Four 45 Gbps PAM4 VCSEL based transmission through 300 m wideband OM4 fiber over SWDM4 wavelength grid

Abstract

We demonstrate successful transmission of four 45 Gbps PAM4 single-channels through OM4 multimode fibers (MMFs) and wideband MMF using a PAM4 PHY chip and four vertical cavity surface emitting lasers (VCSELs) with wavelengths ranging over short wavelength division multiplexing (SWDM) grid. Real-time bit error ratios (BERs) < 2 × 10^-4 were achieved for all four 45 Gbps PAM4 SWDM grid channels over 100 m, 200 m, and 300 m of wideband OM4 MMFs. All four channel received PAM4 optical eyes are shown after propagating through 100 m, 200 m, and 300 m of wideband OM4 as well as 100 m and 200 m conventional OM4 MMFs. The measured BERs as a function of the inner eye optical modulation amplitudes (OMAs) are shown for all four SWDM grid channels. Inner eye OMAs ranged from -16.2 dBm to -13.5 dBm for different channels over different OM4 MMF types at the KP4 BER threshold of 2 × 10^-4.

Reach Extension and Capacity Enhancement of VCSEL-Based Transmission Over Single-Lane MMF Links

“…This MMF is referred to as wide band OM4 (WB-OM4) in this paper. To achieve operation over the wider wavelength the minimum effective bandwidth (the combination of modal and chromatic dispersion) is specified [16]. In this paper we will expand on the previous set of results and combine the several techniques described earlier to achieve 170 Gbps on a single optical fiber at distances up to 300 m. Carrying capacity of MMF is limited by both the effective bandwidth (EB) and the total fiber link length.…”

Multi-wavelength VCSEL arrays using high-contrast gratings

“…Wavelength division multiplexing (WDM) can be used to improve the capacity and bandwidth density of optical interconnects [1]. As a WDM light source, multi-wavelength VCSEL arrays are attractive as they may offer performance, efficiency, and cost advantages over other technologies.…”

High-fidelity spatial mode transmission through a 1-km-long multimode fiber via vectorial time reversal

“…It can be seen that the full-width at half-maximum bandwidth is 22 GHz for LG(0,2) and 5 GHz for LG (3,2), which suggests that the vectorial time reversal can continue to work when the signal is modulated at a rate of several GHz. The commercially available OM4 fiber 40 is an immediate solution to increase the bandwidth because its effective modal bandwidth is twice as large as that of the OM3 fiber that we used. Furthermore, the temporal degree of freedom can also be taken into account in vectorial time reversal to overcome the modal dispersion 23 .…”