Silicon-Chip-Based Real-Time Dispersion Monitoring for 640 Gbit/s DPSK Signals

Abstract

Abstract-We demonstrate silicon-chip-based instantaneous chromatic dispersion monitoring (GVD) for an ultrahigh bandwidth 640 Gbit/s differential phase-shift keying (DPSK) signal. This monitoring scheme is based on cross-phase modulation in a highly nonlinear silicon nanowire. We show that two-photon absorption and free-carrier-related effects do not compromise the GVD monitoring performance, making our scheme a reliable on-chip CMOS-compatible, all-optical, and real-time impairment monitoring approach for up to Terabit/s DPSK signals.

Simultaneous Multi-Channel Microwave Photonic Signal Processing

“…While the results shown in this paper focused on photonic RFSA of high repetition rate optical pulse trains, and, in particular, identification of the associated RF frequency tones, we can also monitor impairments such as the impact of dispersion on these pulse trains (see, e.g., [13][14][15][16][17]43]). Moreover, as demonstrated in [48], we can obtain the RF spectra of more arbitrary waveforms such as pulse bursts having uniform, apodized, and ramped envelopes/profiles and frequency content at 40 GHz and 80 GHz.…”

“…While a trade-off between measurement bandwidth and resolution has to be made, photonic implementation of radio-frequency spectrum analysis (RFSA) based on ultrafast nonlinear optics (e.g., Kerr nonlinearity) allows for characterizing signals with a bandwidth well beyond 100 GHz. Photonic RFSA was originally proposed and demonstrated using optical fiber as the nonlinear medium [12]; it has since been reported using integrated technologies in chalcogenide, silicon-on-insulator, and silica material platforms [13][14][15][16][17]. In all demonstrations, however, only a single waveform can be characterized at a time.…”

Cross-Phase Modulation in a Hydrogenated Amorphous Silicon Optical Fiber

“…The dynamics of this behavior can be modeled by a system of coupled nonlinear differential equations [3]:…”

Photonic chip based ultrafast optical processing based on high nonlinearity dispersion engineered chalcogenide waveguides

“…Photonic integration was first introduced in the late 1960's as a platform for compact active and passive functions in optical communication systems [3][4][5]12]. First generation photonic integrated circuits (PICs) were based on the silica platform and there were various impressive demonstrations, some of which were commercialized for advanced passive components (e.g.…”

“…There is a growing demand for compact, ultrahigh bandwidth devices for all-optical processing for which PICs offer a potentially compact and monolithic solution comprising nonlinear elements that can perform all-optical operations on ultrafast time scales [8][9][10][11][12][13]. Semiconductor devices based on III-V materials have been extensively developed for ultrafast all-optical signal processing applications [14,15].…”