Figure 6.

On-chip unscrambling of MDM optical channels. (a) Information encoded in four scrambled 10 Gbit s⁻¹ intensity modulated MDM channels is recovered after mode reconstruction performed by the silicon photonic mesh. (b) As a consequence of mode mixing, the spectrum of the four mixed channels (black curves) exhibits deep time-varying oscillations, which disappear after mode reconstruction (mode A, blue curves). Displayed curves refer to 10 successive measurements taken at output port Out_1. The corresponding time domain signals are shown in the eye diagrams in the insets. Eye diagram (c) and BER (d) measurements (port Out₁) demonstrate that information encoded in each channel can be retrieved with a very small power penalty independent of the number of mixed modes.