We demonstrate the first InP monolithic tunable optical router with error-free 40 Gbps operation per port. The device has eight wavelength converters and an 8×8 arrayed-waveguide grating router, yielding more than 200 on-chip functional elements.

The world's first InP 8×8 monolithic tunable optical router (MOTOR) operating at 40 Gbps line rate per port

Communications interconnects and networks will continue to play a large role in contributing to the global carbon footprint, especially in data center and cloud-computing applications exponential growth in capacity. Key to maximizing the benefits of photonics technology is highly functional, lower power, and large-scale photonics integration. In this paper, we report on the latest advances in the photonic integration technologies used for asynchronous optical packet switching using an example photonic integrated switched optical router, the label switched optical router architecture. We report measurements of the power consumed by the photonic circuits in performing their intended function, the electronics required to bias the photonics, processing electronics, and required cooling technology. Data is presented to show that there is room (potentially greater than 10 ×) for improvement in the router packet-forwarding plane. The purpose of this exercise is not to provide a comparison of all-optical versus electronic routers, rather to present a data point on actual measurements of the power contributions for various photonic integration technologies of an all-optical packet router that has been demonstrated and conclude, where the technology can move to reduce power consumption for high-capacity packet routing systems.

/pdf/integrated-photonics-for-low-power-packet-networking-5ch0dch2a7.pdf

Integrated Photonics for Low-Power Packet Networking

In this letter, we demonstrate that all-optical network subsystems, offering intelligence in the optical layer, can be constructed by functional integration of integrated all-optical logic gates and flip-flops. In this context, we show 10-Gb/s all-optical 2-bit label address recognition by interconnecting two optical gates that perform xor operation on incoming optical labels. We also demonstrate 40-Gb/s all-optical wavelength-switching through an optically controlled wavelength converter, consisting of an integrated flip-flop prototype device driven by an integrated optical gate. The system-level advantages of these all-optical subsystems combined with their realization with compact integrated devices, suggest that they are strong candidates for future packet/label switched optical networks

/pdf/all-optical-network-subsystems-using-integrated-soa-based-296vrtfywe.pdf

All-optical network subsystems using integrated SOA-based optical gates and flip-flops for label-swapped networks

We demonstrated all-optical label storing and switching for 40 Gb/s optical packets by using all-optical signal processing of multimode interference bistable laser diode optical flip-flops. The stored optical labels in the optical flip-flop controlled an all-optical switch to forward the injected optical packets. The 40 Gb/s optical packets were successfully switched in the all-optical scheme with 11-dB extinction ratio. Error-free operation for the output packets from the switch was also obtained with 1.3-dB power penalty. The presented all-optical packet switching has the advantages of ultrafast switching and transparency of data rate and format, suitable for the future optical networks.

All-optical switching of 40 Gb/s packets by MMI-BLD optical label memory

All-optical switching of 320Gb/s packets by MMI-BLD optical label memory

We describe the operation of a packet switch that dynamically forwards 40 Gbps optical packets based on asynchronously recovered WGbps optical headers using highly-integrated InP photonic circuits. Results of both Layer 1 and Layer 2 performance measurements are presented. (2 pages)

All-optical asynchronous variable-length optically labelled 40 Gbps packet switch

We describe the first monolithically integrated tunable optical packet forwarding chip in InP. The chip consists of a differential Mach-Zehnder interferometer SOA 40 Gbps wavelength converter integrated with Mach-Zehnder modulator for 10 Gbps label modulation. (2 pages)

Monolithic widely tunable optical packet forwarding chip in InP for all-optical label switching with 40 Gbps payloads and 10 Gbps labels

We demonstrate simultaneous multiplexing/demultiplexing operation of a 2x2 all-optical packet switch loaded with a random iMix stream of asynchronous variable-length 40Gbps optically-labelled packets. Layer-2 performance shows ≫ 95% optical label and ≫ 90% packet throughput for both ports.

Demonstration of Simultaneous Multiplexing/Demultiplexing Operation of an All-Optical 2x2 Packet Switch with Asynchronous Variable-length Optically Labeled 40Gbps Packets

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All-optical asynchronous variable-length optically labelled 40 Gbps packet switch

Monolithic widely tunable optical packet forwarding chip in InP for all-optical label switching with 40 Gbps payloads and 10 Gbps labels

Demonstration of Simultaneous Multiplexing/Demultiplexing Operation of an All-Optical 2x2 Packet Switch with Asynchronous Variable-length Optically Labeled 40Gbps Packets