Patent ID: 6414766
Filing Date: 2002-07-02
Classification: H04L,H04Q

Abstract:
An ATM switching matrix having n input ports, a passive optical core and n output ports each having an electronic buffer, wherein:each input port includes: an input coupled to an input of the matrix, at least p outputs, p being less than or equal to n, a tunable light source for emitting an optical signal transporting cells received at an input of the matrix, switching means for routing the optical signal emitted by said source to at least one of said p outputs of said input port, said matrix further includes tuning means for tuning said tunable light source of each input port so that its wavelength corresponds to the output of said matrix which is the destination of the cell currently being received by the input port concerned, said passive optical core includes at least p optical couplers each having 2n ports, n of which are respectively connected to an output of each of said n input ports, each output port includes: at least p optical receivers which are tuned to the same fixed wavelength which is specific to said output port, said receivers each having an input respectively connected to a port of one of said p couplers, a buffer having p inputs respectively connected to the outputs of said p receivers and an output connected to an output of said matrix, and said matrix includes distributed allocation means adapted to control said switching means of each input port to connect, to k separate couplers, k respective input ports which at the time concerned are receiving k cells addressed to the same output port, k being less than or equal to p, this operation being repeated for each output port.