English: Conceptually, a conventional fibre optic gyro (FOG), shown on the left, can be divided into two semicircular sections with extended fibre connecting the end sections as shown on the right, creating a fibre optic conveyor (FOC). Use of different lengths for the straight-fiber segments with the same semicircular end sections demonstrates that the travel time difference between two beams through the loop is a summation of all the travel time differences between two beams in each segment of the loop, regardless whether the fibre is straight or rotating. Other configurations, not shown, show that the travel time difference in FOG and FOC is not dependent on the enclosed area, but rather conforms to the equation Δt = 2vL/c2, whose derivation is based on the constant speed of light. Hence, the operation of the FOC is completely consistent with relativity.
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