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1、- STD-JIS C 5920-ENGL 1777 Y933b08 0551b5L TL7 W J IS JAPANESE I NDU STR IAL STANDARD Translated and Published by Japanese Standards Association JIS C 592O:i9g7 General rules of optical attenuators b ICs 33.180.20 Descriptors : fibre optics, infrared radiation, optical instruments, attenuators, spec
2、ifications, optical communication systems, circuits Reference number : JIS C 5920 : 1997 (E) 7s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking per
3、mitted without license from IHS -,-,- C 5920 :1997 Foreword This translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial
4、 Standardization Law. Consequently JIS C 5920:1988 is replaced with JIS C 5920:1997. Attention is drawn to the possibility that some parts of this Standard may conflict with a patent right, application for a patent after opening to the public, utility model right or application for registration of u
5、tility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registrat
6、ion of utility model after opening to the public which have the said technical properties. Date of Establishment: 1988-04-01 Date of Revision: 1997-11-20 Date of Public Notice in Official Gazette: 1997-11-20 Investigated by: Japanese Industrial Standards Committee Divisional Council on Electronics J
7、IS C 5920:1997, First English edition published in 1998-10 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. i O JSA 1998 All rights reser
8、ved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan Copyright Japanese Standards Association Provided
9、 by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS C 6920 : 1997 General rules of optical attenuators Introduction This Japan
10、ese Industrial Standard is prepared based on IEC 60869-1, Fibre optic attenuators-Part I : Generic specification published as the second edition in 1994, without modification of technical contents but the provision (for symbols de- noting attenuation system) not specified in the corresponding Intern
11、ational Standard is added. The above-mentioned IEC Standard number belongs to a new number series put in effort on and after January 1, 1997. As for Standards published before the above date, the numbers have been altered by adding 60000 to the original numbers. This is only change in the numbers, b
12、ut the content remains unchanged. 1 Scope This Japanese Industrial Standard covers general rules of optical attenu- ators for use in fiber optic transmission utilizing silica glass optical fibers, and specifies general common matters such as terms, classification, symbols, construction and per- form
13、ances. Remarks : The International Standard corresponding to this Standard is given be- low. IEC 60869-1 : 1994 Fibre optic attenuators-Part I : Generic Specifica- tion 2 Normative references The following Standards contain provisions which, through reference in this Standard, constitute provisions
14、of this Standard. The most recent edi- tions of the Standards indicated below shall be applied. JIS C 5900 JIS C 5901 JIS C 5970 JIS C 5971 JIS C 5972 JIS C 5973 JIS C 5978 JIS C 5979 JIS C 5981 JIS Z 0150 General rules ofpassive devices for fiber optic transmission Test methods ofpassive devices fo
15、r fiber optic transmission Fol Type connectors for optical fiber cables FOZ Type connectors for optical fiber cables FU3 Type connectors for optical fiber cables F04 Qpe connectors for optical fiber cables FO9 Type connectors for optical fiber cables FIO Type connectors for optical fiber cables F12
16、Type connectors for optical fiber ribbons Pictorial markings for handling ofgoods 3 Definitions For the purpose of this Standard, the following principal definitions apply : a) optical attenuator As specified in 2 of JIS C 6900. Copyright Japanese Standards Association Provided by IHS under license
17、with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS C 5920-ENGL 1777 4933b08 0551b5Li 728 I 2 C 5920 : 1997 fixed optical attenuator An optical attenuator having such a mech
18、anism that the attenuation of optical power is filed at a constant quantity. variable optical attenuator An optical attenuator in which the attenuation of opti- cal power can be set at a prescribed quantity by means of a variable mechanism ca- pable of being externally operated. discrete step variab
19、le optical attenuator A variable optical attenuator which can change the optical power stepwise. continuously variable optical attenuator A variable optical attenuator which can change the optical power continuously. absorption type optical attenuator An optical attenuator in which the incident ligh
20、t is attenuated due to absorption of light by an optical absorbent. reflection type optical attenuator An optical attenuator in which the incident light is attenuated due to reflection of light by a reflecting material. radiation type optical attenuator An optical attenuator in which the light is at
21、- tenuated due to change of coupling efficiency between inlet terminal and outlet terminal. attenuation As specified in 2 of JIS C 5900. nominal attenuation max. attenuation The max. attenuation of optical power that can be set by the variable mechanism of a variable optical attenuator. min. attenua
22、tion The min. attenuation of optical power that can be set by the variable mechanism of a variable optical attenuator. residual attenuation When the min. nominal attenuation of a variable attenuator is O dB, this means the optical power attenuation at the position or state of the O dB marking. rever
23、se attenuation The attenuation when the light is introduced in the direction reverse to the indication of an optical attenuator whose inlet and outlet parts are assigned. tolerance on attenuation The difference between the permissible limit of attenua- tion and the nominal attenuation. variable rang
24、e of attenuation The attenuation range from the max. attenuation to the min. attenuation in a variable optical attenuator. min. value of variable step The min. value of variable attenuation in a discrete step variable optical attenuator. reproducibility of attenuation The reproducibility at change-o
25、ver of the attenua- tion in a variable attenuator. return loss As specified in 2 of JIS C 5900. nominal wavelength As specified in 2 of JIS C 5900. Nominal value of attenuation of an optical attenuator. J Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Emp
26、loyees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS C 5720-ENGL 1997 4733b08 055Lb55 bb4 D C I Discrete step variable optical attenuator Continuously variable optical attenuator 3 C 5920 1997 u) us
27、able wavelength band As specified in 2 of JIS C 6900. v) polarization dependence As specified in 2 of JIS C 6900. w) polarization dispersion As specified in 2 of JIS C 6900. x) max. entry optical power As specified in 2 of JIS C 6900. 4 Type designation and symbols 4.1 ators shall be expressed as st
28、ated below, based on 3 of JIS C 6900. Structure of type designation Classification and symbolization of optical attenu- Symbol denoting passive device foi fiber optic trans- I mission 4.2.1 Examples: L 4.2.6 Examples: O0 T Symbol denoting optical attenu- ator c 4.2.2 AT r Symbol denoting working opt
29、ical fiber cord L 4.2.7 o1 T Symbol denoting type of optical at tenuator c I Symbol denoting attenuation sys- em 4.2.3 4.2.4 F ab 4.2.8 SMA 4.2.9 131 Symbol denoting connection style I 4.2.6 A pecification 4.2.10 4.2 Symbols 4.2.1 Symbol denoting passive device for fiber optic transmission Passive d
30、evices for fiber optic transmission are denoted by an English capital letter L. 4.2.2 capital letters AT. Symbol denoting optical attenuator Optical attenuators are denoted by English 4.2.3 Symbols denoting types of optical attenuator Symbols denoting types of optical attenuator shall be as stated i
31、n Table 1. Table 1 Symbols denoting types of optical attenuator I Symbol I Type of optical attenuator I I F I Fixed optical. attenuator I I I I Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/20
32、07 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS C 5720-ENGL 1797 g733b08 055Lb5b 5T0 I 4 C 5920 : 1997 4.2.4 Symbols denoting attenuation systems Symbols denoting attenuation systems shall be as stated in Table 2. Table 2 Symbols denoting attenuation sys
33、tems Symbol ab Attenuation system Absorption type optical attenuator rf Reflection type optical attenuator rd Radiation type optical attenuator - 4.2.5 Symbols denoting connection style as stated in Table 3. Symbols denoting connection styles shall be Symbol A B Connection style Optical attenuators
34、in which all terminals have pigtail type connectors Optical attenuators in which all terminals have plug type connectors C D 4.2.6 Symbols denoting applied optical connectors Symbols denoting applied optical connectors shall be as stated in Table 4. Optical attenuators in which all terminals have re
35、ceptacle type connectors Optical attenuators in which connection styles of terminals are combined Table 4 Symbol O 0 o1 02 03 04 o9 10 12 99 F01 type optical connector F02 type optical connector Symbols denoting applicable optical connectors Specified in JIS C 6970 Specified in JIS C 5971 Applicable
36、 optical connector Pigtail _ F04 type optical connector F09 type optical connector Specified in JIS C 6973 Specified in JIS C 5978 F03 type optical connector I Specified in JIS C 5972 I _ _ F12 type optical connector Specified in JIS C 6981 F10 type optical connector I Specified in JIS C 6979 I Copy
37、right Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- STD.JIS C 5920-ENGL 1777 m 4733bO 055Lb57 437 m Symbol O0 O 1
38、06 I- Working optical fiber cord No optical fiber cord is used Optical fiber cord with tensile strength member of: sheath diameter : (2.8+0.3)mm jacketed optical fiber diameter : (0.9+O.l)mm Optical fiber cord with tensile strength member of : sheath diameter : (2.0f0.2)mm 5 C 5920 1997 . 1 4.2.7 ca
39、l fiber cords shall be as stated in Table 5. Symbols denoting working optical fiber cords Symbols denoting working opti- jacketed optical fiber diameter : (0.9fO.l)mm Jacketed optical fiber of : diameter : (0.9fO.l)mm Jacketed optical fiber of : Il 99 diameter : (0.25fO.l)mm Others Symbol X SI 4.2.8
40、 Symbols denoting working optical fibers bers shall be as stated in Table 6. Symbols denoting working optical fi- Working optical fiber No optical fiber is used Multimode step index optical fiber GI SMA SMB SMC SPM N E a I I Y ultimode quasi step index optical fiber I Multimode graded index optical
41、fiber Single-mode 1 310 nm zero-dispersion optical fiber Single-mode 1 550 nm zero-dispersion optical fiber Single-mode dispersion, flat type optical fiber Polarization plane maintaining optical fiber Other optical fibers 4.2.9 Symbols denoting nominal wavelengths Symbols denoting the nominal wave-
42、length shall consist of the numerals of three digits as exemplified below. Examples : Symbol denoting nominal wavelength 850 nm shall be numerals 085. Symbol denoting nominal wavelength 1310 nm shall be numerals 131. Symbol denoting nominal wavelength 1550 nm shall be numerals 155. 4.2.10 Identifica
43、tion symbols to be specified in detail specification These symbols shall be specified in the detail specification as needed. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo r
44、eproduction or networking permitted without license from IHS -,-,- STD-JIS C 5920-ENGL 1997 m 4733bD 055Lb5 373 m 6 C 5920 : 1997 5 cal symbols shown in Table 7 shall be used. Graphical symbols For graphical symbolization of optical attenuators, the graphi- Table 7 Graphical symbols of optical atten
45、uators Function of optical Plug type at tenuator Fixed optical attenuator Variable optical attenuator I U Receptacle type I Pig tail type I U 6 Appearance and construction 6.1 Appearance When the appearance is checked visually, there shall be no abnor- malities such as remarkable scratch and dirt. 6
46、.2 Construction The construction of optical attenuator shall follow the provisions of the detail specification. 7 Performances The performances shall be expressed by the items stated below and be as specified in the detail specification. Attenuation and usable wavelength band Variable attenuation ra
47、nge Residual attenuation Reverse attenuation Return loss Reproducibility of attenuation Polarization dependence Polarization dispersion Max. entry optical power Mechanical performances Performances referring to environment and endurance 8 Test methods The test methods of optical attenuators for use
48、in optical transmis- sion utilizing silica glass optical fibers shall be as specified in JIS C 5901. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 20:47:56 MDTNo reproduction or networking permitted without license from IHS -,-,- I I. Passive devices for fiber optic transmission Optical attenuator 7 C 5920 1997 L AT 9 Markings Type Attenuation system 9.1 Markings on products The following items shall be marked on the surfa