Abstract
We proposed novel 16λ demultiplexer based on cascaded connection of silicon-nanowire waveguide type delayed interferometric filters and arrayed waveguide gratings, and experimentally verified 100-GHz-spaced bandpass filtering operation with nearly identical insertion loss (<; 6 dB) and low crosstalk (<; -19.5 dB to <; -34.6 dB for a single channel, <; -12.7 dB for entire output channels). We also demonstrated polarization diversified operation with 32 Gbps non-return-to-zero (NRZ) signal transmissions in C-band range. We also verified the operation of 140-GHz-spaced bandpass filtering in O-band spectral range.
Highlights
E XPLOSIVE data traffic growth via cloud networks and 5G mobile communications stimulated to require more advanced optical technologies such as wavelength division multiplexing (WDM) or coherent technologies for long reach datacenter applications [1]–[4] in order to further enhance the signal communication bandwidth
As an alternative way to circumvent the aforementioned problem, we propose a novel MUX/DeMUX consisting of flatband Digital Object Identifier 10.1109/JLT.2020.2969240Mach-Zehnder interferometers (DMZIs)-type interleavers and pair of arrayed waveguide grating (AWG)
Since the proposed device is all-passive type scheme and its characteristics are determined by the phase relation of spatially separated lightwaves at multiple optical paths within the DMZI interleavers and the AWGs, filter spectral response in terms of center wavelength and spectral crosstalk is largely influenced by the fabrication technology
Summary
E XPLOSIVE data traffic growth via cloud networks and 5G mobile communications stimulated to require more advanced optical technologies such as wavelength division multiplexing (WDM) or coherent technologies for long reach datacenter applications [1]–[4] in order to further enhance the signal communication bandwidth. Together with several optical functional elements (i.e., optical sources, modulators and detectors) in the silicon photonic integrated circuits [5], [6], silicon wire waveguide type multiplexers/ demultiplexers (MUX/DeMUX) are required to process the WDM optical signals [7], [8]. Increasing free-spectral range (FSR) of the AWG can be one of efficient ways of improving the IL and the uniformity, it may cause to make the device size markedly larger to preserve spectral properties such as filter bandwidth and spectral crosstalk etc [15]. In order to cope with this situation, by utilizing polarization diversity scheme, we verify 16λ demultiplexing together with 32 Gbps modulated non-return-to-zero (NRZ) signal transmission for orthogonally polarized inputs in C-band range. We identify the device operability in O-band range for extending application areas
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