The present invention provides a route and wavelength assignment method based on all-optical wavelength conversion, including the steps of: introducing an all-optical wavelength converter in the network; placing a corresponding number of all-optical wavelength converters in a network node according to the principle of sparse wavelength converter placement; establishing an optical channel for the service, in which the establishing an optical channel includes the steps of: establishing an OSNR awareness route and wavelength assignment algorithm model that includes transmission loss, ASE noise and OSNR penalty; and calculating the OSNR of various routes by using the OSNR awareness route and wavelength assignment algorithm model and establishing the optical channel using the route with the highest OSNR and accomplishing wavelength assignment. The present invention can reduce the cost of all-optical wavelength conversion and the impact of the OSNR penalty on the network performance improvement.

The present disclosure relates to the field of communications technologies, and discloses a channel training method, apparatus, and system, so as to resolve a problem in which a newly added ONU in a PON cannot be registered and go online in time. In embodiments of the present disclosure, a first moment for triggering channel training is determined; normal data is stopped sending from the first moment and a training frame is generated; and then the training frame is sent to all ONUs in a PON, so that a target ONU trains an automatic adaptive equalizer based on the training frame, where the target ONU is at least one of all the ONUs in the PON. The solutions provided in the embodiments of the present disclosure are applicable to the equalizer training the ONU.

Embodiments relate to the field of PON technologies, and provide a method, apparatus, and system. The method includes: receiving capability information that is sent by an ONU by using a first preamble; calculating a tap coefficient based on the received first preamble if the capability information indicates that the ONU has an equalization capability; sending the tap coefficient to the ONU, where the ONU updates a tap coefficient of a first equalizer in the ONU based on the received tap coefficient, and when subsequently sending upstream data, sends, by using a second preamble, the upstream data equalized by using the first equalizer, and a length of the second preamble is less than a length of the first preamble; receiving the upstream data; and equalizing the received upstream data based on the second preamble by using a second equalizer in an OLT. In this way, upstream overheads can be reduced.

A method, a network element, and a network include determining excess margin relative to margin needed to ensure performance at a nominal guaranteed rate associated with a flexible optical modem configured to communicate over an optical link; causing the flexible optical modem to consume most or all of the excess margin, wherein the capacity increased above the nominally guaranteed rate includes excess capacity; and mapping the excess capacity to one or more logical interfaces for use by a management system, management plane, and/or control plane. The logical interfaces can advantageously be used by the management system, management plane, and/or control plane as one of restoration bandwidths or short-lived bandwidth-on-demand (BOD) connections, such as sub-network connections (SNCs) or label switched paths (LSPs).

A method for VON service with guaranteed availability may use probability density functions (PDF) of Q-factor to determine availability of physical links assigned to a virtual link in the VON. Then, a VON mapping may be performed based on the determined availabilities, among other factors.

Disclosed herein are methods and systems for optimizing an optical signal in an optical network having a leaf node with a coherent optical transceiver configured to receive an optical signal continuously transmitted at a first output power from a hub node over a link. The leaf node may be provided with signal quality correction circuitry configured to determine a signal quality of the optical signal and send the signal quality to a processor of the hub node. The processor of the hub node may be configured to compare the signal quality of the optical signal to a target signal quality margin, determine that the signal quality is outside the target signal quality margin, adjust the first output power of the optical signal to a second output power different than the first output power, and continuously transmit the optical signal at the second output power.

An apparatus, method and computer program is described as obtaining forwarded traffic volume data and discarded traffic volume data of a point-to-multipoint communication network in each of a plurality of discrete time periods over an observation period; generating calibrated forwarded and discarded traffic volume data, wherein calibration data is dependent on a calibration level; filtering, by applying signal processing techniques, multiple instances of said calibrated forwarded and discarded traffic volume data; identifying first sample periods within said observation period; and determining impact scores for the forwarded and discarded traffic volume data for each of said one or more first sample periods.

The present invention provides a route and wavelength assignment method based on all-optical wavelength conversion, including the steps of: introducing an all-optical wavelength converter in the network; placing a corresponding number of all-optical wavelength converters in a network node according to the principle of sparse wavelength converter placement; establishing an optical channel for the service, in which the establishing an optical channel includes the steps of: establishing an OSNR awareness route and wavelength assignment algorithm model that includes transmission loss, ASE noise and OSNR penalty; and calculating the OSNR of various routes by using the OSNR awareness route and wavelength assignment algorithm model and establishing the optical channel using the route with the highest OSNR and accomplishing wavelength assignment. The present invention can reduce the cost of all-optical wavelength conversion and the impact of the OSNR penalty on the network performance improvement.

A network switch comprises a plurality of optical physical transport layer resources and a control plane management engine capable of receiving, via a request over a network interface, at least one control plane provisioning policy that maps at least one upper layer resource to at least some of the optical physical transport layer resources. The control plane management engine provisions at least some of the optical physical transport layer resources for use by at least one virtual control plane, which operates according to rules of the control plane provisioning policy. The control plane management engine is configured to manage network traffic among the at least some optical physical transport layer resources and external networking nodes according to the at least one virtual control plane.

A service switching system and a service switching method, where the system includes at least two service processing subracks and at least one optical cross-connect subrack. Each service processing subrack is connected to each optical cross-connect subrack using an optical fiber. Each service processing subrack is configured to perform service switching for an externally inputted service data electrical signal, and then convert it into an optical signal, and send to one or more optical cross-connect subracks, or vice versa. Each optical cross-connect subrack is configured to receive a service data optical signal from one or more service processing subracks and perform optical cross-connection for the service data optical signal, and then output the service data optical signal to the one or more service processing subracks, which reduce interconnection costs of the service switching system.