On-Chip Dual-Stream DWDM Eight-Channel-Capable SOI-Based MUX <roman>s</roman>/DEMUX <roman>s</roman> With 40-GH <roman>z</roman> Channel Bandwidth

Abstract

We demonstrate two 8 Â 1 silicon ring resonator (RR)-based multiplexers (MUXs) integrated on the same chip for dual-stream 16-channel multiplexing/ demultiplexing applications. Cascaded second-order RRs equipped with microheaters were integrated on a silicon-on-insulator platform with the radii of MUX1 and MUX2 being $12 and $9 m, respectively. The resonances of the two MUXs were thermooptically tuned in order to achieve 100-GHz channel spacing, revealing a tuning efficiency of 43 and 36 W/GHz/RR for MUX1 and MUX2, respectively, and 352 mW total power consumption. Lower than $18 dB crosstalk and higher than $40-GHz 3-dB bandwidth was obtained for the tuned channels of the MUXs. The signal integrity when using these devices in multiplexing and demultiplexing operations was evaluated for a 4 Â 10 Gb/s non-return-to-zero data stream (i.e., 10 Gb/s line rate) via bit-error-rate measurements, yielding error-free performance with up to 0.2 dB power penalty for all channels. Proofof-concept demonstration for supporting higher data rates was also realized by using three 100-GHz-spaced 25-Gb/s return-to-zero data signals (i.e., 25 Gb/s line rate) for multiplexing and demultiplexing via MUX2, resulting in error-free operation for all channels with lower than 0.3 dB power penalties.

Silicon photonic filters

“…Currently, silicon photonic filters have been used widely as a key role in not only the wavelength‐division‐multiplexing (WDM) systems but also spectroscopy sensing. Here, we mainly focus on silicon‐based on‐chip WDM filters with different structures, such Mach‐Zehnder interferometers (MZIs), 12‐19 micro‐ring resonators (MRRs), 20‐34 waveguide Bragg gratings, 35‐46 arrayed‐waveguide gratings (AWGs), 47‐64 and echelle diffraction gratings (EDGs) 62,65‐67 . Figure 1 gives a summary of the reported on‐chip photonic filters based on silicon‐on‐insulator (SOI) nanophotonic waveguides.…”