A photonic cross-connect arrangement is presented which is able to cope with the transmission of super-channels, wherein complete super-channels are dropped and added to change a direction of transport. At least a cyclic filter is used in a drop-branch of a cross-connect for dividing a super-channel into sub-channels and/or at least a further cyclic filter is used in an add-branch to configure a super-channel.

A network capable of being used in a datacenter is described. In some embodiments, the network can comprise a set of optical fiber rings, wherein each optical fiber ring carries data traffic on one or more wavelengths, and wherein each optical fiber ring is partitioned into multiple sectors. A reconfigurable optical add-drop multiplexer (ROADM) can be coupled to at least one optical fiber in each of at least two sectors. An electro-optical-switch can be coupled to each ROADM in each of the at least two sectors. A set of switches can be coupled to each electro-optical-switch in each of the at least two sectors. The set of switches can comprise a first layer of aggregation switches that is coupled to a second layer of edge switches, wherein the edge switches can be coupled to servers in a datacenter.

A method for downlink data transmission and related products are provided. The method includes: a terminal receives downlink control information (DCI) for scheduling multiple physical downlink shared channels (PDSCHs), wherein the DCI contains transmission configuration indicator (TCI) state indication; and the terminal determines a TCI state which is applied to each of the multiple PDSCHs according to at least one TCI state indicated by the TCI state indication.

Embodiments of the present application provide a submarine optical cable system for reducing the complexity of the submarine optical cable system. The submarine optical cable system comprises a first trunk station, a second trunk station, a branch station, first XC equipment, second OXC equipment, a trunk fiber set and a branch fiber. The trunk fiber set at least comprises a first trunk fiber and a second trunk fiber. The branch station is connected with the second trunk fiber arranged between the first OXC equipment and the second OXC equipment through the branch fiber. The first trunk station is configured for sending a first service through a first transmission channel in a first transmission channel set and sending a second service through a second transmission channel in a second transmission channel set. The first OXC equipment is configured for transferring the first transmission channel to the second trunk fiber. The branch station is configured for uploading or downloading the first service and the second service through the second trunk fiber. The second OXC equipment is configured for transferring the transferred first transmission channel to the first trunk fiber.

[Objective] To make it possible to effectively relay remaining signals even when any input failure occurs on a propagation path. [Solution] Provided is an optical branching/insertion device including: a trunk-side detection/branching unit for detecting a failure of a trunk-side optical signal inputted from the trunk side and outputting it as a first detection result, and for splitting the trunk-side optical signal and sending the split signals respectively to the trunk side and to the branch side; a branch-side detection unit for detecting a failure of a branch-side optical signal inserted from the branch side and outputting it as a second detection result, and for sending the branch-side optical signal as an insertion signal; an insertion signal adjustment unit for outputting the insertion signal with its pass-through degree having been adjusted on the basis of the first detection result, as a first adjusted signal; a trunk signal adjustment unit for outputting the trunk-side optical signal with its pass-through degree having been adjusted on the basis of the first detection result, as a second adjusted signal; and a combining/output unit for outputting, to the outside, an optical signal into which the first adjusted signal and the second adjusted signal are combined together, as a trunk-side output optical signal.

To use a plurality of wavelength bands, this seabed branching device comprises: a first demultiplexing unit that demultiplexes a wavelength multiplexed optical signal, which was input from a first terminal, into a first wavelength multiplexed optical signal and a second wavelength multiplexed optical signal; an optical add/drop unit that outputs at least a third wavelength multiplexed optical signal included in the first wavelength multiplexed optical signal to a second terminal station, and outputs at least a fifth wavelength multiplexed optical signal by multiplexing a fourth wavelength multiplexed optical signal included in the first wavelength multiplexed optical signal and a wavelength multiplexed optical signal input from the second terminal station; and a first multiplexing unit that multiplexes the second wavelength multiplexed optical signal and the fifth wavelength multiplexed optical signal, which was input from the optical add/drop unit, and outputs the result to a third terminal station.

Optical networks, nodes and methods are disclosed. To solve the aggressor issue and to reduce the cross-talk caused by the aggressors in colorless, directionless and contentionless reconfigurable optical add drop multiplexer nodes, the present disclosure configures a first broadcast module to supply only non-adjacent wavelengths to a first input port of a wavelength selective switch, and a second broadcast module to supply only non-adjacent wavelengths to a second input port of the wavelength selective switch.

In order to prevent, without significantly reducing the power of a transmission path, a signal unnecessary for a branch station from being intercepted at the branch station, a node apparatus comprises: a first optical unit that outputs a first optical signal received from a first terminal station and addressed to a second terminal station and also outputs a second optical signal received from the first terminal station and addressed to a third terminal station; and a second optical unit that receives the first and second optical signals outputted from the first optical unit, optically removes a portion of the spectrum of the first optical signal, thereby generating a fourth optical signal, and passes the second optical signal as it is, thereby transmitting the second optical signal together with the fourth optical signal to the third terminal station.

An apparatus for management of a spectral capacity of a wavelength division multiplexing, WDM, system includes at least one pair of transmission fibers provided for transporting optical signals. Each transmission fiber of a transmission fiber pair is connected to a first port of an optical circulator having at least two additional ports and adapted to transmit an incoming optical signal entering one of its ports via its next port. WDM subsystems configured with counter-propagating assignable wavelengths are connected to associated ports of the optical circulator of the apparatus.

An optical device includes: wavelength selection elements; an optical switch that switches a propagation path of input light that is from an input port such that the input light propagates to one designated wavelength selection element among the wavelength selection elements; and a separation element disposed in the propagation path of the input light between the input port and the wavelength selection elements and that separates the input light into wavelength components.