Schematic of VCSEL-to-VCSEL communication

Schematic of VCSEL-to-VCSEL communication. A link can be established between two identical HCG tunable VCSELs, one being forward biased and operating as a transmitter, while the other being reversed biased and operating as a receiver, and vice versa. (b) BER vs. receiver power at 1 Gb/s data rate for B2B and over 25 km SMF transmission. Inset shows the eye diagram of the transmission over 25 km SMF, for the two cases where VCSEL1 and VCSEL2 acts as a transmitter.