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A resonator fiber-optic gyro (R-FOG) is a high-accuracy inertial rotation sensor based on the Sagnac effect. A fiber ring resonator is the core sensing element in the R-FOG. When the frequency of the fiber ring resonator input laser is swept linearly with time, ringing of the output resonance curve is observed. The output field of the fiber ring resonator is derived from the superposition of the light transmitted through the directional coupler directly and the multiple light components circulated in the fiber ring resonator when the frequency of the laser is swept. The amplitude and phase of the output field are analyzed, and it is found that the difference in time for different light components in the fiber ring resonator to reach a point of destructive interference causes the ringing phenomenon. Finally the ringing phenomenon is observed in experiments, and the experimental results agree with the theoretical analysis well. OCIS codes: 060.2370, 060.2800.

This paper describes woven fabrics made from polymer optical fibers (POF), which are treated with a CO2 laser so that the resultant surface notches on the POFs facilitate side emission of light. The transmission and side-emitting behavior of POF with surface notches are studied in term of the variation in bending curvatures, which is related to end-usage of the woven fabrics as flexible displays, wearable phototherapy devices and fashion accessories. The measured power of transmission of light from the POF rapidly decreases with increasing bending curvature. However, the measured power of side-emission of light from the notched POFs remains almost constant at various bending curvatures within the experimental range. Theoretical analysis of the light propagation in a notched POF is conducted, which illustrates that more light is reflected from one side of the notch when the bending curvature is increased hence the transmission of the light is decreased. The theoretical and experimental results reach a good agreement. [ABSTRACT FROM PUBLISHER]