  We propose a novel method for detecting gravitational waves (GW), where a
light signal emitted from a distant star interacts with a local (also distant)
GW source and travels towards the Earth, where it is detected. While traveling
in the field of the GW, the light acquires specific phase modulation (which we
account in the eikonal approximation). This phase modulation can be considered
as a coherent spreading of the given initial photons energy over a set of
satellite lines, spaced at the frequency of GW (from quantum point of view it
is multi-graviton absorption and emission processes). This coherent state of
photons with the energy distributed among the set of equidistant lines, can be
analyzed and identified on Earth either by passing the signal through a
Fabry-Perot filter or by monitoring the intensity-intensity correlations at
different times.
