We experimentally demonstrate 112-Gb/s/λ PAM-4 transmission based on 25-Gb/s optics. Over 31-dB power budget is achieved by using OLT-side pre-equalization, amplification and only simple FFE in ONU.
We have realized the 2-μm wavelength detection based on the two-photon absorption from a commercial C-band FP laser at the -1 V bias. The 0.2 μA photocurrent can be observed benefiting from the cavity resonance.
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