The traditional Overfilled Launch (OFL) method of measuring bandwidth in multimode fiber has been replaced by new, more advanced techniques. The advent of 850 nm VCSEL light sources and 10G laser-optimized 50 μm multimode (OM3) fiber has enabled cost-effective 10G transmission for short reach enterprise applications. Unlike LEDs, VCSELs don’t light up the entire core of a multimode fiber and their power profile varies from one to another. The traditional OFL bandwidth measurement method used for LED systems cannot ensure the performance of VCSEL-based systems, so a new method called Differential Mode Delay (DMD) was developed and standardized.|The traditional Overfilled Launch (OFL) method of measuring bandwidth in multimode fiber has been replaced by new, more advanced techniques. The advent of 850 nm VCSEL light sources and 10G laser-optimized 50 μm multimode (OM3) fiber has enabled cost-effective 10G transmission for short reach enterprise applications. Unlike LEDs, VCSELs don’t light up the entire core of a multimode fiber and their power profile varies from one to another. The traditional OFL bandwidth measurement method used for LED systems cannot ensure the performance of VCSEL-based systems, so a new method called Differential Mode Delay (DMD) was developed and standardized.

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