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.
Highlights
Advanced data modulation formats have become quite important within the optical communications community, and of particular interest is differential-phase-shift-keying (DPSK) [1]
The DPSK signal modulated with microring has a transition close to the real axis making it very similar to that of a Mach-Zehnder modulator (MZM)
We note that the microring-based DPSK modulation produces a spectrum very similar to that given by the MZM, it is a little broader in the low-power regions far away from signal carrier due to the chirp
Summary
Advanced data modulation formats have become quite important within the optical communications community, and of particular interest is differential-phase-shift-keying (DPSK) [1]. Several novel demodulation schemes have been reported [3,4,5] These modulators and demodulators are relatively complicated, which causes higher cost of DPSK transmitter and receiver. These devices are fairly large, on the order of a centimeter, which may mean large power consumption. To our knowledge, there is no report to use microring-based devices to generate and demodulate DPSK signals. As compared to conventional MZMs and DLIs, microring structures require a relatively small chip area and low driving power, and are easy to fabricate into arrays. Power penalty is diminished to 0.8 dB with an optimal cavity Q-factor of 22000 for 10 Gb/s non-return-to-zero (NRZ) DPSK, which is relatively low compared to some published demodulation schemes
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