Fiber Optical Solution’s single- and three-axis FOGs consist of the one light source at 1550 nm wavelengths (superluminescent diode – SLD), depolarizer, one or three photodetectors, fiber splitters to divide the light into two or three parts, one or three sets of ring interferometers to sense one or three orthogonal angular rate, and signal processing circuits. In this design a multifunction integrated optical chip (MIOC) is used for splitting the light into clockwise and counterclockwise waves, light polarization and for electro-optic imparting a phase modulation to the lightwaves in the loop. The signal processing design is based on conversion of the photodetector signal to a digital demodulation and integration. The loop is closed by driving the integrated optical phase modulator with a voltage ramp whose slope is proportional to rotation rate.
All Fiber Optical Solution’s IMUs are based on Fiber Optical Solution’s three axis closed loop fiber optic gyroscopes and three pendulum accelerometers. Latest model – IFOS-400 is the state-of-art miniature FOG IMU with low-noise MEMS accelerometers (3 triads of MEMS utilized and combined)
Fiber Optical Solution’s fiber-optic strapdown inertial navigation systems (SINS) have complete solid-state design with no rotating or other moving parts. Because it has no moving parts, there is nothing to go out of alignment and therefore it never requires re-calibrating and is totally maintenance free. They have very high reliability (MTBF) and no maintenance requirements during its service life.
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