US Patent 12001057 Bidirectional filter

A bidirectional optical device includes a first optical component, wherein a portion of a first interface of the first optical component has a reflector coating, wherein a second interface of the first optical component has an optical coating, and wherein the first optical component includes an internal splitting interface disposed between the first interface and the second interface, and a second optical component including a reflector aligned to the second interface of the first optical component, wherein the first optical component and the second optical component comprise an unbalanced Mach-Zehnder (MZ) interferometer.