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Improvement of group delay measurement accuracy using a two-frequency modulation phase-shift method

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3 Author(s)
Fortenberry, R. ; Cierra Photonics, Santa Rosa, CA, USA ; Sorin, W.V. ; Hernday, P.

The modulation phase-shift method is a standard technique for measuring the group delay and dispersion of fiber-optic devices. The wavelength resolution is typically determined by the radio-frequency modulation frequency. Decreasing the modulation frequency improves wavelength resolution at the cost of decreased sensitivity in the measurement of the time delay. We present a technique that simultaneously yields both high wavelength resolution and high time delay sensitivity by combining two measurements made at different modulation frequencies. High-resolution experimental results are shown for a fiber Bragg grating device.

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Photonics Technology Letters, IEEE  (Volume:15 ,  Issue: 5 )