Microring-based modulation and demodulation of DPSK signal

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.

Multi-Channel 40 Gbit/s NRZ-DPSK Demodulation Using a Single Silicon Microring Resonator

“…However, for drop port demodulation, the AWG improves the receiver sensitivity by about 3 dB, and around 0.5 dB power penalty is further introduced by the crosstalk. As there is a trade off between the performance of the demodulated AMI and DB signals [13], it is found that the MRR with Q value of 6700 associated with the AWG, lead to similar receiver sensitivities for both through and drop port demodulations.…”

“…and are the roundtrip phase shift and field transmission coefficients along the ring waveguide, respectively. NRZ-DPSK signals can be demodulated by the MRR, resulting in the generation of alternate-mark inversion (AMI) and duobinary (DB) signals [13] at the through and drop ports, respectively. Thanks to the periodic nature of the frequency response of the MRR, simultaneous multiple WDM NRZ-DPSK demodulation can be achieved by tuning the carrier wavelength of each channel so that it coincides with one of the notches of the through transfer function.…”

“…Silicon microring resonators (MRRs) are compact and versatile devices whose use as DPSK demodulators has been recently proposed [13] and demonstrated [14] for single channel operation. This scheme is also foreseen to be very attractive for multi-channel applications due to its compact size, integration ability, and CMOS compatible fabrication process.…”

Polarization Diversity DPSK Demodulator on the Silicon-on-Insulator Platform with Simple Fabrication

“…The principle of NRZ-DPSK demodulation is to use the through transmission of a MRR to convert phase modulation to amplitude-modulation [6]. To achieve a Pol-D MRR-based demodulator, a novel PSR is designed, as shown in Fig.…”

“…Various types of DPSK demodulators, including delay interferometers [2], optical bandpass filters [3], a birefringent fiber loop [4], or a single silicon wire [5] have been demonstrated. Recently, the use of silicon microring resonators (MRRs) has been proposed and demonstrated for ultra-compact DPSK demodulation [6,7]. The use of such devices as multi-channel wavelength division multiplexing (WDM) non return-to-zero DPSK (NRZ-DPSK) demodulators has also been demonstrated [8].…”