Abstract:
Device for adding/dropping optical signals into/from an optical transmission path, including input means for at least two optical signals with distinct wavelengths, comprising: spectral selection means for sending at least a first signal to a first optical path and at least a second signal to a second optical path; at least a wavelength selective switching means along at least one of said first and second optical paths, for adding and dropping at least one optical signal having a predetermined wavelength selected from the optical signal wavelengths.
Abstract:
A multi-wavelength optical filtering device for optical signal transmission, capable for functioning as a multiplexer or a demultiplexer. The device has at least one (first) optical circulator having at least four ports including an input port and a plurality of sequential ports, the last of said sequential ports being an output port, and an in-fiber Bragg grating (wavelength selective means) coupled to each of said sequential ports except said output port. The circulator may be branched off to a number of other circulators, the number depending on the number of the sequential ports of the first circulator, through the Bragg grating rather than through the output port of the first circulator. The other circulators, which are preferably also at least four-port circulators with wavelength selective means at the sequential ports, can also be branched off in an analogous manner as the first circulator. The device allows a reduction of signal losses in optical signal transmission due to the passing of a signal between circulator ports.
Abstract:
L'invention concerne un transpondeur optoélectronique (113,133) pour un système de transmission radio sur fibre, comprenant : • un module (140) d'émission optique apte à moduler un premier signal radioélectrique numérique (Srn1) pour obtenir un premier signal optique (So1); • un module (150) de réception optique apte à recevoir un deuxième signal optique (So2) et à le démoduler pour obtenir un signal radioélectrique démodulé (Srd); • un module (152) de numérisation apte à numériser le signal radioélectrique démodulé (Srd) pour obtenir un deuxième signal radioélectrique numérique (Srn2); le module (140) d'émission comprenant : • un module (141) d'addition d'un premier signal de gestion (Sg1) au premier signal radioélectrique numérique (Srn1), le débit du premier signal de gestion (Sg1) étant inférieur à celui du premier signal radioélectrique numérique (Srn1); et le module (152) de numérisation optique comprenant : • un module (153) d'extraction apte à extraire un deuxième signal de gestion (Sg2) à partir du signal radioélectrique démodulé (Srd), le débit du deuxième signal de gestion (Sg2) étant inférieur à celui du deuxième signal radioélectrique numérique (Srn2).
Abstract:
A switch (10) configured to connect a plurality of remote radio units (3) with a plurality of main units (5) in a radio access network. The switch comprises a first stage (30) comprising one or more first units (18) configured to receive a signal originating from a remote radio unit, and configured to output one or more spectral component having a wavelength. The switch further comprises a central stage (40) configured to receive the one or more optical wavelength, and transfer the spectral component to an output port determined by the wavelength. The switch further comprises a second stage (50) comprising one or more second units configured to receive the one or more spectral component from the central stage and output a signal towards a main unit. The first unit (18) is configured to control the wavelength of the output spectral component such that the spectral component is transferred by the central stage to a selected one of said second units (19).
Abstract:
ROADM node systems and methods of operation are disclosed. ROADM node systems may include transponder aggregators including transponders to add signals for switching through the ROADM node. The transponder aggregators may be constrained from adding signals on adjacent channels for simultaneous use. Further, the transponder aggregators may include an optical coupler in lieu of an optical multiplexer. The ROADM system may include a set of wavelength selective switches associated with output ports that can provide an additional filtering function for the added signals prior to transmission on a WDM network.
Abstract:
L'invention concerne un dispositif d'insertion/extraction (10) d'au moins une sous-bande optique dans un canal optique (C i ) composé d'une pluralité de sous-bandes optiques, le dispositif comprenant des moyens d'extraction (13) aptes à extraire une première sous-bande optique (SB) appartenant au canal optique (C i ), des moyens de suppression (15) arrangés pour obtenir un canal optique filtré (C i *) à partir du canal optique (C i ) dans lequel au moins une deuxième sous-bande (SB") est supprimée et un moyen de couplage (17) apte à insérer une sous-bande optique de remplacement (SB) à la place de la deuxième sous-bande (SB") dans le canal optique filtré (C i *) afin d'obtenir un canal optique modifié (C i '). L'invention concerne par ailleurs un commutateur optique d'insertion/extraction (20, 30) utilisant un ou plusieurs dispositifs d'insertion/extraction (10), ainsi que les procédés d'insertion/extraction correspondants.
Abstract:
A network element (10) comprises: a first optical input section (1), a first optical output section (2), a second optical input section (3) and a second optical output section (4) a first and second insertion and extraction modules (30, 40), each of said insertion and extraction modules comprising a wavelength selection switch (31, 41), a first optical coupler (8) comprising two bidirectional branches (21, 22) respectively connected to the first selectable port of the first and second insertion and extraction modules, and a second optical coupler (11) comprising two bidirectional branches (23, 24) respectively connected to the second selectable port of the first and second insertion and extraction modules.
Abstract:
The present invention relates to an open optical access network system in which one optical access network is open to enable a plurality of service providers and a plurality of subscribers to simultaneously use the optical access network, to thereby improve the efficiency of using the optical access network, wherein each subscriber can be provided with a plurality of different services from the plurality of service providers, thereby enabling the flexible selection of services and the flexible change in services, thus improving the efficiency of using an optical infrastructure.
Abstract:
Method and system for band blocking in an optical telecommunication network. According to an embodiment, the present invention provides a system for optical network. The system includes an input that is configured to receive an input signal through a first optical input. The system also includes a band splitting module that is coupled to the input. The band splitting module is configured to separate the input signal into a plurality of bands. The plurality of bands includes a first band and a second band. The first band includes a first plurality of wave channels. The first plurality of wave channels is characterized by a first channel spacing. The second band includes a second plurality of wave channels, which is characterized by a second channel spacing.