YD/T 2341.1-2011 English PDF (YDT2341.1-2011)

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YD/T 2341.1-2011: Field-mountable optical fiber connectors. Part 1: Mechanical type
YD/T 2341.1-2011
YD
COMMUNICATION INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 33.180.20
M 33
Field-mountable optical fiber connectors -
Part 1: Mechanical type
ISSUED ON: DECEMBER 20, 2011
IMPLEMENTED ON: DECEMBER 20, 2011
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Requirements ... 6 
5 Measurement and test ... 12 
6 Quality assessment procedures ... 24 
7 Inspection rules ... 29 
8 Marking, packaging, transportation, storage ... 30 
Field-mountable optical fiber connectors - Part 1:
Mechanical type
1 Scope
This Part specifies the requirements, measurement and testing, quality
assessment procedures, inspection rules, markings, packaging, transportation,
storage of mechanical type field-mountable optical fiber connectors (also known
as mechanical optical fiber quick connectors, hereinafter referred to as
mechanical field-mountable connectors).
This Part applies to mechanical type field-mountable fiber optical connectors.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) is applicable to this standard.
GB/T 2421.1-2008 Environmental testing for electric and electronic products
- General and guidance
GB/T 2828.1-2003 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 5169.16-2008 Fire hazard testing for electric and electronic products -
Part 16: Test flames - 50W horizontal and vertical flame test methods
YD/T 1272.1-2003 Optical fiber connector - Part 1: type LC
YD/T 1272.3-2005 Optical fiber connector - Part 3: Type SC connector family
YD/T 1272.4-2007 Optical fiber connector - Part 4: Type FC
YD/T 2152-2010 The requirement of reliability and test methods for optical
fiber connectors
SJ/T 11363-2006 Requirements for concentration limits for certain
hazardous substances in electronic information products
SJ/T 11364-2006 Marking for control of pollution caused by electronic
a) Plug type;
- FC type plug;
- SC type plug;
- LC type plug.
b) Plug receptacle type:
- FC type plug receptacle;
- SC type plug receptacle;
- LC type plug receptacle.
4.1.1.2 Classification by the end face of ferrule
According to the shape of the end face of the ferrule, it can be divided into the
following two types:
a) PC type or UPC type;
b) APC type.
Note: The physical structure of the UPC (Ultral PC [Translator note: should be Ultra])
type pin is the same as that of the PC type, however, the return loss is higher than
that of the PC type.
4.1.1.3 Classification by applicable optical fiber or cable type
According to the matching optical fiber or optical cable, it can be divided into
the following two types:
a) Optical fiber type: It is a field-mountable optical fiber connector, which is
terminated on 250 µm pre-coated optical fiber or 900 µm tight-sleeved
optical fiber;
b) Optical cable type: It is a field-mountable optical fiber connector, which is
terminated on the cable sheath. Optical cable types include butterfly drop
cables, round single-core optical cables or other optical cables.
4.1.1.4 Classification by the number of connection points
According to the number of connection points, it can be divided into the
following two types:
a) Single jointed connector assembly;
of SJ/T 11363-2006. The refractive index of the materials, which match the
refractive index used internally, needs to be close to that of the fiber core. The
material shall be stable and reliable for a long time.
4.4 Appearance, structure, end face requirements of ferrule
4.4.1 Appearance and structure requirements
The assembled field-mountable optical fiber connector shall be smooth, clean,
free of oil and burrs, free of scars and cracks, bright in color, sound in
consistency. All parts and components shall be flatly assembled. The insertion
and pull-out of the adapter shall be smooth and easy; the clamping is tight.
4.4.2 Requirements for the end face of ferrule
The end face of the ferrule of the field-mountable optical fiber connector plug
shall not have obvious oil stains and dirt. There is no obvious impurity, crack,
scratch, in the ceramic part. When observing the end face of the central optical
fiber, under a 200x microscope, it is required that there be no obvious white
spot (chip), black spot (dirt), shadow (internal crack). The scratches cannot
pass through the light-transmitting part of the optical fiber. When observed with
a light passer, the emitted light spot is normal.
The number of connectors is multi-point type. The geometrical size
requirements of the ferrule's end face of the mechanical field-mountable
connector, of the plug type connector structure, shall meet the requirements of
clause 5.3.2.2 of YD/T 2152-2010.
4.5 Field assembly requirements for mechanical field-mountable
connectors
4.5.1 Average assembly time
The average assembly time of mechanical field-mountable connectors refers to
the total time -- which is required for several samples, FROM stripping the fiber
or cable TO the completion of assembly, divided by the number of qualified
samples -- thereby obtaining the average assembly time, which is required for
assembly of a single device. For optical fiber mechanical field-mountable
connectors, the average assembly time shall be within 4 min. For optical cable
mechanical field-mountable connectors, the average assembly time shall be
within 5 min.
4.5.2 Success rate of one-time assembly
Within the assembly time, which is required by clause 4.5.1, if the number of
samples for the assembly success rate of mechanical field-mountable
connectors (insertion loss and return loss shall meet the requirements of Table
5.1.2.2 Measurement and test light source for multi-mode mechanical
field-mountable connector
The LED light source shall be used, when measuring the multi-mode
mechanical field-mountable connector. The peak point wavelength is 850
nm/1300 nm. Because the mode distribution changes of the measurement
system, which is caused by fiber disturbance, will affect the measurement
results, it shall use the LED or other incoherent light sources. Meanwhile, it shall
use a mode scrambler, in the pigtail, to remove undesirable instantaneous high-
order modes. The multi-mode fiber scrambler consists of optical fiber, which
tightly winds 5 rounds on a smooth mandrel. The diameter of the mandrel is
based on the criterion that, the instantaneous high-order mode can be
attenuated, to achieve a steady-state mode. Typical core diameter is as follows:
The 50 µm core diameter fiber has a core diameter of 18 mm; the 62.5 µm core
diameter fiber has a core diameter of 20 mm (if optical cable is used, the core
diameter minus the cable diameter correspondingly).
5.1.3 Standard connector
When testing the optical performance of FC-type mechanical field-mountable
connectors, the standard connectors used shall meet the requirements of
clause 4.3 of YD/T 1272.4-2007. When testing the optical performance of SC-
type mechanical field-mountable connectors, the standard connectors used <...