25-Gb/s transmission over 250-m MMF using over-drive of 10-Gb/s VCSEL by utilizing asymmetric pre-emphasis

We developed a 25-Gb/s transmitter with an over-drive of 10-Gb/s VCSEL using our asymmetric pre-emphasis design. Owing to the narrow spectral width characteristics of our transmitter, we demonstrate 25-Gb/s transmission over 250-m of multimode fiber.