Microring-based modulation and demodulation of DPSK signal

ArticleinOptics Express 15(18):11564-9 · October 2007with7 Reads
Impact Factor: 3.49 · DOI: 10.1364/OE.15.011564 · Source: PubMed


    Ultra-small modulator and demodulator for 10 Gb/s differential phase-shift-keying (DPSK), using silicon-based microrings, are proposed. A single-waveguide microring modulator with over-coupling between ring and waveguide generates a DPSK signal, while a double-waveguide microring filter enables balanced DPSK detection. These modulator and demodulator are characterized. A trade-off between pattern dependence of the Duobinary signal and alternate-mark inversion signal power in demodulator design is discussed. Power penalty of the proposed approach is 0.8 dB relative to baseline using conventional modulation and demodulation techniques.