850 nm single mode VCSEL-based 25Gx16 transmitter/receiver boards for parallel signal transmission over 1 km of multimode fiber

Abstract

ABSTRACT We manufacture and compare parallel optical transceiver an d receiver assemblies on test boards for parallel datatransm ission over multimode fiber us ing single mode (SM) and multimode ( MM) vertical-cavity surface-emitt inglaser (VCSEL) arrays. VCSELs, GaAs PIN photodetector arrays, commercially-available 12 channel VCSEL driver arrays and 12 channel limiting amplifier arrays were assembled into multi-channel transceiver and recei verassemblies on testboards designed to operate up to 16 channels and coupled to multimode fiber ribbon throughindustrial connectors. MM VCSEL arrays easily allow 25 Gb/s error-free data transmission over 100m of OM4 fiber with only a minor penalty in the sensitivity (0.5 dB). As opposite increasing the distance to 150-200 m cau sesa strong increase in the noise level making the error free transmission at 200 m impossible. Using of single m odeSM VCSEL arrays allo ws error-free 25 Gbit/s NRZ PRBS 2 15 -1 transmission over 1 km distances over OM4 fibe rand above 600 m over OM3 fiber. In a different set of experiments PAM4 transmission up to 50 Gbit/s using SM VCSEL arrays is studied. Keywords: VCSEL, single mode, high speed data transmission, PIN photodiode, optical interconn ect.1.IN TRODUCTI ONW ith further increase in the productivity of processors, which is doubling each year, the single channel bit data rate of 25 Gbit/s is becoming a mainstream. Much higher data rates will be required soon. For short distances high speed optical interconnects are realized utilizing vertical-cavity surface-emitting lasers (VCSELs) in combination with multimode fiber (MMF) representing the installed base of datacenters and the most powerful supercomputers. The temperature insensitive 25 Gbit/s data transmission at a sensitivity of (-10) dBm at a bit error rate (BER) <10