Patent ID: 8532447
Filing Date: 2013-09-10
Classification: G02B

Abstract:
1. A multimode interference coupler, comprising: a first waveguide defined by a first portion having a first propagation axis; a multimode interference (MMI) portion positioned at an acute angle to said first propagation axis and having a first end optically coupled to the first waveguide, the MMI portion functioning to split a first optical signal into second and third optical signals each having a different power level according to a power ratio functionally associated with a magnitude of the acute angle; and second and third waveguides optically coupled to a second end of the MMI portion, the second and third waveguides arranged to receive the second and third optical signals, wherein the first waveguide further includes a second portion having a second propagation axis with an input facing away from the first end of the MMI portion, wherein the second propagation axis and propagation axes of the second and third waveguides of the MMI portion are substantially parallel.