Fusion splicer is more and more important in production of Fiber optic gyroscope(FOG).But do you know what is the method of Fiber optic gyroscope?

    Fiber optic gyroscope is based on Sagnac effect, that is, after the light wave propagating in the opposite direction along the closed optical path returns to the initial point of interference, the phase difference of the interference signal is proportional to the input angular velocity of the sensitive axis of the closed optical path.

    The optical path of an interferometric fiber optic gyro is shown below. It consists of a light source, a detector, a beam splitter, a collimating lens, and an optical fiber coil.

    The light wave emitted from the light source is divided into two beams by the beam splitter. One beam transmitted by the beam splitter is coupled into the optical fiber coil through the collimator lens and then propagated clockwise. The other beam is transmitted by the optical fiber coil after being collimated through the collimator lens.

    The other beam is reflected by the beam splitter and then coupled into the optical fiber coil through the collimator lens and then propagated counterclockwise. After exiting from the optical fiber coil, the beam is collimated through the collimator lens and reflected by the beam splitter.

    The intensity of the interference signal varies with the change of the input angular velocity in the normal direction of the fiber coil. The change of the input angular velocity can be obtained by detecting the intensity change of the interference signal through the detector. Based on Sagnac effect, the light wave propagating in the opposite direction along the closed optical path returns to the initial point after interference. The phase difference of the interference signal is proportional to the input angular velocity of the sensitive axis of the closed optical path.

    The optical path of an interferometric fiber optic gyro is shown in Figure 1-2. It consists of a light source, a detector, a beam splitter, a collimating lens, and an optical fiber coil.

    The light wave emitted from the light source is divided into two beams by the beam splitter. One beam transmitted by the beam splitter is coupled into the optical fiber coil through the collimator lens and then propagated clockwise. The other beam is transmitted by the optical fiber coil after being collimated through the collimator lens.

    The other beam is reflected by the beam splitter and then coupled into the optical fiber coil through the collimator lens and then propagated counterclockwise. After exiting from the optical fiber coil, the beam is collimated through the collimator lens and reflected by the beam splitter.

    The intensity of the interference signal varies with the change of the input angular velocity in the normal direction of the optical fiber coil. The change of the input angular velocity can be obtained by detecting the intensity change of the interference signal through the detector.

    In below Image you can find there are around 10 splicing points in a FOG system. A good PM fusion splicer could offer best splicing performance to keep the whole system at a hight level.Shinho S-12PM fiber fusion splicer has the autmatic alignment and splicing system with high ER performance. ER for PM980 splicing could be -33dB.