Method of determining the zero dispersion wavelength of an optic

Details Method of determining the zero dispersion wavelength of an optic Method of determining the zero dispersion wavelength of an optic

1995-03-24

1996-09-17

Ngo, John

Optical waveguides

With optical coupler

Particular coupling function

385 24, 385147, G02B 628

Patent

active

055576940

ABSTRACT:
It is necessary to know the zero dispersion wavelength .lambda..sub.0, to ensure the reliable transmission of high bit-rate frequency signals via remote transmission paths. The method for determining the zero dispersion wavelength of an optical waveguide knowingly utilizes a disturbing effect that is undesirable in optical communications transmission techniques, which is able to lower the transmission quality. This effect is the so-called four-wave mixing, or in special cases a partially degenerated four-wave mixing. The method couples two light signals of different wavelengths (.lambda..sub.1, .lambda..sub.2) into an optical waveguide (4). A mixing product which occurs in the optical waveguide as a result of a partially degenerated four-wave mixing is evaluated by an analyzer (3). The wavelength of one of the two light signals is selectively varied until the optical output of the mixing product reaches a maximum. At that point the wavelength of this light signal coincides with the zero dispersion wavelength .lambda..sub.0.

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