22 February 2017 A method for determining the direction of rotation in ring laser gyroscope based on fiber ring cavity and semiconductor optical amplifier
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Abstract
In this work, a simple and straightforward method for determining the direction of rotation in ring laser gyroscope based on fiber ring cavity and semiconductor optical amplifier is demonstrated. The method depends on creating a virtual rotation in a certain direction using an acousto-optic modulator placed outside the ring laser cavity, therefore do not add extra losses, and thus does not affect the cavity’s finesse. The ring cavity supports two counter propagating beams sharing the same SOA gain medium. The acousto-optic modulator shifts one of the two counter propagating beams with an initial frequency bias with respect to the other. This corresponds to a virtual rotation in a certain direction. Therefore, if the RLG actually rotates in the same direction of this virtual one, the shift in frequency between the two counter propagating beams will increase. On the other side if the RLG rotates in the opposite direction to this virtual rotation, then this frequency shift will decrease.
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Ahmed Shebl, Ahmed Shebl, Mohamed Y. Shalaby, Mohamed Y. Shalaby, Khaled Sharaf, Khaled Sharaf, Diaa Khalil, Diaa Khalil, } "A method for determining the direction of rotation in ring laser gyroscope based on fiber ring cavity and semiconductor optical amplifier", Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100832G (22 February 2017); doi: 10.1117/12.2252484; https://doi.org/10.1117/12.2252484
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