Fig. 6
Measured BER performance for the 6 × 6 optical switch. The switching status is a 1−2, b 2−4, c 3−1, d 4−3, e 5−6, f 6−5. The I(O)1, I(O)2, I(O)3, I(O)4, I(O)5, I(O)6 input (output) ports of the 6 × 6 silicon switch are connected to the LPb11x, LPb11y, LPa11x, LPa11y, LP01x and LP01y mode output (input) of the demultiplexer (multiplexer), respectively. The insets show the typical constellations of QPSK signals