TIA/EIA TSB-62-23:2001

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ITM-23 Measurement of the Nonlinear Coefficient of Single-Mode Fibers

Published By	Publication Date	Number of Pages
TIA	2001	30

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Description

The nonlinear coefficient (nLc) is the ratio of the Kerr
nonlinear refractive index, n₂, and the effective area,
A_eff (see FOTP-132), as:

The nonlinear coefficient is related to the following nonlinear
optical distortion effects as a combined parameter:

Self-phase modulation (SPM)

Cross-phase modulation (XPM)

Four-wave mixing (FWM)

Other fiber attributes, such as chromatic dispersion, also
influence the transmission.

Two methods are given, with details specific to each in
normative annexes. They are:

Method A Continuous-wave dual-frequency

Method B Pulsed single-frequency

Both methods require injecting very high powers (5 dBm or more)
into the fiber, measurement of this power (absolute), and
measurement of the output spectrum – which is modified by nonlinear
effects. Both methods use calculations that combine these measured
results with those derived from other measurements such as
attenuation (FOTP-61 or FOTP-78) and chromatic dispersion (FOTP-
168, FOTP-169, or FOTP-175). Both methods have limitations on the
length of fiber that can be measured – in a relationship with the
chromatic dispersion at the wavelength being measured.

Additional information