A single device which can demodulate both DPSK and DQPSK formats by simply rotating a quarter-wave plate
is proposed in this paper. Through introducing LC phase retarder and polarization-dependent phase
compensation, fast tuning time of 50ms and low PDFS of less than 300MHz are successfully realized.
We theoretically and experimentally report a single-wavelength module of 1x4 wavelength selective switch (WSS)
module based on the bi-axial MEMS mirror and thin film filter technology. With a cascaded structure of such WSS
module, a novel 1xN WSS can be realized. The insertion loss of 3dB, extinction ratio > 50dB and hitless switching are