Fig. 4
Measured results of devices and FMF-chip-FMF system. a-f Measured transmission spectra for the 6 × 6 optical switch with a representative switching status (1−2, 2−4, 3−1, 4−3, 5−6, 6−5), with the light injected into different input port (a) I1, (b) I2, (c) I3, (d) I4, (e) I5, (f) I6, respectively. g Normalized transmission of the MZI cross port as a function of different heating powers. h Measured switching response of the MZI switch operating with different heating voltages. i, j Normalized crosstalk matrixes of two sets of mode-division multiplexing and demultiplexing system with 150-m-long FMF before and after the silicon switch chip. k, l Measured crosstalk matrixes for different mode/polarization channels of the whole FMF-chip-FMF mode/polarization transmission and switching system for the functions of switching and routing. k Switching function (1−2, 2−4, 3−1, 4−3, 5−6, 6−5). l Routing function (1–1, 1–2, 1–3, 1–4, 1–5, 1–6)