1、 International Telecommunication Union ITU-T G.693TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (11/2009) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Transmission media and optical systems characteristics Characteristics of optical systems Optical interfaces for intra-of
2、fice systems Recommendation ITU-T G.693 ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS G.100G.199 GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIER-TRANSMISSION SYSTEMS G.200G.299 INDIVIDUAL CHARACTERI
3、STICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES G.300G.399 GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES G.400G.449 COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY G.450G.499 TRANSMISS
4、ION MEDIA AND OPTICAL SYSTEMS CHARACTERISTICS G.600G.699 General G.600G.609 Symmetric cable pairs G.610G.619 Land coaxial cable pairs G.620G.629 Submarine cables G.630G.639 Free space optical systems G.640G.649 Optical fibre cables G.650G.659 Characteristics of optical components and subsystems G.66
5、0G.679 Characteristics of optical systems G.680G.699DIGITAL TERMINAL EQUIPMENTS G.700G.799 DIGITAL NETWORKS G.800G.899 DIGITAL SECTIONS AND DIGITAL LINE SYSTEM G.900G.999 MULTIMEDIA QUALITY OF SERVICE AND PERFORMANCE GENERIC AND USER-RELATED ASPECTS G.1000G.1999 TRANSMISSION MEDIA CHARACTERISTICS G.
6、6000G.6999 DATA OVER TRANSPORT GENERIC ASPECTS G.7000G.7999 PACKET OVER TRANSPORT ASPECTS G.8000G.8999 ACCESS NETWORKS G.9000G.9999 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T G.693 (11/2009) i Recommendation ITU-T G.693 Optical interfaces for intra-office syst
7、ems Summary Recommendation ITU-T G.693 provides parameters and values for optical interfaces of single channel intra-office systems of nominal 10 Gbit/s and 40 Gbit/s aggregate bit rate. Applications are specified with target distances of 0.6 and 2 km and various loss budgets for ITU-T G.652, ITU-T
8、G.653 and ITU-T G.655 fibres. The latest version makes use of improved specifications for chromatic dispersion of these fibre types. Source Recommendation ITU-T G.693 was approved on 13 November 2009 by ITU-T Study Group 15 (2009-2012) under Recommendation ITU-T A.8 procedures. ii Rec. ITU-T G.693 (
9、11/2009) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible
10、 for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T s
11、tudy groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative bas
12、is with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory
13、 provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use
14、of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no p
15、osition concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, pr
16、otected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2010 All rights reserved. No par
17、t of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T G.693 (11/2009) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Terms and definitions . 1 3.1 Terms defined elsewhere 1 4 Abbreviations and acronyms 2 5 Classification of optical i
18、nterfaces 2 5.1 Applications 2 5.2 Nomenclature . 3 6 Parameter definitions 6 6.1 System operating wavelength range . 6 6.2 Transmitter . 6 6.3 Optical path 8 6.4 Receiver 10 7 Optical parameter values 11 8 Optical engineering approach . 20 Appendix I Optical crosstalk impact . 21 Appendix II Exampl
19、es of system configurations using applications defined in this Recommendation 22 Appendix III Differences in parameter values between ITU-T G.693 application codes and equivalent ITU-T G.691 and ITU-T G.959.1 codes 23 Rec. ITU-T G.693 (11/2009) 1Recommendation ITU-T G.693 Optical interfaces for intr
20、a-office systems 1 Scope The purpose of this Recommendation is to provide optical interface specifications to enable transverse (multivendor) compatibility of nominal 10 Gbit/s and 40 Gbit/s aggregate bit rate intra-office systems for link distances up to 2 km. This Recommendation defines links usin
21、g optical fibres according to ITU-T G.652, ITU-T G.653 and ITU-T G.655. Parallel interface specifications may be included in future revisions. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this
22、 Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other
23、references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T G.652 Recommendation ITU-T G.652 (2005), Characteristics of a
24、 single-mode optical fibre and cable. ITU-T G.653 Recommendation ITU-T G.653 (2006), Characteristics of a dispersion-shifted single-mode optical fibre and cable. ITU-T G.655 Recommendation ITU-T G.655 (2006), Characteristics of a non-zero dispersion-shifted single-mode optical fibre and cable. ITU-T
25、 G.691 Recommendation ITU-T G.691 (2006), Optical interfaces for single channel STM-64 and other SDH systems with optical amplifiers. ITU-T G.709 Recommendation ITU-T G.709/Y.1331 (2003), Interfaces for the Optical Transport Network (OTN). ITU-T G.957 Recommendation ITU-T G.957 (2006), Optical inter
26、faces for equipments and systems relating to the synchronous digital hierarchy. ITU-T G.959.1 Recommendation ITU-T G.959.1 (2008), Optical transport network physical layer interfaces. ITU-T G.8251 Recommendation ITU-T G.8251 (2001), The control of jitter and wander within the optical transport netwo
27、rk (OTN). 3 Terms and definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 completely standardized OTUk (OTUk): ITU-T G.709. 3.1.2 optical tributary signal class NRZ 10G (NRZ 10G): ITU-T G.959.1. 3.1.3 optical tributary signal class NRZ 40G (N
28、RZ 40G): ITU-T G.959.1. Rec. ITU-T G.693 (11/2009) 24 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: ASE Amplified Spontaneous Emission BER Bit Error Ratio DGD Differential Group Delay EX Extinction ratio FEC Forward Error Correction ffs for further stu
29、dy MLM Multi-Longitudinal Mode MPI Main Path Interface MPN Mode Partition Noise NA Not Applicable NRZ Non-Return to Zero ORL Optical Return Loss PMD Polarization Mode Dispersion PRBS Pseudo-Random Binary Sequence RMS Root Mean Square SDH Synchronous Digital Hierarchy SLM Single-Longitudinal Mode SMS
30、R Side Mode Suppression Ratio VSR Very Short Reach WDM Wavelength Division Multiplex 5 Classification of optical interfaces 5.1 Applications This Recommendation defines optical interfaces for single-channel intra-office systems for link distances up to 2 km. These interface descriptions are intended
31、 to enable transverse (multivendor) compatibility. Figure 1 illustrates a system of the type considered in this Recommendation, and shows the reference points used to specify optical interface parameters. NOTE The main optical path includes fibre and connectors, and may include other passive optical
32、devices such as photonic cross-connects.Transmitter ReceiverMain optical pathMPI-S MPI-RFigure 1 Optical link example showing reference points defined in this Recommendation Rec. ITU-T G.693 (11/2009) 3Parameters are specified for the transmitter at point MPI-S, for the receiver at point MPI-R, and
33、for the main optical path between points MPI-S and MPI-R. The main optical path for systems described in this Recommendation may include passive optical devices, e.g., photonic cross-connects, which introduce significant attenuation. Thus, values of maximum attenuation may not be inferred from the t
34、arget distances of applications. In this Recommendation, attenuation categories are used to distinguish among applications which have the same source and fibre type and target distance, and are intended for the same signal class, but have different values of maximum attenuation. Four attenuation cat
35、egories are defined with maximum attenuation values of 4 dB, 6 dB, 12 dB and 16 dB, respectively. A fifth category is defined (with a maximum attenuation value for further study) in case the maximum attenuation value provided by the H category is too low to cover all applications. Appendix II shows
36、examples of system configurations using applications defined in this Recommendation. 5.2 Nomenclature Applications in this Recommendation are distinguished by application codes. Each code indicates the target distance, highest class of optical tributary signal supported, attenuation category and sou
37、rce and fibre type of the associated application. Application codes have the following structure: W-yAz where: W indicates target distance: VSR600, VSR1000 and VSR2000, indicating target distances of 0.6 km, 1 km and 2 km, respectively. y indicates highest class of optical tributary signal supported
38、: 2 indicating NRZ 10G. 3 indicating NRZ 40G. A indicates attenuation category: R indicating maximum attenuation of 4 dB. L indicating maximum attenuation of 6 dB. M indicating maximum attenuation of 12 dB. H indicating maximum attenuation of 16 dB. V indicating maximum attenuation of ffs dB. The V
39、category has been introduced in case the maximum attenuation value provided by the H category is too low to cover all applications. z indicates the source and fibre type: 1 indicating nominally 1310 nm sources on ITU-T G.652 fibre; 2 indicating nominally 1550 nm sources on ITU-T G.652 fibre; 3 indic
40、ating nominally 1550 nm sources on ITU-T G.653 fibre; 5 indicating nominally 1550 nm sources on ITU-T G.655 fibre. For some application codes, the suffix F is added at the end of the code, to indicate that this application requires FEC bytes as specified in ITU-T G.709 to be transmitted. Rec. ITU-T
41、G.693 (11/2009) 4Tables 1 and 2 summarize the application codes described in this Recommendation. Table 1 Classification of optical interfaces with 0.6 km target distance Target distancea)0.6 km Attenuation categorya)R M Source nominal wavelength (nm) 1310 1310 1550 Type of fibre ITU-T G.652 ITU-T G
42、.652 ITU-T G.652 ITU-T G.653 ITU-T G.655 Application codes for optical tributary signal class NRZ 10G VSR600-2R1 VSR600-2M1 VSR600-2M2 VSR600-2M3 VSR600-2M5 Application codes for optical tributary signal class NRZ 40G a)Target distances and attenuation categories are for classification and not for s
43、pecification. 5 Rec. ITU-T G.693 (11/2009) Table 2 Classification of optical interfaces with 2 km target distance Target distancea)2 kmAttenuation categorya)R L M H Source nominal wavelength (nm) 1310 1550 1310 1550 1310 1550 1550 Type of fibre ITU-T G.652 ITU-T G.652 ITU-T G.653 ITU-T G.655 ITU-T G
44、.652 ITU-T G.652ITU-T G.653ITU-T G.655 ITU-T G.652 ITU-T G.652ITU-T G.653ITU-T G.655 ITU-T G.652 ITU-T G.653 ITU-T G.655 Application codes for optical tributary signal class NRZ 10G VSR2000-2R1 VSR2000-2L1F VSR2000-2L2VSR2000-2L3VSR2000-2L5 Application codes for optical tributary signal class NRZ 40
45、G VSR2000-3R1 VSR2000-3R1F VSR2000-3R2 VSR2000-3R3 VSR2000-3R5 VSR2000-3R2FVSR2000-3R3FVSR2000-3R5F VSR2000-3L1F VSR2000-3L2FVSR2000-3L3FVSR2000-3L5FVSR2000-3M1 VSR2000-3M2VSR2000-3M3VSR2000-3M5VSR2000-3H2 VSR2000-3H3 VSR2000-3H5 a)Target distances and attenuation categories are for classification a
46、nd not for specification. Rec. ITU-T G.693 (11/2009) 66 Parameter definitions All parameter values are worst-case values, assumed to be met over the range of standard operating conditions (i.e., temperature and humidity ranges), and they include ageing effects. The parameters are specified relative
47、to an optical section design objective of a bit error ratio (BER) not worse than 1012for any combination of parameters within the ranges given in the tables for each specified system. Except for application codes requiring FEC bytes to be transmitted (i.e., having a code with a suffix of F), achievi
48、ng this BER objective shall not require the application of forward error correction. In the case of application codes requiring FEC bytes to be transmitted, the BER is required to be met only after the correction (if used) has been applied. The optical line coding used for system interfaces in this
49、Recommendation is binary non-return to zero (NRZ). 6.1 System operating wavelength range The operating wavelength range is the maximum allowable range for the source wavelength. Within this range, the source wavelength can be selected for different fibre-related impairments. The receiver must have the minimum operating wavelength range that corresponds to the maximum allowable range for the source wavelength. The operating wavelength range of fibre-optic transmission sy
