Phase Shift Method; Standards And L0 For Different Types Of Fiber - Viavi 8100 V2 Series User Manual

Principle of measurement of Chromatic Dispersion (CD ODM) using phase shift method
Principle of measurement of Chromatic Dispersion
(CD ODM) using phase shift method
The Phase shift method
A modulated broadband light is sent over the Fiber Under Test. The phase of the test
signal is compared to the phase of the reference signal. The measured value is the
group delay, corresponding to a wavelength interval between the reference phase and
the test wavelength phase. It is measured in the frequency domain, by detecting,
recording and processing the phase shift of The modulated signals. The fibre chromatic
dispersion is derived from the measurement of the relative group delay using an approx-
imation formula.
Figure 6 CD ODM measurement using phase shift method
Standards and λ0 for different types of fiber
Fiber
Standard ITU/Y
Standard IEC
Standard TIA/EIA Iva
Approximate λ
0 .
non-offset
dispersion
ITU-T G.652
IEC 60793-1-1
type B1
1310 nm
User Manual
Chapter 1 Principles of measurement
offset dispersion
ITU-T G.653
IEC 60793-1-1
type B2
IVb
1550 nm
78000010220 Rev. 024
non-zero or
homogeneous offset
dispersion
ITU-T G.655
IEC 60793-1-1
type B3
IVb
1500 nm or indefinite
9