Multicasting in a High-Port Sub- $\mu$ sec Latency Hipo $\lambda$ aos Optical Packet Switch

We demonstrate a Hipoλaos optical packet switch (OPS) configuration that can support optical data multicasting in a sub-μsec 256-port layout. The proposed multicast OPS relies on the low-latency and high-port Hipoλaos OPS architecture, extending its capabilities from unito multicast operation through simple modifications at its egress wavelength-routing stage. It exploits the WDM cyclic properties of the arrayed waveguide grating router stage in conjunction with multi-wavelength conversion (WC) in semiconductor optical amplifier-Mach-Zehnder interferometer (SOA-MZI) toward scaling from a unito a multicast OPS design, with the level of multi-wavelength WC defining the multicast degree. Optical multicasting up to five nodes is experimentally demonstrated at 10 Gb/s, revealing error-free operation at 10
^-9
with less than 2-dB power penalty compared with the unicast operation. The broadband operational characteristics of the multicast operation have been also investigated at 10 Gb/s, utilizing pairs of wavelengths with different channel spacing and validating the multicast credentials of the switch across all the necessary wavelength channels for a 256-port configuration. Finally, a mixed traffic scenario involving both unicast and multicast optical traffic is demonstrated at 10 Gb/s, revealing error-free performance for all cases, with a <;0.2 dB excess power penalty of multicasted packets over the unicast data.