Polarization-transparent silicon photonic add-drop multiplexer with wideband hitless tuneability

Abstract

Flexible optical networks require reconfigurable devices with operation on a wavelength range of several tens of nanometers, hitless tuneability (i.e. transparency to other channels during reconfiguration), and polarization independence. All these requirements have not been achieved yet in a single photonic integrated device and this is the reason why the potential of integrated photonics is still largely unexploited in the nodes of optical communication networks. Here we report on a fully-reconfigurable add-drop silicon photonic filter, which can be tuned well beyond the extended C-band (almost 100 nm) in a complete hitless (>35 dB channel isolation) and polarization transparent (1.2 dB polarization dependent loss) way. This achievement is the result of blended strategies applied to the design, calibration, tuning and control of the device. Transmission quality assessment on dual polarization 100 Gbit/s (QPSK) and 200 Gbit/s (16-QAM) signals demonstrates the suitability for dynamic bandwidth allocation in core networks, backhaul networks, intra- and inter-datacenter interconnects.

Towards a high-density photonic tensor core enabled by intensity-modulated microrings and photonic wire bonding

“…Interferometric coupling-based (or two-point coupled MZI-based) MRRs have been utilized for hitless-switching 22 , high-speed modulation 23 , PAM-4 modulation 24 , photonic delay line 25 , single-photon sources 26 , and post-fabrication correction 27 . Recently, a wideband tunable add-drop multiplexer is reported using interferometeric coupling-based modulators 28 . The proposed design utilizes the similar intensity modulation scheme to achieve ’connection’ and ’disconnection’ of filter channels.…”

Crosstalk-Free 32-ch DWDM Demultiplexer On Standard Si Pic Platform Enabled By Fully-Integrated Cascaded AMZ Triplet

“…Standard Si PIC Platform Enabled by Fully-Integrated Cascaded AMZ Triplet JLT-30474-2022.R1 WDM applications. Coupled rings with different radii exploiting Vernier effect can avoid this problem as well as increase the channel isolation [26], where the calibration was performed based on a pre-calibrated look-up table with elaborate care for thermal crosstalk. This scheme successfully achieved channel isolation of > 35 dB with a 1-ch add-drop filter [26].…”

“…Coupled rings with different radii exploiting Vernier effect can avoid this problem as well as increase the channel isolation [26], where the calibration was performed based on a pre-calibrated look-up table with elaborate care for thermal crosstalk. This scheme successfully achieved channel isolation of > 35 dB with a 1-ch add-drop filter [26]. While it has not yet been demonstrated, this could be a potential candidate once shown to be scalable.…”

Thermally tunable high-order microring filters with large free-spectral-range

“…There are many works based on series microring resonators to achieve performance including large free-spectral-range (FSR), high extinction ratio (ER) and wide bandwidth [5][6][7][8] . However, due to the instability of the process, the error of the process has a great influence on the spectra of the high-order filter.…”