on signal level, signal wavelength, and amplified spontaneous emission (ASE) for each channel. Spectral information, however, does not show signal degradation due to waveshape impairments resulting from polarization

39、-mode dispersion (PMD), and chromatic dispersion. Also, intersymbol interface and time jitter are not revealed from an optical signal to noise ratio (OSNR) measurement. In spite of these limitations, OSNR is listed as an interface parameter in ITU-T Recommendation G.692; “Optical interfaces for mult

40、ichannel systems with optical amplifiers.”12)OSNR is also listed in ITU-T Recommendation G.959.1, “Optical transport network physical layer interfaces.” _ 2)Figures in brackets refer to the bibliography. 61280-2-9/CDV adopted as TIA-455-236 1FIBRE OPTIC COMMUNICATION SUBSYSTEM TEST PROCEDURES Part 2

41、-9: Digital systems Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems 1 Scope This part of IEC 61280 provides a parameter definition and a test method for obtaining optical signal-to-noise ratio (OSNR) using apparatus that measures the optical spectrum at a

42、multichannel interface. Because noise measurement is made on an optical spectrum analyzer, the measured noise does not include source relative intensity noise (RIN) or receiver noise. Three implementations for an optical spectrum analyser (OSA) are discussed: a diffraction-grating-based OSA, a Miche

43、lson interferometer-based OSA, and a Fabry-Perot-based OSA. Performance characteristics of the OSA that affect OSNR measurement accuracy are provided. A typical optical spectrum at a multichannel interface is shown in figure 1. Important characteristics are as follows. The channels are placed nomina

44、lly on the grid defined by ITU Recommendation G.694.1. Individual channels may be non-existent because it is a network designed with optical add/drop demultiplexers or because particular channels are out of service. Both channel power and noise power are a function of wavelength. For calculating OSN

45、R, the most appropriate noise power value is that at the channel wavelength. However, with a direct spectral measurement, the noise power at the channel wavelength is included in signal power and is difficult to extract. An estimate of the channel noise power can be made by interpolating the noise p

46、ower value between channels. 61280-2-9/CDV adopted as TIA-455-236 2WavelengthOptical powerMissing channelsChannels onthe ITU gridNoiseIEC 2407/02Figure 1 A typical optical spectrum at an optical interface in a multichannel transmission system 2 Normative references None. 3 Definitions 3.1 optical si

47、gnal-to-noise ratio (OSNR) ratio in decibels, from the optical spectrum, defined by the equation rmLog10Log10OSNRBBNPii+= dB (1) where: Piis the optical signal power in watts at the i-th channel. Br is the reference optical bandwidth. Niis the interpolated value of noise power in watts measured in n

48、oise equivalent bandwidth, Bm, 2)()(i +=iiNNN (2) at the i-th channel; i is the wavelength of the I-th channel; is the interpolation offset equal to or less than one-half the ITU grid spacing. 61280-2-9/CDV adopted as TIA-455-236 3(The units for Bm andBrmay be in frequency or wavelength but must be

49、consistent.) Typically, the reference optical bandwidth is 0,1 nm. See figure 2. NOTE The noise equivalent bandwidth of a filter is such that it would pass the same total noise power as a rectangular passband that has the same area as the actual filter, and the height of which is the same as the height of the actual filter at its center wavelength. N(i )Ni N(i+ )Pi+ NiIEC 2408/02Figure 2 The OSNR for each channel is derived from direct measurements of the optical spectrum 4 Apparatus The req