[Problem] In a transmission system of a disaggregation type formed by connecting, through an optical fiber, sites each including various transmission functional devices having specifications of different vendors, wavelength resources that can be accommodated in the optical fiber can be easily grasped and managed.

[Solution] A transmission system formed by connecting sites ach including various transmission functional devices having specifications of different vendors through an optical fiber 15 stores at least unique information of the transmission functional devices for each site, connection information, and information of wavelength resources (the number of wavelengths) that can be accommodated in the optical fiber 15 in a facility DB 34 as DB information D2. In a case where the number of wavelengths of order information for requesting the number of wavelengths required for transmission of optical signals between sites is larger than the number of wavelengths that can be accommodated in the optical fiber 15 of the DB information D2, the number of wavelengths for each of the transmission functional devices required for enabling the number of wavelengths of the order information D1 to be accommodated in the optical fiber 15 is designed using the design unit 32. Furthermore, the designed numbers of wavelengths are configured in the corresponding transmission functional devices using the configuration unit 33.

A modular routing node includes a single input port and a plurality of output ports. The modular routing node is arranged to produce a plurality of different deflections and uses small adjustments to compensate for wavelength differences and alignment tolerances in an optical system. An optical device is arranged to receive a multiplex of many optical signals at different wavelengths, to separate the optical signals into at least two groups, and to process at least one of the groups adaptively.

An intelligence-defined optical tunnel network system includes pods. Each pod includes optical add-drop sub-systems. Each optical add-drop sub-system includes a first transmission module and a second transmission module. The first transmission modules of the optical add-drop sub-systems are connected to each other for forming a first transmission ring. The second transmission modules of the optical add-drop sub-systems are connected to each other for forming a second transmission ring. Each first transmission module includes a multiplexer and an optical signal amplifier. The multiplexer is connected to a Top-of-Rack switch. The multiplexer is configured to receive, through input ports, upstream optical signals from the Top-of-Rack switch, and combine the upstream optical signals into a composite optical signal. The upstream optical signals have wavelengths respectively. The optical signal amplifier, coupled to the multiplexer, is configured to amplify the composite optical signal and output an amplified composite optical signal.

Signal distribution arrangements are assembled by selecting a terminal body and a tap module combination that provides the desired signal strength at the intended position in an optical network. Each terminal body includes an input connection interface, a pass-through connection interface, a module connection interface, and multiple drop connection interfaces. Each tap module houses an optical tap having an asymmetric split ratio. Most of the optical signal power received at the signal distribution arrangement passes to the pass-through connection interface. A portion of the optical signal power is routed to the drop connection interfaces (e.g., via a symmetrical optical power splitter). The tap module and terminal body combination are selected based on the desired number of drop connection interfaces and to balance the asymmetric split ratio with the symmetric split ratio.

An intelligence-defind optical tunnel network system includes a first tier network and a second tier network. The first tier network includes multiple pods, any one of which includes multiple Optical Add-Drop Sub-systems (OADS) configured to transmit data between corresponding servers through ToR switches. The second tier network includes multiple Optical Switch Interconnect Sub-systems (OSIS). Any two of the OSISs transmit a corresponding lateral optical signal via a first line correspondingly. Any two adjacent OSISs are coupled to the OADSs in the same pod of the first tier via multiple optical paths respectively.

A node configured to operate in an optical network includes P switching planes interconnected by an SS cross-plane switch, P>1; and N.sub.i degrees per switching plane P.sub.i where i=1 to P, each degree formed by corresponding degree components having R ports, wherein a first set of ports of the R ports is for intra-plane switching, a second set of ports of the R ports is for inter-plane switching, and a third set of ports of the R ports is for in-plane add/drop. S is greater than or equal to a sum of a number of degrees across all of the P switching planes. R is greater than or equal to a sum of the first set of ports, the second set of ports, and the third set of ports.

Techniques for migrating a plurality of communications services in a data communication network are disclosed. Aspects include accessing a migration map for the plurality of communications services; identifying a communications dependency between a first service and a second service according to the migration map, the first service migrating from a first route to a second route, the second service migrating from a third route to a fourth route, and the third route at least partially overlapping with the second route; determining a migration sequence based on the communications dependency, wherein the migration sequence includes a largest subset of the plurality of communications services of which no more than M communications services are allowed to migrate from pre-migration configurations to temporary routes, before migrating to post-migration configurations; and migrating the plurality of communications services from a first plurality of configurations to a second plurality of configurations according to the migration sequence.

Techniques for migrating a plurality of communications services in a data communication network are disclosed. Aspects include accessing a migration map for the plurality of communications services; identifying a communications dependency between a first service and a second service according to the migration map, the first service migrating from a first route to a second route, the second service migrating from a third route to a fourth route, and the third route at least partially overlapping with the second route; determining a migration sequence based on the communications dependency, wherein the migration sequence includes a largest subset of the plurality of communications services of which no more than M communications services are allowed to migrate from pre-migration configurations to temporary routes, before migrating to post-migration configurations; and migrating the plurality of communications services from a first plurality of configurations to a second plurality of configurations according to the migration sequence.

The present application provides a passive aggregation-layer network device, a network system, and a working method. The passive aggregation-layer network device includes a first multiplexer/demultiplexer, a second multiplexer/demultiplexer, and an optical fiber. The first multiplexer/demultiplexer receives optical signals of optical modules of access-layer network devices connected to the first multiplexer/demultiplexer, couples the received optical signals to obtain a first coupled optical signal, and sends the first coupled optical signal to the second multiplexer/demultiplexer by using the optical fiber. The second multiplexer/demultiplexer decouples the first coupled optical signal, and transmits obtained optical signals to corresponding optical modules of core-layer network devices.

An intelligence-defined optical tunnel network system includes multiple Optical Switch Interconnect Sub-systems (OSIS). Any one of the OSIS includes a receiving sub-module, an output sub-module, an interconnection fabric module and an optical switching sub-module. The receiving module is configured to receive multiple first and third upstream optical signals from first and second Optical Add-Drop Sub-systems (OADS) corresponding to the first and the second pods. The output sub-module is configured to output multiple second and fourth downstream optical signals to the first and second OADS. The interconnect circuit sub-module is configured to connect adjacent two of the OSISs and any two of the OSISs transmit a corresponding lateral transmission optical signal via a first line correspondingly. The optical switching sub-module is configured to transmit optical signals between the receiving sub-module, the output sub-module, and the interconnection fabric module.