Abstract:
The invention relates to an optical spectrum inverter, configured for counteracting phase distortion effects in an optical channel over a predefined frequency range, to an inverter node, configured for duplex operation in at least two wavelength channels, and to a method for counteracting phase distortion effects in an optical channel. The optical spectrum inverter (1) comprises an optical receiver (2) comprising a polarization diversity unit (3) configured for polarization resolved detection, wherein the optical receiver (2) is configured for receiving an optical input signal comprising a first wavelength span and for converting the optical input signal to an electrical signal, and an optical modulator (8) connectable to the optical receiver (2) and configured for modulating the electrical signal onto an optical signal, wherein the optical modulator (8) comprises an optical filter (12) which is configured for selecting a second wavelength span of the optical signal corresponding to an optical output side band of an inverted spectrum of the optical channel such that phase distortion effects are counteracted at least partly over the predefined frequency range. In this way, an optical spectrum inverter is provided which is simple and cost-effective to realize and allows higher optical power levels in conjunction with a higher capacity per optical channel and is also adapted for longer transmission distances.
Abstract:
A hybrid electro-optical data center system includes multiple tiers. A bottom tier has one or more bottom tier instances, with each bottom tier instance including one or more racks, an electro-optical switch corresponding to each rack, and a first bottom tier optical loop providing optical connectivity between the electro-optical switches of the respective bottom tier instance. At least one server within each rack is electrically connected to the respective electro-optical switch and at least one super-server within each rack is electrically and optically connected to the respective electro-optical switch. A top tier includes electro-optical switches, each electrically connected to an electro-optical switch in a respective bottom tier instance, a first top tier optical loop providing optical connectivity between the electro-optical switches of the top tier, and one or more optical add/drop modules providing optical connectivity between the first bottom tier optical loop and the first top tier optical loop.
Abstract:
The present invention provides a filter block 300, 800, 1000 for an optical N-channels multiplexing/demultiplexing device 600 for receiving or emitting light, wherein the filter block 300, 800 comprises: a plurality of reflecting surfaces 301, 801-804, 1201-1206 and a plurality of N filters 302, 805-808, 1207-1212, wherein the plurality of reflecting surfaces 301, 801-804, 1201-1206 and the N filters 302, 805-808, 1207-1212 are arranged such that a light beam can be reflected between the plurality of reflecting surfaces 301, 801-804, 1201-1206 and the N filters 302, 805-808, 1207-1212, and each of said N filters 302, 805-808, 1207-1212 is transparent to a defined wavelength, wherein at least two reflecting surfaces 301, 801-804, 1201-1206 are arranged in a different plane and at least two filters 302, 805-808, 1207-1212 are arranged in a different plane. Moreover, the present invention further provides an optical wavelength division multiplexing/demultiplexing device 600, comprising such a filter block.
Abstract:
This application relates to a method of transmitting multiple data streams via multiple optical transmission units adapted for optical communication using wavelength division multiplexing. The method comprises a first encryption step of encrypting each of a plurality of data streams to obtain a respective encrypted data stream, a mapping step of mapping the plurality of encrypted data streams obtained in the first encryption step to a plurality of transmission streams for transmission via the optical transmission units, wherein the transmission streams and optical transmission units are in a one-to-one relationship, and wherein each transmission stream is mapped to by at least two of the plurality of encrypted data streams, a second encryption step of encrypting each of the plurality of transmission streams to obtain a respective encrypted transmission stream, and a transmission step of transmitting each of the plurality of encrypted transmission streams obtained in the second encryption step via a respective optical transmission unit. The application further relates to a method of receiving multiple encrypted transmission streams via multiple optical reception units adapted for optical communication using wavelength division multiplexing, to a transmission device for transmitting multiple data streams via multiple optical transmission units adapted for optical communication using wavelength division multiplexing, and a to a reception device for receiving multiple encrypted transmission streams via multiple optical reception units adapted for optical communication using wavelength division multiplexing.
Abstract:
A communications network transport node 10 comprising an optical add-drop multiplexer (OADM) 12,comprising optical signal processing apparatus 16 and electrical signal routing apparatus 18, and a packet switch 14. Each optical signal processing apparatus 16 comprises an optical input 20, an optical output 22, optical-to-electrical (O-E) signal conversion apparatus 24, arranged to receive input optical channel signals and to convert each into an input radio frequency (RF) modulated electrical channel signal,and electrical to optical(E-O) signal conversion apparatus 26, arranged to receive output RF modulated electrical channel signals and to convert each into an output optical channel signal. The electrical signal routing apparatus 18 determines which input RF modulated electrical channel signals are to be dropped, and routes these to the electrical drop outputs, and which are to be transmitted, and routes these to a selected E-O apparatus 26. The routing apparatus 18 receives further electrical channel signals and routes these to a selected E-O apparatus 26. The packet switch 14 receives the input RF modulated electrical channel signals to be dropped and delivers further RF modulated electrical channel signals to the OADM 12.