Cisco Technology

In part, in one embodiment the disclosure relates to a laser that includes a laser cavity; an optical gain chip that includes a gain material, the gain material having a gain region, the optical gain chip includes a first waveguide, the first waveguide defines a first section of the laser cavity; an external laser cavity includes a second waveguide, the second waveguide is optically coupled to the first waveguide, the second waveguide defines a second section of the laser cavity; and a DBR ring optically coupled to the second waveguide, the DBR ring includes a loop waveguide optically coupled to the second waveguide and one or more DBR disposed along one or more sections of the loop waveguide, the laser cavity includes the first section of the laser cavity and the external laser cavity; and a PIC that includes the second waveguide and the DBR ring.

An advanced optical device featuring a substrate with a receiver photonic integrated circuit (PIC) and a transimpedance amplifier (TIA) is disclosed. The PIC is mechanically coupled to the substrate, while the TIA is mounted to the substrate and electrically connected to the PIC. One configuration includes a receiver die flip-chip bonded to a TIA die using copper pillar bumps, optimizing space with the PIC having a smaller footprint than the TIA. A fiber array is precisely aligned and attached to the PIC using epoxy bonding, aided by alignment marks indicating spot-size converters (SSCs). The PIC incudes multiple photodetectors and waveguides, enhancing light guidance and conversion. The manufacturing process involves a chip-on-wafer technique, forming a dam for epoxy application, and precise alignment of fiducials to the fiber array. The method also includes molding, forming through-mold vias, and redistributing electrical connections, ensuring efficient signal processing and integration without wire bonding.

In one embodiment, an apparatus includes a substrate comprising a first surface and a second surface opposite to the first surface, an integrated circuit attached to the first surface of the substrate, and a cold plate attached to the second surface of the substrate with an electrical path extending through the cold plate for transmitting power from a power component connected to the cold plate, to the integrated circuit.

In one embodiment, the disclosure relates to an electro-optical device that includes an optical gain chip that includes; a gain material, the gain material having a gain region, the optical gain chip that includes: N gain chip waveguides; a photonic integrated circuit (PIC) that includes a plurality of layers and a plurality of components, wherein the PIC defines M sections; N external laser cavities; P PIC waveguides; and B distributed Bragg reflector (DBR) rings, wherein each of the N external laser cavities is defined by one of the P PIC waveguides and one of the B DBR rings; and N laser cavities, wherein each laser cavity of the N laser cavities comprises one of the N external laser cavities and one of the N gain chip waveguides.

Devices and methods for managing congestion notifications for Low Latency, Low Loss, and Scalable throughput (L4S) data flows are provided. A device receives a downstream data flow including multiple downstream data packets and identifies one or more downstream L4S data packets therefrom. The device stores the downstream L4S data packet(s) in a queue and detects a congestion in downstream based on the queue. The device transmits, at a lower protocol layer, an indication of the congestion to a wireless device that is a destination of the downstream L4S data packet(s). The wireless device marks at least one downstream L4S data packet with a congestion indicator based on the indication of the congestion. Such congestion indication provides a fast congestion notification associated with the L4S data flows to facilitate a fast response to the congestion and a reduction of congestion-related packet drops at the device.

A seamless mobility domain (SMD) is described where a PTK for a wireless device is pre-computed or pre-generated before the client roams from a serving AP to a target AP in the SMD. The pre-computed PTK can be distributed (i.e., pushed) to one or more target APs before the wireless device roams, or the PTK can be stored in a key stored and then retrieved from the key store by a target AP once the wireless device roams to the target AP. In another embodiment, the PMK and/or PTK keys are generated using a SMD identifier, such as a SMD MAC address or a special ID for the SMD.

In one embodiment, a method comprises identifying at a first powered device in communication with power sourcing equipment, a second powered device in communication with the first powered device, wherein the first powered device is receiving high voltage pulse power from the power sourcing equipment, notifying the power sourcing equipment of the second powered device at the first powered device, and performing a low voltage power initialization at the first powered device with the second powered device before passing the high voltage pulse power to the second powered device. The first powered device comprises a local isolation switch for a first low voltage pulse power initialization with the power sourcing equipment at start-up of the first powered device and for receiving the high voltage pulse power from the power sourcing equipment and an output isolation switch for said low voltage power initialization with the second powered device and for passing the high voltage pulse power to the second powered device.

Systems and methods provide for synergistic domain name (DNS) security updates. A method comprises querying a local domain name system, DNS, blacklist/whitelist regarding a domain. Pushing, in response to a first answer that the domain is not on the local DNS blacklist/whitelist, a query regarding the domain to an advanced DNS security at an associated cloud security system. Querying, in response to a second answer that the domain is cleared at the advanced DNS security, a locally-implemented advanced securities policy on the edge network device. Detecting a threat or clearance regarding an associated domain via the locally implemented advanced securities policy. Finally, an upstream update is sent from the edge network device.

Devices and methods are provided for exchanging route type capabilities between peer network devices, for example, Border Gateway Protocol (BGP) speakers, to prevent a BGP session reset when a particular route type is not supported by one of the peer network devices. A network device, that supports a set of route types, receives an announcing message indicating a route type capability of a peer network device. The network device selects a subset of route types supported by the peer network device from the set of route types based on the route type capability of the peer network device. The network device transmits an update message that advertises the subset of route types to the peer network device. Thus, a route type supported by the network device is not included in the update message if the route type is not advertised in the announcing message by the peer network device.

Disclosed is a method for load balancing at the source side rather than the destination side of a network. Destination networks can communicate with source load balancers by transmitting network protocol advertisements such as border gateway protocol (BGP) advertisements. The advertisements can communicate prefixes representing available subnets for load balancing purposes. The source load balancer would then load balance and transmit the network traffic along a path made up at least in part by the prefixes advertised by the network.