Novel Fiber Optic Current Transformer With New Phase Modulation Method

Birefringence modulation in fiber-optic phase modulators.

We report an unusually large birefringence modulation in fiber-optic phase modulators formed with cylindrical piezoelectric transducers when driven at a few hundred kilohertz. The magnitude of the birefringence modulation is a strong function of modulation frequency. A simple model is used to explain the phenomenon, and the theoretical predictions agree well with the experimental results.

Gated phase-modulation feedback approach to fiber-optic gyroscopes.

A new approach to closed-loop operation of an all-fiber-optic gyroscope using phase modulation and signal gating is described. This approach provides simplicity of implementation and the capability of wide dynamic range with an approximately linear scale factor. Experimental results are compared with theoretical calculations.

Scale-factor-stabilized fiber-optic gyroscope by deep phase modulation.

A scale-factor-stabilized fiber-optic gyroscope by deep phase modulation is demonstrated. There are two servo loops included in this system. The first servo loop is used for stabilization of the light intensity output of the fiber-optic gyroscope. The second loop is used to stabilize the phase-modulation index. The third-harmonic frequency of the phase-modulation signal is used for detection of...

Continuous Phase Modulation for High Speed Fiber-optic Links

A New Current Transformer Model

This paper presents a current transformer model that is useful on low frequency applications. To describe the iron core magnetic behaviour of the iron core, a hysteresis model is proposed, which is able to generate minor asymmetric loops and remanent flux. The effects of classic eddy current losses and anomalous losses are represented by linear and nonlinear resistors, respectively. The obtaine...