Abstract:
An optical data transmitter includes vertical cavity surface-emitting lasers and an all-optical spatial mode multiplexer. Each vertical cavity surface-emitting laser is configured to output a data modulated optical carrier at a center wavelength of less than one micrometer. The all-optical spatial mode multiplexer has an optical output and optical inputs. Each vertical cavity surface- emitting lasers is optically connected to one or more of the optical inputs of the all-optical spatial mode multiplexer. The all-optical spatial mode multiplexer is configured to cause at least two of the vertical cavity surface-emitting lasers to excite linearly independent combinations of one or more optical spatial propagating modes of an optical fiber in response to the optical output being coupled to a near end of the optical fiber.
Abstract:
A method (10) of transmitting communications traffic, the method comprising steps of receiving a sequence of communications traffic bits (12); and mapping the sequence of communications traffic bits onto a respective one of a plurality of transmission symbols for transmission during a symbol time (14). Each transmission symbol is identified by a respective first symbol identifier indicative of a respective one or more of a plurality, M, of wavelengths for a transmission signal and a respective second symbol identifier indicative of a respective one or more of a plurality, N, of optical fibres on which to transmit the transmission signal.
Abstract:
This patent document provides optical processing and switching of optical channels based on mode-division multiplexing (MDM) and wavelength division multiplexing (WDM). In one implementation, a method is provided for processing different optical signal channels to include receiving different input optical signal channels in different optical waveguide modes and in different wavelengths; converting input optical signal channels in multimodes into single-mode optical signal channels, respectively; subsequent to the conversion, processing single-mode optical signal channels obtained from the different input optical signal channels to re-group single-mode optical signal channels into different groups of processed single-mode optical signal channels; and converting different groups of the processed single-mode optical signal channels into different groups of output optical signal channels containing one or more optical signal channels in multimodes multimode signals to direct the groups as different optical outputs.
Abstract:
L'invention concerne une méthode de sélection de modes pour un système de transmission MIMO sur une fibre optique de type multi-mode. Elle comprend une étape de mesure de la matrice de transfert du canal de transmission constitué par un ensemble des modes de la fibre optique (110), une étape de transformation (120) de la matrice de transfert en une matrice diagonale par blocs, chaque bloc étant associé à un sous-ensemble de modes, une étape de détermination (130) du gain et/ou de la capacité de transmission pour chacun des sous-ensembles de modes, et une sélection (140) du sous-ensemble de modes correspondant au gain et/ou à la capacité la plus élevé(e), le système de transmission MIMO utilisant alors seulement les modes du sous-ensemble ainsi sélectionné pour transmettre sur la fibre optique. L'invention concerne également une méthode de sélection de cœurs pour un système de transmission MIMO sur fibre optique de type multi-cœur.