We propose a uniform solution for a future client-side 400G Ethernet standard based on MultiCAP advanced modulation format,\nintensity modulation, and direct detection. It employs 4 local area networks-wavelength division multiplexing (LAN-WDM) lanes\nin 1300nm wavelength band and parallel optics links based on vertical cavity surface emitting lasers (VCSELs) in 850 nm wavelength\nband. Total bit rate of 432 Gbps is transmitted over unamplified 20 km standard single mode fiber link and over 40 km link with\nsemiconductor optical amplifier. 70.4 Gb/s transmission over 100m of OM3 multimode fiber using off-the-shelf 850 nm VCSEL\nwith 10.1GHz 3 dB bandwidth is demonstrated indicating the feasibility of achieving 100 Gb/s per lane with a single 25GHz VCSEL.\nIn this review paper we introduce and present in one place the benefits of MultiCAP as versatile scheme for use in a number of\nclient-side scenarios: short range, long range, and extended range.
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