Journal
OPTICS EXPRESS
Volume 16, Issue 17, Pages 13342-13348Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.013342
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Funding
- Optical Code Division Multiple Access (OCDMA) program [N66001-02-1-8939]
- Chip Scale WDM (CSWDM) program
- DARPA [F49620-02-1-0403,]
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A compact silicon coupled-ring modulator structure is proposed. Two rings are coupled to each other, and only one of these rings is actively driven and over-coupled to a waveguide, which enables high modulation speed. The resultant notch filter profile is steeper than that of the single ring and has exhibited a smaller resonance shift and lower driving electrical power. Simulations show that: (i) potentially 60-Gb/s non-return-to-zero (NRZ) data modulation with over 20-dB extinction ratio can be achieved by shifting the active ring by a 20 GHz resonance shift, (ii) the frequency chirp of the modulated signals can be adjusted by varying the coupling coefficient between the two rings, and (iii) dispersion tolerance at 0.5-dB power penalty is extended from 18 to 85 ps/nm, for a 40-Gb/s NRZ signal. (C) 2008 Optical Society of America.
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