An all-optical half adder using an SOA-assisted Sagnac interferometer
has been suggested and demonstrated by several groups of researchers [17-19].
Hydrostatic pressure sensors based on birefringent fibers are not compact since they usually need non-fiber components to detect the pressure-induced phase or use the fiber Sagnac interferometer with a relatively long sensing fiber.
Khijwania, "Pressure sensor realized with polarization-maintaining photonic crystal fiber-based Sagnac interferometer," Appl.
Tam, "Temperature-insensitive strain sensor with polarization-maintaining photonic crystal fiber based on Sagnac interferometer," Appl.
Since the phase difference of counterrunning waves caused by the rotation is inversely proportional to the wavelength, it is evident that the Sagnac interferometer
sensitivity at radio waves is 107 lower than the sensitivity under the other equal conditions expected in the optical range.
More recently, several all-fiber hydrostatic pressure sensors such as hydrostatic pressure sensors based on all-fiber Sagnac interferometer
, dual-core fiber , or fiber Bragg grating  have been proposed, which will be more suitable for applications in a harsh environment.
The Sagnac interferometer is based on the Sagnac effect, reported by G.
Let us now assume that the Sagnac interferometer and its light laser beams are in the region of space around the Earth where the gravitational potential is given by equation (3) and let us further assume that the quantum correction to the potential is really negligible.
Let now a Sagnac interferometer be aboard a satellite in a circular polar orbit of inclination i = 90 degrees.
For this last case of the elliptical orbit in (25) and (26) where the Sagnac interferometer is on the satellite and we assume [R.
To attempt increasing the resolution of the phase difference of the Sagnac interferometer let us now propose a Sagnac loop, that has the shape of an ellipse that rotates with an angular velocity [OMEGA].
Let now as before have a Sagnac interferometer be aboard a satellite in a circular polar orbit of inclination i = 90 degrees.