Patent ID: 9231702
Filing Date: 2016-01-05
CPC Classification: G02B,H04B

Claim Text:
1. An optical processing system, the optical processing system comprising: an interface to a multi-mode fiber at a first end of the optical processing system; M first single-mode waveguides, M>2, coupled to the interface; wherein the first waveguides are arranged to carry M first optical signals, respectively; each of the M first single-mode waveguides carrying its respective first optical signal in a basic mode; N second single-mode waveguides, N>1, at a second end of the optical processing system, wherein the second waveguides are arranged to carry N second optical signals, respectively, and wherein each of the N second single-mode waveguides carries its respective second optical signal in a basic mode, and wherein the N second optical signals are associated with N modes carried by the multi-mode fiber, respectively; and an optical processing core for transforming the first optical signals into the second optical signals such that a correlation between the second optical signals is decreased compared to a correlation between the first optical signals, wherein the optical processing core comprises two or more optical processing stages in sequence, each comprising one or more optical couplers arranged for processing one or more pairs of single-mode waveguides, respectively, thereby coupling some or all of the M first optical signals with one another, such that at least one of the N second optical signals is a linear combination of the some or all of the M first optical signals.