Microring-based modulation and demodulation of DPSK signal

Department of Information Science and Electronic Engineering, Zhejiang University, Hang-hsien, Zhejiang Sheng, China
Optics Express (Impact Factor: 3.53). 10/2007; 15(18):11564-9. DOI: 10.1364/OE.15.011564
Source: PubMed

ABSTRACT 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.