Abstract
A novel mode analysis method and differential mode delay (DMD) measurement technique for a multimode optical fiber based on optical frequency domain reflectometry has been proposed for the first time. We have used a conventional OFDR with a tunable external cavity laser and a Michelson interferometer. A few-mode optical multimode fiber was prepared to test our proposed measurement technique. We have also compared the OFDR measurement results with those obtained using a traditional time-domain measurement method.
Highlights
Many enabling technologies for an optical gigabit Ethernet system based on an 850 nm Vertical Cavity Surface Emitting Laser (VCSEL) have received much attention recently
The development of a multimode fiber (MMF) optimized for 850 nm wavelength operation is one of the most important components required for 10 Gb/s next-generation transmission local area network (LAN) systems [1]
In the traditional timedomain differential mode delay (DMD) measurement method, a short pulse is transmitted to an MMF under test
Summary
Many enabling technologies for an optical gigabit Ethernet system based on an 850 nm Vertical Cavity Surface Emitting Laser (VCSEL) have received much attention recently. Pulse spreading or broadening due to the propagation speed differences for each mode of an MMF is measured in the time domain using a fast time-domain detection technique This conventional DMD measurement method is both complicated and expensive, because it utilizes ultra-short pulses from a laser source and it requires a fast detection system such as a streak camera or a fast detector combined with a sampling oscilloscope. We present a simple, new differential mode delay measurement method in the frequency domain, where there is little limitation due to the chromatic dispersion of a fiber. The principle of the conventional DMD measurement method is same as that of an optical time domain reflectometer (OTDR), which measures fault positions, connection loss, and scattering loss distribution along a transmission line by analyzing reflected pulses from various reflection points [4, 5]. We introduce a new optical frequency domain method to analyze the mode structure and the DMD of an MMF using an OFDR for the first time
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