Abstract
As fiber-optic systems turn toward multi-band transmission (MBT), exploiting the complete low loss window of optical fibers, novel optical components, able to operate in bands other than the conventional C-band, become necessary. In light of this, we report on a multi-band photonic integrated <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\mathbf {1\times 2}$</tex-math></inline-formula> wavelength selective switch (WSS) operating in the O, S, C and L-bands. The photonic integrated WSS presented in this work uses a folded arrayed-waveguide grating (AWG) as the filtering element, while the wideband operation of the thermo-optic switches allows the routing of the individual channels from those bands to any of the device output ports. The operation of the WSS is experimentally validated for different bands and modulation formats. Results show error-free operation with limited penalty with intensity-modulation direct-detection (IM/DD) non-return-to-zero on-off keying (NRZ-OOK) up to 35 Gb/s in O, S, C and L-bands and up to 169.83 Gb/s with coherent 64-quadrature amplitude modulation (QAM) data transmission in the S, C and L-bands.
Highlights
I P data traffic demand for metro and data center interconnects (DCIs) is predicted to continue its exponential yearly growth for the foreseeable future [1]
We present a thorough characterization of the multi-band, packaged and pig-tailed 1 × 2 wavelength selective switch (WSS) operating on the O, S, C and L-bands and with 10 Gb/s for all bands, 35 Gb/s for the C and L-bands with non-return-to-zero on-off keying (NRZ-OOK) data as well as multilevel modulation 33.3 GBd 64-quadrature amplitude modulation (QAM) coherent data transmission in the S, C and L-bands
We experimentally demonstrated and assessed a photonic integrated WSS operating in the O, S, C, and Lbands
Summary
I P data traffic demand for metro and data center interconnects (DCIs) is predicted to continue its exponential yearly growth for the foreseeable future [1]. High port-count, flexible grid WSSs finds its use in the metro-core and transport segments of optical networks while in metro-access networks with converged 5G distribution, where it is predicted a large deployment of nodes, a low-cost fixed grid solution for optical add-drop multiplexers (OADMs) is currently preferred Such a solution is shown, where the WSS presented in this work is in a typical two-degree add-drop configuration with a band demultiplexer that separates the multiband wavelength-division multiplexing (WDM) signal before the 1 × 2 WSS modules. The photonic integrated WSS is a one input two outputs (1×2) device, based on silica waveguides on a silicon substrate with a 1.5%∆ contrast and designed for a channel spacing of 100 GHz in the C-band. Increasing the number of channels is possible by using larger relative refractive indexes, ∆, as ∆’s of 2% are already commercially available and ∆’s of 5.5% were reported in [15]
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