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High-resolution differential mode delay measurement for a multimode optical fiber using a modified optical frequency domain reflectometer

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Abstract

A novel differential mode delay (DMD) measurement technique for a multimode optical fiber based on optical frequency domain reflectometry (OFDR) has been proposed. We have obtained a high-resolution DMD value of 0.054 ps/m for a commercial multimode optical fiber with length of 50 m by using a modified OFDR in a Mach-Zehnder interferometer structure with a tunable external cavity laser and a Mach-Zehnder interferometer instead of Michelson interferometer. We have also compared the OFDR measurement results with those obtained using a traditional time-domain measurement method. DMD resolution with our proposed OFDR technique is more than an order of magnitude better than a result obtainable with a conventional time-domain method.

©2005 Optical Society of America

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Figures (3)

Fig. 1.
Fig. 1. Experimental set-up for modified OFDR system for DMD measurement of a multimode fiber.
Fig. 2.
Fig. 2. (a) Beating signal of a MMF by using modified OFDR without an offset and (b) beating spectrum from Fourier transformation of the signal
Fig. 3.
Fig. 3. (a) Modal delay measurements of an MMF in time domain using an optical pulse source(sample length is 450 m), and (b) frequency domain using an modified OFDR (sample length is 50 m)

Equations (1)

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τ = f γ = f Δυ / T ,
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