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.
"In addition, there are several advantages of microring generated BPSK, such as resilience to chromatic dispersion and lower driving voltage . A theoretical simulation shows only 0.8 dB power penalty between all-ring based BPSK and conventional BPSK link . Therefore, we expect the receiver sensitivity to be improved using optical packaging of silicon chips with reduced coupling loss  and optimized device designs. "
[Show abstract][Hide abstract] ABSTRACT: We design and demonstrate for the first time an end-to-end binary phase-shift keying (BPSK) link based on silicon microring resonators, with an operational bit-rate at 10 Gb/s. The obtained bit-error-rate is below the forward error correction limit, validating the practical application of the demonstrated technique. Performance comparisons to conventional BPSK modulation and demodulation techniques are also made. The microring-based BPSK link promises a compact, energy efficient, and low-cost interconnect solution for high-capacity transceivers.
"The BPSK signal was then demodulated by the microring through port by generating the AMI signal (Fig. 4d). Note for 10-Gb/s BPSK demodulation, the optimal Q for maximal eye-opening is ~22,000 , close to the microring we used. We also tried microrings with Q of ~5,000, however no successful BPSK demodulation was achieved. "
[Show abstract][Hide abstract] ABSTRACT: We demonstrate the first binary-phase-shift-keying (BPSK) link based on silicon microring resonators, with an operational bit-rate at 10 Gb/s. Bit-error-rate measurements and eye diagrams are used to compare the link’s performance with conventional BPSK modulation and demodulation techniques.
"The PSR is based on a tapered waveguide-based TM 0 -TE 1 mode converter followed by a 2×2 multimode interferometer (MMI) , as shown in Fig. 1(a). An MRR with two identical coupling regions is introduced right after the PSR in order to demodulate the DPSK signal  . In the PSR, the two arms, which connect the TM 0 -TE 1 mode converter and the 2×2 MMI, introduce a π/2 phase difference. "
[Show abstract][Hide abstract] ABSTRACT: Simultaneous polarization demultiplexing and demodulation of PolMux-DPSK signals is demonstrated using a polarization splitter and rotator together with a single microring resonator on a silicon chip. System experimental results validate the concept.
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