A Survey on OFDM-Based Elastic Core Optical Networking <s> b) MEMS-Based Bandwidth-Variable WSS <s> We present a high-resolution blocking filter, which seamlessly supports data rates from 2.5 Gbit/s to 160 Gbit/s with a granularity of 13.2 GHz. The filter consists of a linear array of 64 MEMS micromirrors and a high-dispersion echelle grating. <s> BIB001 </s> A Survey on OFDM-Based Elastic Core Optical Networking <s> b) MEMS-Based Bandwidth-Variable WSS <s> This work presents a high-resolution (13.2 GHz) channel-blocking optical filter, suitable for use as a reconfigurable optical add/drop multiplexer (ROADM), which seamlessly supports data rates from 2.5 to 160 Gb/s. The filter consists of a linear array of 64 MEMS micromirrors and a high-dispersion echelle grating. The demonstrated device had an insertion loss of 9 dB, a loss ripple of 1.2 dB, and a group delay ripple of 15 ps. Data transmission through the device with various mixed data rate scenarios ranging from 2.5 to 160 Gb/s showed negligible penalty, except at 40 Gb/s where a maximum penalty of 1.5 dB was observed due to a phase coherence with the blocker filter ripple. <s> BIB002 </s> A Survey on OFDM-Based Elastic Core Optical Networking <s> b) MEMS-Based Bandwidth-Variable WSS <s> A practical scheme to perform the fast Fourier transform in the optical domain is introduced. Optical real-time FFT signal processing is performed at speeds far beyond the limits of electronic digital processing, and with negligible energy consumption. To illustrate the power of the method we demonstrate an optical 400 Gbit/s OFDM receiver. It performs an optical real-time FFT on the consolidated OFDM data stream, thereby demultiplexing the signal into lower bit rate subcarrier tributaries, which can then be processed electronically. <s> BIB003
A bit-rate and spacing-flexible wavelength blocking filter based on Micro-Electro Mechanical System (MEMS) was presented in BIB001 BIB002 . This blocking filter is based on a free-space diffraction grating, combined with a linear array of single-tilt axes MEMS, as shown in Fig. 15 . Multiple contiguous 13.2 GHz granularities can be combined to form a wider passband, allowing variation of the spectrum width and the location of the selected channels. Experiments showing the viability of this BV-filter to support a wide range of data rates including 2.5 Gb/s NRZ, 10 Gb/s NRZ, BIB003 Gb/s NRZ, and 160 Gb/s CSRZ were carried out BIB001 BIB002 .