Generator for generating an anti-Kerr-effect modulated light signal, interferometry measuring device comprising such a generator, and method for modulating a light signal

Disclosed is a generator for generating an anti-Kerr modulated light signal, including a primary light source having four longitudinal modes or fewer and configured to generate a light signal and a modulator configured to modulate the power of the light signal by way of a square-wave or rectangular-wave control signal the duty cycle of which is less than or equal to 50%, and which are adapted such that the modulated light signal is periodic and has: —at a first point of the signal, a first power value equal to the product of its average power and a gain between 1.6 and 2.4; —at a second point of the signal, a second, non-zero power value, that is different from the first power value. Also disclosed is a modulation method and to a measuring device.