IEC 61300-3-12:1997 pdf download.Fibre optic interconnecting devices and passive components – Basic test and measurement procedures
1 General
1 .1 Scope and object
This part of IEC 1 300 describes the test to determine the dependence of attenuation of single-
mode fibre optic components to changes in the state of the polarization of the input light. The
value given by this test is the maximum variation in loss over all states of polarization of the
launch light into the component under test (DUT).
1 .2 Normative reference
The following normative document contains provisions which, through reference in this text,
constitute provisions of this part of IEC 1 300. At the time of publication, the edition indicated
was valid. All normative documents are subject to revision, and parties to agreements based
on this part of IEC 1 300 are encouraged to investigate the possibility of applying the most
recent edition of the normative document indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 1 300-3-2: 1 995, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-2: Examinations and measurements – Polarization
dependence of a single-mode fibre optic device
2 General description
This test differs from the methods described in IEC 1 300-3-2 and it constitutes an alternative
method. These other test procedures are based on manipulation of the state of polarization of
light either continuously or in small incremental adjustments in order to measure maxima and
minima of the attenuation of transmitted light. This test method involves the measurement of
the behaviour of a DUT when illuminated by a small set of well-defined states of polarization of
input light. These measurements are followed by a matrix calculation to determine the polarization dependence of loss (PDL) of the DUT.
This procedure can be applied to any single-mode passive component. It determines the total
range of attenuation due to changes in polarization of the launch light.
Generally, there are two matrix formalisms to describe and quantify the polarization behaviour
of light in fibre optic systems, that based on the Mueller matrix and that based on the Jones
matrix.
The Mueller matrix formalism entails an optical power representation of the performance of
components. This matrix is a square 1 6 element matrix. Here, the state of polarization of light
is described as a 4 element Stokes vector. The Stokes vector of the incident light multiplied by
the Mueller matrix of the DUT gives the Stokes vector of the output light, and this output light
may be from transmission, reflection or scattering. In the determination of PDL of a component
using Mueller matrices, it is normally not necessary to determine the full Mueller matrix but
rather only the first row of the matrix, which provides complete information on light intensity but
not on the resultant state of polarization.
On the other hand, the Jones matrix formalism entails an electric field representation of the polarization behaviour of components. The Jones matrix is a square four-element matrix and is used with incident light which has been described as a Jones vector. The Jones vector of the incident light multiplied by the Jones matrix of the DUT gives a Jones vector for the output light, which may be from transmission, reflection or scattering. For the determination of PDL, it can be shown that the Mueller and Jones representations are mathematically equivalent for fully polarized light, but for partially polarized light only the Mueller representation is applicable. The test procedure described here uses Mueller mathematics to determine PDL. Several methods to determine PDL using matrix mathematics can be defined. In this test procedure, one example approach is defined. Here, the DUT is illuminated sequentially by a set of four independent polarization states and the corresponding attenuations of the DUT are measured. The information so derived is sufficient to determine the first row of the Mueller matrix of the DUT and then its PDL can be precisely calculated.
IEC 61300-3-12:1997 pdf download
