An improved technique for chromatic dispersion measurements in single-mode fibers using phase-shift measurements is presented. The conventional experimental setup using a modulated light emitting diode (LED) filtered by a monochromator as a light source, a fast receiver, and a vector voltmeter for the phase measurements1 suffers from inherent drawbacks such as strong phase fluctuations due to poor SNR and rf interference providing biased measurements. Our method eliminates these drawbacks with optical signal processing by shifting the modulation frequency down to the kilohertz range and maintaining the phase resolution due to high-frequency modulation.

© 1988 Optical Society of America

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