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Meanwhile, Internet topologies have strongly relied on resilient multi-homing techniques and on the Virtual Private Network (VPN) for enhanced network resiliency or security, necessitating additional physical or logical communication links [4].

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Furthermore, by combining optical Column/Row Address Selectors [45,46] and optical Tag Comparators [47], the first designs of a complete optical cache memory architecture for high-performance computers revealed a 16 GHz operation via physical layer simulations [48].

All of these have increased the maturity of optical memories towards penetrating the computing domain, where the use of electronics is so far undisputable, whereas in optical networks, optical FFs have been suggested for contention resolution [49].

Electronic Content Addressable Memories (CAM) implement Address Look-Up (AL) table functionalities of network routers; however, they typically operate in the MHz regime, turning AL into a critical network bottleneck.

In this communication, we demonstrate the first steps towards developing optical CAM alternatives to enable a re-engineering of AL memories.

IPv6 offers a higher availability for address space, but at the same time, quadruples the needs of Address Look-Up (AL), while scaling at a frantic annual growth rate of 90% [6].

As a result, the Default Free Zone (DFZ) has been constantly expanding, with the Routing Information Base (RIB) of Internet core routers increasing up to 700 K prefix-entries [7], requiring increasingly more search intensive operations to resolve the outgoing port of an incoming packet.At the same time, optical memories have undergone two decades of developments and are now on the verge of developing higher capacity [30], programmable [31], and/or non-volatile [32] devices towards more practical memory sub-systems.Initially, optical memories were conceived as high bandwidth alternatives of electronic RAMs to overcome the “Memory Wall”, achieving multiple elementary Flip-Flops (FFs) with high speed and low power consumption credentials [33,34,35,36,37,38,39,40,41], including coupled SOAs [34], III-V-on-SOI microdisk lasers [35], and polarization bistable Vertical Cavity Surface Emitting Laser (VCSEL) [36], as well as coupled SOA-based Mach-Zehnder Interferometers (SOA-MZIs) [33,37].These results imply that electronic T-CAMs are hard-limited by the underlying interconnect network and can rarely reach the barrier of 1 Gb/s.This barrier was only recently broken using alternative non-optimal techniques that may use early predict/late-correct schemes [21], which are yet known to be heavily dependent on data patterns [17].Firstly, we report on the photonic integration of Semiconductor Optical Amplifier-Mach Zehnder Interferometer (SOA-MZI)-based optical Flip-Flop and Random Access Memories on a monolithic In P platform, capable of storing the binary prefix-address data-bits and the outgoing port information for next hop routing, respectively.

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